2 * libev event processing core, watcher management
4 * Copyright (c) 2007,2008,2009,2010,2011,2012 Marc Alexander Lehmann <libev@schmorp.de>
7 * Redistribution and use in source and binary forms, with or without modifica-
8 * tion, are permitted provided that the following conditions are met:
10 * 1. Redistributions of source code must retain the above copyright notice,
11 * this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
19 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
20 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
21 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
23 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
25 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
26 * OF THE POSSIBILITY OF SUCH DAMAGE.
28 * Alternatively, the contents of this file may be used under the terms of
29 * the GNU General Public License ("GPL") version 2 or any later version,
30 * in which case the provisions of the GPL are applicable instead of
31 * the above. If you wish to allow the use of your version of this file
32 * only under the terms of the GPL and not to allow others to use your
33 * version of this file under the BSD license, indicate your decision
34 * by deleting the provisions above and replace them with the notice
35 * and other provisions required by the GPL. If you do not delete the
36 * provisions above, a recipient may use your version of this file under
37 * either the BSD or the GPL.
40 /* this big block deduces configuration from config.h */
50 # define EV_USE_FLOOR 1
54 # if HAVE_CLOCK_SYSCALL
55 # ifndef EV_USE_CLOCK_SYSCALL
56 # define EV_USE_CLOCK_SYSCALL 1
57 # ifndef EV_USE_REALTIME
58 # define EV_USE_REALTIME 0
60 # ifndef EV_USE_MONOTONIC
61 # define EV_USE_MONOTONIC 1
64 # elif !defined EV_USE_CLOCK_SYSCALL
65 # define EV_USE_CLOCK_SYSCALL 0
68 # if HAVE_CLOCK_GETTIME
69 # ifndef EV_USE_MONOTONIC
70 # define EV_USE_MONOTONIC 1
72 # ifndef EV_USE_REALTIME
73 # define EV_USE_REALTIME 0
76 # ifndef EV_USE_MONOTONIC
77 # define EV_USE_MONOTONIC 0
79 # ifndef EV_USE_REALTIME
80 # define EV_USE_REALTIME 0
85 # ifndef EV_USE_NANOSLEEP
86 # define EV_USE_NANOSLEEP EV_FEATURE_OS
89 # undef EV_USE_NANOSLEEP
90 # define EV_USE_NANOSLEEP 0
93 # if HAVE_SELECT && HAVE_SYS_SELECT_H
94 # ifndef EV_USE_SELECT
95 # define EV_USE_SELECT EV_FEATURE_BACKENDS
99 # define EV_USE_SELECT 0
102 # if HAVE_POLL && HAVE_POLL_H
104 # define EV_USE_POLL EV_FEATURE_BACKENDS
108 # define EV_USE_POLL 0
111 # if HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
112 # ifndef EV_USE_EPOLL
113 # define EV_USE_EPOLL EV_FEATURE_BACKENDS
117 # define EV_USE_EPOLL 0
120 # if HAVE_KQUEUE && HAVE_SYS_EVENT_H
121 # ifndef EV_USE_KQUEUE
122 # define EV_USE_KQUEUE EV_FEATURE_BACKENDS
125 # undef EV_USE_KQUEUE
126 # define EV_USE_KQUEUE 0
129 # if HAVE_PORT_H && HAVE_PORT_CREATE
131 # define EV_USE_PORT EV_FEATURE_BACKENDS
135 # define EV_USE_PORT 0
138 # if HAVE_INOTIFY_INIT && HAVE_SYS_INOTIFY_H
139 # ifndef EV_USE_INOTIFY
140 # define EV_USE_INOTIFY EV_FEATURE_OS
143 # undef EV_USE_INOTIFY
144 # define EV_USE_INOTIFY 0
147 # if HAVE_SIGNALFD && HAVE_SYS_SIGNALFD_H
148 # ifndef EV_USE_SIGNALFD
149 # define EV_USE_SIGNALFD EV_FEATURE_OS
152 # undef EV_USE_SIGNALFD
153 # define EV_USE_SIGNALFD 0
157 # ifndef EV_USE_EVENTFD
158 # define EV_USE_EVENTFD EV_FEATURE_OS
161 # undef EV_USE_EVENTFD
162 # define EV_USE_EVENTFD 0
176 #include <sys/types.h>
191 # undef ECB_NO_THREADS
192 # define ECB_NO_THREADS 1
196 # define ECB_NO_SMP 1
200 # include <sys/time.h>
201 # include <sys/wait.h>
205 # define WIN32_LEAN_AND_MEAN
206 # include <winsock2.h>
207 # include <windows.h>
208 # ifndef EV_SELECT_IS_WINSOCKET
209 # define EV_SELECT_IS_WINSOCKET 1
211 # undef EV_AVOID_STDIO
214 /* OS X, in its infinite idiocy, actually HARDCODES
215 * a limit of 1024 into their select. Where people have brains,
216 * OS X engineers apparently have a vacuum. Or maybe they were
217 * ordered to have a vacuum, or they do anything for money.
218 * This might help. Or not.
220 #define _DARWIN_UNLIMITED_SELECT 1
222 /* this block tries to deduce configuration from header-defined symbols and defaults */
224 /* try to deduce the maximum number of signals on this platform */
226 /* use what's provided */
228 # define EV_NSIG (NSIG)
230 # define EV_NSIG (_NSIG)
232 # define EV_NSIG (SIGMAX+1)
233 #elif defined SIG_MAX
234 # define EV_NSIG (SIG_MAX+1)
235 #elif defined _SIG_MAX
236 # define EV_NSIG (_SIG_MAX+1)
238 # define EV_NSIG (MAXSIG+1)
239 #elif defined MAX_SIG
240 # define EV_NSIG (MAX_SIG+1)
241 #elif defined SIGARRAYSIZE
242 # define EV_NSIG (SIGARRAYSIZE) /* Assume ary[SIGARRAYSIZE] */
243 #elif defined _sys_nsig
244 # define EV_NSIG (_sys_nsig) /* Solaris 2.5 */
246 # error "unable to find value for NSIG, please report"
247 /* to make it compile regardless, just remove the above line, */
248 /* but consider reporting it, too! :) */
253 # define EV_USE_FLOOR 0
256 #ifndef EV_USE_CLOCK_SYSCALL
257 # if __linux && __GLIBC__ >= 2
258 # define EV_USE_CLOCK_SYSCALL EV_FEATURE_OS
260 # define EV_USE_CLOCK_SYSCALL 0
264 #ifndef EV_USE_MONOTONIC
265 # if defined _POSIX_MONOTONIC_CLOCK && _POSIX_MONOTONIC_CLOCK >= 0
266 # define EV_USE_MONOTONIC EV_FEATURE_OS
268 # define EV_USE_MONOTONIC 0
272 #ifndef EV_USE_REALTIME
273 # define EV_USE_REALTIME !EV_USE_CLOCK_SYSCALL
276 #ifndef EV_USE_NANOSLEEP
277 # if _POSIX_C_SOURCE >= 199309L
278 # define EV_USE_NANOSLEEP EV_FEATURE_OS
280 # define EV_USE_NANOSLEEP 0
284 #ifndef EV_USE_SELECT
285 # define EV_USE_SELECT EV_FEATURE_BACKENDS
290 # define EV_USE_POLL 0
292 # define EV_USE_POLL EV_FEATURE_BACKENDS
297 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
298 # define EV_USE_EPOLL EV_FEATURE_BACKENDS
300 # define EV_USE_EPOLL 0
304 #ifndef EV_USE_KQUEUE
305 # define EV_USE_KQUEUE 0
309 # define EV_USE_PORT 0
312 #ifndef EV_USE_INOTIFY
313 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
314 # define EV_USE_INOTIFY EV_FEATURE_OS
316 # define EV_USE_INOTIFY 0
320 #ifndef EV_PID_HASHSIZE
321 # define EV_PID_HASHSIZE EV_FEATURE_DATA ? 16 : 1
324 #ifndef EV_INOTIFY_HASHSIZE
325 # define EV_INOTIFY_HASHSIZE EV_FEATURE_DATA ? 16 : 1
328 #ifndef EV_USE_EVENTFD
329 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
330 # define EV_USE_EVENTFD EV_FEATURE_OS
332 # define EV_USE_EVENTFD 0
336 #ifndef EV_USE_SIGNALFD
337 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
338 # define EV_USE_SIGNALFD EV_FEATURE_OS
340 # define EV_USE_SIGNALFD 0
344 #if 0 /* debugging */
346 # define EV_USE_4HEAP 1
347 # define EV_HEAP_CACHE_AT 1
351 # define EV_VERIFY (EV_FEATURE_API ? 1 : 0)
355 # define EV_USE_4HEAP EV_FEATURE_DATA
358 #ifndef EV_HEAP_CACHE_AT
359 # define EV_HEAP_CACHE_AT EV_FEATURE_DATA
362 /* on linux, we can use a (slow) syscall to avoid a dependency on pthread, */
363 /* which makes programs even slower. might work on other unices, too. */
364 #if EV_USE_CLOCK_SYSCALL
365 # include <sys/syscall.h>
366 # ifdef SYS_clock_gettime
367 # define clock_gettime(id, ts) syscall (SYS_clock_gettime, (id), (ts))
368 # undef EV_USE_MONOTONIC
369 # define EV_USE_MONOTONIC 1
371 # undef EV_USE_CLOCK_SYSCALL
372 # define EV_USE_CLOCK_SYSCALL 0
376 /* this block fixes any misconfiguration where we know we run into trouble otherwise */
379 /* AIX has a completely broken poll.h header */
381 # define EV_USE_POLL 0
384 #ifndef CLOCK_MONOTONIC
385 # undef EV_USE_MONOTONIC
386 # define EV_USE_MONOTONIC 0
389 #ifndef CLOCK_REALTIME
390 # undef EV_USE_REALTIME
391 # define EV_USE_REALTIME 0
395 # undef EV_USE_INOTIFY
396 # define EV_USE_INOTIFY 0
399 #if !EV_USE_NANOSLEEP
400 /* hp-ux has it in sys/time.h, which we unconditionally include above */
401 # if !defined _WIN32 && !defined __hpux
402 # include <sys/select.h>
407 # include <sys/statfs.h>
408 # include <sys/inotify.h>
409 /* some very old inotify.h headers don't have IN_DONT_FOLLOW */
410 # ifndef IN_DONT_FOLLOW
411 # undef EV_USE_INOTIFY
412 # define EV_USE_INOTIFY 0
417 /* our minimum requirement is glibc 2.7 which has the stub, but not the header */
419 # ifndef EFD_NONBLOCK
420 # define EFD_NONBLOCK O_NONBLOCK
424 # define EFD_CLOEXEC O_CLOEXEC
426 # define EFD_CLOEXEC 02000000
429 EV_CPP(extern "C") int (eventfd) (unsigned int initval, int flags);
433 /* our minimum requirement is glibc 2.7 which has the stub, but not the header */
435 # ifndef SFD_NONBLOCK
436 # define SFD_NONBLOCK O_NONBLOCK
440 # define SFD_CLOEXEC O_CLOEXEC
442 # define SFD_CLOEXEC 02000000
445 EV_CPP (extern "C") int signalfd (int fd, const sigset_t *mask, int flags);
447 struct signalfd_siginfo
450 char pad[128 - sizeof (uint32_t)];
457 # define EV_FREQUENT_CHECK ev_verify (EV_A)
459 # define EV_FREQUENT_CHECK do { } while (0)
463 * This is used to work around floating point rounding problems.
464 * This value is good at least till the year 4000.
466 #define MIN_INTERVAL 0.0001220703125 /* 1/2**13, good till 4000 */
467 /*#define MIN_INTERVAL 0.00000095367431640625 /* 1/2**20, good till 2200 */
469 #define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
470 #define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
472 #define EV_TV_SET(tv,t) do { tv.tv_sec = (long)t; tv.tv_usec = (long)((t - tv.tv_sec) * 1e6); } while (0)
473 #define EV_TS_SET(ts,t) do { ts.tv_sec = (long)t; ts.tv_nsec = (long)((t - ts.tv_sec) * 1e9); } while (0)
475 /* the following is ecb.h embedded into libev - use update_ev_c to update from an external copy */
478 * libecb - http://software.schmorp.de/pkg/libecb
480 * Copyright (©) 2009-2012 Marc Alexander Lehmann <libecb@schmorp.de>
481 * Copyright (©) 2011 Emanuele Giaquinta
482 * All rights reserved.
484 * Redistribution and use in source and binary forms, with or without modifica-
485 * tion, are permitted provided that the following conditions are met:
487 * 1. Redistributions of source code must retain the above copyright notice,
488 * this list of conditions and the following disclaimer.
490 * 2. Redistributions in binary form must reproduce the above copyright
491 * notice, this list of conditions and the following disclaimer in the
492 * documentation and/or other materials provided with the distribution.
494 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
495 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
496 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
497 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
498 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
499 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
500 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
501 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
502 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
503 * OF THE POSSIBILITY OF SUCH DAMAGE.
509 /* 16 bits major, 16 bits minor */
510 #define ECB_VERSION 0x00010001
513 typedef signed char int8_t;
514 typedef unsigned char uint8_t;
515 typedef signed short int16_t;
516 typedef unsigned short uint16_t;
517 typedef signed int int32_t;
518 typedef unsigned int uint32_t;
520 typedef signed long long int64_t;
521 typedef unsigned long long uint64_t;
522 #else /* _MSC_VER || __BORLANDC__ */
523 typedef signed __int64 int64_t;
524 typedef unsigned __int64 uint64_t;
527 #define ECB_PTRSIZE 8
528 typedef uint64_t uintptr_t;
529 typedef int64_t intptr_t;
531 #define ECB_PTRSIZE 4
532 typedef uint32_t uintptr_t;
533 typedef int32_t intptr_t;
535 typedef intptr_t ptrdiff_t;
537 #include <inttypes.h>
538 #if UINTMAX_MAX > 0xffffffffU
539 #define ECB_PTRSIZE 8
541 #define ECB_PTRSIZE 4
545 /* many compilers define _GNUC_ to some versions but then only implement
546 * what their idiot authors think are the "more important" extensions,
547 * causing enormous grief in return for some better fake benchmark numbers.
549 * we try to detect these and simply assume they are not gcc - if they have
550 * an issue with that they should have done it right in the first place.
552 #ifndef ECB_GCC_VERSION
553 #if !defined __GNUC_MINOR__ || defined __INTEL_COMPILER || defined __SUNPRO_C || defined __SUNPRO_CC || defined __llvm__ || defined __clang__
554 #define ECB_GCC_VERSION(major,minor) 0
556 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
560 #define ECB_C (__STDC__+0) /* this assumes that __STDC__ is either empty or a number */
561 #define ECB_C99 (__STDC_VERSION__ >= 199901L)
562 #define ECB_C11 (__STDC_VERSION__ >= 201112L)
563 #define ECB_CPP (__cplusplus+0)
564 #define ECB_CPP98 (__cplusplus >= 199711L)
565 #define ECB_CPP11 (__cplusplus >= 201103L)
567 /*****************************************************************************/
569 /* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
570 /* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
573 # define ECB_NO_SMP 1
577 #define ECB_MEMORY_FENCE do { } while (0)
580 #ifndef ECB_MEMORY_FENCE
581 #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
582 #if __i386 || __i386__
583 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
584 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
585 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
586 #elif __amd64 || __amd64__ || __x86_64 || __x86_64__
587 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
588 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
589 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
590 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
591 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
592 #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \
593 || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__
594 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
595 #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \
596 || defined __ARM_ARCH_7M__ || defined __ARM_ARCH_7R__
597 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
598 #elif __sparc || __sparc__
599 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory")
600 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
601 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
602 #elif defined __s390__ || defined __s390x__
603 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
604 #elif defined __mips__
605 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
606 #elif defined __alpha__
607 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
608 #elif defined __hppa__
609 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
610 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
611 #elif defined __ia64__
612 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory")
617 #ifndef ECB_MEMORY_FENCE
618 #if ECB_GCC_VERSION(4,7)
619 /* see comment below about the C11 memory model. in short - avoid */
620 #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
621 #elif defined __clang && __has_feature (cxx_atomic)
623 #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
624 #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
625 #define ECB_MEMORY_FENCE __sync_synchronize ()
626 /*#define ECB_MEMORY_FENCE_ACQUIRE ({ char dummy = 0; __sync_lock_test_and_set (&dummy, 1); }) */
627 /*#define ECB_MEMORY_FENCE_RELEASE ({ char dummy = 1; __sync_lock_release (&dummy ); }) */
628 #elif _MSC_VER >= 1400 /* VC++ 2005 */
629 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
630 #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
631 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
632 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
635 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
636 #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
637 #include <mbarrier.h>
638 #define ECB_MEMORY_FENCE __machine_rw_barrier ()
639 #define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier ()
640 #define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier ()
642 #define ECB_MEMORY_FENCE __sync ()
646 #ifndef ECB_MEMORY_FENCE
647 #if ECB_C11 && !defined __STDC_NO_ATOMICS__
648 /* we assume that these memory fences work on all variables/all memory accesses, */
649 /* not just C11 atomics and atomic accesses */
650 #include <stdatomic.h>
651 /* unfortunately, the C11 memory model seems to be very limited, and unable to express */
652 /* simple barrier semantics. That means we need to take out thor's hammer. */
653 #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)
658 #ifndef ECB_MEMORY_FENCE
659 #if !ECB_AVOID_PTHREADS
661 * if you get undefined symbol references to pthread_mutex_lock,
662 * or failure to find pthread.h, then you should implement
663 * the ECB_MEMORY_FENCE operations for your cpu/compiler
664 * OR provide pthread.h and link against the posix thread library
668 #define ECB_NEEDS_PTHREADS 1
669 #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
671 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
672 #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
676 #if !defined ECB_MEMORY_FENCE_ACQUIRE && defined ECB_MEMORY_FENCE
677 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
680 #if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE
681 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
684 /*****************************************************************************/
687 #define ecb_inline static inline
688 #elif ECB_GCC_VERSION(2,5)
689 #define ecb_inline static __inline__
691 #define ecb_inline static inline
693 #define ecb_inline static
696 #if ECB_GCC_VERSION(3,3)
697 #define ecb_restrict __restrict__
699 #define ecb_restrict restrict
704 typedef int ecb_bool;
706 #define ECB_CONCAT_(a, b) a ## b
707 #define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
708 #define ECB_STRINGIFY_(a) # a
709 #define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
711 #define ecb_function_ ecb_inline
713 #if ECB_GCC_VERSION(3,1)
714 #define ecb_attribute(attrlist) __attribute__(attrlist)
715 #define ecb_is_constant(expr) __builtin_constant_p (expr)
716 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
717 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
719 #define ecb_attribute(attrlist)
720 #define ecb_is_constant(expr) 0
721 #define ecb_expect(expr,value) (expr)
722 #define ecb_prefetch(addr,rw,locality)
725 /* no emulation for ecb_decltype */
726 #if ECB_GCC_VERSION(4,5)
727 #define ecb_decltype(x) __decltype(x)
728 #elif ECB_GCC_VERSION(3,0)
729 #define ecb_decltype(x) __typeof(x)
732 #define ecb_noinline ecb_attribute ((__noinline__))
733 #define ecb_unused ecb_attribute ((__unused__))
734 #define ecb_const ecb_attribute ((__const__))
735 #define ecb_pure ecb_attribute ((__pure__))
738 #define ecb_noreturn _Noreturn
740 #define ecb_noreturn ecb_attribute ((__noreturn__))
743 #if ECB_GCC_VERSION(4,3)
744 #define ecb_artificial ecb_attribute ((__artificial__))
745 #define ecb_hot ecb_attribute ((__hot__))
746 #define ecb_cold ecb_attribute ((__cold__))
748 #define ecb_artificial
753 /* put around conditional expressions if you are very sure that the */
754 /* expression is mostly true or mostly false. note that these return */
755 /* booleans, not the expression. */
756 #define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
757 #define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
758 /* for compatibility to the rest of the world */
759 #define ecb_likely(expr) ecb_expect_true (expr)
760 #define ecb_unlikely(expr) ecb_expect_false (expr)
762 /* count trailing zero bits and count # of one bits */
763 #if ECB_GCC_VERSION(3,4)
764 /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
765 #define ecb_ld32(x) (__builtin_clz (x) ^ 31)
766 #define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
767 #define ecb_ctz32(x) __builtin_ctz (x)
768 #define ecb_ctz64(x) __builtin_ctzll (x)
769 #define ecb_popcount32(x) __builtin_popcount (x)
772 ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const;
774 ecb_ctz32 (uint32_t x)
778 x &= ~x + 1; /* this isolates the lowest bit */
780 #if ECB_branchless_on_i386
781 r += !!(x & 0xaaaaaaaa) << 0;
782 r += !!(x & 0xcccccccc) << 1;
783 r += !!(x & 0xf0f0f0f0) << 2;
784 r += !!(x & 0xff00ff00) << 3;
785 r += !!(x & 0xffff0000) << 4;
787 if (x & 0xaaaaaaaa) r += 1;
788 if (x & 0xcccccccc) r += 2;
789 if (x & 0xf0f0f0f0) r += 4;
790 if (x & 0xff00ff00) r += 8;
791 if (x & 0xffff0000) r += 16;
797 ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const;
799 ecb_ctz64 (uint64_t x)
801 int shift = x & 0xffffffffU ? 0 : 32;
802 return ecb_ctz32 (x >> shift) + shift;
805 ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const;
807 ecb_popcount32 (uint32_t x)
809 x -= (x >> 1) & 0x55555555;
810 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
811 x = ((x >> 4) + x) & 0x0f0f0f0f;
817 ecb_function_ int ecb_ld32 (uint32_t x) ecb_const;
818 ecb_function_ int ecb_ld32 (uint32_t x)
822 if (x >> 16) { x >>= 16; r += 16; }
823 if (x >> 8) { x >>= 8; r += 8; }
824 if (x >> 4) { x >>= 4; r += 4; }
825 if (x >> 2) { x >>= 2; r += 2; }
826 if (x >> 1) { r += 1; }
831 ecb_function_ int ecb_ld64 (uint64_t x) ecb_const;
832 ecb_function_ int ecb_ld64 (uint64_t x)
836 if (x >> 32) { x >>= 32; r += 32; }
838 return r + ecb_ld32 (x);
842 ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) ecb_const;
843 ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); }
844 ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) ecb_const;
845 ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); }
847 ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const;
848 ecb_function_ uint8_t ecb_bitrev8 (uint8_t x)
850 return ( (x * 0x0802U & 0x22110U)
851 | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
854 ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) ecb_const;
855 ecb_function_ uint16_t ecb_bitrev16 (uint16_t x)
857 x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1);
858 x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2);
859 x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4);
860 x = ( x >> 8 ) | ( x << 8);
865 ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) ecb_const;
866 ecb_function_ uint32_t ecb_bitrev32 (uint32_t x)
868 x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1);
869 x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2);
870 x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4);
871 x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8);
872 x = ( x >> 16 ) | ( x << 16);
877 /* popcount64 is only available on 64 bit cpus as gcc builtin */
878 /* so for this version we are lazy */
879 ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;
881 ecb_popcount64 (uint64_t x)
883 return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
886 ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const;
887 ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const;
888 ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const;
889 ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const;
890 ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
891 ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
892 ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const;
893 ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const;
895 ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }
896 ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }
897 ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }
898 ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }
899 ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
900 ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
901 ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
902 ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }
904 #if ECB_GCC_VERSION(4,3)
905 #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
906 #define ecb_bswap32(x) __builtin_bswap32 (x)
907 #define ecb_bswap64(x) __builtin_bswap64 (x)
909 ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const;
910 ecb_function_ uint16_t
911 ecb_bswap16 (uint16_t x)
913 return ecb_rotl16 (x, 8);
916 ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const;
917 ecb_function_ uint32_t
918 ecb_bswap32 (uint32_t x)
920 return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
923 ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const;
924 ecb_function_ uint64_t
925 ecb_bswap64 (uint64_t x)
927 return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
931 #if ECB_GCC_VERSION(4,5)
932 #define ecb_unreachable() __builtin_unreachable ()
934 /* this seems to work fine, but gcc always emits a warning for it :/ */
935 ecb_inline void ecb_unreachable (void) ecb_noreturn;
936 ecb_inline void ecb_unreachable (void) { }
939 /* try to tell the compiler that some condition is definitely true */
940 #define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
942 ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const;
943 ecb_inline unsigned char
944 ecb_byteorder_helper (void)
946 const uint32_t u = 0x11223344;
947 return *(unsigned char *)&u;
950 ecb_inline ecb_bool ecb_big_endian (void) ecb_const;
951 ecb_inline ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
952 ecb_inline ecb_bool ecb_little_endian (void) ecb_const;
953 ecb_inline ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
955 #if ECB_GCC_VERSION(3,0) || ECB_C99
956 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
958 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
963 static inline T ecb_div_rd (T val, T div)
965 return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
968 static inline T ecb_div_ru (T val, T div)
970 return val < 0 ? - ((-val ) / div) : (val + div - 1) / div;
973 #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
974 #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
977 #if ecb_cplusplus_does_not_suck
978 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
979 template<typename T, int N>
980 static inline int ecb_array_length (const T (&arr)[N])
985 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
992 #if ECB_MEMORY_FENCE_NEEDS_PTHREADS
993 /* if your architecture doesn't need memory fences, e.g. because it is
994 * single-cpu/core, or if you use libev in a project that doesn't use libev
995 * from multiple threads, then you can define ECB_AVOID_PTHREADS when compiling
996 * libev, in which cases the memory fences become nops.
997 * alternatively, you can remove this #error and link against libpthread,
998 * which will then provide the memory fences.
1000 # error "memory fences not defined for your architecture, please report"
1003 #ifndef ECB_MEMORY_FENCE
1004 # define ECB_MEMORY_FENCE do { } while (0)
1005 # define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
1006 # define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
1009 #define expect_false(cond) ecb_expect_false (cond)
1010 #define expect_true(cond) ecb_expect_true (cond)
1011 #define noinline ecb_noinline
1013 #define inline_size ecb_inline
1016 # define inline_speed ecb_inline
1018 # define inline_speed static noinline
1021 #define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
1023 #if EV_MINPRI == EV_MAXPRI
1024 # define ABSPRI(w) (((W)w), 0)
1026 # define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
1029 #define EMPTY /* required for microsofts broken pseudo-c compiler */
1030 #define EMPTY2(a,b) /* used to suppress some warnings */
1032 typedef ev_watcher *W;
1033 typedef ev_watcher_list *WL;
1034 typedef ev_watcher_time *WT;
1036 #define ev_active(w) ((W)(w))->active
1037 #define ev_at(w) ((WT)(w))->at
1040 /* sig_atomic_t is used to avoid per-thread variables or locking but still */
1041 /* giving it a reasonably high chance of working on typical architectures */
1042 static EV_ATOMIC_T have_realtime; /* did clock_gettime (CLOCK_REALTIME) work? */
1045 #if EV_USE_MONOTONIC
1046 static EV_ATOMIC_T have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
1049 #ifndef EV_FD_TO_WIN32_HANDLE
1050 # define EV_FD_TO_WIN32_HANDLE(fd) _get_osfhandle (fd)
1052 #ifndef EV_WIN32_HANDLE_TO_FD
1053 # define EV_WIN32_HANDLE_TO_FD(handle) _open_osfhandle (handle, 0)
1055 #ifndef EV_WIN32_CLOSE_FD
1056 # define EV_WIN32_CLOSE_FD(fd) close (fd)
1060 # include "ev_win32.c"
1063 /*****************************************************************************/
1065 /* define a suitable floor function (only used by periodics atm) */
1069 # define ev_floor(v) floor (v)
1074 /* a floor() replacement function, should be independent of ev_tstamp type */
1075 static ev_tstamp noinline
1076 ev_floor (ev_tstamp v)
1078 /* the choice of shift factor is not terribly important */
1079 #if FLT_RADIX != 2 /* assume FLT_RADIX == 10 */
1080 const ev_tstamp shift = sizeof (unsigned long) >= 8 ? 10000000000000000000. : 1000000000.;
1082 const ev_tstamp shift = sizeof (unsigned long) >= 8 ? 18446744073709551616. : 4294967296.;
1085 /* argument too large for an unsigned long? */
1086 if (expect_false (v >= shift))
1091 return v; /* very large number */
1093 f = shift * ev_floor (v * (1. / shift));
1094 return f + ev_floor (v - f);
1097 /* special treatment for negative args? */
1098 if (expect_false (v < 0.))
1100 ev_tstamp f = -ev_floor (-v);
1102 return f - (f == v ? 0 : 1);
1105 /* fits into an unsigned long */
1106 return (unsigned long)v;
1111 /*****************************************************************************/
1114 # include <sys/utsname.h>
1117 static unsigned int noinline ecb_cold
1118 ev_linux_version (void)
1124 char *p = buf.release;
1129 for (i = 3+1; --i; )
1135 if (*p >= '0' && *p <= '9')
1136 c = c * 10 + *p++ - '0';
1153 /*****************************************************************************/
1156 static void noinline ecb_cold
1157 ev_printerr (const char *msg)
1159 write (STDERR_FILENO, msg, strlen (msg));
1163 static void (*syserr_cb)(const char *msg) EV_THROW;
1166 ev_set_syserr_cb (void (*cb)(const char *msg) EV_THROW) EV_THROW
1171 static void noinline ecb_cold
1172 ev_syserr (const char *msg)
1175 msg = "(libev) system error";
1184 ev_printerr (strerror (errno));
1194 ev_realloc_emul (void *ptr, long size) EV_THROW
1197 return realloc (ptr, size);
1199 /* some systems, notably openbsd and darwin, fail to properly
1200 * implement realloc (x, 0) (as required by both ansi c-89 and
1201 * the single unix specification, so work around them here.
1205 return realloc (ptr, size);
1212 static void *(*alloc)(void *ptr, long size) EV_THROW = ev_realloc_emul;
1215 ev_set_allocator (void *(*cb)(void *ptr, long size) EV_THROW) EV_THROW
1221 ev_realloc (void *ptr, long size)
1223 ptr = alloc (ptr, size);
1228 ev_printerr ("(libev) memory allocation failed, aborting.\n");
1230 fprintf (stderr, "(libev) cannot allocate %ld bytes, aborting.", size);
1238 #define ev_malloc(size) ev_realloc (0, (size))
1239 #define ev_free(ptr) ev_realloc ((ptr), 0)
1241 /*****************************************************************************/
1243 /* set in reify when reification needed */
1244 #define EV_ANFD_REIFY 1
1246 /* file descriptor info structure */
1250 unsigned char events; /* the events watched for */
1251 unsigned char reify; /* flag set when this ANFD needs reification (EV_ANFD_REIFY, EV__IOFDSET) */
1252 unsigned char emask; /* the epoll backend stores the actual kernel mask in here */
1253 unsigned char unused;
1255 unsigned int egen; /* generation counter to counter epoll bugs */
1257 #if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
1265 /* stores the pending event set for a given watcher */
1269 int events; /* the pending event set for the given watcher */
1273 /* hash table entry per inotify-id */
1281 #if EV_HEAP_CACHE_AT
1282 /* a heap element */
1288 #define ANHE_w(he) (he).w /* access watcher, read-write */
1289 #define ANHE_at(he) (he).at /* access cached at, read-only */
1290 #define ANHE_at_cache(he) (he).at = (he).w->at /* update at from watcher */
1292 /* a heap element */
1295 #define ANHE_w(he) (he)
1296 #define ANHE_at(he) (he)->at
1297 #define ANHE_at_cache(he)
1304 ev_tstamp ev_rt_now;
1305 #define ev_rt_now ((loop)->ev_rt_now)
1306 #define VAR(name,decl) decl;
1307 #include "ev_vars.h"
1310 #include "ev_wrap.h"
1312 static struct ev_loop default_loop_struct;
1313 EV_API_DECL struct ev_loop *ev_default_loop_ptr = 0; /* needs to be initialised to make it a definition despite extern */
1317 EV_API_DECL ev_tstamp ev_rt_now = 0; /* needs to be initialised to make it a definition despite extern */
1318 #define VAR(name,decl) static decl;
1319 #include "ev_vars.h"
1322 static int ev_default_loop_ptr;
1327 # define EV_RELEASE_CB if (expect_false (release_cb)) release_cb (EV_A)
1328 # define EV_ACQUIRE_CB if (expect_false (acquire_cb)) acquire_cb (EV_A)
1329 # define EV_INVOKE_PENDING invoke_cb (EV_A)
1331 # define EV_RELEASE_CB (void)0
1332 # define EV_ACQUIRE_CB (void)0
1333 # define EV_INVOKE_PENDING ev_invoke_pending (EV_A)
1336 #define EVBREAK_RECURSE 0x80
1338 /*****************************************************************************/
1340 #ifndef EV_HAVE_EV_TIME
1342 ev_time (void) EV_THROW
1345 if (expect_true (have_realtime))
1348 clock_gettime (CLOCK_REALTIME, &ts);
1349 return ts.tv_sec + ts.tv_nsec * 1e-9;
1354 gettimeofday (&tv, 0);
1355 return tv.tv_sec + tv.tv_usec * 1e-6;
1359 inline_size ev_tstamp
1362 #if EV_USE_MONOTONIC
1363 if (expect_true (have_monotonic))
1366 clock_gettime (CLOCK_MONOTONIC, &ts);
1367 return ts.tv_sec + ts.tv_nsec * 1e-9;
1376 ev_now (EV_P) EV_THROW
1383 ev_sleep (ev_tstamp delay) EV_THROW
1387 #if EV_USE_NANOSLEEP
1390 EV_TS_SET (ts, delay);
1392 #elif defined _WIN32
1393 Sleep ((unsigned long)(delay * 1e3));
1397 /* here we rely on sys/time.h + sys/types.h + unistd.h providing select */
1398 /* something not guaranteed by newer posix versions, but guaranteed */
1400 EV_TV_SET (tv, delay);
1401 select (0, 0, 0, 0, &tv);
1406 /*****************************************************************************/
1408 #define MALLOC_ROUND 4096 /* prefer to allocate in chunks of this size, must be 2**n and >> 4 longs */
1410 /* find a suitable new size for the given array, */
1411 /* hopefully by rounding to a nice-to-malloc size */
1413 array_nextsize (int elem, int cur, int cnt)
1421 /* if size is large, round to MALLOC_ROUND - 4 * longs to accommodate malloc overhead */
1422 if (elem * ncur > MALLOC_ROUND - sizeof (void *) * 4)
1425 ncur = (ncur + elem + (MALLOC_ROUND - 1) + sizeof (void *) * 4) & ~(MALLOC_ROUND - 1);
1426 ncur = ncur - sizeof (void *) * 4;
1433 static void * noinline ecb_cold
1434 array_realloc (int elem, void *base, int *cur, int cnt)
1436 *cur = array_nextsize (elem, *cur, cnt);
1437 return ev_realloc (base, elem * *cur);
1440 #define array_init_zero(base,count) \
1441 memset ((void *)(base), 0, sizeof (*(base)) * (count))
1443 #define array_needsize(type,base,cur,cnt,init) \
1444 if (expect_false ((cnt) > (cur))) \
1446 int ecb_unused ocur_ = (cur); \
1447 (base) = (type *)array_realloc \
1448 (sizeof (type), (base), &(cur), (cnt)); \
1449 init ((base) + (ocur_), (cur) - ocur_); \
1453 #define array_slim(type,stem) \
1454 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
1456 stem ## max = array_roundsize (stem ## cnt >> 1); \
1457 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
1458 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
1462 #define array_free(stem, idx) \
1463 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0; stem ## s idx = 0
1465 /*****************************************************************************/
1467 /* dummy callback for pending events */
1468 static void noinline
1469 pendingcb (EV_P_ ev_prepare *w, int revents)
1474 ev_feed_event (EV_P_ void *w, int revents) EV_THROW
1477 int pri = ABSPRI (w_);
1479 if (expect_false (w_->pending))
1480 pendings [pri][w_->pending - 1].events |= revents;
1483 w_->pending = ++pendingcnt [pri];
1484 array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
1485 pendings [pri][w_->pending - 1].w = w_;
1486 pendings [pri][w_->pending - 1].events = revents;
1489 pendingpri = NUMPRI - 1;
1493 feed_reverse (EV_P_ W w)
1495 array_needsize (W, rfeeds, rfeedmax, rfeedcnt + 1, EMPTY2);
1496 rfeeds [rfeedcnt++] = w;
1500 feed_reverse_done (EV_P_ int revents)
1503 ev_feed_event (EV_A_ rfeeds [--rfeedcnt], revents);
1508 queue_events (EV_P_ W *events, int eventcnt, int type)
1512 for (i = 0; i < eventcnt; ++i)
1513 ev_feed_event (EV_A_ events [i], type);
1516 /*****************************************************************************/
1519 fd_event_nocheck (EV_P_ int fd, int revents)
1521 ANFD *anfd = anfds + fd;
1524 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
1526 int ev = w->events & revents;
1529 ev_feed_event (EV_A_ (W)w, ev);
1533 /* do not submit kernel events for fds that have reify set */
1534 /* because that means they changed while we were polling for new events */
1536 fd_event (EV_P_ int fd, int revents)
1538 ANFD *anfd = anfds + fd;
1540 if (expect_true (!anfd->reify))
1541 fd_event_nocheck (EV_A_ fd, revents);
1545 ev_feed_fd_event (EV_P_ int fd, int revents) EV_THROW
1547 if (fd >= 0 && fd < anfdmax)
1548 fd_event_nocheck (EV_A_ fd, revents);
1551 /* make sure the external fd watch events are in-sync */
1552 /* with the kernel/libev internal state */
1558 #if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
1559 for (i = 0; i < fdchangecnt; ++i)
1561 int fd = fdchanges [i];
1562 ANFD *anfd = anfds + fd;
1564 if (anfd->reify & EV__IOFDSET && anfd->head)
1566 SOCKET handle = EV_FD_TO_WIN32_HANDLE (fd);
1568 if (handle != anfd->handle)
1572 assert (("libev: only socket fds supported in this configuration", ioctlsocket (handle, FIONREAD, &arg) == 0));
1574 /* handle changed, but fd didn't - we need to do it in two steps */
1575 backend_modify (EV_A_ fd, anfd->events, 0);
1577 anfd->handle = handle;
1583 for (i = 0; i < fdchangecnt; ++i)
1585 int fd = fdchanges [i];
1586 ANFD *anfd = anfds + fd;
1589 unsigned char o_events = anfd->events;
1590 unsigned char o_reify = anfd->reify;
1594 /*if (expect_true (o_reify & EV_ANFD_REIFY)) probably a deoptimisation */
1598 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
1599 anfd->events |= (unsigned char)w->events;
1601 if (o_events != anfd->events)
1602 o_reify = EV__IOFDSET; /* actually |= */
1605 if (o_reify & EV__IOFDSET)
1606 backend_modify (EV_A_ fd, o_events, anfd->events);
1612 /* something about the given fd changed */
1614 fd_change (EV_P_ int fd, int flags)
1616 unsigned char reify = anfds [fd].reify;
1617 anfds [fd].reify |= flags;
1619 if (expect_true (!reify))
1622 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
1623 fdchanges [fdchangecnt - 1] = fd;
1627 /* the given fd is invalid/unusable, so make sure it doesn't hurt us anymore */
1628 inline_speed void ecb_cold
1629 fd_kill (EV_P_ int fd)
1633 while ((w = (ev_io *)anfds [fd].head))
1635 ev_io_stop (EV_A_ w);
1636 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
1640 /* check whether the given fd is actually valid, for error recovery */
1641 inline_size int ecb_cold
1645 return EV_FD_TO_WIN32_HANDLE (fd) != -1;
1647 return fcntl (fd, F_GETFD) != -1;
1651 /* called on EBADF to verify fds */
1652 static void noinline ecb_cold
1657 for (fd = 0; fd < anfdmax; ++fd)
1658 if (anfds [fd].events)
1659 if (!fd_valid (fd) && errno == EBADF)
1663 /* called on ENOMEM in select/poll to kill some fds and retry */
1664 static void noinline ecb_cold
1669 for (fd = anfdmax; fd--; )
1670 if (anfds [fd].events)
1677 /* usually called after fork if backend needs to re-arm all fds from scratch */
1678 static void noinline
1683 for (fd = 0; fd < anfdmax; ++fd)
1684 if (anfds [fd].events)
1686 anfds [fd].events = 0;
1687 anfds [fd].emask = 0;
1688 fd_change (EV_A_ fd, EV__IOFDSET | EV_ANFD_REIFY);
1692 /* used to prepare libev internal fd's */
1693 /* this is not fork-safe */
1698 unsigned long arg = 1;
1699 ioctlsocket (EV_FD_TO_WIN32_HANDLE (fd), FIONBIO, &arg);
1701 fcntl (fd, F_SETFD, FD_CLOEXEC);
1702 fcntl (fd, F_SETFL, O_NONBLOCK);
1706 /*****************************************************************************/
1709 * the heap functions want a real array index. array index 0 is guaranteed to not
1710 * be in-use at any time. the first heap entry is at array [HEAP0]. DHEAP gives
1711 * the branching factor of the d-tree.
1715 * at the moment we allow libev the luxury of two heaps,
1716 * a small-code-size 2-heap one and a ~1.5kb larger 4-heap
1717 * which is more cache-efficient.
1718 * the difference is about 5% with 50000+ watchers.
1723 #define HEAP0 (DHEAP - 1) /* index of first element in heap */
1724 #define HPARENT(k) ((((k) - HEAP0 - 1) / DHEAP) + HEAP0)
1725 #define UPHEAP_DONE(p,k) ((p) == (k))
1727 /* away from the root */
1729 downheap (ANHE *heap, int N, int k)
1732 ANHE *E = heap + N + HEAP0;
1738 ANHE *pos = heap + DHEAP * (k - HEAP0) + HEAP0 + 1;
1740 /* find minimum child */
1741 if (expect_true (pos + DHEAP - 1 < E))
1743 /* fast path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1744 if ( ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1745 if ( ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1746 if ( ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1750 /* slow path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1751 if (pos + 1 < E && ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1752 if (pos + 2 < E && ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1753 if (pos + 3 < E && ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1758 if (ANHE_at (he) <= minat)
1762 ev_active (ANHE_w (*minpos)) = k;
1768 ev_active (ANHE_w (he)) = k;
1774 #define HPARENT(k) ((k) >> 1)
1775 #define UPHEAP_DONE(p,k) (!(p))
1777 /* away from the root */
1779 downheap (ANHE *heap, int N, int k)
1790 c += c + 1 < N + HEAP0 && ANHE_at (heap [c]) > ANHE_at (heap [c + 1])
1793 if (ANHE_at (he) <= ANHE_at (heap [c]))
1796 heap [k] = heap [c];
1797 ev_active (ANHE_w (heap [k])) = k;
1803 ev_active (ANHE_w (he)) = k;
1807 /* towards the root */
1809 upheap (ANHE *heap, int k)
1815 int p = HPARENT (k);
1817 if (UPHEAP_DONE (p, k) || ANHE_at (heap [p]) <= ANHE_at (he))
1820 heap [k] = heap [p];
1821 ev_active (ANHE_w (heap [k])) = k;
1826 ev_active (ANHE_w (he)) = k;
1829 /* move an element suitably so it is in a correct place */
1831 adjustheap (ANHE *heap, int N, int k)
1833 if (k > HEAP0 && ANHE_at (heap [k]) <= ANHE_at (heap [HPARENT (k)]))
1836 downheap (heap, N, k);
1839 /* rebuild the heap: this function is used only once and executed rarely */
1841 reheap (ANHE *heap, int N)
1845 /* we don't use floyds algorithm, upheap is simpler and is more cache-efficient */
1846 /* also, this is easy to implement and correct for both 2-heaps and 4-heaps */
1847 for (i = 0; i < N; ++i)
1848 upheap (heap, i + HEAP0);
1851 /*****************************************************************************/
1853 /* associate signal watchers to a signal signal */
1856 EV_ATOMIC_T pending;
1863 static ANSIG signals [EV_NSIG - 1];
1865 /*****************************************************************************/
1867 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
1869 static void noinline ecb_cold
1872 if (!ev_is_active (&pipe_w))
1875 evfd = eventfd (0, EFD_NONBLOCK | EFD_CLOEXEC);
1876 if (evfd < 0 && errno == EINVAL)
1877 evfd = eventfd (0, 0);
1882 fd_intern (evfd); /* doing it twice doesn't hurt */
1883 ev_io_set (&pipe_w, evfd, EV_READ);
1888 while (pipe (evpipe))
1889 ev_syserr ("(libev) error creating signal/async pipe");
1891 fd_intern (evpipe [0]);
1892 fd_intern (evpipe [1]);
1893 ev_io_set (&pipe_w, evpipe [0], EV_READ);
1896 ev_io_start (EV_A_ &pipe_w);
1897 ev_unref (EV_A); /* watcher should not keep loop alive */
1902 evpipe_write (EV_P_ EV_ATOMIC_T *flag)
1904 ECB_MEMORY_FENCE; /* push out the write before this function was called, acquire flag */
1906 if (expect_true (*flag))
1910 ECB_MEMORY_FENCE_RELEASE; /* make sure flag is visible before the wakeup */
1912 pipe_write_skipped = 1;
1914 ECB_MEMORY_FENCE; /* make sure pipe_write_skipped is visible before we check pipe_write_wanted */
1916 if (pipe_write_wanted)
1920 pipe_write_skipped = 0;
1921 ECB_MEMORY_FENCE_RELEASE;
1923 old_errno = errno; /* save errno because write will clobber it */
1928 uint64_t counter = 1;
1929 write (evfd, &counter, sizeof (uint64_t));
1939 WSASend (EV_FD_TO_WIN32_HANDLE (evpipe [1]), &buf, 1, &sent, 0, 0, 0);
1941 write (evpipe [1], &(evpipe [1]), 1);
1949 /* called whenever the libev signal pipe */
1950 /* got some events (signal, async) */
1952 pipecb (EV_P_ ev_io *iow, int revents)
1956 if (revents & EV_READ)
1962 read (evfd, &counter, sizeof (uint64_t));
1973 buf.len = sizeof (dummy);
1974 WSARecv (EV_FD_TO_WIN32_HANDLE (evpipe [0]), &buf, 1, &recvd, &flags, 0, 0);
1976 read (evpipe [0], &dummy, sizeof (dummy));
1981 pipe_write_skipped = 0;
1983 ECB_MEMORY_FENCE; /* push out skipped, acquire flags */
1985 #if EV_SIGNAL_ENABLE
1992 for (i = EV_NSIG - 1; i--; )
1993 if (expect_false (signals [i].pending))
1994 ev_feed_signal_event (EV_A_ i + 1);
2005 for (i = asynccnt; i--; )
2006 if (asyncs [i]->sent)
2008 asyncs [i]->sent = 0;
2009 ECB_MEMORY_FENCE_RELEASE;
2010 ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
2016 /*****************************************************************************/
2019 ev_feed_signal (int signum) EV_THROW
2022 EV_P = signals [signum - 1].loop;
2028 if (!ev_active (&pipe_w))
2031 signals [signum - 1].pending = 1;
2032 evpipe_write (EV_A_ &sig_pending);
2036 ev_sighandler (int signum)
2039 signal (signum, ev_sighandler);
2042 ev_feed_signal (signum);
2046 ev_feed_signal_event (EV_P_ int signum) EV_THROW
2050 if (expect_false (signum <= 0 || signum > EV_NSIG))
2056 /* it is permissible to try to feed a signal to the wrong loop */
2057 /* or, likely more useful, feeding a signal nobody is waiting for */
2059 if (expect_false (signals [signum].loop != EV_A))
2063 signals [signum].pending = 0;
2064 MEMORY_FENCE_RELEASE;
2066 for (w = signals [signum].head; w; w = w->next)
2067 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
2072 sigfdcb (EV_P_ ev_io *iow, int revents)
2074 struct signalfd_siginfo si[2], *sip; /* these structs are big */
2078 ssize_t res = read (sigfd, si, sizeof (si));
2080 /* not ISO-C, as res might be -1, but works with SuS */
2081 for (sip = si; (char *)sip < (char *)si + res; ++sip)
2082 ev_feed_signal_event (EV_A_ sip->ssi_signo);
2084 if (res < (ssize_t)sizeof (si))
2092 /*****************************************************************************/
2095 static WL childs [EV_PID_HASHSIZE];
2097 static ev_signal childev;
2099 #ifndef WIFCONTINUED
2100 # define WIFCONTINUED(status) 0
2103 /* handle a single child status event */
2105 child_reap (EV_P_ int chain, int pid, int status)
2108 int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
2110 for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next)
2112 if ((w->pid == pid || !w->pid)
2113 && (!traced || (w->flags & 1)))
2115 ev_set_priority (w, EV_MAXPRI); /* need to do it *now*, this *must* be the same prio as the signal watcher itself */
2117 w->rstatus = status;
2118 ev_feed_event (EV_A_ (W)w, EV_CHILD);
2124 # define WCONTINUED 0
2127 /* called on sigchld etc., calls waitpid */
2129 childcb (EV_P_ ev_signal *sw, int revents)
2133 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
2134 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
2137 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
2140 /* make sure we are called again until all children have been reaped */
2141 /* we need to do it this way so that the callback gets called before we continue */
2142 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
2144 child_reap (EV_A_ pid, pid, status);
2145 if ((EV_PID_HASHSIZE) > 1)
2146 child_reap (EV_A_ 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
2151 /*****************************************************************************/
2154 # include "ev_iocp.c"
2157 # include "ev_port.c"
2160 # include "ev_kqueue.c"
2163 # include "ev_epoll.c"
2166 # include "ev_poll.c"
2169 # include "ev_select.c"
2173 ev_version_major (void) EV_THROW
2175 return EV_VERSION_MAJOR;
2179 ev_version_minor (void) EV_THROW
2181 return EV_VERSION_MINOR;
2184 /* return true if we are running with elevated privileges and should ignore env variables */
2185 int inline_size ecb_cold
2186 enable_secure (void)
2191 return getuid () != geteuid ()
2192 || getgid () != getegid ();
2196 unsigned int ecb_cold
2197 ev_supported_backends (void) EV_THROW
2199 unsigned int flags = 0;
2201 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
2202 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
2203 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
2204 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
2205 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
2210 unsigned int ecb_cold
2211 ev_recommended_backends (void) EV_THROW
2213 unsigned int flags = ev_supported_backends ();
2216 /* kqueue is borked on everything but netbsd apparently */
2217 /* it usually doesn't work correctly on anything but sockets and pipes */
2218 flags &= ~EVBACKEND_KQUEUE;
2221 /* only select works correctly on that "unix-certified" platform */
2222 flags &= ~EVBACKEND_KQUEUE; /* horribly broken, even for sockets */
2223 flags &= ~EVBACKEND_POLL; /* poll is based on kqueue from 10.5 onwards */
2226 flags &= ~EVBACKEND_POLL; /* poll return value is unusable (http://forums.freebsd.org/archive/index.php/t-10270.html) */
2232 unsigned int ecb_cold
2233 ev_embeddable_backends (void) EV_THROW
2235 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
2237 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
2238 if (ev_linux_version () < 0x020620) /* disable it on linux < 2.6.32 */
2239 flags &= ~EVBACKEND_EPOLL;
2245 ev_backend (EV_P) EV_THROW
2252 ev_iteration (EV_P) EV_THROW
2258 ev_depth (EV_P) EV_THROW
2264 ev_set_io_collect_interval (EV_P_ ev_tstamp interval) EV_THROW
2266 io_blocktime = interval;
2270 ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval) EV_THROW
2272 timeout_blocktime = interval;
2276 ev_set_userdata (EV_P_ void *data) EV_THROW
2282 ev_userdata (EV_P) EV_THROW
2288 ev_set_invoke_pending_cb (EV_P_ void (*invoke_pending_cb)(EV_P)) EV_THROW
2290 invoke_cb = invoke_pending_cb;
2294 ev_set_loop_release_cb (EV_P_ void (*release)(EV_P) EV_THROW, void (*acquire)(EV_P) EV_THROW) EV_THROW
2296 release_cb = release;
2297 acquire_cb = acquire;
2301 /* initialise a loop structure, must be zero-initialised */
2302 static void noinline ecb_cold
2303 loop_init (EV_P_ unsigned int flags) EV_THROW
2314 if (!clock_gettime (CLOCK_REALTIME, &ts))
2319 #if EV_USE_MONOTONIC
2320 if (!have_monotonic)
2324 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
2329 /* pid check not overridable via env */
2331 if (flags & EVFLAG_FORKCHECK)
2335 if (!(flags & EVFLAG_NOENV)
2336 && !enable_secure ()
2337 && getenv ("LIBEV_FLAGS"))
2338 flags = atoi (getenv ("LIBEV_FLAGS"));
2340 ev_rt_now = ev_time ();
2341 mn_now = get_clock ();
2343 rtmn_diff = ev_rt_now - mn_now;
2345 invoke_cb = ev_invoke_pending;
2349 timeout_blocktime = 0.;
2356 pipe_write_skipped = 0;
2357 pipe_write_wanted = 0;
2359 fs_fd = flags & EVFLAG_NOINOTIFY ? -1 : -2;
2362 sigfd = flags & EVFLAG_SIGNALFD ? -2 : -1;
2365 if (!(flags & EVBACKEND_MASK))
2366 flags |= ev_recommended_backends ();
2369 if (!backend && (flags & EVBACKEND_IOCP )) backend = iocp_init (EV_A_ flags);
2372 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
2375 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
2378 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
2381 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
2384 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
2387 ev_prepare_init (&pending_w, pendingcb);
2389 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
2390 ev_init (&pipe_w, pipecb);
2391 ev_set_priority (&pipe_w, EV_MAXPRI);
2396 /* free up a loop structure */
2398 ev_loop_destroy (EV_P)
2403 /* mimic free (0) */
2408 #if EV_CLEANUP_ENABLE
2409 /* queue cleanup watchers (and execute them) */
2410 if (expect_false (cleanupcnt))
2412 queue_events (EV_A_ (W *)cleanups, cleanupcnt, EV_CLEANUP);
2418 if (ev_is_default_loop (EV_A) && ev_is_active (&childev))
2420 ev_ref (EV_A); /* child watcher */
2421 ev_signal_stop (EV_A_ &childev);
2425 if (ev_is_active (&pipe_w))
2428 /*ev_io_stop (EV_A_ &pipe_w);*/
2435 if (evpipe [0] >= 0)
2437 EV_WIN32_CLOSE_FD (evpipe [0]);
2438 EV_WIN32_CLOSE_FD (evpipe [1]);
2443 if (ev_is_active (&sigfd_w))
2452 if (backend_fd >= 0)
2456 if (backend == EVBACKEND_IOCP ) iocp_destroy (EV_A);
2459 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
2462 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
2465 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
2468 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
2471 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
2474 for (i = NUMPRI; i--; )
2476 array_free (pending, [i]);
2478 array_free (idle, [i]);
2482 ev_free (anfds); anfds = 0; anfdmax = 0;
2484 /* have to use the microsoft-never-gets-it-right macro */
2485 array_free (rfeed, EMPTY);
2486 array_free (fdchange, EMPTY);
2487 array_free (timer, EMPTY);
2488 #if EV_PERIODIC_ENABLE
2489 array_free (periodic, EMPTY);
2492 array_free (fork, EMPTY);
2494 #if EV_CLEANUP_ENABLE
2495 array_free (cleanup, EMPTY);
2497 array_free (prepare, EMPTY);
2498 array_free (check, EMPTY);
2500 array_free (async, EMPTY);
2506 if (ev_is_default_loop (EV_A))
2508 ev_default_loop_ptr = 0;
2516 inline_size void infy_fork (EV_P);
2523 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
2526 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
2529 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
2535 if (ev_is_active (&pipe_w))
2537 /* pipe_write_wanted must be false now, so modifying fd vars should be safe */
2540 ev_io_stop (EV_A_ &pipe_w);
2547 if (evpipe [0] >= 0)
2549 EV_WIN32_CLOSE_FD (evpipe [0]);
2550 EV_WIN32_CLOSE_FD (evpipe [1]);
2553 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
2555 /* now iterate over everything, in case we missed something */
2556 pipecb (EV_A_ &pipe_w, EV_READ);
2565 struct ev_loop * ecb_cold
2566 ev_loop_new (unsigned int flags) EV_THROW
2568 EV_P = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
2570 memset (EV_A, 0, sizeof (struct ev_loop));
2571 loop_init (EV_A_ flags);
2573 if (ev_backend (EV_A))
2580 #endif /* multiplicity */
2583 static void noinline ecb_cold
2584 verify_watcher (EV_P_ W w)
2586 assert (("libev: watcher has invalid priority", ABSPRI (w) >= 0 && ABSPRI (w) < NUMPRI));
2589 assert (("libev: pending watcher not on pending queue", pendings [ABSPRI (w)][w->pending - 1].w == w));
2592 static void noinline ecb_cold
2593 verify_heap (EV_P_ ANHE *heap, int N)
2597 for (i = HEAP0; i < N + HEAP0; ++i)
2599 assert (("libev: active index mismatch in heap", ev_active (ANHE_w (heap [i])) == i));
2600 assert (("libev: heap condition violated", i == HEAP0 || ANHE_at (heap [HPARENT (i)]) <= ANHE_at (heap [i])));
2601 assert (("libev: heap at cache mismatch", ANHE_at (heap [i]) == ev_at (ANHE_w (heap [i]))));
2603 verify_watcher (EV_A_ (W)ANHE_w (heap [i]));
2607 static void noinline ecb_cold
2608 array_verify (EV_P_ W *ws, int cnt)
2612 assert (("libev: active index mismatch", ev_active (ws [cnt]) == cnt + 1));
2613 verify_watcher (EV_A_ ws [cnt]);
2620 ev_verify (EV_P) EV_THROW
2626 assert (activecnt >= -1);
2628 assert (fdchangemax >= fdchangecnt);
2629 for (i = 0; i < fdchangecnt; ++i)
2630 assert (("libev: negative fd in fdchanges", fdchanges [i] >= 0));
2632 assert (anfdmax >= 0);
2633 for (i = 0; i < anfdmax; ++i)
2637 for (w = w2 = anfds [i].head; w; w = w->next)
2639 verify_watcher (EV_A_ (W)w);
2643 assert (("libev: io watcher list contains a loop", w != w2));
2647 assert (("libev: inactive fd watcher on anfd list", ev_active (w) == 1));
2648 assert (("libev: fd mismatch between watcher and anfd", ((ev_io *)w)->fd == i));
2652 assert (timermax >= timercnt);
2653 verify_heap (EV_A_ timers, timercnt);
2655 #if EV_PERIODIC_ENABLE
2656 assert (periodicmax >= periodiccnt);
2657 verify_heap (EV_A_ periodics, periodiccnt);
2660 for (i = NUMPRI; i--; )
2662 assert (pendingmax [i] >= pendingcnt [i]);
2664 assert (idleall >= 0);
2665 assert (idlemax [i] >= idlecnt [i]);
2666 array_verify (EV_A_ (W *)idles [i], idlecnt [i]);
2671 assert (forkmax >= forkcnt);
2672 array_verify (EV_A_ (W *)forks, forkcnt);
2675 #if EV_CLEANUP_ENABLE
2676 assert (cleanupmax >= cleanupcnt);
2677 array_verify (EV_A_ (W *)cleanups, cleanupcnt);
2681 assert (asyncmax >= asynccnt);
2682 array_verify (EV_A_ (W *)asyncs, asynccnt);
2685 #if EV_PREPARE_ENABLE
2686 assert (preparemax >= preparecnt);
2687 array_verify (EV_A_ (W *)prepares, preparecnt);
2691 assert (checkmax >= checkcnt);
2692 array_verify (EV_A_ (W *)checks, checkcnt);
2697 for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next)
2698 for (signum = EV_NSIG; signum--; ) if (signals [signum].pending)
2706 struct ev_loop * ecb_cold
2710 ev_default_loop (unsigned int flags) EV_THROW
2712 if (!ev_default_loop_ptr)
2715 EV_P = ev_default_loop_ptr = &default_loop_struct;
2717 ev_default_loop_ptr = 1;
2720 loop_init (EV_A_ flags);
2722 if (ev_backend (EV_A))
2725 ev_signal_init (&childev, childcb, SIGCHLD);
2726 ev_set_priority (&childev, EV_MAXPRI);
2727 ev_signal_start (EV_A_ &childev);
2728 ev_unref (EV_A); /* child watcher should not keep loop alive */
2732 ev_default_loop_ptr = 0;
2735 return ev_default_loop_ptr;
2739 ev_loop_fork (EV_P) EV_THROW
2741 postfork = 1; /* must be in line with ev_default_fork */
2744 /*****************************************************************************/
2747 ev_invoke (EV_P_ void *w, int revents)
2749 EV_CB_INVOKE ((W)w, revents);
2753 ev_pending_count (EV_P) EV_THROW
2756 unsigned int count = 0;
2758 for (pri = NUMPRI; pri--; )
2759 count += pendingcnt [pri];
2765 ev_invoke_pending (EV_P)
2767 for (pendingpri = NUMPRI; pendingpri--; ) /* pendingpri is modified during the loop */
2768 while (pendingcnt [pendingpri])
2770 ANPENDING *p = pendings [pendingpri] + --pendingcnt [pendingpri];
2773 EV_CB_INVOKE (p->w, p->events);
2779 /* make idle watchers pending. this handles the "call-idle */
2780 /* only when higher priorities are idle" logic */
2784 if (expect_false (idleall))
2788 for (pri = NUMPRI; pri--; )
2790 if (pendingcnt [pri])
2795 queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
2803 /* make timers pending */
2809 if (timercnt && ANHE_at (timers [HEAP0]) < mn_now)
2813 ev_timer *w = (ev_timer *)ANHE_w (timers [HEAP0]);
2815 /*assert (("libev: inactive timer on timer heap detected", ev_is_active (w)));*/
2817 /* first reschedule or stop timer */
2820 ev_at (w) += w->repeat;
2821 if (ev_at (w) < mn_now)
2824 assert (("libev: negative ev_timer repeat value found while processing timers", w->repeat > 0.));
2826 ANHE_at_cache (timers [HEAP0]);
2827 downheap (timers, timercnt, HEAP0);
2830 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
2833 feed_reverse (EV_A_ (W)w);
2835 while (timercnt && ANHE_at (timers [HEAP0]) < mn_now);
2837 feed_reverse_done (EV_A_ EV_TIMER);
2841 #if EV_PERIODIC_ENABLE
2843 static void noinline
2844 periodic_recalc (EV_P_ ev_periodic *w)
2846 ev_tstamp interval = w->interval > MIN_INTERVAL ? w->interval : MIN_INTERVAL;
2847 ev_tstamp at = w->offset + interval * ev_floor ((ev_rt_now - w->offset) / interval);
2849 /* the above almost always errs on the low side */
2850 while (at <= ev_rt_now)
2852 ev_tstamp nat = at + w->interval;
2854 /* when resolution fails us, we use ev_rt_now */
2855 if (expect_false (nat == at))
2867 /* make periodics pending */
2869 periodics_reify (EV_P)
2873 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now)
2877 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [HEAP0]);
2879 /*assert (("libev: inactive timer on periodic heap detected", ev_is_active (w)));*/
2881 /* first reschedule or stop timer */
2882 if (w->reschedule_cb)
2884 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2886 assert (("libev: ev_periodic reschedule callback returned time in the past", ev_at (w) >= ev_rt_now));
2888 ANHE_at_cache (periodics [HEAP0]);
2889 downheap (periodics, periodiccnt, HEAP0);
2891 else if (w->interval)
2893 periodic_recalc (EV_A_ w);
2894 ANHE_at_cache (periodics [HEAP0]);
2895 downheap (periodics, periodiccnt, HEAP0);
2898 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
2901 feed_reverse (EV_A_ (W)w);
2903 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now);
2905 feed_reverse_done (EV_A_ EV_PERIODIC);
2909 /* simply recalculate all periodics */
2910 /* TODO: maybe ensure that at least one event happens when jumping forward? */
2911 static void noinline ecb_cold
2912 periodics_reschedule (EV_P)
2916 /* adjust periodics after time jump */
2917 for (i = HEAP0; i < periodiccnt + HEAP0; ++i)
2919 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [i]);
2921 if (w->reschedule_cb)
2922 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2923 else if (w->interval)
2924 periodic_recalc (EV_A_ w);
2926 ANHE_at_cache (periodics [i]);
2929 reheap (periodics, periodiccnt);
2933 /* adjust all timers by a given offset */
2934 static void noinline ecb_cold
2935 timers_reschedule (EV_P_ ev_tstamp adjust)
2939 for (i = 0; i < timercnt; ++i)
2941 ANHE *he = timers + i + HEAP0;
2942 ANHE_w (*he)->at += adjust;
2943 ANHE_at_cache (*he);
2947 /* fetch new monotonic and realtime times from the kernel */
2948 /* also detect if there was a timejump, and act accordingly */
2950 time_update (EV_P_ ev_tstamp max_block)
2952 #if EV_USE_MONOTONIC
2953 if (expect_true (have_monotonic))
2956 ev_tstamp odiff = rtmn_diff;
2958 mn_now = get_clock ();
2960 /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
2961 /* interpolate in the meantime */
2962 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
2964 ev_rt_now = rtmn_diff + mn_now;
2969 ev_rt_now = ev_time ();
2971 /* loop a few times, before making important decisions.
2972 * on the choice of "4": one iteration isn't enough,
2973 * in case we get preempted during the calls to
2974 * ev_time and get_clock. a second call is almost guaranteed
2975 * to succeed in that case, though. and looping a few more times
2976 * doesn't hurt either as we only do this on time-jumps or
2977 * in the unlikely event of having been preempted here.
2982 rtmn_diff = ev_rt_now - mn_now;
2984 diff = odiff - rtmn_diff;
2986 if (expect_true ((diff < 0. ? -diff : diff) < MIN_TIMEJUMP))
2987 return; /* all is well */
2989 ev_rt_now = ev_time ();
2990 mn_now = get_clock ();
2994 /* no timer adjustment, as the monotonic clock doesn't jump */
2995 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
2996 # if EV_PERIODIC_ENABLE
2997 periodics_reschedule (EV_A);
3003 ev_rt_now = ev_time ();
3005 if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
3007 /* adjust timers. this is easy, as the offset is the same for all of them */
3008 timers_reschedule (EV_A_ ev_rt_now - mn_now);
3009 #if EV_PERIODIC_ENABLE
3010 periodics_reschedule (EV_A);
3019 ev_run (EV_P_ int flags)
3025 assert (("libev: ev_loop recursion during release detected", loop_done != EVBREAK_RECURSE));
3027 loop_done = EVBREAK_CANCEL;
3029 EV_INVOKE_PENDING; /* in case we recurse, ensure ordering stays nice and clean */
3038 if (expect_false (curpid)) /* penalise the forking check even more */
3039 if (expect_false (getpid () != curpid))
3047 /* we might have forked, so queue fork handlers */
3048 if (expect_false (postfork))
3051 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
3056 #if EV_PREPARE_ENABLE
3057 /* queue prepare watchers (and execute them) */
3058 if (expect_false (preparecnt))
3060 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
3065 if (expect_false (loop_done))
3068 /* we might have forked, so reify kernel state if necessary */
3069 if (expect_false (postfork))
3072 /* update fd-related kernel structures */
3075 /* calculate blocking time */
3077 ev_tstamp waittime = 0.;
3078 ev_tstamp sleeptime = 0.;
3080 /* remember old timestamp for io_blocktime calculation */
3081 ev_tstamp prev_mn_now = mn_now;
3083 /* update time to cancel out callback processing overhead */
3084 time_update (EV_A_ 1e100);
3086 /* from now on, we want a pipe-wake-up */
3087 pipe_write_wanted = 1;
3089 ECB_MEMORY_FENCE; /* make sure pipe_write_wanted is visible before we check for potential skips */
3091 if (expect_true (!(flags & EVRUN_NOWAIT || idleall || !activecnt || pipe_write_skipped)))
3093 waittime = MAX_BLOCKTIME;
3097 ev_tstamp to = ANHE_at (timers [HEAP0]) - mn_now;
3098 if (waittime > to) waittime = to;
3101 #if EV_PERIODIC_ENABLE
3104 ev_tstamp to = ANHE_at (periodics [HEAP0]) - ev_rt_now;
3105 if (waittime > to) waittime = to;
3109 /* don't let timeouts decrease the waittime below timeout_blocktime */
3110 if (expect_false (waittime < timeout_blocktime))
3111 waittime = timeout_blocktime;
3113 /* at this point, we NEED to wait, so we have to ensure */
3114 /* to pass a minimum nonzero value to the backend */
3115 if (expect_false (waittime < backend_mintime))
3116 waittime = backend_mintime;
3118 /* extra check because io_blocktime is commonly 0 */
3119 if (expect_false (io_blocktime))
3121 sleeptime = io_blocktime - (mn_now - prev_mn_now);
3123 if (sleeptime > waittime - backend_mintime)
3124 sleeptime = waittime - backend_mintime;
3126 if (expect_true (sleeptime > 0.))
3128 ev_sleep (sleeptime);
3129 waittime -= sleeptime;
3137 assert ((loop_done = EVBREAK_RECURSE, 1)); /* assert for side effect */
3138 backend_poll (EV_A_ waittime);
3139 assert ((loop_done = EVBREAK_CANCEL, 1)); /* assert for side effect */
3141 pipe_write_wanted = 0; /* just an optimisation, no fence needed */
3143 if (pipe_write_skipped)
3145 assert (("libev: pipe_w not active, but pipe not written", ev_is_active (&pipe_w)));
3146 ev_feed_event (EV_A_ &pipe_w, EV_CUSTOM);
3150 /* update ev_rt_now, do magic */
3151 time_update (EV_A_ waittime + sleeptime);
3154 /* queue pending timers and reschedule them */
3155 timers_reify (EV_A); /* relative timers called last */
3156 #if EV_PERIODIC_ENABLE
3157 periodics_reify (EV_A); /* absolute timers called first */
3161 /* queue idle watchers unless other events are pending */
3166 /* queue check watchers, to be executed first */
3167 if (expect_false (checkcnt))
3168 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
3173 while (expect_true (
3176 && !(flags & (EVRUN_ONCE | EVRUN_NOWAIT))
3179 if (loop_done == EVBREAK_ONE)
3180 loop_done = EVBREAK_CANCEL;
3190 ev_break (EV_P_ int how) EV_THROW
3196 ev_ref (EV_P) EV_THROW
3202 ev_unref (EV_P) EV_THROW
3208 ev_now_update (EV_P) EV_THROW
3210 time_update (EV_A_ 1e100);
3214 ev_suspend (EV_P) EV_THROW
3216 ev_now_update (EV_A);
3220 ev_resume (EV_P) EV_THROW
3222 ev_tstamp mn_prev = mn_now;
3224 ev_now_update (EV_A);
3225 timers_reschedule (EV_A_ mn_now - mn_prev);
3226 #if EV_PERIODIC_ENABLE
3227 /* TODO: really do this? */
3228 periodics_reschedule (EV_A);
3232 /*****************************************************************************/
3233 /* singly-linked list management, used when the expected list length is short */
3236 wlist_add (WL *head, WL elem)
3243 wlist_del (WL *head, WL elem)
3247 if (expect_true (*head == elem))
3253 head = &(*head)->next;
3257 /* internal, faster, version of ev_clear_pending */
3259 clear_pending (EV_P_ W w)
3263 pendings [ABSPRI (w)][w->pending - 1].w = (W)&pending_w;
3269 ev_clear_pending (EV_P_ void *w) EV_THROW
3272 int pending = w_->pending;
3274 if (expect_true (pending))
3276 ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
3277 p->w = (W)&pending_w;
3286 pri_adjust (EV_P_ W w)
3288 int pri = ev_priority (w);
3289 pri = pri < EV_MINPRI ? EV_MINPRI : pri;
3290 pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
3291 ev_set_priority (w, pri);
3295 ev_start (EV_P_ W w, int active)
3297 pri_adjust (EV_A_ w);
3309 /*****************************************************************************/
3312 ev_io_start (EV_P_ ev_io *w) EV_THROW
3316 if (expect_false (ev_is_active (w)))
3319 assert (("libev: ev_io_start called with negative fd", fd >= 0));
3320 assert (("libev: ev_io_start called with illegal event mask", !(w->events & ~(EV__IOFDSET | EV_READ | EV_WRITE))));
3324 ev_start (EV_A_ (W)w, 1);
3325 array_needsize (ANFD, anfds, anfdmax, fd + 1, array_init_zero);
3326 wlist_add (&anfds[fd].head, (WL)w);
3328 /* common bug, apparently */
3329 assert (("libev: ev_io_start called with corrupted watcher", ((WL)w)->next != (WL)w));
3331 fd_change (EV_A_ fd, w->events & EV__IOFDSET | EV_ANFD_REIFY);
3332 w->events &= ~EV__IOFDSET;
3338 ev_io_stop (EV_P_ ev_io *w) EV_THROW
3340 clear_pending (EV_A_ (W)w);
3341 if (expect_false (!ev_is_active (w)))
3344 assert (("libev: ev_io_stop called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
3348 wlist_del (&anfds[w->fd].head, (WL)w);
3349 ev_stop (EV_A_ (W)w);
3351 fd_change (EV_A_ w->fd, EV_ANFD_REIFY);
3357 ev_timer_start (EV_P_ ev_timer *w) EV_THROW
3359 if (expect_false (ev_is_active (w)))
3362 ev_at (w) += mn_now;
3364 assert (("libev: ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
3369 ev_start (EV_A_ (W)w, timercnt + HEAP0 - 1);
3370 array_needsize (ANHE, timers, timermax, ev_active (w) + 1, EMPTY2);
3371 ANHE_w (timers [ev_active (w)]) = (WT)w;
3372 ANHE_at_cache (timers [ev_active (w)]);
3373 upheap (timers, ev_active (w));
3377 /*assert (("libev: internal timer heap corruption", timers [ev_active (w)] == (WT)w));*/
3381 ev_timer_stop (EV_P_ ev_timer *w) EV_THROW
3383 clear_pending (EV_A_ (W)w);
3384 if (expect_false (!ev_is_active (w)))
3390 int active = ev_active (w);
3392 assert (("libev: internal timer heap corruption", ANHE_w (timers [active]) == (WT)w));
3396 if (expect_true (active < timercnt + HEAP0))
3398 timers [active] = timers [timercnt + HEAP0];
3399 adjustheap (timers, timercnt, active);
3403 ev_at (w) -= mn_now;
3405 ev_stop (EV_A_ (W)w);
3411 ev_timer_again (EV_P_ ev_timer *w) EV_THROW
3415 clear_pending (EV_A_ (W)w);
3417 if (ev_is_active (w))
3421 ev_at (w) = mn_now + w->repeat;
3422 ANHE_at_cache (timers [ev_active (w)]);
3423 adjustheap (timers, timercnt, ev_active (w));
3426 ev_timer_stop (EV_A_ w);
3430 ev_at (w) = w->repeat;
3431 ev_timer_start (EV_A_ w);
3438 ev_timer_remaining (EV_P_ ev_timer *w) EV_THROW
3440 return ev_at (w) - (ev_is_active (w) ? mn_now : 0.);
3443 #if EV_PERIODIC_ENABLE
3445 ev_periodic_start (EV_P_ ev_periodic *w) EV_THROW
3447 if (expect_false (ev_is_active (w)))
3450 if (w->reschedule_cb)
3451 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
3452 else if (w->interval)
3454 assert (("libev: ev_periodic_start called with negative interval value", w->interval >= 0.));
3455 periodic_recalc (EV_A_ w);
3458 ev_at (w) = w->offset;
3463 ev_start (EV_A_ (W)w, periodiccnt + HEAP0 - 1);
3464 array_needsize (ANHE, periodics, periodicmax, ev_active (w) + 1, EMPTY2);
3465 ANHE_w (periodics [ev_active (w)]) = (WT)w;
3466 ANHE_at_cache (periodics [ev_active (w)]);
3467 upheap (periodics, ev_active (w));
3471 /*assert (("libev: internal periodic heap corruption", ANHE_w (periodics [ev_active (w)]) == (WT)w));*/
3475 ev_periodic_stop (EV_P_ ev_periodic *w) EV_THROW
3477 clear_pending (EV_A_ (W)w);
3478 if (expect_false (!ev_is_active (w)))
3484 int active = ev_active (w);
3486 assert (("libev: internal periodic heap corruption", ANHE_w (periodics [active]) == (WT)w));
3490 if (expect_true (active < periodiccnt + HEAP0))
3492 periodics [active] = periodics [periodiccnt + HEAP0];
3493 adjustheap (periodics, periodiccnt, active);
3497 ev_stop (EV_A_ (W)w);
3503 ev_periodic_again (EV_P_ ev_periodic *w) EV_THROW
3505 /* TODO: use adjustheap and recalculation */
3506 ev_periodic_stop (EV_A_ w);
3507 ev_periodic_start (EV_A_ w);
3512 # define SA_RESTART 0
3515 #if EV_SIGNAL_ENABLE
3518 ev_signal_start (EV_P_ ev_signal *w) EV_THROW
3520 if (expect_false (ev_is_active (w)))
3523 assert (("libev: ev_signal_start called with illegal signal number", w->signum > 0 && w->signum < EV_NSIG));
3526 assert (("libev: a signal must not be attached to two different loops",
3527 !signals [w->signum - 1].loop || signals [w->signum - 1].loop == loop));
3529 signals [w->signum - 1].loop = EV_A;
3537 sigfd = signalfd (-1, &sigfd_set, SFD_NONBLOCK | SFD_CLOEXEC);
3538 if (sigfd < 0 && errno == EINVAL)
3539 sigfd = signalfd (-1, &sigfd_set, 0); /* retry without flags */
3543 fd_intern (sigfd); /* doing it twice will not hurt */
3545 sigemptyset (&sigfd_set);
3547 ev_io_init (&sigfd_w, sigfdcb, sigfd, EV_READ);
3548 ev_set_priority (&sigfd_w, EV_MAXPRI);
3549 ev_io_start (EV_A_ &sigfd_w);
3550 ev_unref (EV_A); /* signalfd watcher should not keep loop alive */
3556 /* TODO: check .head */
3557 sigaddset (&sigfd_set, w->signum);
3558 sigprocmask (SIG_BLOCK, &sigfd_set, 0);
3560 signalfd (sigfd, &sigfd_set, 0);
3564 ev_start (EV_A_ (W)w, 1);
3565 wlist_add (&signals [w->signum - 1].head, (WL)w);
3568 # if EV_USE_SIGNALFD
3569 if (sigfd < 0) /*TODO*/
3575 signal (w->signum, ev_sighandler);
3577 struct sigaction sa;
3581 sa.sa_handler = ev_sighandler;
3582 sigfillset (&sa.sa_mask);
3583 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
3584 sigaction (w->signum, &sa, 0);
3586 if (origflags & EVFLAG_NOSIGMASK)
3588 sigemptyset (&sa.sa_mask);
3589 sigaddset (&sa.sa_mask, w->signum);
3590 sigprocmask (SIG_UNBLOCK, &sa.sa_mask, 0);
3599 ev_signal_stop (EV_P_ ev_signal *w) EV_THROW
3601 clear_pending (EV_A_ (W)w);
3602 if (expect_false (!ev_is_active (w)))
3607 wlist_del (&signals [w->signum - 1].head, (WL)w);
3608 ev_stop (EV_A_ (W)w);
3610 if (!signals [w->signum - 1].head)
3613 signals [w->signum - 1].loop = 0; /* unattach from signal */
3621 sigaddset (&ss, w->signum);
3622 sigdelset (&sigfd_set, w->signum);
3624 signalfd (sigfd, &sigfd_set, 0);
3625 sigprocmask (SIG_UNBLOCK, &ss, 0);
3629 signal (w->signum, SIG_DFL);
3640 ev_child_start (EV_P_ ev_child *w) EV_THROW
3643 assert (("libev: child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
3645 if (expect_false (ev_is_active (w)))
3650 ev_start (EV_A_ (W)w, 1);
3651 wlist_add (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);
3657 ev_child_stop (EV_P_ ev_child *w) EV_THROW
3659 clear_pending (EV_A_ (W)w);
3660 if (expect_false (!ev_is_active (w)))
3665 wlist_del (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);
3666 ev_stop (EV_A_ (W)w);
3677 # define lstat(a,b) _stati64 (a,b)
3680 #define DEF_STAT_INTERVAL 5.0074891
3681 #define NFS_STAT_INTERVAL 30.1074891 /* for filesystems potentially failing inotify */
3682 #define MIN_STAT_INTERVAL 0.1074891
3684 static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
3688 /* the * 2 is to allow for alignment padding, which for some reason is >> 8 */
3689 # define EV_INOTIFY_BUFSIZE (sizeof (struct inotify_event) * 2 + NAME_MAX)
3691 static void noinline
3692 infy_add (EV_P_ ev_stat *w)
3694 w->wd = inotify_add_watch (fs_fd, w->path, IN_ATTRIB | IN_DELETE_SELF | IN_MOVE_SELF | IN_MODIFY | IN_DONT_FOLLOW | IN_MASK_ADD);
3700 /* now local changes will be tracked by inotify, but remote changes won't */
3701 /* unless the filesystem is known to be local, we therefore still poll */
3702 /* also do poll on <2.6.25, but with normal frequency */
3705 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3706 else if (!statfs (w->path, &sfs)
3707 && (sfs.f_type == 0x1373 /* devfs */
3708 || sfs.f_type == 0xEF53 /* ext2/3 */
3709 || sfs.f_type == 0x3153464a /* jfs */
3710 || sfs.f_type == 0x52654973 /* reiser3 */
3711 || sfs.f_type == 0x01021994 /* tempfs */
3712 || sfs.f_type == 0x58465342 /* xfs */))
3713 w->timer.repeat = 0.; /* filesystem is local, kernel new enough */
3715 w->timer.repeat = w->interval ? w->interval : NFS_STAT_INTERVAL; /* remote, use reduced frequency */
3719 /* can't use inotify, continue to stat */
3720 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3722 /* if path is not there, monitor some parent directory for speedup hints */
3723 /* note that exceeding the hardcoded path limit is not a correctness issue, */
3724 /* but an efficiency issue only */
3725 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
3728 strcpy (path, w->path);
3732 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
3733 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
3735 char *pend = strrchr (path, '/');
3737 if (!pend || pend == path)
3741 w->wd = inotify_add_watch (fs_fd, path, mask);
3743 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
3748 wlist_add (&fs_hash [w->wd & ((EV_INOTIFY_HASHSIZE) - 1)].head, (WL)w);
3750 /* now re-arm timer, if required */
3751 if (ev_is_active (&w->timer)) ev_ref (EV_A);
3752 ev_timer_again (EV_A_ &w->timer);
3753 if (ev_is_active (&w->timer)) ev_unref (EV_A);
3756 static void noinline
3757 infy_del (EV_P_ ev_stat *w)
3766 slot = wd & ((EV_INOTIFY_HASHSIZE) - 1);
3767 wlist_del (&fs_hash [slot].head, (WL)w);
3769 /* remove this watcher, if others are watching it, they will rearm */
3770 inotify_rm_watch (fs_fd, wd);
3773 static void noinline
3774 infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
3777 /* overflow, need to check for all hash slots */
3778 for (slot = 0; slot < (EV_INOTIFY_HASHSIZE); ++slot)
3779 infy_wd (EV_A_ slot, wd, ev);
3784 for (w_ = fs_hash [slot & ((EV_INOTIFY_HASHSIZE) - 1)].head; w_; )
3786 ev_stat *w = (ev_stat *)w_;
3787 w_ = w_->next; /* lets us remove this watcher and all before it */
3789 if (w->wd == wd || wd == -1)
3791 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
3793 wlist_del (&fs_hash [slot & ((EV_INOTIFY_HASHSIZE) - 1)].head, (WL)w);
3795 infy_add (EV_A_ w); /* re-add, no matter what */
3798 stat_timer_cb (EV_A_ &w->timer, 0);
3805 infy_cb (EV_P_ ev_io *w, int revents)
3807 char buf [EV_INOTIFY_BUFSIZE];
3809 int len = read (fs_fd, buf, sizeof (buf));
3811 for (ofs = 0; ofs < len; )
3813 struct inotify_event *ev = (struct inotify_event *)(buf + ofs);
3814 infy_wd (EV_A_ ev->wd, ev->wd, ev);
3815 ofs += sizeof (struct inotify_event) + ev->len;
3819 inline_size void ecb_cold
3820 ev_check_2625 (EV_P)
3822 /* kernels < 2.6.25 are borked
3823 * http://www.ussg.indiana.edu/hypermail/linux/kernel/0711.3/1208.html
3825 if (ev_linux_version () < 0x020619)
3834 #if defined IN_CLOEXEC && defined IN_NONBLOCK
3835 int fd = inotify_init1 (IN_CLOEXEC | IN_NONBLOCK);
3839 return inotify_init ();
3850 ev_check_2625 (EV_A);
3852 fs_fd = infy_newfd ();
3857 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
3858 ev_set_priority (&fs_w, EV_MAXPRI);
3859 ev_io_start (EV_A_ &fs_w);
3873 ev_io_stop (EV_A_ &fs_w);
3875 fs_fd = infy_newfd ();
3880 ev_io_set (&fs_w, fs_fd, EV_READ);
3881 ev_io_start (EV_A_ &fs_w);
3885 for (slot = 0; slot < (EV_INOTIFY_HASHSIZE); ++slot)
3887 WL w_ = fs_hash [slot].head;
3888 fs_hash [slot].head = 0;
3892 ev_stat *w = (ev_stat *)w_;
3893 w_ = w_->next; /* lets us add this watcher */
3898 infy_add (EV_A_ w); /* re-add, no matter what */
3901 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3902 if (ev_is_active (&w->timer)) ev_ref (EV_A);
3903 ev_timer_again (EV_A_ &w->timer);
3904 if (ev_is_active (&w->timer)) ev_unref (EV_A);
3913 # define EV_LSTAT(p,b) _stati64 (p, b)
3915 # define EV_LSTAT(p,b) lstat (p, b)
3919 ev_stat_stat (EV_P_ ev_stat *w) EV_THROW
3921 if (lstat (w->path, &w->attr) < 0)
3922 w->attr.st_nlink = 0;
3923 else if (!w->attr.st_nlink)
3924 w->attr.st_nlink = 1;
3927 static void noinline
3928 stat_timer_cb (EV_P_ ev_timer *w_, int revents)
3930 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
3932 ev_statdata prev = w->attr;
3933 ev_stat_stat (EV_A_ w);
3935 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
3937 prev.st_dev != w->attr.st_dev
3938 || prev.st_ino != w->attr.st_ino
3939 || prev.st_mode != w->attr.st_mode
3940 || prev.st_nlink != w->attr.st_nlink
3941 || prev.st_uid != w->attr.st_uid
3942 || prev.st_gid != w->attr.st_gid
3943 || prev.st_rdev != w->attr.st_rdev
3944 || prev.st_size != w->attr.st_size
3945 || prev.st_atime != w->attr.st_atime
3946 || prev.st_mtime != w->attr.st_mtime
3947 || prev.st_ctime != w->attr.st_ctime
3949 /* we only update w->prev on actual differences */
3950 /* in case we test more often than invoke the callback, */
3951 /* to ensure that prev is always different to attr */
3959 ev_stat_stat (EV_A_ w); /* avoid race... */
3963 ev_feed_event (EV_A_ w, EV_STAT);
3968 ev_stat_start (EV_P_ ev_stat *w) EV_THROW
3970 if (expect_false (ev_is_active (w)))
3973 ev_stat_stat (EV_A_ w);
3975 if (w->interval < MIN_STAT_INTERVAL && w->interval)
3976 w->interval = MIN_STAT_INTERVAL;
3978 ev_timer_init (&w->timer, stat_timer_cb, 0., w->interval ? w->interval : DEF_STAT_INTERVAL);
3979 ev_set_priority (&w->timer, ev_priority (w));
3989 ev_timer_again (EV_A_ &w->timer);
3993 ev_start (EV_A_ (W)w, 1);
3999 ev_stat_stop (EV_P_ ev_stat *w) EV_THROW
4001 clear_pending (EV_A_ (W)w);
4002 if (expect_false (!ev_is_active (w)))
4011 if (ev_is_active (&w->timer))
4014 ev_timer_stop (EV_A_ &w->timer);
4017 ev_stop (EV_A_ (W)w);
4025 ev_idle_start (EV_P_ ev_idle *w) EV_THROW
4027 if (expect_false (ev_is_active (w)))
4030 pri_adjust (EV_A_ (W)w);
4035 int active = ++idlecnt [ABSPRI (w)];
4038 ev_start (EV_A_ (W)w, active);
4040 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
4041 idles [ABSPRI (w)][active - 1] = w;
4048 ev_idle_stop (EV_P_ ev_idle *w) EV_THROW
4050 clear_pending (EV_A_ (W)w);
4051 if (expect_false (!ev_is_active (w)))
4057 int active = ev_active (w);
4059 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
4060 ev_active (idles [ABSPRI (w)][active - 1]) = active;
4062 ev_stop (EV_A_ (W)w);
4070 #if EV_PREPARE_ENABLE
4072 ev_prepare_start (EV_P_ ev_prepare *w) EV_THROW
4074 if (expect_false (ev_is_active (w)))
4079 ev_start (EV_A_ (W)w, ++preparecnt);
4080 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
4081 prepares [preparecnt - 1] = w;
4087 ev_prepare_stop (EV_P_ ev_prepare *w) EV_THROW
4089 clear_pending (EV_A_ (W)w);
4090 if (expect_false (!ev_is_active (w)))
4096 int active = ev_active (w);
4098 prepares [active - 1] = prepares [--preparecnt];
4099 ev_active (prepares [active - 1]) = active;
4102 ev_stop (EV_A_ (W)w);
4110 ev_check_start (EV_P_ ev_check *w) EV_THROW
4112 if (expect_false (ev_is_active (w)))
4117 ev_start (EV_A_ (W)w, ++checkcnt);
4118 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
4119 checks [checkcnt - 1] = w;
4125 ev_check_stop (EV_P_ ev_check *w) EV_THROW
4127 clear_pending (EV_A_ (W)w);
4128 if (expect_false (!ev_is_active (w)))
4134 int active = ev_active (w);
4136 checks [active - 1] = checks [--checkcnt];
4137 ev_active (checks [active - 1]) = active;
4140 ev_stop (EV_A_ (W)w);
4148 ev_embed_sweep (EV_P_ ev_embed *w) EV_THROW
4150 ev_run (w->other, EVRUN_NOWAIT);
4154 embed_io_cb (EV_P_ ev_io *io, int revents)
4156 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
4159 ev_feed_event (EV_A_ (W)w, EV_EMBED);
4161 ev_run (w->other, EVRUN_NOWAIT);
4165 embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
4167 ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
4175 ev_run (EV_A_ EVRUN_NOWAIT);
4181 embed_fork_cb (EV_P_ ev_fork *fork_w, int revents)
4183 ev_embed *w = (ev_embed *)(((char *)fork_w) - offsetof (ev_embed, fork));
4185 ev_embed_stop (EV_A_ w);
4190 ev_loop_fork (EV_A);
4191 ev_run (EV_A_ EVRUN_NOWAIT);
4194 ev_embed_start (EV_A_ w);
4199 embed_idle_cb (EV_P_ ev_idle *idle, int revents)
4201 ev_idle_stop (EV_A_ idle);
4206 ev_embed_start (EV_P_ ev_embed *w) EV_THROW
4208 if (expect_false (ev_is_active (w)))
4213 assert (("libev: loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
4214 ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
4219 ev_set_priority (&w->io, ev_priority (w));
4220 ev_io_start (EV_A_ &w->io);
4222 ev_prepare_init (&w->prepare, embed_prepare_cb);
4223 ev_set_priority (&w->prepare, EV_MINPRI);
4224 ev_prepare_start (EV_A_ &w->prepare);
4226 ev_fork_init (&w->fork, embed_fork_cb);
4227 ev_fork_start (EV_A_ &w->fork);
4229 /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
4231 ev_start (EV_A_ (W)w, 1);
4237 ev_embed_stop (EV_P_ ev_embed *w) EV_THROW
4239 clear_pending (EV_A_ (W)w);
4240 if (expect_false (!ev_is_active (w)))
4245 ev_io_stop (EV_A_ &w->io);
4246 ev_prepare_stop (EV_A_ &w->prepare);
4247 ev_fork_stop (EV_A_ &w->fork);
4249 ev_stop (EV_A_ (W)w);
4257 ev_fork_start (EV_P_ ev_fork *w) EV_THROW
4259 if (expect_false (ev_is_active (w)))
4264 ev_start (EV_A_ (W)w, ++forkcnt);
4265 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
4266 forks [forkcnt - 1] = w;
4272 ev_fork_stop (EV_P_ ev_fork *w) EV_THROW
4274 clear_pending (EV_A_ (W)w);
4275 if (expect_false (!ev_is_active (w)))
4281 int active = ev_active (w);
4283 forks [active - 1] = forks [--forkcnt];
4284 ev_active (forks [active - 1]) = active;
4287 ev_stop (EV_A_ (W)w);
4293 #if EV_CLEANUP_ENABLE
4295 ev_cleanup_start (EV_P_ ev_cleanup *w) EV_THROW
4297 if (expect_false (ev_is_active (w)))
4302 ev_start (EV_A_ (W)w, ++cleanupcnt);
4303 array_needsize (ev_cleanup *, cleanups, cleanupmax, cleanupcnt, EMPTY2);
4304 cleanups [cleanupcnt - 1] = w;
4306 /* cleanup watchers should never keep a refcount on the loop */
4312 ev_cleanup_stop (EV_P_ ev_cleanup *w) EV_THROW
4314 clear_pending (EV_A_ (W)w);
4315 if (expect_false (!ev_is_active (w)))
4322 int active = ev_active (w);
4324 cleanups [active - 1] = cleanups [--cleanupcnt];
4325 ev_active (cleanups [active - 1]) = active;
4328 ev_stop (EV_A_ (W)w);
4336 ev_async_start (EV_P_ ev_async *w) EV_THROW
4338 if (expect_false (ev_is_active (w)))
4347 ev_start (EV_A_ (W)w, ++asynccnt);
4348 array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
4349 asyncs [asynccnt - 1] = w;
4355 ev_async_stop (EV_P_ ev_async *w) EV_THROW
4357 clear_pending (EV_A_ (W)w);
4358 if (expect_false (!ev_is_active (w)))
4364 int active = ev_active (w);
4366 asyncs [active - 1] = asyncs [--asynccnt];
4367 ev_active (asyncs [active - 1]) = active;
4370 ev_stop (EV_A_ (W)w);
4376 ev_async_send (EV_P_ ev_async *w) EV_THROW
4379 evpipe_write (EV_A_ &async_pending);
4383 /*****************************************************************************/
4389 void (*cb)(int revents, void *arg);
4394 once_cb (EV_P_ struct ev_once *once, int revents)
4396 void (*cb)(int revents, void *arg) = once->cb;
4397 void *arg = once->arg;
4399 ev_io_stop (EV_A_ &once->io);
4400 ev_timer_stop (EV_A_ &once->to);
4407 once_cb_io (EV_P_ ev_io *w, int revents)
4409 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io));
4411 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->to));
4415 once_cb_to (EV_P_ ev_timer *w, int revents)
4417 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to));
4419 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->io));
4423 ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg) EV_THROW
4425 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
4427 if (expect_false (!once))
4429 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMER, arg);
4436 ev_init (&once->io, once_cb_io);
4439 ev_io_set (&once->io, fd, events);
4440 ev_io_start (EV_A_ &once->io);
4443 ev_init (&once->to, once_cb_to);
4446 ev_timer_set (&once->to, timeout, 0.);
4447 ev_timer_start (EV_A_ &once->to);
4451 /*****************************************************************************/
4455 ev_walk (EV_P_ int types, void (*cb)(EV_P_ int type, void *w)) EV_THROW
4458 ev_watcher_list *wl, *wn;
4460 if (types & (EV_IO | EV_EMBED))
4461 for (i = 0; i < anfdmax; ++i)
4462 for (wl = anfds [i].head; wl; )
4467 if (ev_cb ((ev_io *)wl) == embed_io_cb)
4469 if (types & EV_EMBED)
4470 cb (EV_A_ EV_EMBED, ((char *)wl) - offsetof (struct ev_embed, io));
4475 if (ev_cb ((ev_io *)wl) == infy_cb)
4479 if ((ev_io *)wl != &pipe_w)
4481 cb (EV_A_ EV_IO, wl);
4486 if (types & (EV_TIMER | EV_STAT))
4487 for (i = timercnt + HEAP0; i-- > HEAP0; )
4489 /*TODO: timer is not always active*/
4490 if (ev_cb ((ev_timer *)ANHE_w (timers [i])) == stat_timer_cb)
4492 if (types & EV_STAT)
4493 cb (EV_A_ EV_STAT, ((char *)ANHE_w (timers [i])) - offsetof (struct ev_stat, timer));
4497 if (types & EV_TIMER)
4498 cb (EV_A_ EV_TIMER, ANHE_w (timers [i]));
4500 #if EV_PERIODIC_ENABLE
4501 if (types & EV_PERIODIC)
4502 for (i = periodiccnt + HEAP0; i-- > HEAP0; )
4503 cb (EV_A_ EV_PERIODIC, ANHE_w (periodics [i]));
4507 if (types & EV_IDLE)
4508 for (j = NUMPRI; j--; )
4509 for (i = idlecnt [j]; i--; )
4510 cb (EV_A_ EV_IDLE, idles [j][i]);
4514 if (types & EV_FORK)
4515 for (i = forkcnt; i--; )
4516 if (ev_cb (forks [i]) != embed_fork_cb)
4517 cb (EV_A_ EV_FORK, forks [i]);
4521 if (types & EV_ASYNC)
4522 for (i = asynccnt; i--; )
4523 cb (EV_A_ EV_ASYNC, asyncs [i]);
4526 #if EV_PREPARE_ENABLE
4527 if (types & EV_PREPARE)
4528 for (i = preparecnt; i--; )
4529 # if EV_EMBED_ENABLE
4530 if (ev_cb (prepares [i]) != embed_prepare_cb)
4532 cb (EV_A_ EV_PREPARE, prepares [i]);
4536 if (types & EV_CHECK)
4537 for (i = checkcnt; i--; )
4538 cb (EV_A_ EV_CHECK, checks [i]);
4541 #if EV_SIGNAL_ENABLE
4542 if (types & EV_SIGNAL)
4543 for (i = 0; i < EV_NSIG - 1; ++i)
4544 for (wl = signals [i].head; wl; )
4547 cb (EV_A_ EV_SIGNAL, wl);
4553 if (types & EV_CHILD)
4554 for (i = (EV_PID_HASHSIZE); i--; )
4555 for (wl = childs [i]; wl; )
4558 cb (EV_A_ EV_CHILD, wl);
4562 /* EV_STAT 0x00001000 /* stat data changed */
4563 /* EV_EMBED 0x00010000 /* embedded event loop needs sweep */
4568 #include "ev_wrap.h"