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 <windows.h>
207 # include <winsock2.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
416 #if EV_SELECT_IS_WINSOCKET
417 # include <winsock.h>
421 /* our minimum requirement is glibc 2.7 which has the stub, but not the header */
423 # ifndef EFD_NONBLOCK
424 # define EFD_NONBLOCK O_NONBLOCK
428 # define EFD_CLOEXEC O_CLOEXEC
430 # define EFD_CLOEXEC 02000000
433 EV_CPP(extern "C") int (eventfd) (unsigned int initval, int flags);
437 /* our minimum requirement is glibc 2.7 which has the stub, but not the header */
439 # ifndef SFD_NONBLOCK
440 # define SFD_NONBLOCK O_NONBLOCK
444 # define SFD_CLOEXEC O_CLOEXEC
446 # define SFD_CLOEXEC 02000000
449 EV_CPP (extern "C") int signalfd (int fd, const sigset_t *mask, int flags);
451 struct signalfd_siginfo
454 char pad[128 - sizeof (uint32_t)];
461 # define EV_FREQUENT_CHECK ev_verify (EV_A)
463 # define EV_FREQUENT_CHECK do { } while (0)
467 * This is used to work around floating point rounding problems.
468 * This value is good at least till the year 4000.
470 #define MIN_INTERVAL 0.0001220703125 /* 1/2**13, good till 4000 */
471 /*#define MIN_INTERVAL 0.00000095367431640625 /* 1/2**20, good till 2200 */
473 #define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
474 #define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
476 #define EV_TV_SET(tv,t) do { tv.tv_sec = (long)t; tv.tv_usec = (long)((t - tv.tv_sec) * 1e6); } while (0)
477 #define EV_TS_SET(ts,t) do { ts.tv_sec = (long)t; ts.tv_nsec = (long)((t - ts.tv_sec) * 1e9); } while (0)
479 /* the following is ecb.h embedded into libev - use update_ev_c to update from an external copy */
482 * libecb - http://software.schmorp.de/pkg/libecb
484 * Copyright (©) 2009-2012 Marc Alexander Lehmann <libecb@schmorp.de>
485 * Copyright (©) 2011 Emanuele Giaquinta
486 * All rights reserved.
488 * Redistribution and use in source and binary forms, with or without modifica-
489 * tion, are permitted provided that the following conditions are met:
491 * 1. Redistributions of source code must retain the above copyright notice,
492 * this list of conditions and the following disclaimer.
494 * 2. Redistributions in binary form must reproduce the above copyright
495 * notice, this list of conditions and the following disclaimer in the
496 * documentation and/or other materials provided with the distribution.
498 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
499 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
500 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
501 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
502 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
503 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
504 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
505 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
506 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
507 * OF THE POSSIBILITY OF SUCH DAMAGE.
514 typedef signed char int8_t;
515 typedef unsigned char uint8_t;
516 typedef signed short int16_t;
517 typedef unsigned short uint16_t;
518 typedef signed int int32_t;
519 typedef unsigned int uint32_t;
521 typedef signed long long int64_t;
522 typedef unsigned long long uint64_t;
523 #else /* _MSC_VER || __BORLANDC__ */
524 typedef signed __int64 int64_t;
525 typedef unsigned __int64 uint64_t;
528 #include <inttypes.h>
531 /* many compilers define _GNUC_ to some versions but then only implement
532 * what their idiot authors think are the "more important" extensions,
533 * causing enormous grief in return for some better fake benchmark numbers.
535 * we try to detect these and simply assume they are not gcc - if they have
536 * an issue with that they should have done it right in the first place.
538 #ifndef ECB_GCC_VERSION
539 #if !defined __GNUC_MINOR__ || defined __INTEL_COMPILER || defined __SUNPRO_C || defined __SUNPRO_CC || defined __llvm__ || defined __clang__
540 #define ECB_GCC_VERSION(major,minor) 0
542 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
546 /*****************************************************************************/
548 /* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
549 /* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
552 # define ECB_NO_SMP 1
555 #if ECB_NO_THREADS || ECB_NO_SMP
556 #define ECB_MEMORY_FENCE do { } while (0)
559 #ifndef ECB_MEMORY_FENCE
560 #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
561 #if __i386 || __i386__
562 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
563 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE /* non-lock xchg might be enough */
564 #define ECB_MEMORY_FENCE_RELEASE do { } while (0) /* unlikely to change in future cpus */
565 #elif __amd64 || __amd64__ || __x86_64 || __x86_64__
566 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
567 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("lfence" : : : "memory")
568 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("sfence") /* play safe - not needed in any current cpu */
569 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
570 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
571 #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \
572 || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__
573 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
574 #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \
575 || defined __ARM_ARCH_7M__ || defined __ARM_ARCH_7R__
576 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
577 #elif __sparc || __sparc__
578 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad | " : : : "memory")
579 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
580 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
581 #elif defined __s390__ || defined __s390x__
582 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
583 #elif defined __mips__
584 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
585 #elif defined __alpha__
586 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
591 #ifndef ECB_MEMORY_FENCE
592 #if ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
593 #define ECB_MEMORY_FENCE __sync_synchronize ()
594 /*#define ECB_MEMORY_FENCE_ACQUIRE ({ char dummy = 0; __sync_lock_test_and_set (&dummy, 1); }) */
595 /*#define ECB_MEMORY_FENCE_RELEASE ({ char dummy = 1; __sync_lock_release (&dummy ); }) */
596 #elif _MSC_VER >= 1400 /* VC++ 2005 */
597 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
598 #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
599 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
600 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
603 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
604 #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
605 #include <mbarrier.h>
606 #define ECB_MEMORY_FENCE __machine_rw_barrier ()
607 #define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier ()
608 #define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier ()
610 #define ECB_MEMORY_FENCE __sync ()
614 #ifndef ECB_MEMORY_FENCE
615 #if !ECB_AVOID_PTHREADS
617 * if you get undefined symbol references to pthread_mutex_lock,
618 * or failure to find pthread.h, then you should implement
619 * the ECB_MEMORY_FENCE operations for your cpu/compiler
620 * OR provide pthread.h and link against the posix thread library
624 #define ECB_NEEDS_PTHREADS 1
625 #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
627 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
628 #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
632 #if !defined ECB_MEMORY_FENCE_ACQUIRE && defined ECB_MEMORY_FENCE
633 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
636 #if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE
637 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
640 /*****************************************************************************/
642 #define ECB_C99 (__STDC_VERSION__ >= 199901L)
645 #define ecb_inline static inline
646 #elif ECB_GCC_VERSION(2,5)
647 #define ecb_inline static __inline__
649 #define ecb_inline static inline
651 #define ecb_inline static
654 #if ECB_GCC_VERSION(3,3)
655 #define ecb_restrict __restrict__
657 #define ecb_restrict restrict
662 typedef int ecb_bool;
664 #define ECB_CONCAT_(a, b) a ## b
665 #define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
666 #define ECB_STRINGIFY_(a) # a
667 #define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
669 #define ecb_function_ ecb_inline
671 #if ECB_GCC_VERSION(3,1)
672 #define ecb_attribute(attrlist) __attribute__(attrlist)
673 #define ecb_is_constant(expr) __builtin_constant_p (expr)
674 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
675 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
677 #define ecb_attribute(attrlist)
678 #define ecb_is_constant(expr) 0
679 #define ecb_expect(expr,value) (expr)
680 #define ecb_prefetch(addr,rw,locality)
683 /* no emulation for ecb_decltype */
684 #if ECB_GCC_VERSION(4,5)
685 #define ecb_decltype(x) __decltype(x)
686 #elif ECB_GCC_VERSION(3,0)
687 #define ecb_decltype(x) __typeof(x)
690 #define ecb_noinline ecb_attribute ((__noinline__))
691 #define ecb_noreturn ecb_attribute ((__noreturn__))
692 #define ecb_unused ecb_attribute ((__unused__))
693 #define ecb_const ecb_attribute ((__const__))
694 #define ecb_pure ecb_attribute ((__pure__))
696 #if ECB_GCC_VERSION(4,3)
697 #define ecb_artificial ecb_attribute ((__artificial__))
698 #define ecb_hot ecb_attribute ((__hot__))
699 #define ecb_cold ecb_attribute ((__cold__))
701 #define ecb_artificial
706 /* put around conditional expressions if you are very sure that the */
707 /* expression is mostly true or mostly false. note that these return */
708 /* booleans, not the expression. */
709 #define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
710 #define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
711 /* for compatibility to the rest of the world */
712 #define ecb_likely(expr) ecb_expect_true (expr)
713 #define ecb_unlikely(expr) ecb_expect_false (expr)
715 /* count trailing zero bits and count # of one bits */
716 #if ECB_GCC_VERSION(3,4)
717 /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
718 #define ecb_ld32(x) (__builtin_clz (x) ^ 31)
719 #define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
720 #define ecb_ctz32(x) __builtin_ctz (x)
721 #define ecb_ctz64(x) __builtin_ctzll (x)
722 #define ecb_popcount32(x) __builtin_popcount (x)
725 ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const;
727 ecb_ctz32 (uint32_t x)
731 x &= ~x + 1; /* this isolates the lowest bit */
733 #if ECB_branchless_on_i386
734 r += !!(x & 0xaaaaaaaa) << 0;
735 r += !!(x & 0xcccccccc) << 1;
736 r += !!(x & 0xf0f0f0f0) << 2;
737 r += !!(x & 0xff00ff00) << 3;
738 r += !!(x & 0xffff0000) << 4;
740 if (x & 0xaaaaaaaa) r += 1;
741 if (x & 0xcccccccc) r += 2;
742 if (x & 0xf0f0f0f0) r += 4;
743 if (x & 0xff00ff00) r += 8;
744 if (x & 0xffff0000) r += 16;
750 ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const;
752 ecb_ctz64 (uint64_t x)
754 int shift = x & 0xffffffffU ? 0 : 32;
755 return ecb_ctz32 (x >> shift) + shift;
758 ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const;
760 ecb_popcount32 (uint32_t x)
762 x -= (x >> 1) & 0x55555555;
763 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
764 x = ((x >> 4) + x) & 0x0f0f0f0f;
770 ecb_function_ int ecb_ld32 (uint32_t x) ecb_const;
771 ecb_function_ int ecb_ld32 (uint32_t x)
775 if (x >> 16) { x >>= 16; r += 16; }
776 if (x >> 8) { x >>= 8; r += 8; }
777 if (x >> 4) { x >>= 4; r += 4; }
778 if (x >> 2) { x >>= 2; r += 2; }
779 if (x >> 1) { r += 1; }
784 ecb_function_ int ecb_ld64 (uint64_t x) ecb_const;
785 ecb_function_ int ecb_ld64 (uint64_t x)
789 if (x >> 32) { x >>= 32; r += 32; }
791 return r + ecb_ld32 (x);
795 ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const;
796 ecb_function_ uint8_t ecb_bitrev8 (uint8_t x)
798 return ( (x * 0x0802U & 0x22110U)
799 | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
802 ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) ecb_const;
803 ecb_function_ uint16_t ecb_bitrev16 (uint16_t x)
805 x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1);
806 x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2);
807 x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4);
808 x = ( x >> 8 ) | ( x << 8);
813 ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) ecb_const;
814 ecb_function_ uint32_t ecb_bitrev32 (uint32_t x)
816 x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1);
817 x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2);
818 x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4);
819 x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8);
820 x = ( x >> 16 ) | ( x << 16);
825 /* popcount64 is only available on 64 bit cpus as gcc builtin */
826 /* so for this version we are lazy */
827 ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;
829 ecb_popcount64 (uint64_t x)
831 return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
834 ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const;
835 ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const;
836 ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const;
837 ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const;
838 ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
839 ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
840 ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const;
841 ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const;
843 ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }
844 ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }
845 ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }
846 ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }
847 ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
848 ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
849 ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
850 ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }
852 #if ECB_GCC_VERSION(4,3)
853 #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
854 #define ecb_bswap32(x) __builtin_bswap32 (x)
855 #define ecb_bswap64(x) __builtin_bswap64 (x)
857 ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const;
858 ecb_function_ uint16_t
859 ecb_bswap16 (uint16_t x)
861 return ecb_rotl16 (x, 8);
864 ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const;
865 ecb_function_ uint32_t
866 ecb_bswap32 (uint32_t x)
868 return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
871 ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const;
872 ecb_function_ uint64_t
873 ecb_bswap64 (uint64_t x)
875 return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
879 #if ECB_GCC_VERSION(4,5)
880 #define ecb_unreachable() __builtin_unreachable ()
882 /* this seems to work fine, but gcc always emits a warning for it :/ */
883 ecb_inline void ecb_unreachable (void) ecb_noreturn;
884 ecb_inline void ecb_unreachable (void) { }
887 /* try to tell the compiler that some condition is definitely true */
888 #define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
890 ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const;
891 ecb_inline unsigned char
892 ecb_byteorder_helper (void)
894 const uint32_t u = 0x11223344;
895 return *(unsigned char *)&u;
898 ecb_inline ecb_bool ecb_big_endian (void) ecb_const;
899 ecb_inline ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
900 ecb_inline ecb_bool ecb_little_endian (void) ecb_const;
901 ecb_inline ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
903 #if ECB_GCC_VERSION(3,0) || ECB_C99
904 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
906 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
911 static inline T ecb_div_rd (T val, T div)
913 return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
916 static inline T ecb_div_ru (T val, T div)
918 return val < 0 ? - ((-val ) / div) : (val + div - 1) / div;
921 #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
922 #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
925 #if ecb_cplusplus_does_not_suck
926 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
927 template<typename T, int N>
928 static inline int ecb_array_length (const T (&arr)[N])
933 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
940 #if ECB_MEMORY_FENCE_NEEDS_PTHREADS
941 /* if your architecture doesn't need memory fences, e.g. because it is
942 * single-cpu/core, or if you use libev in a project that doesn't use libev
943 * from multiple threads, then you can define ECB_AVOID_PTHREADS when compiling
944 * libev, in which cases the memory fences become nops.
945 * alternatively, you can remove this #error and link against libpthread,
946 * which will then provide the memory fences.
948 # error "memory fences not defined for your architecture, please report"
951 #ifndef ECB_MEMORY_FENCE
952 # define ECB_MEMORY_FENCE do { } while (0)
953 # define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
954 # define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
957 #define expect_false(cond) ecb_expect_false (cond)
958 #define expect_true(cond) ecb_expect_true (cond)
959 #define noinline ecb_noinline
961 #define inline_size ecb_inline
964 # define inline_speed ecb_inline
966 # define inline_speed static noinline
969 #define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
971 #if EV_MINPRI == EV_MAXPRI
972 # define ABSPRI(w) (((W)w), 0)
974 # define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
977 #define EMPTY /* required for microsofts broken pseudo-c compiler */
978 #define EMPTY2(a,b) /* used to suppress some warnings */
980 typedef ev_watcher *W;
981 typedef ev_watcher_list *WL;
982 typedef ev_watcher_time *WT;
984 #define ev_active(w) ((W)(w))->active
985 #define ev_at(w) ((WT)(w))->at
988 /* sig_atomic_t is used to avoid per-thread variables or locking but still */
989 /* giving it a reasonably high chance of working on typical architectures */
990 static EV_ATOMIC_T have_realtime; /* did clock_gettime (CLOCK_REALTIME) work? */
994 static EV_ATOMIC_T have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
997 #ifndef EV_FD_TO_WIN32_HANDLE
998 # define EV_FD_TO_WIN32_HANDLE(fd) _get_osfhandle (fd)
1000 #ifndef EV_WIN32_HANDLE_TO_FD
1001 # define EV_WIN32_HANDLE_TO_FD(handle) _open_osfhandle (handle, 0)
1003 #ifndef EV_WIN32_CLOSE_FD
1004 # define EV_WIN32_CLOSE_FD(fd) close (fd)
1008 # include "ev_win32.c"
1011 /*****************************************************************************/
1013 /* define a suitable floor function (only used by periodics atm) */
1017 # define ev_floor(v) floor (v)
1022 /* a floor() replacement function, should be independent of ev_tstamp type */
1023 static ev_tstamp noinline
1024 ev_floor (ev_tstamp v)
1026 /* the choice of shift factor is not terribly important */
1027 #if FLT_RADIX != 2 /* assume FLT_RADIX == 10 */
1028 const ev_tstamp shift = sizeof (unsigned long) >= 8 ? 10000000000000000000. : 1000000000.;
1030 const ev_tstamp shift = sizeof (unsigned long) >= 8 ? 18446744073709551616. : 4294967296.;
1033 /* argument too large for an unsigned long? */
1034 if (expect_false (v >= shift))
1039 return v; /* very large number */
1041 f = shift * ev_floor (v * (1. / shift));
1042 return f + ev_floor (v - f);
1045 /* special treatment for negative args? */
1046 if (expect_false (v < 0.))
1048 ev_tstamp f = -ev_floor (-v);
1050 return f - (f == v ? 0 : 1);
1053 /* fits into an unsigned long */
1054 return (unsigned long)v;
1059 /*****************************************************************************/
1062 # include <sys/utsname.h>
1065 static unsigned int noinline ecb_cold
1066 ev_linux_version (void)
1072 char *p = buf.release;
1077 for (i = 3+1; --i; )
1083 if (*p >= '0' && *p <= '9')
1084 c = c * 10 + *p++ - '0';
1101 /*****************************************************************************/
1104 static void noinline ecb_cold
1105 ev_printerr (const char *msg)
1107 write (STDERR_FILENO, msg, strlen (msg));
1111 static void (*syserr_cb)(const char *msg) EV_THROW;
1114 ev_set_syserr_cb (void (*cb)(const char *msg)) EV_THROW
1119 static void noinline ecb_cold
1120 ev_syserr (const char *msg)
1123 msg = "(libev) system error";
1132 ev_printerr (strerror (errno));
1142 ev_realloc_emul (void *ptr, long size)
1145 return realloc (ptr, size);
1147 /* some systems, notably openbsd and darwin, fail to properly
1148 * implement realloc (x, 0) (as required by both ansi c-89 and
1149 * the single unix specification, so work around them here.
1153 return realloc (ptr, size);
1160 static void *(*alloc)(void *ptr, long size) EV_THROW = ev_realloc_emul;
1163 ev_set_allocator (void *(*cb)(void *ptr, long size)) EV_THROW
1169 ev_realloc (void *ptr, long size)
1171 ptr = alloc (ptr, size);
1176 ev_printerr ("(libev) memory allocation failed, aborting.\n");
1178 fprintf (stderr, "(libev) cannot allocate %ld bytes, aborting.", size);
1186 #define ev_malloc(size) ev_realloc (0, (size))
1187 #define ev_free(ptr) ev_realloc ((ptr), 0)
1189 /*****************************************************************************/
1191 /* set in reify when reification needed */
1192 #define EV_ANFD_REIFY 1
1194 /* file descriptor info structure */
1198 unsigned char events; /* the events watched for */
1199 unsigned char reify; /* flag set when this ANFD needs reification (EV_ANFD_REIFY, EV__IOFDSET) */
1200 unsigned char emask; /* the epoll backend stores the actual kernel mask in here */
1201 unsigned char unused;
1203 unsigned int egen; /* generation counter to counter epoll bugs */
1205 #if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
1213 /* stores the pending event set for a given watcher */
1217 int events; /* the pending event set for the given watcher */
1221 /* hash table entry per inotify-id */
1229 #if EV_HEAP_CACHE_AT
1230 /* a heap element */
1236 #define ANHE_w(he) (he).w /* access watcher, read-write */
1237 #define ANHE_at(he) (he).at /* access cached at, read-only */
1238 #define ANHE_at_cache(he) (he).at = (he).w->at /* update at from watcher */
1240 /* a heap element */
1243 #define ANHE_w(he) (he)
1244 #define ANHE_at(he) (he)->at
1245 #define ANHE_at_cache(he)
1252 ev_tstamp ev_rt_now;
1253 #define ev_rt_now ((loop)->ev_rt_now)
1254 #define VAR(name,decl) decl;
1255 #include "ev_vars.h"
1258 #include "ev_wrap.h"
1260 static struct ev_loop default_loop_struct;
1261 EV_API_DECL struct ev_loop *ev_default_loop_ptr = 0; /* needs to be initialised to make it a definition despite extern */
1265 EV_API_DECL ev_tstamp ev_rt_now = 0; /* needs to be initialised to make it a definition despite extern */
1266 #define VAR(name,decl) static decl;
1267 #include "ev_vars.h"
1270 static int ev_default_loop_ptr;
1275 # define EV_RELEASE_CB if (expect_false (release_cb)) release_cb (EV_A)
1276 # define EV_ACQUIRE_CB if (expect_false (acquire_cb)) acquire_cb (EV_A)
1277 # define EV_INVOKE_PENDING invoke_cb (EV_A)
1279 # define EV_RELEASE_CB (void)0
1280 # define EV_ACQUIRE_CB (void)0
1281 # define EV_INVOKE_PENDING ev_invoke_pending (EV_A)
1284 #define EVBREAK_RECURSE 0x80
1286 /*****************************************************************************/
1288 #ifndef EV_HAVE_EV_TIME
1290 ev_time (void) EV_THROW
1293 if (expect_true (have_realtime))
1296 clock_gettime (CLOCK_REALTIME, &ts);
1297 return ts.tv_sec + ts.tv_nsec * 1e-9;
1302 gettimeofday (&tv, 0);
1303 return tv.tv_sec + tv.tv_usec * 1e-6;
1307 inline_size ev_tstamp
1310 #if EV_USE_MONOTONIC
1311 if (expect_true (have_monotonic))
1314 clock_gettime (CLOCK_MONOTONIC, &ts);
1315 return ts.tv_sec + ts.tv_nsec * 1e-9;
1324 ev_now (EV_P) EV_THROW
1331 ev_sleep (ev_tstamp delay) EV_THROW
1335 #if EV_USE_NANOSLEEP
1338 EV_TS_SET (ts, delay);
1340 #elif defined _WIN32
1341 Sleep ((unsigned long)(delay * 1e3));
1345 /* here we rely on sys/time.h + sys/types.h + unistd.h providing select */
1346 /* something not guaranteed by newer posix versions, but guaranteed */
1348 EV_TV_SET (tv, delay);
1349 select (0, 0, 0, 0, &tv);
1354 /*****************************************************************************/
1356 #define MALLOC_ROUND 4096 /* prefer to allocate in chunks of this size, must be 2**n and >> 4 longs */
1358 /* find a suitable new size for the given array, */
1359 /* hopefully by rounding to a nice-to-malloc size */
1361 array_nextsize (int elem, int cur, int cnt)
1369 /* if size is large, round to MALLOC_ROUND - 4 * longs to accommodate malloc overhead */
1370 if (elem * ncur > MALLOC_ROUND - sizeof (void *) * 4)
1373 ncur = (ncur + elem + (MALLOC_ROUND - 1) + sizeof (void *) * 4) & ~(MALLOC_ROUND - 1);
1374 ncur = ncur - sizeof (void *) * 4;
1381 static void * noinline ecb_cold
1382 array_realloc (int elem, void *base, int *cur, int cnt)
1384 *cur = array_nextsize (elem, *cur, cnt);
1385 return ev_realloc (base, elem * *cur);
1388 #define array_init_zero(base,count) \
1389 memset ((void *)(base), 0, sizeof (*(base)) * (count))
1391 #define array_needsize(type,base,cur,cnt,init) \
1392 if (expect_false ((cnt) > (cur))) \
1394 int ecb_unused ocur_ = (cur); \
1395 (base) = (type *)array_realloc \
1396 (sizeof (type), (base), &(cur), (cnt)); \
1397 init ((base) + (ocur_), (cur) - ocur_); \
1401 #define array_slim(type,stem) \
1402 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
1404 stem ## max = array_roundsize (stem ## cnt >> 1); \
1405 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
1406 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
1410 #define array_free(stem, idx) \
1411 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0; stem ## s idx = 0
1413 /*****************************************************************************/
1415 /* dummy callback for pending events */
1416 static void noinline
1417 pendingcb (EV_P_ ev_prepare *w, int revents)
1422 ev_feed_event (EV_P_ void *w, int revents) EV_THROW
1425 int pri = ABSPRI (w_);
1427 if (expect_false (w_->pending))
1428 pendings [pri][w_->pending - 1].events |= revents;
1431 w_->pending = ++pendingcnt [pri];
1432 array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
1433 pendings [pri][w_->pending - 1].w = w_;
1434 pendings [pri][w_->pending - 1].events = revents;
1437 pendingpri = NUMPRI - 1;
1441 feed_reverse (EV_P_ W w)
1443 array_needsize (W, rfeeds, rfeedmax, rfeedcnt + 1, EMPTY2);
1444 rfeeds [rfeedcnt++] = w;
1448 feed_reverse_done (EV_P_ int revents)
1451 ev_feed_event (EV_A_ rfeeds [--rfeedcnt], revents);
1456 queue_events (EV_P_ W *events, int eventcnt, int type)
1460 for (i = 0; i < eventcnt; ++i)
1461 ev_feed_event (EV_A_ events [i], type);
1464 /*****************************************************************************/
1467 fd_event_nocheck (EV_P_ int fd, int revents)
1469 ANFD *anfd = anfds + fd;
1472 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
1474 int ev = w->events & revents;
1477 ev_feed_event (EV_A_ (W)w, ev);
1481 /* do not submit kernel events for fds that have reify set */
1482 /* because that means they changed while we were polling for new events */
1484 fd_event (EV_P_ int fd, int revents)
1486 ANFD *anfd = anfds + fd;
1488 if (expect_true (!anfd->reify))
1489 fd_event_nocheck (EV_A_ fd, revents);
1493 ev_feed_fd_event (EV_P_ int fd, int revents) EV_THROW
1495 if (fd >= 0 && fd < anfdmax)
1496 fd_event_nocheck (EV_A_ fd, revents);
1499 /* make sure the external fd watch events are in-sync */
1500 /* with the kernel/libev internal state */
1506 #if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
1507 for (i = 0; i < fdchangecnt; ++i)
1509 int fd = fdchanges [i];
1510 ANFD *anfd = anfds + fd;
1512 if (anfd->reify & EV__IOFDSET && anfd->head)
1514 SOCKET handle = EV_FD_TO_WIN32_HANDLE (fd);
1516 if (handle != anfd->handle)
1520 assert (("libev: only socket fds supported in this configuration", ioctlsocket (handle, FIONREAD, &arg) == 0));
1522 /* handle changed, but fd didn't - we need to do it in two steps */
1523 backend_modify (EV_A_ fd, anfd->events, 0);
1525 anfd->handle = handle;
1531 for (i = 0; i < fdchangecnt; ++i)
1533 int fd = fdchanges [i];
1534 ANFD *anfd = anfds + fd;
1537 unsigned char o_events = anfd->events;
1538 unsigned char o_reify = anfd->reify;
1542 /*if (expect_true (o_reify & EV_ANFD_REIFY)) probably a deoptimisation */
1546 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
1547 anfd->events |= (unsigned char)w->events;
1549 if (o_events != anfd->events)
1550 o_reify = EV__IOFDSET; /* actually |= */
1553 if (o_reify & EV__IOFDSET)
1554 backend_modify (EV_A_ fd, o_events, anfd->events);
1560 /* something about the given fd changed */
1562 fd_change (EV_P_ int fd, int flags)
1564 unsigned char reify = anfds [fd].reify;
1565 anfds [fd].reify |= flags;
1567 if (expect_true (!reify))
1570 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
1571 fdchanges [fdchangecnt - 1] = fd;
1575 /* the given fd is invalid/unusable, so make sure it doesn't hurt us anymore */
1576 inline_speed void ecb_cold
1577 fd_kill (EV_P_ int fd)
1581 while ((w = (ev_io *)anfds [fd].head))
1583 ev_io_stop (EV_A_ w);
1584 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
1588 /* check whether the given fd is actually valid, for error recovery */
1589 inline_size int ecb_cold
1593 return EV_FD_TO_WIN32_HANDLE (fd) != -1;
1595 return fcntl (fd, F_GETFD) != -1;
1599 /* called on EBADF to verify fds */
1600 static void noinline ecb_cold
1605 for (fd = 0; fd < anfdmax; ++fd)
1606 if (anfds [fd].events)
1607 if (!fd_valid (fd) && errno == EBADF)
1611 /* called on ENOMEM in select/poll to kill some fds and retry */
1612 static void noinline ecb_cold
1617 for (fd = anfdmax; fd--; )
1618 if (anfds [fd].events)
1625 /* usually called after fork if backend needs to re-arm all fds from scratch */
1626 static void noinline
1631 for (fd = 0; fd < anfdmax; ++fd)
1632 if (anfds [fd].events)
1634 anfds [fd].events = 0;
1635 anfds [fd].emask = 0;
1636 fd_change (EV_A_ fd, EV__IOFDSET | EV_ANFD_REIFY);
1640 /* used to prepare libev internal fd's */
1641 /* this is not fork-safe */
1646 unsigned long arg = 1;
1647 ioctlsocket (EV_FD_TO_WIN32_HANDLE (fd), FIONBIO, &arg);
1649 fcntl (fd, F_SETFD, FD_CLOEXEC);
1650 fcntl (fd, F_SETFL, O_NONBLOCK);
1654 /*****************************************************************************/
1657 * the heap functions want a real array index. array index 0 is guaranteed to not
1658 * be in-use at any time. the first heap entry is at array [HEAP0]. DHEAP gives
1659 * the branching factor of the d-tree.
1663 * at the moment we allow libev the luxury of two heaps,
1664 * a small-code-size 2-heap one and a ~1.5kb larger 4-heap
1665 * which is more cache-efficient.
1666 * the difference is about 5% with 50000+ watchers.
1671 #define HEAP0 (DHEAP - 1) /* index of first element in heap */
1672 #define HPARENT(k) ((((k) - HEAP0 - 1) / DHEAP) + HEAP0)
1673 #define UPHEAP_DONE(p,k) ((p) == (k))
1675 /* away from the root */
1677 downheap (ANHE *heap, int N, int k)
1680 ANHE *E = heap + N + HEAP0;
1686 ANHE *pos = heap + DHEAP * (k - HEAP0) + HEAP0 + 1;
1688 /* find minimum child */
1689 if (expect_true (pos + DHEAP - 1 < E))
1691 /* fast path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1692 if ( ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1693 if ( ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1694 if ( ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1698 /* slow path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1699 if (pos + 1 < E && ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1700 if (pos + 2 < E && ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1701 if (pos + 3 < E && ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1706 if (ANHE_at (he) <= minat)
1710 ev_active (ANHE_w (*minpos)) = k;
1716 ev_active (ANHE_w (he)) = k;
1722 #define HPARENT(k) ((k) >> 1)
1723 #define UPHEAP_DONE(p,k) (!(p))
1725 /* away from the root */
1727 downheap (ANHE *heap, int N, int k)
1738 c += c + 1 < N + HEAP0 && ANHE_at (heap [c]) > ANHE_at (heap [c + 1])
1741 if (ANHE_at (he) <= ANHE_at (heap [c]))
1744 heap [k] = heap [c];
1745 ev_active (ANHE_w (heap [k])) = k;
1751 ev_active (ANHE_w (he)) = k;
1755 /* towards the root */
1757 upheap (ANHE *heap, int k)
1763 int p = HPARENT (k);
1765 if (UPHEAP_DONE (p, k) || ANHE_at (heap [p]) <= ANHE_at (he))
1768 heap [k] = heap [p];
1769 ev_active (ANHE_w (heap [k])) = k;
1774 ev_active (ANHE_w (he)) = k;
1777 /* move an element suitably so it is in a correct place */
1779 adjustheap (ANHE *heap, int N, int k)
1781 if (k > HEAP0 && ANHE_at (heap [k]) <= ANHE_at (heap [HPARENT (k)]))
1784 downheap (heap, N, k);
1787 /* rebuild the heap: this function is used only once and executed rarely */
1789 reheap (ANHE *heap, int N)
1793 /* we don't use floyds algorithm, upheap is simpler and is more cache-efficient */
1794 /* also, this is easy to implement and correct for both 2-heaps and 4-heaps */
1795 for (i = 0; i < N; ++i)
1796 upheap (heap, i + HEAP0);
1799 /*****************************************************************************/
1801 /* associate signal watchers to a signal signal */
1804 EV_ATOMIC_T pending;
1811 static ANSIG signals [EV_NSIG - 1];
1813 /*****************************************************************************/
1815 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
1817 static void noinline ecb_cold
1820 if (!ev_is_active (&pipe_w))
1823 evfd = eventfd (0, EFD_NONBLOCK | EFD_CLOEXEC);
1824 if (evfd < 0 && errno == EINVAL)
1825 evfd = eventfd (0, 0);
1830 fd_intern (evfd); /* doing it twice doesn't hurt */
1831 ev_io_set (&pipe_w, evfd, EV_READ);
1836 while (pipe (evpipe))
1837 ev_syserr ("(libev) error creating signal/async pipe");
1839 fd_intern (evpipe [0]);
1840 fd_intern (evpipe [1]);
1841 ev_io_set (&pipe_w, evpipe [0], EV_READ);
1844 ev_io_start (EV_A_ &pipe_w);
1845 ev_unref (EV_A); /* watcher should not keep loop alive */
1850 evpipe_write (EV_P_ EV_ATOMIC_T *flag)
1852 ECB_MEMORY_FENCE; /* push out the write before this function was called, acquire flag */
1854 if (expect_true (*flag))
1859 ECB_MEMORY_FENCE_RELEASE; /* make sure flag is visible before the wakeup */
1861 pipe_write_skipped = 1;
1863 ECB_MEMORY_FENCE; /* make sure pipe_write_skipped is visible before we check pipe_write_wanted */
1865 if (pipe_write_wanted)
1869 pipe_write_skipped = 0; /* just an optimisation, no fence needed */
1871 old_errno = errno; /* save errno because write will clobber it */
1876 uint64_t counter = 1;
1877 write (evfd, &counter, sizeof (uint64_t));
1887 WSASend (EV_FD_TO_WIN32_HANDLE (evpipe [1]), &buf, 1, &sent, 0, 0, 0);
1889 write (evpipe [1], &(evpipe [1]), 1);
1897 /* called whenever the libev signal pipe */
1898 /* got some events (signal, async) */
1900 pipecb (EV_P_ ev_io *iow, int revents)
1904 if (revents & EV_READ)
1910 read (evfd, &counter, sizeof (uint64_t));
1920 buf.len = sizeof (dummy);
1921 WSARecv (EV_FD_TO_WIN32_HANDLE (evpipe [0]), &buf, 1, &recvd, 0, 0, 0);
1923 read (evpipe [0], &dummy, sizeof (dummy));
1928 pipe_write_skipped = 0;
1930 ECB_MEMORY_FENCE; /* push out skipped, acquire flags */
1932 #if EV_SIGNAL_ENABLE
1937 ECB_MEMORY_FENCE_RELEASE;
1939 for (i = EV_NSIG - 1; i--; )
1940 if (expect_false (signals [i].pending))
1941 ev_feed_signal_event (EV_A_ i + 1);
1950 ECB_MEMORY_FENCE_RELEASE;
1952 for (i = asynccnt; i--; )
1953 if (asyncs [i]->sent)
1955 asyncs [i]->sent = 0;
1956 ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
1962 /*****************************************************************************/
1965 ev_feed_signal (int signum) EV_THROW
1968 EV_P = signals [signum - 1].loop;
1974 if (!ev_active (&pipe_w))
1977 signals [signum - 1].pending = 1;
1978 evpipe_write (EV_A_ &sig_pending);
1982 ev_sighandler (int signum)
1985 signal (signum, ev_sighandler);
1988 ev_feed_signal (signum);
1992 ev_feed_signal_event (EV_P_ int signum) EV_THROW
1996 if (expect_false (signum <= 0 || signum > EV_NSIG))
2002 /* it is permissible to try to feed a signal to the wrong loop */
2003 /* or, likely more useful, feeding a signal nobody is waiting for */
2005 if (expect_false (signals [signum].loop != EV_A))
2009 signals [signum].pending = 0;
2011 for (w = signals [signum].head; w; w = w->next)
2012 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
2017 sigfdcb (EV_P_ ev_io *iow, int revents)
2019 struct signalfd_siginfo si[2], *sip; /* these structs are big */
2023 ssize_t res = read (sigfd, si, sizeof (si));
2025 /* not ISO-C, as res might be -1, but works with SuS */
2026 for (sip = si; (char *)sip < (char *)si + res; ++sip)
2027 ev_feed_signal_event (EV_A_ sip->ssi_signo);
2029 if (res < (ssize_t)sizeof (si))
2037 /*****************************************************************************/
2040 static WL childs [EV_PID_HASHSIZE];
2042 static ev_signal childev;
2044 #ifndef WIFCONTINUED
2045 # define WIFCONTINUED(status) 0
2048 /* handle a single child status event */
2050 child_reap (EV_P_ int chain, int pid, int status)
2053 int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
2055 for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next)
2057 if ((w->pid == pid || !w->pid)
2058 && (!traced || (w->flags & 1)))
2060 ev_set_priority (w, EV_MAXPRI); /* need to do it *now*, this *must* be the same prio as the signal watcher itself */
2062 w->rstatus = status;
2063 ev_feed_event (EV_A_ (W)w, EV_CHILD);
2069 # define WCONTINUED 0
2072 /* called on sigchld etc., calls waitpid */
2074 childcb (EV_P_ ev_signal *sw, int revents)
2078 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
2079 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
2082 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
2085 /* make sure we are called again until all children have been reaped */
2086 /* we need to do it this way so that the callback gets called before we continue */
2087 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
2089 child_reap (EV_A_ pid, pid, status);
2090 if ((EV_PID_HASHSIZE) > 1)
2091 child_reap (EV_A_ 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
2096 /*****************************************************************************/
2099 # include "ev_iocp.c"
2102 # include "ev_port.c"
2105 # include "ev_kqueue.c"
2108 # include "ev_epoll.c"
2111 # include "ev_poll.c"
2114 # include "ev_select.c"
2118 ev_version_major (void) EV_THROW
2120 return EV_VERSION_MAJOR;
2124 ev_version_minor (void) EV_THROW
2126 return EV_VERSION_MINOR;
2129 /* return true if we are running with elevated privileges and should ignore env variables */
2130 int inline_size ecb_cold
2131 enable_secure (void)
2136 return getuid () != geteuid ()
2137 || getgid () != getegid ();
2141 unsigned int ecb_cold
2142 ev_supported_backends (void) EV_THROW
2144 unsigned int flags = 0;
2146 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
2147 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
2148 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
2149 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
2150 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
2155 unsigned int ecb_cold
2156 ev_recommended_backends (void) EV_THROW
2158 unsigned int flags = ev_supported_backends ();
2161 /* kqueue is borked on everything but netbsd apparently */
2162 /* it usually doesn't work correctly on anything but sockets and pipes */
2163 flags &= ~EVBACKEND_KQUEUE;
2166 /* only select works correctly on that "unix-certified" platform */
2167 flags &= ~EVBACKEND_KQUEUE; /* horribly broken, even for sockets */
2168 flags &= ~EVBACKEND_POLL; /* poll is based on kqueue from 10.5 onwards */
2171 flags &= ~EVBACKEND_POLL; /* poll return value is unusable (http://forums.freebsd.org/archive/index.php/t-10270.html) */
2177 unsigned int ecb_cold
2178 ev_embeddable_backends (void) EV_THROW
2180 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
2182 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
2183 if (ev_linux_version () < 0x020620) /* disable it on linux < 2.6.32 */
2184 flags &= ~EVBACKEND_EPOLL;
2190 ev_backend (EV_P) EV_THROW
2197 ev_iteration (EV_P) EV_THROW
2203 ev_depth (EV_P) EV_THROW
2209 ev_set_io_collect_interval (EV_P_ ev_tstamp interval) EV_THROW
2211 io_blocktime = interval;
2215 ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval) EV_THROW
2217 timeout_blocktime = interval;
2221 ev_set_userdata (EV_P_ void *data) EV_THROW
2227 ev_userdata (EV_P) EV_THROW
2233 ev_set_invoke_pending_cb (EV_P_ void (*invoke_pending_cb)(EV_P)) EV_THROW
2235 invoke_cb = invoke_pending_cb;
2239 ev_set_loop_release_cb (EV_P_ void (*release)(EV_P) EV_THROW, void (*acquire)(EV_P) EV_THROW) EV_THROW
2241 release_cb = release;
2242 acquire_cb = acquire;
2246 /* initialise a loop structure, must be zero-initialised */
2247 static void noinline ecb_cold
2248 loop_init (EV_P_ unsigned int flags) EV_THROW
2259 if (!clock_gettime (CLOCK_REALTIME, &ts))
2264 #if EV_USE_MONOTONIC
2265 if (!have_monotonic)
2269 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
2274 /* pid check not overridable via env */
2276 if (flags & EVFLAG_FORKCHECK)
2280 if (!(flags & EVFLAG_NOENV)
2281 && !enable_secure ()
2282 && getenv ("LIBEV_FLAGS"))
2283 flags = atoi (getenv ("LIBEV_FLAGS"));
2285 ev_rt_now = ev_time ();
2286 mn_now = get_clock ();
2288 rtmn_diff = ev_rt_now - mn_now;
2290 invoke_cb = ev_invoke_pending;
2294 timeout_blocktime = 0.;
2301 pipe_write_skipped = 0;
2302 pipe_write_wanted = 0;
2304 fs_fd = flags & EVFLAG_NOINOTIFY ? -1 : -2;
2307 sigfd = flags & EVFLAG_SIGNALFD ? -2 : -1;
2310 if (!(flags & EVBACKEND_MASK))
2311 flags |= ev_recommended_backends ();
2314 if (!backend && (flags & EVBACKEND_IOCP )) backend = iocp_init (EV_A_ flags);
2317 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
2320 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
2323 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
2326 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
2329 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
2332 ev_prepare_init (&pending_w, pendingcb);
2334 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
2335 ev_init (&pipe_w, pipecb);
2336 ev_set_priority (&pipe_w, EV_MAXPRI);
2341 /* free up a loop structure */
2343 ev_loop_destroy (EV_P)
2348 /* mimic free (0) */
2353 #if EV_CLEANUP_ENABLE
2354 /* queue cleanup watchers (and execute them) */
2355 if (expect_false (cleanupcnt))
2357 queue_events (EV_A_ (W *)cleanups, cleanupcnt, EV_CLEANUP);
2363 if (ev_is_active (&childev))
2365 ev_ref (EV_A); /* child watcher */
2366 ev_signal_stop (EV_A_ &childev);
2370 if (ev_is_active (&pipe_w))
2373 /*ev_io_stop (EV_A_ &pipe_w);*/
2380 if (evpipe [0] >= 0)
2382 EV_WIN32_CLOSE_FD (evpipe [0]);
2383 EV_WIN32_CLOSE_FD (evpipe [1]);
2388 if (ev_is_active (&sigfd_w))
2397 if (backend_fd >= 0)
2401 if (backend == EVBACKEND_IOCP ) iocp_destroy (EV_A);
2404 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
2407 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
2410 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
2413 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
2416 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
2419 for (i = NUMPRI; i--; )
2421 array_free (pending, [i]);
2423 array_free (idle, [i]);
2427 ev_free (anfds); anfds = 0; anfdmax = 0;
2429 /* have to use the microsoft-never-gets-it-right macro */
2430 array_free (rfeed, EMPTY);
2431 array_free (fdchange, EMPTY);
2432 array_free (timer, EMPTY);
2433 #if EV_PERIODIC_ENABLE
2434 array_free (periodic, EMPTY);
2437 array_free (fork, EMPTY);
2439 #if EV_CLEANUP_ENABLE
2440 array_free (cleanup, EMPTY);
2442 array_free (prepare, EMPTY);
2443 array_free (check, EMPTY);
2445 array_free (async, EMPTY);
2451 if (ev_is_default_loop (EV_A))
2453 ev_default_loop_ptr = 0;
2461 inline_size void infy_fork (EV_P);
2468 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
2471 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
2474 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
2480 if (ev_is_active (&pipe_w))
2482 /* pipe_write_wanted must be false now, so modifying fd vars should be safe */
2485 ev_io_stop (EV_A_ &pipe_w);
2492 if (evpipe [0] >= 0)
2494 EV_WIN32_CLOSE_FD (evpipe [0]);
2495 EV_WIN32_CLOSE_FD (evpipe [1]);
2498 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
2500 /* now iterate over everything, in case we missed something */
2501 pipecb (EV_A_ &pipe_w, EV_READ);
2510 struct ev_loop * ecb_cold
2511 ev_loop_new (unsigned int flags) EV_THROW
2513 EV_P = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
2515 memset (EV_A, 0, sizeof (struct ev_loop));
2516 loop_init (EV_A_ flags);
2518 if (ev_backend (EV_A))
2525 #endif /* multiplicity */
2528 static void noinline ecb_cold
2529 verify_watcher (EV_P_ W w)
2531 assert (("libev: watcher has invalid priority", ABSPRI (w) >= 0 && ABSPRI (w) < NUMPRI));
2534 assert (("libev: pending watcher not on pending queue", pendings [ABSPRI (w)][w->pending - 1].w == w));
2537 static void noinline ecb_cold
2538 verify_heap (EV_P_ ANHE *heap, int N)
2542 for (i = HEAP0; i < N + HEAP0; ++i)
2544 assert (("libev: active index mismatch in heap", ev_active (ANHE_w (heap [i])) == i));
2545 assert (("libev: heap condition violated", i == HEAP0 || ANHE_at (heap [HPARENT (i)]) <= ANHE_at (heap [i])));
2546 assert (("libev: heap at cache mismatch", ANHE_at (heap [i]) == ev_at (ANHE_w (heap [i]))));
2548 verify_watcher (EV_A_ (W)ANHE_w (heap [i]));
2552 static void noinline ecb_cold
2553 array_verify (EV_P_ W *ws, int cnt)
2557 assert (("libev: active index mismatch", ev_active (ws [cnt]) == cnt + 1));
2558 verify_watcher (EV_A_ ws [cnt]);
2565 ev_verify (EV_P) EV_THROW
2571 assert (activecnt >= -1);
2573 assert (fdchangemax >= fdchangecnt);
2574 for (i = 0; i < fdchangecnt; ++i)
2575 assert (("libev: negative fd in fdchanges", fdchanges [i] >= 0));
2577 assert (anfdmax >= 0);
2578 for (i = 0; i < anfdmax; ++i)
2582 for (w = w2 = anfds [i].head; w; w = w->next)
2584 verify_watcher (EV_A_ (W)w);
2588 assert (("libev: io watcher list contains a loop", w != w2));
2592 assert (("libev: inactive fd watcher on anfd list", ev_active (w) == 1));
2593 assert (("libev: fd mismatch between watcher and anfd", ((ev_io *)w)->fd == i));
2597 assert (timermax >= timercnt);
2598 verify_heap (EV_A_ timers, timercnt);
2600 #if EV_PERIODIC_ENABLE
2601 assert (periodicmax >= periodiccnt);
2602 verify_heap (EV_A_ periodics, periodiccnt);
2605 for (i = NUMPRI; i--; )
2607 assert (pendingmax [i] >= pendingcnt [i]);
2609 assert (idleall >= 0);
2610 assert (idlemax [i] >= idlecnt [i]);
2611 array_verify (EV_A_ (W *)idles [i], idlecnt [i]);
2616 assert (forkmax >= forkcnt);
2617 array_verify (EV_A_ (W *)forks, forkcnt);
2620 #if EV_CLEANUP_ENABLE
2621 assert (cleanupmax >= cleanupcnt);
2622 array_verify (EV_A_ (W *)cleanups, cleanupcnt);
2626 assert (asyncmax >= asynccnt);
2627 array_verify (EV_A_ (W *)asyncs, asynccnt);
2630 #if EV_PREPARE_ENABLE
2631 assert (preparemax >= preparecnt);
2632 array_verify (EV_A_ (W *)prepares, preparecnt);
2636 assert (checkmax >= checkcnt);
2637 array_verify (EV_A_ (W *)checks, checkcnt);
2642 for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next)
2643 for (signum = EV_NSIG; signum--; ) if (signals [signum].pending)
2651 struct ev_loop * ecb_cold
2655 ev_default_loop (unsigned int flags) EV_THROW
2657 if (!ev_default_loop_ptr)
2660 EV_P = ev_default_loop_ptr = &default_loop_struct;
2662 ev_default_loop_ptr = 1;
2665 loop_init (EV_A_ flags);
2667 if (ev_backend (EV_A))
2670 ev_signal_init (&childev, childcb, SIGCHLD);
2671 ev_set_priority (&childev, EV_MAXPRI);
2672 ev_signal_start (EV_A_ &childev);
2673 ev_unref (EV_A); /* child watcher should not keep loop alive */
2677 ev_default_loop_ptr = 0;
2680 return ev_default_loop_ptr;
2684 ev_loop_fork (EV_P) EV_THROW
2686 postfork = 1; /* must be in line with ev_default_fork */
2689 /*****************************************************************************/
2692 ev_invoke (EV_P_ void *w, int revents)
2694 EV_CB_INVOKE ((W)w, revents);
2698 ev_pending_count (EV_P) EV_THROW
2701 unsigned int count = 0;
2703 for (pri = NUMPRI; pri--; )
2704 count += pendingcnt [pri];
2710 ev_invoke_pending (EV_P)
2712 for (pendingpri = NUMPRI; pendingpri--; ) /* pendingpri is modified during the loop */
2713 while (pendingcnt [pendingpri])
2715 ANPENDING *p = pendings [pendingpri] + --pendingcnt [pendingpri];
2718 EV_CB_INVOKE (p->w, p->events);
2724 /* make idle watchers pending. this handles the "call-idle */
2725 /* only when higher priorities are idle" logic */
2729 if (expect_false (idleall))
2733 for (pri = NUMPRI; pri--; )
2735 if (pendingcnt [pri])
2740 queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
2748 /* make timers pending */
2754 if (timercnt && ANHE_at (timers [HEAP0]) < mn_now)
2758 ev_timer *w = (ev_timer *)ANHE_w (timers [HEAP0]);
2760 /*assert (("libev: inactive timer on timer heap detected", ev_is_active (w)));*/
2762 /* first reschedule or stop timer */
2765 ev_at (w) += w->repeat;
2766 if (ev_at (w) < mn_now)
2769 assert (("libev: negative ev_timer repeat value found while processing timers", w->repeat > 0.));
2771 ANHE_at_cache (timers [HEAP0]);
2772 downheap (timers, timercnt, HEAP0);
2775 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
2778 feed_reverse (EV_A_ (W)w);
2780 while (timercnt && ANHE_at (timers [HEAP0]) < mn_now);
2782 feed_reverse_done (EV_A_ EV_TIMER);
2786 #if EV_PERIODIC_ENABLE
2788 static void noinline
2789 periodic_recalc (EV_P_ ev_periodic *w)
2791 ev_tstamp interval = w->interval > MIN_INTERVAL ? w->interval : MIN_INTERVAL;
2792 ev_tstamp at = w->offset + interval * ev_floor ((ev_rt_now - w->offset) / interval);
2794 /* the above almost always errs on the low side */
2795 while (at <= ev_rt_now)
2797 ev_tstamp nat = at + w->interval;
2799 /* when resolution fails us, we use ev_rt_now */
2800 if (expect_false (nat == at))
2812 /* make periodics pending */
2814 periodics_reify (EV_P)
2818 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now)
2824 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [HEAP0]);
2826 /*assert (("libev: inactive timer on periodic heap detected", ev_is_active (w)));*/
2828 /* first reschedule or stop timer */
2829 if (w->reschedule_cb)
2831 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2833 assert (("libev: ev_periodic reschedule callback returned time in the past", ev_at (w) >= ev_rt_now));
2835 ANHE_at_cache (periodics [HEAP0]);
2836 downheap (periodics, periodiccnt, HEAP0);
2838 else if (w->interval)
2840 periodic_recalc (EV_A_ w);
2841 ANHE_at_cache (periodics [HEAP0]);
2842 downheap (periodics, periodiccnt, HEAP0);
2845 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
2848 feed_reverse (EV_A_ (W)w);
2850 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now);
2852 feed_reverse_done (EV_A_ EV_PERIODIC);
2856 /* simply recalculate all periodics */
2857 /* TODO: maybe ensure that at least one event happens when jumping forward? */
2858 static void noinline ecb_cold
2859 periodics_reschedule (EV_P)
2863 /* adjust periodics after time jump */
2864 for (i = HEAP0; i < periodiccnt + HEAP0; ++i)
2866 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [i]);
2868 if (w->reschedule_cb)
2869 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2870 else if (w->interval)
2871 periodic_recalc (EV_A_ w);
2873 ANHE_at_cache (periodics [i]);
2876 reheap (periodics, periodiccnt);
2880 /* adjust all timers by a given offset */
2881 static void noinline ecb_cold
2882 timers_reschedule (EV_P_ ev_tstamp adjust)
2886 for (i = 0; i < timercnt; ++i)
2888 ANHE *he = timers + i + HEAP0;
2889 ANHE_w (*he)->at += adjust;
2890 ANHE_at_cache (*he);
2894 /* fetch new monotonic and realtime times from the kernel */
2895 /* also detect if there was a timejump, and act accordingly */
2897 time_update (EV_P_ ev_tstamp max_block)
2899 #if EV_USE_MONOTONIC
2900 if (expect_true (have_monotonic))
2903 ev_tstamp odiff = rtmn_diff;
2905 mn_now = get_clock ();
2907 /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
2908 /* interpolate in the meantime */
2909 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
2911 ev_rt_now = rtmn_diff + mn_now;
2916 ev_rt_now = ev_time ();
2918 /* loop a few times, before making important decisions.
2919 * on the choice of "4": one iteration isn't enough,
2920 * in case we get preempted during the calls to
2921 * ev_time and get_clock. a second call is almost guaranteed
2922 * to succeed in that case, though. and looping a few more times
2923 * doesn't hurt either as we only do this on time-jumps or
2924 * in the unlikely event of having been preempted here.
2929 rtmn_diff = ev_rt_now - mn_now;
2931 diff = odiff - rtmn_diff;
2933 if (expect_true ((diff < 0. ? -diff : diff) < MIN_TIMEJUMP))
2934 return; /* all is well */
2936 ev_rt_now = ev_time ();
2937 mn_now = get_clock ();
2941 /* no timer adjustment, as the monotonic clock doesn't jump */
2942 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
2943 # if EV_PERIODIC_ENABLE
2944 periodics_reschedule (EV_A);
2950 ev_rt_now = ev_time ();
2952 if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
2954 /* adjust timers. this is easy, as the offset is the same for all of them */
2955 timers_reschedule (EV_A_ ev_rt_now - mn_now);
2956 #if EV_PERIODIC_ENABLE
2957 periodics_reschedule (EV_A);
2966 ev_run (EV_P_ int flags)
2972 assert (("libev: ev_loop recursion during release detected", loop_done != EVBREAK_RECURSE));
2974 loop_done = EVBREAK_CANCEL;
2976 EV_INVOKE_PENDING; /* in case we recurse, ensure ordering stays nice and clean */
2985 if (expect_false (curpid)) /* penalise the forking check even more */
2986 if (expect_false (getpid () != curpid))
2994 /* we might have forked, so queue fork handlers */
2995 if (expect_false (postfork))
2998 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
3003 #if EV_PREPARE_ENABLE
3004 /* queue prepare watchers (and execute them) */
3005 if (expect_false (preparecnt))
3007 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
3012 if (expect_false (loop_done))
3015 /* we might have forked, so reify kernel state if necessary */
3016 if (expect_false (postfork))
3019 /* update fd-related kernel structures */
3022 /* calculate blocking time */
3024 ev_tstamp waittime = 0.;
3025 ev_tstamp sleeptime = 0.;
3027 /* remember old timestamp for io_blocktime calculation */
3028 ev_tstamp prev_mn_now = mn_now;
3030 /* update time to cancel out callback processing overhead */
3031 time_update (EV_A_ 1e100);
3033 /* from now on, we want a pipe-wake-up */
3034 pipe_write_wanted = 1;
3036 ECB_MEMORY_FENCE; /* make sure pipe_write_wanted is visible before we check for potential skips */
3038 if (expect_true (!(flags & EVRUN_NOWAIT || idleall || !activecnt || pipe_write_skipped)))
3040 waittime = MAX_BLOCKTIME;
3044 ev_tstamp to = ANHE_at (timers [HEAP0]) - mn_now;
3045 if (waittime > to) waittime = to;
3048 #if EV_PERIODIC_ENABLE
3051 ev_tstamp to = ANHE_at (periodics [HEAP0]) - ev_rt_now;
3052 if (waittime > to) waittime = to;
3056 /* don't let timeouts decrease the waittime below timeout_blocktime */
3057 if (expect_false (waittime < timeout_blocktime))
3058 waittime = timeout_blocktime;
3060 /* at this point, we NEED to wait, so we have to ensure */
3061 /* to pass a minimum nonzero value to the backend */
3062 if (expect_false (waittime < backend_mintime))
3063 waittime = backend_mintime;
3065 /* extra check because io_blocktime is commonly 0 */
3066 if (expect_false (io_blocktime))
3068 sleeptime = io_blocktime - (mn_now - prev_mn_now);
3070 if (sleeptime > waittime - backend_mintime)
3071 sleeptime = waittime - backend_mintime;
3073 if (expect_true (sleeptime > 0.))
3075 ev_sleep (sleeptime);
3076 waittime -= sleeptime;
3084 assert ((loop_done = EVBREAK_RECURSE, 1)); /* assert for side effect */
3085 backend_poll (EV_A_ waittime);
3086 assert ((loop_done = EVBREAK_CANCEL, 1)); /* assert for side effect */
3088 pipe_write_wanted = 0; /* just an optimisation, no fence needed */
3090 if (pipe_write_skipped)
3092 assert (("libev: pipe_w not active, but pipe not written", ev_is_active (&pipe_w)));
3093 ev_feed_event (EV_A_ &pipe_w, EV_CUSTOM);
3097 /* update ev_rt_now, do magic */
3098 time_update (EV_A_ waittime + sleeptime);
3101 /* queue pending timers and reschedule them */
3102 timers_reify (EV_A); /* relative timers called last */
3103 #if EV_PERIODIC_ENABLE
3104 periodics_reify (EV_A); /* absolute timers called first */
3108 /* queue idle watchers unless other events are pending */
3113 /* queue check watchers, to be executed first */
3114 if (expect_false (checkcnt))
3115 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
3120 while (expect_true (
3123 && !(flags & (EVRUN_ONCE | EVRUN_NOWAIT))
3126 if (loop_done == EVBREAK_ONE)
3127 loop_done = EVBREAK_CANCEL;
3137 ev_break (EV_P_ int how) EV_THROW
3143 ev_ref (EV_P) EV_THROW
3149 ev_unref (EV_P) EV_THROW
3155 ev_now_update (EV_P) EV_THROW
3157 time_update (EV_A_ 1e100);
3161 ev_suspend (EV_P) EV_THROW
3163 ev_now_update (EV_A);
3167 ev_resume (EV_P) EV_THROW
3169 ev_tstamp mn_prev = mn_now;
3171 ev_now_update (EV_A);
3172 timers_reschedule (EV_A_ mn_now - mn_prev);
3173 #if EV_PERIODIC_ENABLE
3174 /* TODO: really do this? */
3175 periodics_reschedule (EV_A);
3179 /*****************************************************************************/
3180 /* singly-linked list management, used when the expected list length is short */
3183 wlist_add (WL *head, WL elem)
3190 wlist_del (WL *head, WL elem)
3194 if (expect_true (*head == elem))
3200 head = &(*head)->next;
3204 /* internal, faster, version of ev_clear_pending */
3206 clear_pending (EV_P_ W w)
3210 pendings [ABSPRI (w)][w->pending - 1].w = (W)&pending_w;
3216 ev_clear_pending (EV_P_ void *w) EV_THROW
3219 int pending = w_->pending;
3221 if (expect_true (pending))
3223 ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
3224 p->w = (W)&pending_w;
3233 pri_adjust (EV_P_ W w)
3235 int pri = ev_priority (w);
3236 pri = pri < EV_MINPRI ? EV_MINPRI : pri;
3237 pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
3238 ev_set_priority (w, pri);
3242 ev_start (EV_P_ W w, int active)
3244 pri_adjust (EV_A_ w);
3256 /*****************************************************************************/
3259 ev_io_start (EV_P_ ev_io *w) EV_THROW
3263 if (expect_false (ev_is_active (w)))
3266 assert (("libev: ev_io_start called with negative fd", fd >= 0));
3267 assert (("libev: ev_io_start called with illegal event mask", !(w->events & ~(EV__IOFDSET | EV_READ | EV_WRITE))));
3271 ev_start (EV_A_ (W)w, 1);
3272 array_needsize (ANFD, anfds, anfdmax, fd + 1, array_init_zero);
3273 wlist_add (&anfds[fd].head, (WL)w);
3275 /* common bug, apparently */
3276 assert (("libev: ev_io_start called with corrupted watcher", ((WL)w)->next != (WL)w));
3278 fd_change (EV_A_ fd, w->events & EV__IOFDSET | EV_ANFD_REIFY);
3279 w->events &= ~EV__IOFDSET;
3285 ev_io_stop (EV_P_ ev_io *w) EV_THROW
3287 clear_pending (EV_A_ (W)w);
3288 if (expect_false (!ev_is_active (w)))
3291 assert (("libev: ev_io_stop called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
3295 wlist_del (&anfds[w->fd].head, (WL)w);
3296 ev_stop (EV_A_ (W)w);
3298 fd_change (EV_A_ w->fd, EV_ANFD_REIFY);
3304 ev_timer_start (EV_P_ ev_timer *w) EV_THROW
3306 if (expect_false (ev_is_active (w)))
3309 ev_at (w) += mn_now;
3311 assert (("libev: ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
3316 ev_start (EV_A_ (W)w, timercnt + HEAP0 - 1);
3317 array_needsize (ANHE, timers, timermax, ev_active (w) + 1, EMPTY2);
3318 ANHE_w (timers [ev_active (w)]) = (WT)w;
3319 ANHE_at_cache (timers [ev_active (w)]);
3320 upheap (timers, ev_active (w));
3324 /*assert (("libev: internal timer heap corruption", timers [ev_active (w)] == (WT)w));*/
3328 ev_timer_stop (EV_P_ ev_timer *w) EV_THROW
3330 clear_pending (EV_A_ (W)w);
3331 if (expect_false (!ev_is_active (w)))
3337 int active = ev_active (w);
3339 assert (("libev: internal timer heap corruption", ANHE_w (timers [active]) == (WT)w));
3343 if (expect_true (active < timercnt + HEAP0))
3345 timers [active] = timers [timercnt + HEAP0];
3346 adjustheap (timers, timercnt, active);
3350 ev_at (w) -= mn_now;
3352 ev_stop (EV_A_ (W)w);
3358 ev_timer_again (EV_P_ ev_timer *w) EV_THROW
3362 clear_pending (EV_A_ (W)w);
3364 if (ev_is_active (w))
3368 ev_at (w) = mn_now + w->repeat;
3369 ANHE_at_cache (timers [ev_active (w)]);
3370 adjustheap (timers, timercnt, ev_active (w));
3373 ev_timer_stop (EV_A_ w);
3377 ev_at (w) = w->repeat;
3378 ev_timer_start (EV_A_ w);
3385 ev_timer_remaining (EV_P_ ev_timer *w) EV_THROW
3387 return ev_at (w) - (ev_is_active (w) ? mn_now : 0.);
3390 #if EV_PERIODIC_ENABLE
3392 ev_periodic_start (EV_P_ ev_periodic *w) EV_THROW
3394 if (expect_false (ev_is_active (w)))
3397 if (w->reschedule_cb)
3398 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
3399 else if (w->interval)
3401 assert (("libev: ev_periodic_start called with negative interval value", w->interval >= 0.));
3402 periodic_recalc (EV_A_ w);
3405 ev_at (w) = w->offset;
3410 ev_start (EV_A_ (W)w, periodiccnt + HEAP0 - 1);
3411 array_needsize (ANHE, periodics, periodicmax, ev_active (w) + 1, EMPTY2);
3412 ANHE_w (periodics [ev_active (w)]) = (WT)w;
3413 ANHE_at_cache (periodics [ev_active (w)]);
3414 upheap (periodics, ev_active (w));
3418 /*assert (("libev: internal periodic heap corruption", ANHE_w (periodics [ev_active (w)]) == (WT)w));*/
3422 ev_periodic_stop (EV_P_ ev_periodic *w) EV_THROW
3424 clear_pending (EV_A_ (W)w);
3425 if (expect_false (!ev_is_active (w)))
3431 int active = ev_active (w);
3433 assert (("libev: internal periodic heap corruption", ANHE_w (periodics [active]) == (WT)w));
3437 if (expect_true (active < periodiccnt + HEAP0))
3439 periodics [active] = periodics [periodiccnt + HEAP0];
3440 adjustheap (periodics, periodiccnt, active);
3444 ev_stop (EV_A_ (W)w);
3450 ev_periodic_again (EV_P_ ev_periodic *w) EV_THROW
3452 /* TODO: use adjustheap and recalculation */
3453 ev_periodic_stop (EV_A_ w);
3454 ev_periodic_start (EV_A_ w);
3459 # define SA_RESTART 0
3462 #if EV_SIGNAL_ENABLE
3465 ev_signal_start (EV_P_ ev_signal *w) EV_THROW
3467 if (expect_false (ev_is_active (w)))
3470 assert (("libev: ev_signal_start called with illegal signal number", w->signum > 0 && w->signum < EV_NSIG));
3473 assert (("libev: a signal must not be attached to two different loops",
3474 !signals [w->signum - 1].loop || signals [w->signum - 1].loop == loop));
3476 signals [w->signum - 1].loop = EV_A;
3484 sigfd = signalfd (-1, &sigfd_set, SFD_NONBLOCK | SFD_CLOEXEC);
3485 if (sigfd < 0 && errno == EINVAL)
3486 sigfd = signalfd (-1, &sigfd_set, 0); /* retry without flags */
3490 fd_intern (sigfd); /* doing it twice will not hurt */
3492 sigemptyset (&sigfd_set);
3494 ev_io_init (&sigfd_w, sigfdcb, sigfd, EV_READ);
3495 ev_set_priority (&sigfd_w, EV_MAXPRI);
3496 ev_io_start (EV_A_ &sigfd_w);
3497 ev_unref (EV_A); /* signalfd watcher should not keep loop alive */
3503 /* TODO: check .head */
3504 sigaddset (&sigfd_set, w->signum);
3505 sigprocmask (SIG_BLOCK, &sigfd_set, 0);
3507 signalfd (sigfd, &sigfd_set, 0);
3511 ev_start (EV_A_ (W)w, 1);
3512 wlist_add (&signals [w->signum - 1].head, (WL)w);
3515 # if EV_USE_SIGNALFD
3516 if (sigfd < 0) /*TODO*/
3522 signal (w->signum, ev_sighandler);
3524 struct sigaction sa;
3528 sa.sa_handler = ev_sighandler;
3529 sigfillset (&sa.sa_mask);
3530 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
3531 sigaction (w->signum, &sa, 0);
3533 if (origflags & EVFLAG_NOSIGMASK)
3535 sigemptyset (&sa.sa_mask);
3536 sigaddset (&sa.sa_mask, w->signum);
3537 sigprocmask (SIG_UNBLOCK, &sa.sa_mask, 0);
3546 ev_signal_stop (EV_P_ ev_signal *w) EV_THROW
3548 clear_pending (EV_A_ (W)w);
3549 if (expect_false (!ev_is_active (w)))
3554 wlist_del (&signals [w->signum - 1].head, (WL)w);
3555 ev_stop (EV_A_ (W)w);
3557 if (!signals [w->signum - 1].head)
3560 signals [w->signum - 1].loop = 0; /* unattach from signal */
3568 sigaddset (&ss, w->signum);
3569 sigdelset (&sigfd_set, w->signum);
3571 signalfd (sigfd, &sigfd_set, 0);
3572 sigprocmask (SIG_UNBLOCK, &ss, 0);
3576 signal (w->signum, SIG_DFL);
3587 ev_child_start (EV_P_ ev_child *w) EV_THROW
3590 assert (("libev: child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
3592 if (expect_false (ev_is_active (w)))
3597 ev_start (EV_A_ (W)w, 1);
3598 wlist_add (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);
3604 ev_child_stop (EV_P_ ev_child *w) EV_THROW
3606 clear_pending (EV_A_ (W)w);
3607 if (expect_false (!ev_is_active (w)))
3612 wlist_del (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);
3613 ev_stop (EV_A_ (W)w);
3624 # define lstat(a,b) _stati64 (a,b)
3627 #define DEF_STAT_INTERVAL 5.0074891
3628 #define NFS_STAT_INTERVAL 30.1074891 /* for filesystems potentially failing inotify */
3629 #define MIN_STAT_INTERVAL 0.1074891
3631 static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
3635 /* the * 2 is to allow for alignment padding, which for some reason is >> 8 */
3636 # define EV_INOTIFY_BUFSIZE (sizeof (struct inotify_event) * 2 + NAME_MAX)
3638 static void noinline
3639 infy_add (EV_P_ ev_stat *w)
3641 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);
3647 /* now local changes will be tracked by inotify, but remote changes won't */
3648 /* unless the filesystem is known to be local, we therefore still poll */
3649 /* also do poll on <2.6.25, but with normal frequency */
3652 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3653 else if (!statfs (w->path, &sfs)
3654 && (sfs.f_type == 0x1373 /* devfs */
3655 || sfs.f_type == 0xEF53 /* ext2/3 */
3656 || sfs.f_type == 0x3153464a /* jfs */
3657 || sfs.f_type == 0x52654973 /* reiser3 */
3658 || sfs.f_type == 0x01021994 /* tempfs */
3659 || sfs.f_type == 0x58465342 /* xfs */))
3660 w->timer.repeat = 0.; /* filesystem is local, kernel new enough */
3662 w->timer.repeat = w->interval ? w->interval : NFS_STAT_INTERVAL; /* remote, use reduced frequency */
3666 /* can't use inotify, continue to stat */
3667 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3669 /* if path is not there, monitor some parent directory for speedup hints */
3670 /* note that exceeding the hardcoded path limit is not a correctness issue, */
3671 /* but an efficiency issue only */
3672 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
3675 strcpy (path, w->path);
3679 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
3680 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
3682 char *pend = strrchr (path, '/');
3684 if (!pend || pend == path)
3688 w->wd = inotify_add_watch (fs_fd, path, mask);
3690 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
3695 wlist_add (&fs_hash [w->wd & ((EV_INOTIFY_HASHSIZE) - 1)].head, (WL)w);
3697 /* now re-arm timer, if required */
3698 if (ev_is_active (&w->timer)) ev_ref (EV_A);
3699 ev_timer_again (EV_A_ &w->timer);
3700 if (ev_is_active (&w->timer)) ev_unref (EV_A);
3703 static void noinline
3704 infy_del (EV_P_ ev_stat *w)
3713 slot = wd & ((EV_INOTIFY_HASHSIZE) - 1);
3714 wlist_del (&fs_hash [slot].head, (WL)w);
3716 /* remove this watcher, if others are watching it, they will rearm */
3717 inotify_rm_watch (fs_fd, wd);
3720 static void noinline
3721 infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
3724 /* overflow, need to check for all hash slots */
3725 for (slot = 0; slot < (EV_INOTIFY_HASHSIZE); ++slot)
3726 infy_wd (EV_A_ slot, wd, ev);
3731 for (w_ = fs_hash [slot & ((EV_INOTIFY_HASHSIZE) - 1)].head; w_; )
3733 ev_stat *w = (ev_stat *)w_;
3734 w_ = w_->next; /* lets us remove this watcher and all before it */
3736 if (w->wd == wd || wd == -1)
3738 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
3740 wlist_del (&fs_hash [slot & ((EV_INOTIFY_HASHSIZE) - 1)].head, (WL)w);
3742 infy_add (EV_A_ w); /* re-add, no matter what */
3745 stat_timer_cb (EV_A_ &w->timer, 0);
3752 infy_cb (EV_P_ ev_io *w, int revents)
3754 char buf [EV_INOTIFY_BUFSIZE];
3756 int len = read (fs_fd, buf, sizeof (buf));
3758 for (ofs = 0; ofs < len; )
3760 struct inotify_event *ev = (struct inotify_event *)(buf + ofs);
3761 infy_wd (EV_A_ ev->wd, ev->wd, ev);
3762 ofs += sizeof (struct inotify_event) + ev->len;
3766 inline_size void ecb_cold
3767 ev_check_2625 (EV_P)
3769 /* kernels < 2.6.25 are borked
3770 * http://www.ussg.indiana.edu/hypermail/linux/kernel/0711.3/1208.html
3772 if (ev_linux_version () < 0x020619)
3781 #if defined IN_CLOEXEC && defined IN_NONBLOCK
3782 int fd = inotify_init1 (IN_CLOEXEC | IN_NONBLOCK);
3786 return inotify_init ();
3797 ev_check_2625 (EV_A);
3799 fs_fd = infy_newfd ();
3804 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
3805 ev_set_priority (&fs_w, EV_MAXPRI);
3806 ev_io_start (EV_A_ &fs_w);
3820 ev_io_stop (EV_A_ &fs_w);
3822 fs_fd = infy_newfd ();
3827 ev_io_set (&fs_w, fs_fd, EV_READ);
3828 ev_io_start (EV_A_ &fs_w);
3832 for (slot = 0; slot < (EV_INOTIFY_HASHSIZE); ++slot)
3834 WL w_ = fs_hash [slot].head;
3835 fs_hash [slot].head = 0;
3839 ev_stat *w = (ev_stat *)w_;
3840 w_ = w_->next; /* lets us add this watcher */
3845 infy_add (EV_A_ w); /* re-add, no matter what */
3848 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3849 if (ev_is_active (&w->timer)) ev_ref (EV_A);
3850 ev_timer_again (EV_A_ &w->timer);
3851 if (ev_is_active (&w->timer)) ev_unref (EV_A);
3860 # define EV_LSTAT(p,b) _stati64 (p, b)
3862 # define EV_LSTAT(p,b) lstat (p, b)
3866 ev_stat_stat (EV_P_ ev_stat *w) EV_THROW
3868 if (lstat (w->path, &w->attr) < 0)
3869 w->attr.st_nlink = 0;
3870 else if (!w->attr.st_nlink)
3871 w->attr.st_nlink = 1;
3874 static void noinline
3875 stat_timer_cb (EV_P_ ev_timer *w_, int revents)
3877 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
3879 ev_statdata prev = w->attr;
3880 ev_stat_stat (EV_A_ w);
3882 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
3884 prev.st_dev != w->attr.st_dev
3885 || prev.st_ino != w->attr.st_ino
3886 || prev.st_mode != w->attr.st_mode
3887 || prev.st_nlink != w->attr.st_nlink
3888 || prev.st_uid != w->attr.st_uid
3889 || prev.st_gid != w->attr.st_gid
3890 || prev.st_rdev != w->attr.st_rdev
3891 || prev.st_size != w->attr.st_size
3892 || prev.st_atime != w->attr.st_atime
3893 || prev.st_mtime != w->attr.st_mtime
3894 || prev.st_ctime != w->attr.st_ctime
3896 /* we only update w->prev on actual differences */
3897 /* in case we test more often than invoke the callback, */
3898 /* to ensure that prev is always different to attr */
3906 ev_stat_stat (EV_A_ w); /* avoid race... */
3910 ev_feed_event (EV_A_ w, EV_STAT);
3915 ev_stat_start (EV_P_ ev_stat *w) EV_THROW
3917 if (expect_false (ev_is_active (w)))
3920 ev_stat_stat (EV_A_ w);
3922 if (w->interval < MIN_STAT_INTERVAL && w->interval)
3923 w->interval = MIN_STAT_INTERVAL;
3925 ev_timer_init (&w->timer, stat_timer_cb, 0., w->interval ? w->interval : DEF_STAT_INTERVAL);
3926 ev_set_priority (&w->timer, ev_priority (w));
3936 ev_timer_again (EV_A_ &w->timer);
3940 ev_start (EV_A_ (W)w, 1);
3946 ev_stat_stop (EV_P_ ev_stat *w) EV_THROW
3948 clear_pending (EV_A_ (W)w);
3949 if (expect_false (!ev_is_active (w)))
3958 if (ev_is_active (&w->timer))
3961 ev_timer_stop (EV_A_ &w->timer);
3964 ev_stop (EV_A_ (W)w);
3972 ev_idle_start (EV_P_ ev_idle *w) EV_THROW
3974 if (expect_false (ev_is_active (w)))
3977 pri_adjust (EV_A_ (W)w);
3982 int active = ++idlecnt [ABSPRI (w)];
3985 ev_start (EV_A_ (W)w, active);
3987 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
3988 idles [ABSPRI (w)][active - 1] = w;
3995 ev_idle_stop (EV_P_ ev_idle *w) EV_THROW
3997 clear_pending (EV_A_ (W)w);
3998 if (expect_false (!ev_is_active (w)))
4004 int active = ev_active (w);
4006 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
4007 ev_active (idles [ABSPRI (w)][active - 1]) = active;
4009 ev_stop (EV_A_ (W)w);
4017 #if EV_PREPARE_ENABLE
4019 ev_prepare_start (EV_P_ ev_prepare *w) EV_THROW
4021 if (expect_false (ev_is_active (w)))
4026 ev_start (EV_A_ (W)w, ++preparecnt);
4027 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
4028 prepares [preparecnt - 1] = w;
4034 ev_prepare_stop (EV_P_ ev_prepare *w) EV_THROW
4036 clear_pending (EV_A_ (W)w);
4037 if (expect_false (!ev_is_active (w)))
4043 int active = ev_active (w);
4045 prepares [active - 1] = prepares [--preparecnt];
4046 ev_active (prepares [active - 1]) = active;
4049 ev_stop (EV_A_ (W)w);
4057 ev_check_start (EV_P_ ev_check *w) EV_THROW
4059 if (expect_false (ev_is_active (w)))
4064 ev_start (EV_A_ (W)w, ++checkcnt);
4065 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
4066 checks [checkcnt - 1] = w;
4072 ev_check_stop (EV_P_ ev_check *w) EV_THROW
4074 clear_pending (EV_A_ (W)w);
4075 if (expect_false (!ev_is_active (w)))
4081 int active = ev_active (w);
4083 checks [active - 1] = checks [--checkcnt];
4084 ev_active (checks [active - 1]) = active;
4087 ev_stop (EV_A_ (W)w);
4095 ev_embed_sweep (EV_P_ ev_embed *w) EV_THROW
4097 ev_run (w->other, EVRUN_NOWAIT);
4101 embed_io_cb (EV_P_ ev_io *io, int revents)
4103 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
4106 ev_feed_event (EV_A_ (W)w, EV_EMBED);
4108 ev_run (w->other, EVRUN_NOWAIT);
4112 embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
4114 ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
4122 ev_run (EV_A_ EVRUN_NOWAIT);
4128 embed_fork_cb (EV_P_ ev_fork *fork_w, int revents)
4130 ev_embed *w = (ev_embed *)(((char *)fork_w) - offsetof (ev_embed, fork));
4132 ev_embed_stop (EV_A_ w);
4137 ev_loop_fork (EV_A);
4138 ev_run (EV_A_ EVRUN_NOWAIT);
4141 ev_embed_start (EV_A_ w);
4146 embed_idle_cb (EV_P_ ev_idle *idle, int revents)
4148 ev_idle_stop (EV_A_ idle);
4153 ev_embed_start (EV_P_ ev_embed *w) EV_THROW
4155 if (expect_false (ev_is_active (w)))
4160 assert (("libev: loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
4161 ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
4166 ev_set_priority (&w->io, ev_priority (w));
4167 ev_io_start (EV_A_ &w->io);
4169 ev_prepare_init (&w->prepare, embed_prepare_cb);
4170 ev_set_priority (&w->prepare, EV_MINPRI);
4171 ev_prepare_start (EV_A_ &w->prepare);
4173 ev_fork_init (&w->fork, embed_fork_cb);
4174 ev_fork_start (EV_A_ &w->fork);
4176 /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
4178 ev_start (EV_A_ (W)w, 1);
4184 ev_embed_stop (EV_P_ ev_embed *w) EV_THROW
4186 clear_pending (EV_A_ (W)w);
4187 if (expect_false (!ev_is_active (w)))
4192 ev_io_stop (EV_A_ &w->io);
4193 ev_prepare_stop (EV_A_ &w->prepare);
4194 ev_fork_stop (EV_A_ &w->fork);
4196 ev_stop (EV_A_ (W)w);
4204 ev_fork_start (EV_P_ ev_fork *w) EV_THROW
4206 if (expect_false (ev_is_active (w)))
4211 ev_start (EV_A_ (W)w, ++forkcnt);
4212 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
4213 forks [forkcnt - 1] = w;
4219 ev_fork_stop (EV_P_ ev_fork *w) EV_THROW
4221 clear_pending (EV_A_ (W)w);
4222 if (expect_false (!ev_is_active (w)))
4228 int active = ev_active (w);
4230 forks [active - 1] = forks [--forkcnt];
4231 ev_active (forks [active - 1]) = active;
4234 ev_stop (EV_A_ (W)w);
4240 #if EV_CLEANUP_ENABLE
4242 ev_cleanup_start (EV_P_ ev_cleanup *w) EV_THROW
4244 if (expect_false (ev_is_active (w)))
4249 ev_start (EV_A_ (W)w, ++cleanupcnt);
4250 array_needsize (ev_cleanup *, cleanups, cleanupmax, cleanupcnt, EMPTY2);
4251 cleanups [cleanupcnt - 1] = w;
4253 /* cleanup watchers should never keep a refcount on the loop */
4259 ev_cleanup_stop (EV_P_ ev_cleanup *w) EV_THROW
4261 clear_pending (EV_A_ (W)w);
4262 if (expect_false (!ev_is_active (w)))
4269 int active = ev_active (w);
4271 cleanups [active - 1] = cleanups [--cleanupcnt];
4272 ev_active (cleanups [active - 1]) = active;
4275 ev_stop (EV_A_ (W)w);
4283 ev_async_start (EV_P_ ev_async *w) EV_THROW
4285 if (expect_false (ev_is_active (w)))
4294 ev_start (EV_A_ (W)w, ++asynccnt);
4295 array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
4296 asyncs [asynccnt - 1] = w;
4302 ev_async_stop (EV_P_ ev_async *w) EV_THROW
4304 clear_pending (EV_A_ (W)w);
4305 if (expect_false (!ev_is_active (w)))
4311 int active = ev_active (w);
4313 asyncs [active - 1] = asyncs [--asynccnt];
4314 ev_active (asyncs [active - 1]) = active;
4317 ev_stop (EV_A_ (W)w);
4323 ev_async_send (EV_P_ ev_async *w) EV_THROW
4326 evpipe_write (EV_A_ &async_pending);
4330 /*****************************************************************************/
4336 void (*cb)(int revents, void *arg);
4341 once_cb (EV_P_ struct ev_once *once, int revents)
4343 void (*cb)(int revents, void *arg) = once->cb;
4344 void *arg = once->arg;
4346 ev_io_stop (EV_A_ &once->io);
4347 ev_timer_stop (EV_A_ &once->to);
4354 once_cb_io (EV_P_ ev_io *w, int revents)
4356 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io));
4358 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->to));
4362 once_cb_to (EV_P_ ev_timer *w, int revents)
4364 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to));
4366 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->io));
4370 ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg) EV_THROW
4372 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
4374 if (expect_false (!once))
4376 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMER, arg);
4383 ev_init (&once->io, once_cb_io);
4386 ev_io_set (&once->io, fd, events);
4387 ev_io_start (EV_A_ &once->io);
4390 ev_init (&once->to, once_cb_to);
4393 ev_timer_set (&once->to, timeout, 0.);
4394 ev_timer_start (EV_A_ &once->to);
4398 /*****************************************************************************/
4402 ev_walk (EV_P_ int types, void (*cb)(EV_P_ int type, void *w)) EV_THROW
4405 ev_watcher_list *wl, *wn;
4407 if (types & (EV_IO | EV_EMBED))
4408 for (i = 0; i < anfdmax; ++i)
4409 for (wl = anfds [i].head; wl; )
4414 if (ev_cb ((ev_io *)wl) == embed_io_cb)
4416 if (types & EV_EMBED)
4417 cb (EV_A_ EV_EMBED, ((char *)wl) - offsetof (struct ev_embed, io));
4422 if (ev_cb ((ev_io *)wl) == infy_cb)
4426 if ((ev_io *)wl != &pipe_w)
4428 cb (EV_A_ EV_IO, wl);
4433 if (types & (EV_TIMER | EV_STAT))
4434 for (i = timercnt + HEAP0; i-- > HEAP0; )
4436 /*TODO: timer is not always active*/
4437 if (ev_cb ((ev_timer *)ANHE_w (timers [i])) == stat_timer_cb)
4439 if (types & EV_STAT)
4440 cb (EV_A_ EV_STAT, ((char *)ANHE_w (timers [i])) - offsetof (struct ev_stat, timer));
4444 if (types & EV_TIMER)
4445 cb (EV_A_ EV_TIMER, ANHE_w (timers [i]));
4447 #if EV_PERIODIC_ENABLE
4448 if (types & EV_PERIODIC)
4449 for (i = periodiccnt + HEAP0; i-- > HEAP0; )
4450 cb (EV_A_ EV_PERIODIC, ANHE_w (periodics [i]));
4454 if (types & EV_IDLE)
4455 for (j = NUMPRI; j--; )
4456 for (i = idlecnt [j]; i--; )
4457 cb (EV_A_ EV_IDLE, idles [j][i]);
4461 if (types & EV_FORK)
4462 for (i = forkcnt; i--; )
4463 if (ev_cb (forks [i]) != embed_fork_cb)
4464 cb (EV_A_ EV_FORK, forks [i]);
4468 if (types & EV_ASYNC)
4469 for (i = asynccnt; i--; )
4470 cb (EV_A_ EV_ASYNC, asyncs [i]);
4473 #if EV_PREPARE_ENABLE
4474 if (types & EV_PREPARE)
4475 for (i = preparecnt; i--; )
4476 # if EV_EMBED_ENABLE
4477 if (ev_cb (prepares [i]) != embed_prepare_cb)
4479 cb (EV_A_ EV_PREPARE, prepares [i]);
4483 if (types & EV_CHECK)
4484 for (i = checkcnt; i--; )
4485 cb (EV_A_ EV_CHECK, checks [i]);
4488 #if EV_SIGNAL_ENABLE
4489 if (types & EV_SIGNAL)
4490 for (i = 0; i < EV_NSIG - 1; ++i)
4491 for (wl = signals [i].head; wl; )
4494 cb (EV_A_ EV_SIGNAL, wl);
4500 if (types & EV_CHILD)
4501 for (i = (EV_PID_HASHSIZE); i--; )
4502 for (wl = childs [i]; wl; )
4505 cb (EV_A_ EV_CHILD, wl);
4509 /* EV_STAT 0x00001000 /* stat data changed */
4510 /* EV_EMBED 0x00010000 /* embedded event loop needs sweep */
4515 #include "ev_wrap.h"