2 * libev event processing core, watcher management
4 * Copyright (c) 2007,2008,2009,2010,2011 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>
189 # include <sys/time.h>
190 # include <sys/wait.h>
194 # define WIN32_LEAN_AND_MEAN
195 # include <windows.h>
196 # ifndef EV_SELECT_IS_WINSOCKET
197 # define EV_SELECT_IS_WINSOCKET 1
199 # undef EV_AVOID_STDIO
202 /* OS X, in its infinite idiocy, actually HARDCODES
203 * a limit of 1024 into their select. Where people have brains,
204 * OS X engineers apparently have a vacuum. Or maybe they were
205 * ordered to have a vacuum, or they do anything for money.
206 * This might help. Or not.
208 #define _DARWIN_UNLIMITED_SELECT 1
210 /* this block tries to deduce configuration from header-defined symbols and defaults */
212 /* try to deduce the maximum number of signals on this platform */
213 #if defined (EV_NSIG)
214 /* use what's provided */
216 # define EV_NSIG (NSIG)
218 # define EV_NSIG (_NSIG)
219 #elif defined (SIGMAX)
220 # define EV_NSIG (SIGMAX+1)
221 #elif defined (SIG_MAX)
222 # define EV_NSIG (SIG_MAX+1)
223 #elif defined (_SIG_MAX)
224 # define EV_NSIG (_SIG_MAX+1)
225 #elif defined (MAXSIG)
226 # define EV_NSIG (MAXSIG+1)
227 #elif defined (MAX_SIG)
228 # define EV_NSIG (MAX_SIG+1)
229 #elif defined (SIGARRAYSIZE)
230 # define EV_NSIG (SIGARRAYSIZE) /* Assume ary[SIGARRAYSIZE] */
231 #elif defined (_sys_nsig)
232 # define EV_NSIG (_sys_nsig) /* Solaris 2.5 */
234 # error "unable to find value for NSIG, please report"
235 /* to make it compile regardless, just remove the above line, */
236 /* but consider reporting it, too! :) */
241 # define EV_USE_FLOOR 0
244 #ifndef EV_USE_CLOCK_SYSCALL
245 # if __linux && __GLIBC__ >= 2
246 # define EV_USE_CLOCK_SYSCALL EV_FEATURE_OS
248 # define EV_USE_CLOCK_SYSCALL 0
252 #ifndef EV_USE_MONOTONIC
253 # if defined (_POSIX_MONOTONIC_CLOCK) && _POSIX_MONOTONIC_CLOCK >= 0
254 # define EV_USE_MONOTONIC EV_FEATURE_OS
256 # define EV_USE_MONOTONIC 0
260 #ifndef EV_USE_REALTIME
261 # define EV_USE_REALTIME !EV_USE_CLOCK_SYSCALL
264 #ifndef EV_USE_NANOSLEEP
265 # if _POSIX_C_SOURCE >= 199309L
266 # define EV_USE_NANOSLEEP EV_FEATURE_OS
268 # define EV_USE_NANOSLEEP 0
272 #ifndef EV_USE_SELECT
273 # define EV_USE_SELECT EV_FEATURE_BACKENDS
278 # define EV_USE_POLL 0
280 # define EV_USE_POLL EV_FEATURE_BACKENDS
285 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
286 # define EV_USE_EPOLL EV_FEATURE_BACKENDS
288 # define EV_USE_EPOLL 0
292 #ifndef EV_USE_KQUEUE
293 # define EV_USE_KQUEUE 0
297 # define EV_USE_PORT 0
300 #ifndef EV_USE_INOTIFY
301 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
302 # define EV_USE_INOTIFY EV_FEATURE_OS
304 # define EV_USE_INOTIFY 0
308 #ifndef EV_PID_HASHSIZE
309 # define EV_PID_HASHSIZE EV_FEATURE_DATA ? 16 : 1
312 #ifndef EV_INOTIFY_HASHSIZE
313 # define EV_INOTIFY_HASHSIZE EV_FEATURE_DATA ? 16 : 1
316 #ifndef EV_USE_EVENTFD
317 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
318 # define EV_USE_EVENTFD EV_FEATURE_OS
320 # define EV_USE_EVENTFD 0
324 #ifndef EV_USE_SIGNALFD
325 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
326 # define EV_USE_SIGNALFD EV_FEATURE_OS
328 # define EV_USE_SIGNALFD 0
332 #if 0 /* debugging */
334 # define EV_USE_4HEAP 1
335 # define EV_HEAP_CACHE_AT 1
339 # define EV_VERIFY (EV_FEATURE_API ? 1 : 0)
343 # define EV_USE_4HEAP EV_FEATURE_DATA
346 #ifndef EV_HEAP_CACHE_AT
347 # define EV_HEAP_CACHE_AT EV_FEATURE_DATA
350 /* on linux, we can use a (slow) syscall to avoid a dependency on pthread, */
351 /* which makes programs even slower. might work on other unices, too. */
352 #if EV_USE_CLOCK_SYSCALL
353 # include <syscall.h>
354 # ifdef SYS_clock_gettime
355 # define clock_gettime(id, ts) syscall (SYS_clock_gettime, (id), (ts))
356 # undef EV_USE_MONOTONIC
357 # define EV_USE_MONOTONIC 1
359 # undef EV_USE_CLOCK_SYSCALL
360 # define EV_USE_CLOCK_SYSCALL 0
364 /* this block fixes any misconfiguration where we know we run into trouble otherwise */
367 /* AIX has a completely broken poll.h header */
369 # define EV_USE_POLL 0
372 #ifndef CLOCK_MONOTONIC
373 # undef EV_USE_MONOTONIC
374 # define EV_USE_MONOTONIC 0
377 #ifndef CLOCK_REALTIME
378 # undef EV_USE_REALTIME
379 # define EV_USE_REALTIME 0
383 # undef EV_USE_INOTIFY
384 # define EV_USE_INOTIFY 0
387 #if !EV_USE_NANOSLEEP
388 /* hp-ux has it in sys/time.h, which we unconditionally include above */
389 # if !defined(_WIN32) && !defined(__hpux)
390 # include <sys/select.h>
395 # include <sys/statfs.h>
396 # include <sys/inotify.h>
397 /* some very old inotify.h headers don't have IN_DONT_FOLLOW */
398 # ifndef IN_DONT_FOLLOW
399 # undef EV_USE_INOTIFY
400 # define EV_USE_INOTIFY 0
404 #if EV_SELECT_IS_WINSOCKET
405 # include <winsock.h>
409 /* our minimum requirement is glibc 2.7 which has the stub, but not the header */
411 # ifndef EFD_NONBLOCK
412 # define EFD_NONBLOCK O_NONBLOCK
416 # define EFD_CLOEXEC O_CLOEXEC
418 # define EFD_CLOEXEC 02000000
421 EV_CPP(extern "C") int (eventfd) (unsigned int initval, int flags);
425 /* our minimum requirement is glibc 2.7 which has the stub, but not the header */
427 # ifndef SFD_NONBLOCK
428 # define SFD_NONBLOCK O_NONBLOCK
432 # define SFD_CLOEXEC O_CLOEXEC
434 # define SFD_CLOEXEC 02000000
437 EV_CPP (extern "C") int signalfd (int fd, const sigset_t *mask, int flags);
439 struct signalfd_siginfo
442 char pad[128 - sizeof (uint32_t)];
449 # define EV_FREQUENT_CHECK ev_verify (EV_A)
451 # define EV_FREQUENT_CHECK do { } while (0)
455 * This is used to work around floating point rounding problems.
456 * This value is good at least till the year 4000.
458 #define MIN_INTERVAL 0.0001220703125 /* 1/2**13, good till 4000 */
459 /*#define MIN_INTERVAL 0.00000095367431640625 /* 1/2**20, good till 2200 */
461 #define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
462 #define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
464 #define EV_TV_SET(tv,t) do { tv.tv_sec = (long)t; tv.tv_usec = (long)((t - tv.tv_sec) * 1e6); } while (0)
465 #define EV_TS_SET(ts,t) do { ts.tv_sec = (long)t; ts.tv_nsec = (long)((t - ts.tv_sec) * 1e9); } while (0)
467 /* the following is ecb.h embedded into libev - use update_ev_c to update from an external copy */
470 * libecb - http://software.schmorp.de/pkg/libecb
472 * Copyright (©) 2009-2012 Marc Alexander Lehmann <libecb@schmorp.de>
473 * Copyright (©) 2011 Emanuele Giaquinta
474 * All rights reserved.
476 * Redistribution and use in source and binary forms, with or without modifica-
477 * tion, are permitted provided that the following conditions are met:
479 * 1. Redistributions of source code must retain the above copyright notice,
480 * this list of conditions and the following disclaimer.
482 * 2. Redistributions in binary form must reproduce the above copyright
483 * notice, this list of conditions and the following disclaimer in the
484 * documentation and/or other materials provided with the distribution.
486 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
487 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
488 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
489 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
490 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
491 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
492 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
493 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
494 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
495 * OF THE POSSIBILITY OF SUCH DAMAGE.
502 typedef signed char int8_t;
503 typedef unsigned char uint8_t;
504 typedef signed short int16_t;
505 typedef unsigned short uint16_t;
506 typedef signed int int32_t;
507 typedef unsigned int uint32_t;
509 typedef signed long long int64_t;
510 typedef unsigned long long uint64_t;
511 #else /* _MSC_VER || __BORLANDC__ */
512 typedef signed __int64 int64_t;
513 typedef unsigned __int64 uint64_t;
516 #include <inttypes.h>
519 /* many compilers define _GNUC_ to some versions but then only implement
520 * what their idiot authors think are the "more important" extensions,
521 * causing enormous grief in return for some better fake benchmark numbers.
523 * we try to detect these and simply assume they are not gcc - if they have
524 * an issue with that they should have done it right in the first place.
526 #ifndef ECB_GCC_VERSION
527 #if !defined(__GNUC_MINOR__) || defined(__INTEL_COMPILER) || defined(__SUNPRO_C) || defined(__SUNPRO_CC) || defined(__llvm__) || defined(__clang__)
528 #define ECB_GCC_VERSION(major,minor) 0
530 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
534 /*****************************************************************************/
536 /* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
537 /* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
539 #if ECB_NO_THREADS || ECB_NO_SMP
540 #define ECB_MEMORY_FENCE do { } while (0)
543 #ifndef ECB_MEMORY_FENCE
544 #if ECB_GCC_VERSION(2,5) || defined(__INTEL_COMPILER) || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
545 #if __i386 || __i386__
546 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
547 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE /* non-lock xchg might be enough */
548 #define ECB_MEMORY_FENCE_RELEASE do { } while (0) /* unlikely to change in future cpus */
549 #elif __amd64 || __amd64__ || __x86_64 || __x86_64__
550 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
551 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("lfence" : : : "memory")
552 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("sfence") /* play safe - not needed in any current cpu */
553 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
554 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
555 #elif defined(__ARM_ARCH_6__ ) || defined(__ARM_ARCH_6J__ ) \
556 || defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6ZK__)
557 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
558 #elif defined(__ARM_ARCH_7__ ) || defined(__ARM_ARCH_7A__ ) \
559 || defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7R__ )
560 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
561 #elif __sparc || __sparc__
562 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad | " : : : "memory")
563 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
564 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
565 #elif defined(__s390__) || defined(__s390x__)
566 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
571 #ifndef ECB_MEMORY_FENCE
572 #if ECB_GCC_VERSION(4,4) || defined(__INTEL_COMPILER) || defined(__clang__)
573 #define ECB_MEMORY_FENCE __sync_synchronize ()
574 /*#define ECB_MEMORY_FENCE_ACQUIRE ({ char dummy = 0; __sync_lock_test_and_set (&dummy, 1); }) */
575 /*#define ECB_MEMORY_FENCE_RELEASE ({ char dummy = 1; __sync_lock_release (&dummy ); }) */
576 #elif _MSC_VER >= 1400 /* VC++ 2005 */
577 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
578 #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
579 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
580 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
581 #elif defined(_WIN32)
583 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
584 #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
585 #include <mbarrier.h>
586 #define ECB_MEMORY_FENCE __machine_rw_barrier ()
587 #define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier ()
588 #define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier ()
592 #ifndef ECB_MEMORY_FENCE
593 #if !ECB_AVOID_PTHREADS
595 * if you get undefined symbol references to pthread_mutex_lock,
596 * or failure to find pthread.h, then you should implement
597 * the ECB_MEMORY_FENCE operations for your cpu/compiler
598 * OR provide pthread.h and link against the posix thread library
602 #define ECB_NEEDS_PTHREADS 1
603 #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
605 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
606 #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
610 #if !defined(ECB_MEMORY_FENCE_ACQUIRE) && defined(ECB_MEMORY_FENCE)
611 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
614 #if !defined(ECB_MEMORY_FENCE_RELEASE) && defined(ECB_MEMORY_FENCE)
615 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
618 /*****************************************************************************/
620 #define ECB_C99 (__STDC_VERSION__ >= 199901L)
623 #define ecb_inline static inline
624 #elif ECB_GCC_VERSION(2,5)
625 #define ecb_inline static __inline__
627 #define ecb_inline static inline
629 #define ecb_inline static
632 #if ECB_GCC_VERSION(3,3)
633 #define ecb_restrict __restrict__
635 #define ecb_restrict restrict
640 typedef int ecb_bool;
642 #define ECB_CONCAT_(a, b) a ## b
643 #define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
644 #define ECB_STRINGIFY_(a) # a
645 #define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
647 #define ecb_function_ ecb_inline
649 #if ECB_GCC_VERSION(3,1)
650 #define ecb_attribute(attrlist) __attribute__(attrlist)
651 #define ecb_is_constant(expr) __builtin_constant_p (expr)
652 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
653 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
655 #define ecb_attribute(attrlist)
656 #define ecb_is_constant(expr) 0
657 #define ecb_expect(expr,value) (expr)
658 #define ecb_prefetch(addr,rw,locality)
661 /* no emulation for ecb_decltype */
662 #if ECB_GCC_VERSION(4,5)
663 #define ecb_decltype(x) __decltype(x)
664 #elif ECB_GCC_VERSION(3,0)
665 #define ecb_decltype(x) __typeof(x)
668 #define ecb_noinline ecb_attribute ((__noinline__))
669 #define ecb_noreturn ecb_attribute ((__noreturn__))
670 #define ecb_unused ecb_attribute ((__unused__))
671 #define ecb_const ecb_attribute ((__const__))
672 #define ecb_pure ecb_attribute ((__pure__))
674 #if ECB_GCC_VERSION(4,3)
675 #define ecb_artificial ecb_attribute ((__artificial__))
676 #define ecb_hot ecb_attribute ((__hot__))
677 #define ecb_cold ecb_attribute ((__cold__))
679 #define ecb_artificial
684 /* put around conditional expressions if you are very sure that the */
685 /* expression is mostly true or mostly false. note that these return */
686 /* booleans, not the expression. */
687 #define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
688 #define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
689 /* for compatibility to the rest of the world */
690 #define ecb_likely(expr) ecb_expect_true (expr)
691 #define ecb_unlikely(expr) ecb_expect_false (expr)
693 /* count trailing zero bits and count # of one bits */
694 #if ECB_GCC_VERSION(3,4)
695 /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
696 #define ecb_ld32(x) (__builtin_clz (x) ^ 31)
697 #define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
698 #define ecb_ctz32(x) __builtin_ctz (x)
699 #define ecb_ctz64(x) __builtin_ctzll (x)
700 #define ecb_popcount32(x) __builtin_popcount (x)
703 ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const;
705 ecb_ctz32 (uint32_t x)
709 x &= ~x + 1; /* this isolates the lowest bit */
711 #if ECB_branchless_on_i386
712 r += !!(x & 0xaaaaaaaa) << 0;
713 r += !!(x & 0xcccccccc) << 1;
714 r += !!(x & 0xf0f0f0f0) << 2;
715 r += !!(x & 0xff00ff00) << 3;
716 r += !!(x & 0xffff0000) << 4;
718 if (x & 0xaaaaaaaa) r += 1;
719 if (x & 0xcccccccc) r += 2;
720 if (x & 0xf0f0f0f0) r += 4;
721 if (x & 0xff00ff00) r += 8;
722 if (x & 0xffff0000) r += 16;
728 ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const;
730 ecb_ctz64 (uint64_t x)
732 int shift = x & 0xffffffffU ? 0 : 32;
733 return ecb_ctz32 (x >> shift) + shift;
736 ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const;
738 ecb_popcount32 (uint32_t x)
740 x -= (x >> 1) & 0x55555555;
741 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
742 x = ((x >> 4) + x) & 0x0f0f0f0f;
748 ecb_function_ int ecb_ld32 (uint32_t x) ecb_const;
749 ecb_function_ int ecb_ld32 (uint32_t x)
753 if (x >> 16) { x >>= 16; r += 16; }
754 if (x >> 8) { x >>= 8; r += 8; }
755 if (x >> 4) { x >>= 4; r += 4; }
756 if (x >> 2) { x >>= 2; r += 2; }
757 if (x >> 1) { r += 1; }
762 ecb_function_ int ecb_ld64 (uint64_t x) ecb_const;
763 ecb_function_ int ecb_ld64 (uint64_t x)
767 if (x >> 32) { x >>= 32; r += 32; }
769 return r + ecb_ld32 (x);
773 ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const;
774 ecb_function_ uint8_t ecb_bitrev8 (uint8_t x)
776 return ( (x * 0x0802U & 0x22110U)
777 | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
780 ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) ecb_const;
781 ecb_function_ uint16_t ecb_bitrev16 (uint16_t x)
783 x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1);
784 x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2);
785 x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4);
786 x = ( x >> 8 ) | ( x << 8);
791 ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) ecb_const;
792 ecb_function_ uint32_t ecb_bitrev32 (uint32_t x)
794 x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1);
795 x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2);
796 x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4);
797 x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8);
798 x = ( x >> 16 ) | ( x << 16);
803 /* popcount64 is only available on 64 bit cpus as gcc builtin */
804 /* so for this version we are lazy */
805 ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;
807 ecb_popcount64 (uint64_t x)
809 return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
812 ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const;
813 ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const;
814 ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const;
815 ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const;
816 ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
817 ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
818 ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const;
819 ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const;
821 ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }
822 ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }
823 ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }
824 ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }
825 ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
826 ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
827 ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
828 ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }
830 #if ECB_GCC_VERSION(4,3)
831 #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
832 #define ecb_bswap32(x) __builtin_bswap32 (x)
833 #define ecb_bswap64(x) __builtin_bswap64 (x)
835 ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const;
836 ecb_function_ uint16_t
837 ecb_bswap16 (uint16_t x)
839 return ecb_rotl16 (x, 8);
842 ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const;
843 ecb_function_ uint32_t
844 ecb_bswap32 (uint32_t x)
846 return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
849 ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const;
850 ecb_function_ uint64_t
851 ecb_bswap64 (uint64_t x)
853 return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
857 #if ECB_GCC_VERSION(4,5)
858 #define ecb_unreachable() __builtin_unreachable ()
860 /* this seems to work fine, but gcc always emits a warning for it :/ */
861 ecb_inline void ecb_unreachable (void) ecb_noreturn;
862 ecb_inline void ecb_unreachable (void) { }
865 /* try to tell the compiler that some condition is definitely true */
866 #define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
868 ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const;
869 ecb_inline unsigned char
870 ecb_byteorder_helper (void)
872 const uint32_t u = 0x11223344;
873 return *(unsigned char *)&u;
876 ecb_inline ecb_bool ecb_big_endian (void) ecb_const;
877 ecb_inline ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
878 ecb_inline ecb_bool ecb_little_endian (void) ecb_const;
879 ecb_inline ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
881 #if ECB_GCC_VERSION(3,0) || ECB_C99
882 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
884 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
889 static inline T ecb_div_rd (T val, T div)
891 return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
894 static inline T ecb_div_ru (T val, T div)
896 return val < 0 ? - ((-val ) / div) : (val + div - 1) / div;
899 #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
900 #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
903 #if ecb_cplusplus_does_not_suck
904 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
905 template<typename T, int N>
906 static inline int ecb_array_length (const T (&arr)[N])
911 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
918 #if ECB_MEMORY_FENCE_NEEDS_PTHREADS
919 /* if your architecture doesn't need memory fences, e.g. because it is
920 * single-cpu/core, or if you use libev in a project that doesn't use libev
921 * from multiple threads, then you can define ECB_AVOID_PTHREADS when compiling
922 * libev, in which cases the memory fences become nops.
923 * alternatively, you can remove this #error and link against libpthread,
924 * which will then provide the memory fences.
926 # error "memory fences not defined for your architecture, please report"
929 #ifndef ECB_MEMORY_FENCE
930 # define ECB_MEMORY_FENCE do { } while (0)
931 # define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
932 # define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
935 #define expect_false(cond) ecb_expect_false (cond)
936 #define expect_true(cond) ecb_expect_true (cond)
937 #define noinline ecb_noinline
939 #define inline_size ecb_inline
942 # define inline_speed ecb_inline
944 # define inline_speed static noinline
947 #define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
949 #if EV_MINPRI == EV_MAXPRI
950 # define ABSPRI(w) (((W)w), 0)
952 # define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
955 #define EMPTY /* required for microsofts broken pseudo-c compiler */
956 #define EMPTY2(a,b) /* used to suppress some warnings */
958 typedef ev_watcher *W;
959 typedef ev_watcher_list *WL;
960 typedef ev_watcher_time *WT;
962 #define ev_active(w) ((W)(w))->active
963 #define ev_at(w) ((WT)(w))->at
966 /* sig_atomic_t is used to avoid per-thread variables or locking but still */
967 /* giving it a reasonably high chance of working on typical architectures */
968 static EV_ATOMIC_T have_realtime; /* did clock_gettime (CLOCK_REALTIME) work? */
972 static EV_ATOMIC_T have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
975 #ifndef EV_FD_TO_WIN32_HANDLE
976 # define EV_FD_TO_WIN32_HANDLE(fd) _get_osfhandle (fd)
978 #ifndef EV_WIN32_HANDLE_TO_FD
979 # define EV_WIN32_HANDLE_TO_FD(handle) _open_osfhandle (handle, 0)
981 #ifndef EV_WIN32_CLOSE_FD
982 # define EV_WIN32_CLOSE_FD(fd) close (fd)
986 # include "ev_win32.c"
989 /*****************************************************************************/
991 /* define a suitable floor function (only used by periodics atm) */
995 # define ev_floor(v) floor (v)
1000 /* a floor() replacement function, should be independent of ev_tstamp type */
1001 static ev_tstamp noinline
1002 ev_floor (ev_tstamp v)
1004 /* the choice of shift factor is not terribly important */
1005 #if FLT_RADIX != 2 /* assume FLT_RADIX == 10 */
1006 const ev_tstamp shift = sizeof (unsigned long) >= 8 ? 10000000000000000000. : 1000000000.;
1008 const ev_tstamp shift = sizeof (unsigned long) >= 8 ? 18446744073709551616. : 4294967296.;
1011 /* argument too large for an unsigned long? */
1012 if (expect_false (v >= shift))
1017 return v; /* very large number */
1019 f = shift * ev_floor (v * (1. / shift));
1020 return f + ev_floor (v - f);
1023 /* special treatment for negative args? */
1024 if (expect_false (v < 0.))
1026 ev_tstamp f = -ev_floor (-v);
1028 return f - (f == v ? 0 : 1);
1031 /* fits into an unsigned long */
1032 return (unsigned long)v;
1037 /*****************************************************************************/
1040 # include <sys/utsname.h>
1043 static unsigned int noinline ecb_cold
1044 ev_linux_version (void)
1050 char *p = buf.release;
1055 for (i = 3+1; --i; )
1061 if (*p >= '0' && *p <= '9')
1062 c = c * 10 + *p++ - '0';
1079 /*****************************************************************************/
1082 static void noinline ecb_cold
1083 ev_printerr (const char *msg)
1085 write (STDERR_FILENO, msg, strlen (msg));
1089 static void (*syserr_cb)(const char *msg);
1092 ev_set_syserr_cb (void (*cb)(const char *msg))
1097 static void noinline ecb_cold
1098 ev_syserr (const char *msg)
1101 msg = "(libev) system error";
1110 ev_printerr (strerror (errno));
1120 ev_realloc_emul (void *ptr, long size)
1123 return realloc (ptr, size);
1125 /* some systems, notably openbsd and darwin, fail to properly
1126 * implement realloc (x, 0) (as required by both ansi c-89 and
1127 * the single unix specification, so work around them here.
1131 return realloc (ptr, size);
1138 static void *(*alloc)(void *ptr, long size) = ev_realloc_emul;
1141 ev_set_allocator (void *(*cb)(void *ptr, long size))
1147 ev_realloc (void *ptr, long size)
1149 ptr = alloc (ptr, size);
1154 ev_printerr ("(libev) memory allocation failed, aborting.\n");
1156 fprintf (stderr, "(libev) cannot allocate %ld bytes, aborting.", size);
1164 #define ev_malloc(size) ev_realloc (0, (size))
1165 #define ev_free(ptr) ev_realloc ((ptr), 0)
1167 /*****************************************************************************/
1169 /* set in reify when reification needed */
1170 #define EV_ANFD_REIFY 1
1172 /* file descriptor info structure */
1176 unsigned char events; /* the events watched for */
1177 unsigned char reify; /* flag set when this ANFD needs reification (EV_ANFD_REIFY, EV__IOFDSET) */
1178 unsigned char emask; /* the epoll backend stores the actual kernel mask in here */
1179 unsigned char unused;
1181 unsigned int egen; /* generation counter to counter epoll bugs */
1183 #if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
1191 /* stores the pending event set for a given watcher */
1195 int events; /* the pending event set for the given watcher */
1199 /* hash table entry per inotify-id */
1207 #if EV_HEAP_CACHE_AT
1208 /* a heap element */
1214 #define ANHE_w(he) (he).w /* access watcher, read-write */
1215 #define ANHE_at(he) (he).at /* access cached at, read-only */
1216 #define ANHE_at_cache(he) (he).at = (he).w->at /* update at from watcher */
1218 /* a heap element */
1221 #define ANHE_w(he) (he)
1222 #define ANHE_at(he) (he)->at
1223 #define ANHE_at_cache(he)
1230 ev_tstamp ev_rt_now;
1231 #define ev_rt_now ((loop)->ev_rt_now)
1232 #define VAR(name,decl) decl;
1233 #include "ev_vars.h"
1236 #include "ev_wrap.h"
1238 static struct ev_loop default_loop_struct;
1239 EV_API_DECL struct ev_loop *ev_default_loop_ptr = 0; /* needs to be initialised to make it a definition despite extern */
1243 EV_API_DECL ev_tstamp ev_rt_now = 0; /* needs to be initialised to make it a definition despite extern */
1244 #define VAR(name,decl) static decl;
1245 #include "ev_vars.h"
1248 static int ev_default_loop_ptr;
1253 # define EV_RELEASE_CB if (expect_false (release_cb)) release_cb (EV_A)
1254 # define EV_ACQUIRE_CB if (expect_false (acquire_cb)) acquire_cb (EV_A)
1255 # define EV_INVOKE_PENDING invoke_cb (EV_A)
1257 # define EV_RELEASE_CB (void)0
1258 # define EV_ACQUIRE_CB (void)0
1259 # define EV_INVOKE_PENDING ev_invoke_pending (EV_A)
1262 #define EVBREAK_RECURSE 0x80
1264 /*****************************************************************************/
1266 #ifndef EV_HAVE_EV_TIME
1271 if (expect_true (have_realtime))
1274 clock_gettime (CLOCK_REALTIME, &ts);
1275 return ts.tv_sec + ts.tv_nsec * 1e-9;
1280 gettimeofday (&tv, 0);
1281 return tv.tv_sec + tv.tv_usec * 1e-6;
1285 inline_size ev_tstamp
1288 #if EV_USE_MONOTONIC
1289 if (expect_true (have_monotonic))
1292 clock_gettime (CLOCK_MONOTONIC, &ts);
1293 return ts.tv_sec + ts.tv_nsec * 1e-9;
1309 ev_sleep (ev_tstamp delay)
1313 #if EV_USE_NANOSLEEP
1316 EV_TS_SET (ts, delay);
1318 #elif defined(_WIN32)
1319 Sleep ((unsigned long)(delay * 1e3));
1323 /* here we rely on sys/time.h + sys/types.h + unistd.h providing select */
1324 /* something not guaranteed by newer posix versions, but guaranteed */
1326 EV_TV_SET (tv, delay);
1327 select (0, 0, 0, 0, &tv);
1332 /*****************************************************************************/
1334 #define MALLOC_ROUND 4096 /* prefer to allocate in chunks of this size, must be 2**n and >> 4 longs */
1336 /* find a suitable new size for the given array, */
1337 /* hopefully by rounding to a nice-to-malloc size */
1339 array_nextsize (int elem, int cur, int cnt)
1347 /* if size is large, round to MALLOC_ROUND - 4 * longs to accommodate malloc overhead */
1348 if (elem * ncur > MALLOC_ROUND - sizeof (void *) * 4)
1351 ncur = (ncur + elem + (MALLOC_ROUND - 1) + sizeof (void *) * 4) & ~(MALLOC_ROUND - 1);
1352 ncur = ncur - sizeof (void *) * 4;
1359 static void * noinline ecb_cold
1360 array_realloc (int elem, void *base, int *cur, int cnt)
1362 *cur = array_nextsize (elem, *cur, cnt);
1363 return ev_realloc (base, elem * *cur);
1366 #define array_init_zero(base,count) \
1367 memset ((void *)(base), 0, sizeof (*(base)) * (count))
1369 #define array_needsize(type,base,cur,cnt,init) \
1370 if (expect_false ((cnt) > (cur))) \
1372 int ecb_unused ocur_ = (cur); \
1373 (base) = (type *)array_realloc \
1374 (sizeof (type), (base), &(cur), (cnt)); \
1375 init ((base) + (ocur_), (cur) - ocur_); \
1379 #define array_slim(type,stem) \
1380 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
1382 stem ## max = array_roundsize (stem ## cnt >> 1); \
1383 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
1384 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
1388 #define array_free(stem, idx) \
1389 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0; stem ## s idx = 0
1391 /*****************************************************************************/
1393 /* dummy callback for pending events */
1394 static void noinline
1395 pendingcb (EV_P_ ev_prepare *w, int revents)
1400 ev_feed_event (EV_P_ void *w, int revents)
1403 int pri = ABSPRI (w_);
1405 if (expect_false (w_->pending))
1406 pendings [pri][w_->pending - 1].events |= revents;
1409 w_->pending = ++pendingcnt [pri];
1410 array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
1411 pendings [pri][w_->pending - 1].w = w_;
1412 pendings [pri][w_->pending - 1].events = revents;
1417 feed_reverse (EV_P_ W w)
1419 array_needsize (W, rfeeds, rfeedmax, rfeedcnt + 1, EMPTY2);
1420 rfeeds [rfeedcnt++] = w;
1424 feed_reverse_done (EV_P_ int revents)
1427 ev_feed_event (EV_A_ rfeeds [--rfeedcnt], revents);
1432 queue_events (EV_P_ W *events, int eventcnt, int type)
1436 for (i = 0; i < eventcnt; ++i)
1437 ev_feed_event (EV_A_ events [i], type);
1440 /*****************************************************************************/
1443 fd_event_nocheck (EV_P_ int fd, int revents)
1445 ANFD *anfd = anfds + fd;
1448 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
1450 int ev = w->events & revents;
1453 ev_feed_event (EV_A_ (W)w, ev);
1457 /* do not submit kernel events for fds that have reify set */
1458 /* because that means they changed while we were polling for new events */
1460 fd_event (EV_P_ int fd, int revents)
1462 ANFD *anfd = anfds + fd;
1464 if (expect_true (!anfd->reify))
1465 fd_event_nocheck (EV_A_ fd, revents);
1469 ev_feed_fd_event (EV_P_ int fd, int revents)
1471 if (fd >= 0 && fd < anfdmax)
1472 fd_event_nocheck (EV_A_ fd, revents);
1475 /* make sure the external fd watch events are in-sync */
1476 /* with the kernel/libev internal state */
1482 #if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
1483 for (i = 0; i < fdchangecnt; ++i)
1485 int fd = fdchanges [i];
1486 ANFD *anfd = anfds + fd;
1488 if (anfd->reify & EV__IOFDSET && anfd->head)
1490 SOCKET handle = EV_FD_TO_WIN32_HANDLE (fd);
1492 if (handle != anfd->handle)
1496 assert (("libev: only socket fds supported in this configuration", ioctlsocket (handle, FIONREAD, &arg) == 0));
1498 /* handle changed, but fd didn't - we need to do it in two steps */
1499 backend_modify (EV_A_ fd, anfd->events, 0);
1501 anfd->handle = handle;
1507 for (i = 0; i < fdchangecnt; ++i)
1509 int fd = fdchanges [i];
1510 ANFD *anfd = anfds + fd;
1513 unsigned char o_events = anfd->events;
1514 unsigned char o_reify = anfd->reify;
1518 /*if (expect_true (o_reify & EV_ANFD_REIFY)) probably a deoptimisation */
1522 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
1523 anfd->events |= (unsigned char)w->events;
1525 if (o_events != anfd->events)
1526 o_reify = EV__IOFDSET; /* actually |= */
1529 if (o_reify & EV__IOFDSET)
1530 backend_modify (EV_A_ fd, o_events, anfd->events);
1536 /* something about the given fd changed */
1538 fd_change (EV_P_ int fd, int flags)
1540 unsigned char reify = anfds [fd].reify;
1541 anfds [fd].reify |= flags;
1543 if (expect_true (!reify))
1546 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
1547 fdchanges [fdchangecnt - 1] = fd;
1551 /* the given fd is invalid/unusable, so make sure it doesn't hurt us anymore */
1552 inline_speed void ecb_cold
1553 fd_kill (EV_P_ int fd)
1557 while ((w = (ev_io *)anfds [fd].head))
1559 ev_io_stop (EV_A_ w);
1560 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
1564 /* check whether the given fd is actually valid, for error recovery */
1565 inline_size int ecb_cold
1569 return EV_FD_TO_WIN32_HANDLE (fd) != -1;
1571 return fcntl (fd, F_GETFD) != -1;
1575 /* called on EBADF to verify fds */
1576 static void noinline ecb_cold
1581 for (fd = 0; fd < anfdmax; ++fd)
1582 if (anfds [fd].events)
1583 if (!fd_valid (fd) && errno == EBADF)
1587 /* called on ENOMEM in select/poll to kill some fds and retry */
1588 static void noinline ecb_cold
1593 for (fd = anfdmax; fd--; )
1594 if (anfds [fd].events)
1601 /* usually called after fork if backend needs to re-arm all fds from scratch */
1602 static void noinline
1607 for (fd = 0; fd < anfdmax; ++fd)
1608 if (anfds [fd].events)
1610 anfds [fd].events = 0;
1611 anfds [fd].emask = 0;
1612 fd_change (EV_A_ fd, EV__IOFDSET | EV_ANFD_REIFY);
1616 /* used to prepare libev internal fd's */
1617 /* this is not fork-safe */
1622 unsigned long arg = 1;
1623 ioctlsocket (EV_FD_TO_WIN32_HANDLE (fd), FIONBIO, &arg);
1625 fcntl (fd, F_SETFD, FD_CLOEXEC);
1626 fcntl (fd, F_SETFL, O_NONBLOCK);
1630 /*****************************************************************************/
1633 * the heap functions want a real array index. array index 0 is guaranteed to not
1634 * be in-use at any time. the first heap entry is at array [HEAP0]. DHEAP gives
1635 * the branching factor of the d-tree.
1639 * at the moment we allow libev the luxury of two heaps,
1640 * a small-code-size 2-heap one and a ~1.5kb larger 4-heap
1641 * which is more cache-efficient.
1642 * the difference is about 5% with 50000+ watchers.
1647 #define HEAP0 (DHEAP - 1) /* index of first element in heap */
1648 #define HPARENT(k) ((((k) - HEAP0 - 1) / DHEAP) + HEAP0)
1649 #define UPHEAP_DONE(p,k) ((p) == (k))
1651 /* away from the root */
1653 downheap (ANHE *heap, int N, int k)
1656 ANHE *E = heap + N + HEAP0;
1662 ANHE *pos = heap + DHEAP * (k - HEAP0) + HEAP0 + 1;
1664 /* find minimum child */
1665 if (expect_true (pos + DHEAP - 1 < E))
1667 /* fast path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1668 if ( ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1669 if ( ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1670 if ( ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1674 /* slow path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1675 if (pos + 1 < E && ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1676 if (pos + 2 < E && ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1677 if (pos + 3 < E && ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1682 if (ANHE_at (he) <= minat)
1686 ev_active (ANHE_w (*minpos)) = k;
1692 ev_active (ANHE_w (he)) = k;
1698 #define HPARENT(k) ((k) >> 1)
1699 #define UPHEAP_DONE(p,k) (!(p))
1701 /* away from the root */
1703 downheap (ANHE *heap, int N, int k)
1714 c += c + 1 < N + HEAP0 && ANHE_at (heap [c]) > ANHE_at (heap [c + 1])
1717 if (ANHE_at (he) <= ANHE_at (heap [c]))
1720 heap [k] = heap [c];
1721 ev_active (ANHE_w (heap [k])) = k;
1727 ev_active (ANHE_w (he)) = k;
1731 /* towards the root */
1733 upheap (ANHE *heap, int k)
1739 int p = HPARENT (k);
1741 if (UPHEAP_DONE (p, k) || ANHE_at (heap [p]) <= ANHE_at (he))
1744 heap [k] = heap [p];
1745 ev_active (ANHE_w (heap [k])) = k;
1750 ev_active (ANHE_w (he)) = k;
1753 /* move an element suitably so it is in a correct place */
1755 adjustheap (ANHE *heap, int N, int k)
1757 if (k > HEAP0 && ANHE_at (heap [k]) <= ANHE_at (heap [HPARENT (k)]))
1760 downheap (heap, N, k);
1763 /* rebuild the heap: this function is used only once and executed rarely */
1765 reheap (ANHE *heap, int N)
1769 /* we don't use floyds algorithm, upheap is simpler and is more cache-efficient */
1770 /* also, this is easy to implement and correct for both 2-heaps and 4-heaps */
1771 for (i = 0; i < N; ++i)
1772 upheap (heap, i + HEAP0);
1775 /*****************************************************************************/
1777 /* associate signal watchers to a signal signal */
1780 EV_ATOMIC_T pending;
1787 static ANSIG signals [EV_NSIG - 1];
1789 /*****************************************************************************/
1791 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
1793 static void noinline ecb_cold
1796 if (!ev_is_active (&pipe_w))
1799 evfd = eventfd (0, EFD_NONBLOCK | EFD_CLOEXEC);
1800 if (evfd < 0 && errno == EINVAL)
1801 evfd = eventfd (0, 0);
1806 fd_intern (evfd); /* doing it twice doesn't hurt */
1807 ev_io_set (&pipe_w, evfd, EV_READ);
1812 while (pipe (evpipe))
1813 ev_syserr ("(libev) error creating signal/async pipe");
1815 fd_intern (evpipe [0]);
1816 fd_intern (evpipe [1]);
1817 ev_io_set (&pipe_w, evpipe [0], EV_READ);
1820 ev_io_start (EV_A_ &pipe_w);
1821 ev_unref (EV_A); /* watcher should not keep loop alive */
1826 evpipe_write (EV_P_ EV_ATOMIC_T *flag)
1828 if (expect_true (*flag))
1833 ECB_MEMORY_FENCE_RELEASE; /* make sure flag is visible before the wakeup */
1835 pipe_write_skipped = 1;
1837 ECB_MEMORY_FENCE; /* make sure pipe_write_skipped is visible before we check pipe_write_wanted */
1839 if (pipe_write_wanted)
1843 pipe_write_skipped = 0; /* just an optimisation, no fence needed */
1845 old_errno = errno; /* save errno because write will clobber it */
1850 uint64_t counter = 1;
1851 write (evfd, &counter, sizeof (uint64_t));
1856 /* win32 people keep sending patches that change this write() to send() */
1857 /* and then run away. but send() is wrong, it wants a socket handle on win32 */
1858 /* so when you think this write should be a send instead, please find out */
1859 /* where your send() is from - it's definitely not the microsoft send, and */
1860 /* tell me. thank you. */
1861 write (evpipe [1], &(evpipe [1]), 1);
1868 /* called whenever the libev signal pipe */
1869 /* got some events (signal, async) */
1871 pipecb (EV_P_ ev_io *iow, int revents)
1875 if (revents & EV_READ)
1881 read (evfd, &counter, sizeof (uint64_t));
1887 /* see discussion in evpipe_write when you think this read should be recv in win32 */
1888 read (evpipe [0], &dummy, 1);
1892 pipe_write_skipped = 0;
1894 #if EV_SIGNAL_ENABLE
1899 for (i = EV_NSIG - 1; i--; )
1900 if (expect_false (signals [i].pending))
1901 ev_feed_signal_event (EV_A_ i + 1);
1910 for (i = asynccnt; i--; )
1911 if (asyncs [i]->sent)
1913 asyncs [i]->sent = 0;
1914 ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
1920 /*****************************************************************************/
1923 ev_feed_signal (int signum)
1926 EV_P = signals [signum - 1].loop;
1932 if (!ev_active (&pipe_w))
1935 signals [signum - 1].pending = 1;
1936 evpipe_write (EV_A_ &sig_pending);
1940 ev_sighandler (int signum)
1943 signal (signum, ev_sighandler);
1946 ev_feed_signal (signum);
1950 ev_feed_signal_event (EV_P_ int signum)
1954 if (expect_false (signum <= 0 || signum > EV_NSIG))
1960 /* it is permissible to try to feed a signal to the wrong loop */
1961 /* or, likely more useful, feeding a signal nobody is waiting for */
1963 if (expect_false (signals [signum].loop != EV_A))
1967 signals [signum].pending = 0;
1969 for (w = signals [signum].head; w; w = w->next)
1970 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
1975 sigfdcb (EV_P_ ev_io *iow, int revents)
1977 struct signalfd_siginfo si[2], *sip; /* these structs are big */
1981 ssize_t res = read (sigfd, si, sizeof (si));
1983 /* not ISO-C, as res might be -1, but works with SuS */
1984 for (sip = si; (char *)sip < (char *)si + res; ++sip)
1985 ev_feed_signal_event (EV_A_ sip->ssi_signo);
1987 if (res < (ssize_t)sizeof (si))
1995 /*****************************************************************************/
1998 static WL childs [EV_PID_HASHSIZE];
2000 static ev_signal childev;
2002 #ifndef WIFCONTINUED
2003 # define WIFCONTINUED(status) 0
2006 /* handle a single child status event */
2008 child_reap (EV_P_ int chain, int pid, int status)
2011 int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
2013 for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next)
2015 if ((w->pid == pid || !w->pid)
2016 && (!traced || (w->flags & 1)))
2018 ev_set_priority (w, EV_MAXPRI); /* need to do it *now*, this *must* be the same prio as the signal watcher itself */
2020 w->rstatus = status;
2021 ev_feed_event (EV_A_ (W)w, EV_CHILD);
2027 # define WCONTINUED 0
2030 /* called on sigchld etc., calls waitpid */
2032 childcb (EV_P_ ev_signal *sw, int revents)
2036 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
2037 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
2040 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
2043 /* make sure we are called again until all children have been reaped */
2044 /* we need to do it this way so that the callback gets called before we continue */
2045 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
2047 child_reap (EV_A_ pid, pid, status);
2048 if ((EV_PID_HASHSIZE) > 1)
2049 child_reap (EV_A_ 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
2054 /*****************************************************************************/
2057 # include "ev_iocp.c"
2060 # include "ev_port.c"
2063 # include "ev_kqueue.c"
2066 # include "ev_epoll.c"
2069 # include "ev_poll.c"
2072 # include "ev_select.c"
2076 ev_version_major (void)
2078 return EV_VERSION_MAJOR;
2082 ev_version_minor (void)
2084 return EV_VERSION_MINOR;
2087 /* return true if we are running with elevated privileges and should ignore env variables */
2088 int inline_size ecb_cold
2089 enable_secure (void)
2094 return getuid () != geteuid ()
2095 || getgid () != getegid ();
2099 unsigned int ecb_cold
2100 ev_supported_backends (void)
2102 unsigned int flags = 0;
2104 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
2105 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
2106 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
2107 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
2108 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
2113 unsigned int ecb_cold
2114 ev_recommended_backends (void)
2116 unsigned int flags = ev_supported_backends ();
2119 /* kqueue is borked on everything but netbsd apparently */
2120 /* it usually doesn't work correctly on anything but sockets and pipes */
2121 flags &= ~EVBACKEND_KQUEUE;
2124 /* only select works correctly on that "unix-certified" platform */
2125 flags &= ~EVBACKEND_KQUEUE; /* horribly broken, even for sockets */
2126 flags &= ~EVBACKEND_POLL; /* poll is based on kqueue from 10.5 onwards */
2129 flags &= ~EVBACKEND_POLL; /* poll return value is unusable (http://forums.freebsd.org/archive/index.php/t-10270.html) */
2135 unsigned int ecb_cold
2136 ev_embeddable_backends (void)
2138 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
2140 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
2141 if (ev_linux_version () < 0x020620) /* disable it on linux < 2.6.32 */
2142 flags &= ~EVBACKEND_EPOLL;
2167 ev_set_io_collect_interval (EV_P_ ev_tstamp interval)
2169 io_blocktime = interval;
2173 ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval)
2175 timeout_blocktime = interval;
2179 ev_set_userdata (EV_P_ void *data)
2191 ev_set_invoke_pending_cb (EV_P_ void (*invoke_pending_cb)(EV_P))
2193 invoke_cb = invoke_pending_cb;
2197 ev_set_loop_release_cb (EV_P_ void (*release)(EV_P), void (*acquire)(EV_P))
2199 release_cb = release;
2200 acquire_cb = acquire;
2204 /* initialise a loop structure, must be zero-initialised */
2205 static void noinline ecb_cold
2206 loop_init (EV_P_ unsigned int flags)
2217 if (!clock_gettime (CLOCK_REALTIME, &ts))
2222 #if EV_USE_MONOTONIC
2223 if (!have_monotonic)
2227 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
2232 /* pid check not overridable via env */
2234 if (flags & EVFLAG_FORKCHECK)
2238 if (!(flags & EVFLAG_NOENV)
2239 && !enable_secure ()
2240 && getenv ("LIBEV_FLAGS"))
2241 flags = atoi (getenv ("LIBEV_FLAGS"));
2243 ev_rt_now = ev_time ();
2244 mn_now = get_clock ();
2246 rtmn_diff = ev_rt_now - mn_now;
2248 invoke_cb = ev_invoke_pending;
2252 timeout_blocktime = 0.;
2259 pipe_write_skipped = 0;
2260 pipe_write_wanted = 0;
2262 fs_fd = flags & EVFLAG_NOINOTIFY ? -1 : -2;
2265 sigfd = flags & EVFLAG_SIGNALFD ? -2 : -1;
2268 if (!(flags & EVBACKEND_MASK))
2269 flags |= ev_recommended_backends ();
2272 if (!backend && (flags & EVBACKEND_IOCP )) backend = iocp_init (EV_A_ flags);
2275 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
2278 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
2281 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
2284 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
2287 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
2290 ev_prepare_init (&pending_w, pendingcb);
2292 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
2293 ev_init (&pipe_w, pipecb);
2294 ev_set_priority (&pipe_w, EV_MAXPRI);
2299 /* free up a loop structure */
2301 ev_loop_destroy (EV_P)
2306 /* mimic free (0) */
2311 #if EV_CLEANUP_ENABLE
2312 /* queue cleanup watchers (and execute them) */
2313 if (expect_false (cleanupcnt))
2315 queue_events (EV_A_ (W *)cleanups, cleanupcnt, EV_CLEANUP);
2321 if (ev_is_active (&childev))
2323 ev_ref (EV_A); /* child watcher */
2324 ev_signal_stop (EV_A_ &childev);
2328 if (ev_is_active (&pipe_w))
2331 /*ev_io_stop (EV_A_ &pipe_w);*/
2338 if (evpipe [0] >= 0)
2340 EV_WIN32_CLOSE_FD (evpipe [0]);
2341 EV_WIN32_CLOSE_FD (evpipe [1]);
2346 if (ev_is_active (&sigfd_w))
2355 if (backend_fd >= 0)
2359 if (backend == EVBACKEND_IOCP ) iocp_destroy (EV_A);
2362 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
2365 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
2368 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
2371 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
2374 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
2377 for (i = NUMPRI; i--; )
2379 array_free (pending, [i]);
2381 array_free (idle, [i]);
2385 ev_free (anfds); anfds = 0; anfdmax = 0;
2387 /* have to use the microsoft-never-gets-it-right macro */
2388 array_free (rfeed, EMPTY);
2389 array_free (fdchange, EMPTY);
2390 array_free (timer, EMPTY);
2391 #if EV_PERIODIC_ENABLE
2392 array_free (periodic, EMPTY);
2395 array_free (fork, EMPTY);
2397 #if EV_CLEANUP_ENABLE
2398 array_free (cleanup, EMPTY);
2400 array_free (prepare, EMPTY);
2401 array_free (check, EMPTY);
2403 array_free (async, EMPTY);
2409 if (ev_is_default_loop (EV_A))
2411 ev_default_loop_ptr = 0;
2419 inline_size void infy_fork (EV_P);
2426 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
2429 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
2432 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
2438 if (ev_is_active (&pipe_w))
2440 /* pipe_write_wanted must be false now, so modifying fd vars should be safe */
2443 ev_io_stop (EV_A_ &pipe_w);
2450 if (evpipe [0] >= 0)
2452 EV_WIN32_CLOSE_FD (evpipe [0]);
2453 EV_WIN32_CLOSE_FD (evpipe [1]);
2456 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
2458 /* now iterate over everything, in case we missed something */
2459 pipecb (EV_A_ &pipe_w, EV_READ);
2468 struct ev_loop * ecb_cold
2469 ev_loop_new (unsigned int flags)
2471 EV_P = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
2473 memset (EV_A, 0, sizeof (struct ev_loop));
2474 loop_init (EV_A_ flags);
2476 if (ev_backend (EV_A))
2483 #endif /* multiplicity */
2486 static void noinline ecb_cold
2487 verify_watcher (EV_P_ W w)
2489 assert (("libev: watcher has invalid priority", ABSPRI (w) >= 0 && ABSPRI (w) < NUMPRI));
2492 assert (("libev: pending watcher not on pending queue", pendings [ABSPRI (w)][w->pending - 1].w == w));
2495 static void noinline ecb_cold
2496 verify_heap (EV_P_ ANHE *heap, int N)
2500 for (i = HEAP0; i < N + HEAP0; ++i)
2502 assert (("libev: active index mismatch in heap", ev_active (ANHE_w (heap [i])) == i));
2503 assert (("libev: heap condition violated", i == HEAP0 || ANHE_at (heap [HPARENT (i)]) <= ANHE_at (heap [i])));
2504 assert (("libev: heap at cache mismatch", ANHE_at (heap [i]) == ev_at (ANHE_w (heap [i]))));
2506 verify_watcher (EV_A_ (W)ANHE_w (heap [i]));
2510 static void noinline ecb_cold
2511 array_verify (EV_P_ W *ws, int cnt)
2515 assert (("libev: active index mismatch", ev_active (ws [cnt]) == cnt + 1));
2516 verify_watcher (EV_A_ ws [cnt]);
2529 assert (activecnt >= -1);
2531 assert (fdchangemax >= fdchangecnt);
2532 for (i = 0; i < fdchangecnt; ++i)
2533 assert (("libev: negative fd in fdchanges", fdchanges [i] >= 0));
2535 assert (anfdmax >= 0);
2536 for (i = 0; i < anfdmax; ++i)
2537 for (w = anfds [i].head; w; w = w->next)
2539 verify_watcher (EV_A_ (W)w);
2540 assert (("libev: inactive fd watcher on anfd list", ev_active (w) == 1));
2541 assert (("libev: fd mismatch between watcher and anfd", ((ev_io *)w)->fd == i));
2544 assert (timermax >= timercnt);
2545 verify_heap (EV_A_ timers, timercnt);
2547 #if EV_PERIODIC_ENABLE
2548 assert (periodicmax >= periodiccnt);
2549 verify_heap (EV_A_ periodics, periodiccnt);
2552 for (i = NUMPRI; i--; )
2554 assert (pendingmax [i] >= pendingcnt [i]);
2556 assert (idleall >= 0);
2557 assert (idlemax [i] >= idlecnt [i]);
2558 array_verify (EV_A_ (W *)idles [i], idlecnt [i]);
2563 assert (forkmax >= forkcnt);
2564 array_verify (EV_A_ (W *)forks, forkcnt);
2567 #if EV_CLEANUP_ENABLE
2568 assert (cleanupmax >= cleanupcnt);
2569 array_verify (EV_A_ (W *)cleanups, cleanupcnt);
2573 assert (asyncmax >= asynccnt);
2574 array_verify (EV_A_ (W *)asyncs, asynccnt);
2577 #if EV_PREPARE_ENABLE
2578 assert (preparemax >= preparecnt);
2579 array_verify (EV_A_ (W *)prepares, preparecnt);
2583 assert (checkmax >= checkcnt);
2584 array_verify (EV_A_ (W *)checks, checkcnt);
2589 for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next)
2590 for (signum = EV_NSIG; signum--; ) if (signals [signum].pending)
2598 struct ev_loop * ecb_cold
2602 ev_default_loop (unsigned int flags)
2604 if (!ev_default_loop_ptr)
2607 EV_P = ev_default_loop_ptr = &default_loop_struct;
2609 ev_default_loop_ptr = 1;
2612 loop_init (EV_A_ flags);
2614 if (ev_backend (EV_A))
2617 ev_signal_init (&childev, childcb, SIGCHLD);
2618 ev_set_priority (&childev, EV_MAXPRI);
2619 ev_signal_start (EV_A_ &childev);
2620 ev_unref (EV_A); /* child watcher should not keep loop alive */
2624 ev_default_loop_ptr = 0;
2627 return ev_default_loop_ptr;
2633 postfork = 1; /* must be in line with ev_default_fork */
2636 /*****************************************************************************/
2639 ev_invoke (EV_P_ void *w, int revents)
2641 EV_CB_INVOKE ((W)w, revents);
2645 ev_pending_count (EV_P)
2648 unsigned int count = 0;
2650 for (pri = NUMPRI; pri--; )
2651 count += pendingcnt [pri];
2657 ev_invoke_pending (EV_P)
2661 for (pri = NUMPRI; pri--; )
2662 while (pendingcnt [pri])
2664 ANPENDING *p = pendings [pri] + --pendingcnt [pri];
2667 EV_CB_INVOKE (p->w, p->events);
2673 /* make idle watchers pending. this handles the "call-idle */
2674 /* only when higher priorities are idle" logic */
2678 if (expect_false (idleall))
2682 for (pri = NUMPRI; pri--; )
2684 if (pendingcnt [pri])
2689 queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
2697 /* make timers pending */
2703 if (timercnt && ANHE_at (timers [HEAP0]) < mn_now)
2707 ev_timer *w = (ev_timer *)ANHE_w (timers [HEAP0]);
2709 /*assert (("libev: inactive timer on timer heap detected", ev_is_active (w)));*/
2711 /* first reschedule or stop timer */
2714 ev_at (w) += w->repeat;
2715 if (ev_at (w) < mn_now)
2718 assert (("libev: negative ev_timer repeat value found while processing timers", w->repeat > 0.));
2720 ANHE_at_cache (timers [HEAP0]);
2721 downheap (timers, timercnt, HEAP0);
2724 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
2727 feed_reverse (EV_A_ (W)w);
2729 while (timercnt && ANHE_at (timers [HEAP0]) < mn_now);
2731 feed_reverse_done (EV_A_ EV_TIMER);
2735 #if EV_PERIODIC_ENABLE
2737 static void noinline
2738 periodic_recalc (EV_P_ ev_periodic *w)
2740 ev_tstamp interval = w->interval > MIN_INTERVAL ? w->interval : MIN_INTERVAL;
2741 ev_tstamp at = w->offset + interval * ev_floor ((ev_rt_now - w->offset) / interval);
2743 /* the above almost always errs on the low side */
2744 while (at <= ev_rt_now)
2746 ev_tstamp nat = at + w->interval;
2748 /* when resolution fails us, we use ev_rt_now */
2749 if (expect_false (nat == at))
2761 /* make periodics pending */
2763 periodics_reify (EV_P)
2767 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now)
2773 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [HEAP0]);
2775 /*assert (("libev: inactive timer on periodic heap detected", ev_is_active (w)));*/
2777 /* first reschedule or stop timer */
2778 if (w->reschedule_cb)
2780 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2782 assert (("libev: ev_periodic reschedule callback returned time in the past", ev_at (w) >= ev_rt_now));
2784 ANHE_at_cache (periodics [HEAP0]);
2785 downheap (periodics, periodiccnt, HEAP0);
2787 else if (w->interval)
2789 periodic_recalc (EV_A_ w);
2790 ANHE_at_cache (periodics [HEAP0]);
2791 downheap (periodics, periodiccnt, HEAP0);
2794 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
2797 feed_reverse (EV_A_ (W)w);
2799 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now);
2801 feed_reverse_done (EV_A_ EV_PERIODIC);
2805 /* simply recalculate all periodics */
2806 /* TODO: maybe ensure that at least one event happens when jumping forward? */
2807 static void noinline ecb_cold
2808 periodics_reschedule (EV_P)
2812 /* adjust periodics after time jump */
2813 for (i = HEAP0; i < periodiccnt + HEAP0; ++i)
2815 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [i]);
2817 if (w->reschedule_cb)
2818 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2819 else if (w->interval)
2820 periodic_recalc (EV_A_ w);
2822 ANHE_at_cache (periodics [i]);
2825 reheap (periodics, periodiccnt);
2829 /* adjust all timers by a given offset */
2830 static void noinline ecb_cold
2831 timers_reschedule (EV_P_ ev_tstamp adjust)
2835 for (i = 0; i < timercnt; ++i)
2837 ANHE *he = timers + i + HEAP0;
2838 ANHE_w (*he)->at += adjust;
2839 ANHE_at_cache (*he);
2843 /* fetch new monotonic and realtime times from the kernel */
2844 /* also detect if there was a timejump, and act accordingly */
2846 time_update (EV_P_ ev_tstamp max_block)
2848 #if EV_USE_MONOTONIC
2849 if (expect_true (have_monotonic))
2852 ev_tstamp odiff = rtmn_diff;
2854 mn_now = get_clock ();
2856 /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
2857 /* interpolate in the meantime */
2858 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
2860 ev_rt_now = rtmn_diff + mn_now;
2865 ev_rt_now = ev_time ();
2867 /* loop a few times, before making important decisions.
2868 * on the choice of "4": one iteration isn't enough,
2869 * in case we get preempted during the calls to
2870 * ev_time and get_clock. a second call is almost guaranteed
2871 * to succeed in that case, though. and looping a few more times
2872 * doesn't hurt either as we only do this on time-jumps or
2873 * in the unlikely event of having been preempted here.
2878 rtmn_diff = ev_rt_now - mn_now;
2880 diff = odiff - rtmn_diff;
2882 if (expect_true ((diff < 0. ? -diff : diff) < MIN_TIMEJUMP))
2883 return; /* all is well */
2885 ev_rt_now = ev_time ();
2886 mn_now = get_clock ();
2890 /* no timer adjustment, as the monotonic clock doesn't jump */
2891 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
2892 # if EV_PERIODIC_ENABLE
2893 periodics_reschedule (EV_A);
2899 ev_rt_now = ev_time ();
2901 if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
2903 /* adjust timers. this is easy, as the offset is the same for all of them */
2904 timers_reschedule (EV_A_ ev_rt_now - mn_now);
2905 #if EV_PERIODIC_ENABLE
2906 periodics_reschedule (EV_A);
2915 ev_run (EV_P_ int flags)
2921 assert (("libev: ev_loop recursion during release detected", loop_done != EVBREAK_RECURSE));
2923 loop_done = EVBREAK_CANCEL;
2925 EV_INVOKE_PENDING; /* in case we recurse, ensure ordering stays nice and clean */
2934 if (expect_false (curpid)) /* penalise the forking check even more */
2935 if (expect_false (getpid () != curpid))
2943 /* we might have forked, so queue fork handlers */
2944 if (expect_false (postfork))
2947 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
2952 #if EV_PREPARE_ENABLE
2953 /* queue prepare watchers (and execute them) */
2954 if (expect_false (preparecnt))
2956 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
2961 if (expect_false (loop_done))
2964 /* we might have forked, so reify kernel state if necessary */
2965 if (expect_false (postfork))
2968 /* update fd-related kernel structures */
2971 /* calculate blocking time */
2973 ev_tstamp waittime = 0.;
2974 ev_tstamp sleeptime = 0.;
2976 /* remember old timestamp for io_blocktime calculation */
2977 ev_tstamp prev_mn_now = mn_now;
2979 /* update time to cancel out callback processing overhead */
2980 time_update (EV_A_ 1e100);
2982 /* from now on, we want a pipe-wake-up */
2983 pipe_write_wanted = 1;
2985 ECB_MEMORY_FENCE; /* make sure pipe_write_wanted is visible before we check for potential skips */
2987 if (expect_true (!(flags & EVRUN_NOWAIT || idleall || !activecnt || pipe_write_skipped)))
2989 waittime = MAX_BLOCKTIME;
2993 ev_tstamp to = ANHE_at (timers [HEAP0]) - mn_now;
2994 if (waittime > to) waittime = to;
2997 #if EV_PERIODIC_ENABLE
3000 ev_tstamp to = ANHE_at (periodics [HEAP0]) - ev_rt_now;
3001 if (waittime > to) waittime = to;
3005 /* don't let timeouts decrease the waittime below timeout_blocktime */
3006 if (expect_false (waittime < timeout_blocktime))
3007 waittime = timeout_blocktime;
3009 /* at this point, we NEED to wait, so we have to ensure */
3010 /* to pass a minimum nonzero value to the backend */
3011 if (expect_false (waittime < backend_mintime))
3012 waittime = backend_mintime;
3014 /* extra check because io_blocktime is commonly 0 */
3015 if (expect_false (io_blocktime))
3017 sleeptime = io_blocktime - (mn_now - prev_mn_now);
3019 if (sleeptime > waittime - backend_mintime)
3020 sleeptime = waittime - backend_mintime;
3022 if (expect_true (sleeptime > 0.))
3024 ev_sleep (sleeptime);
3025 waittime -= sleeptime;
3033 assert ((loop_done = EVBREAK_RECURSE, 1)); /* assert for side effect */
3034 backend_poll (EV_A_ waittime);
3035 assert ((loop_done = EVBREAK_CANCEL, 1)); /* assert for side effect */
3037 pipe_write_wanted = 0; /* just an optimisation, no fence needed */
3039 if (pipe_write_skipped)
3041 assert (("libev: pipe_w not active, but pipe not written", ev_is_active (&pipe_w)));
3042 ev_feed_event (EV_A_ &pipe_w, EV_CUSTOM);
3046 /* update ev_rt_now, do magic */
3047 time_update (EV_A_ waittime + sleeptime);
3050 /* queue pending timers and reschedule them */
3051 timers_reify (EV_A); /* relative timers called last */
3052 #if EV_PERIODIC_ENABLE
3053 periodics_reify (EV_A); /* absolute timers called first */
3057 /* queue idle watchers unless other events are pending */
3062 /* queue check watchers, to be executed first */
3063 if (expect_false (checkcnt))
3064 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
3069 while (expect_true (
3072 && !(flags & (EVRUN_ONCE | EVRUN_NOWAIT))
3075 if (loop_done == EVBREAK_ONE)
3076 loop_done = EVBREAK_CANCEL;
3084 ev_break (EV_P_ int how)
3102 ev_now_update (EV_P)
3104 time_update (EV_A_ 1e100);
3110 ev_now_update (EV_A);
3116 ev_tstamp mn_prev = mn_now;
3118 ev_now_update (EV_A);
3119 timers_reschedule (EV_A_ mn_now - mn_prev);
3120 #if EV_PERIODIC_ENABLE
3121 /* TODO: really do this? */
3122 periodics_reschedule (EV_A);
3126 /*****************************************************************************/
3127 /* singly-linked list management, used when the expected list length is short */
3130 wlist_add (WL *head, WL elem)
3137 wlist_del (WL *head, WL elem)
3141 if (expect_true (*head == elem))
3147 head = &(*head)->next;
3151 /* internal, faster, version of ev_clear_pending */
3153 clear_pending (EV_P_ W w)
3157 pendings [ABSPRI (w)][w->pending - 1].w = (W)&pending_w;
3163 ev_clear_pending (EV_P_ void *w)
3166 int pending = w_->pending;
3168 if (expect_true (pending))
3170 ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
3171 p->w = (W)&pending_w;
3180 pri_adjust (EV_P_ W w)
3182 int pri = ev_priority (w);
3183 pri = pri < EV_MINPRI ? EV_MINPRI : pri;
3184 pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
3185 ev_set_priority (w, pri);
3189 ev_start (EV_P_ W w, int active)
3191 pri_adjust (EV_A_ w);
3203 /*****************************************************************************/
3206 ev_io_start (EV_P_ ev_io *w)
3210 if (expect_false (ev_is_active (w)))
3213 assert (("libev: ev_io_start called with negative fd", fd >= 0));
3214 assert (("libev: ev_io_start called with illegal event mask", !(w->events & ~(EV__IOFDSET | EV_READ | EV_WRITE))));
3218 ev_start (EV_A_ (W)w, 1);
3219 array_needsize (ANFD, anfds, anfdmax, fd + 1, array_init_zero);
3220 wlist_add (&anfds[fd].head, (WL)w);
3222 fd_change (EV_A_ fd, w->events & EV__IOFDSET | EV_ANFD_REIFY);
3223 w->events &= ~EV__IOFDSET;
3229 ev_io_stop (EV_P_ ev_io *w)
3231 clear_pending (EV_A_ (W)w);
3232 if (expect_false (!ev_is_active (w)))
3235 assert (("libev: ev_io_stop called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
3239 wlist_del (&anfds[w->fd].head, (WL)w);
3240 ev_stop (EV_A_ (W)w);
3242 fd_change (EV_A_ w->fd, EV_ANFD_REIFY);
3248 ev_timer_start (EV_P_ ev_timer *w)
3250 if (expect_false (ev_is_active (w)))
3253 ev_at (w) += mn_now;
3255 assert (("libev: ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
3260 ev_start (EV_A_ (W)w, timercnt + HEAP0 - 1);
3261 array_needsize (ANHE, timers, timermax, ev_active (w) + 1, EMPTY2);
3262 ANHE_w (timers [ev_active (w)]) = (WT)w;
3263 ANHE_at_cache (timers [ev_active (w)]);
3264 upheap (timers, ev_active (w));
3268 /*assert (("libev: internal timer heap corruption", timers [ev_active (w)] == (WT)w));*/
3272 ev_timer_stop (EV_P_ ev_timer *w)
3274 clear_pending (EV_A_ (W)w);
3275 if (expect_false (!ev_is_active (w)))
3281 int active = ev_active (w);
3283 assert (("libev: internal timer heap corruption", ANHE_w (timers [active]) == (WT)w));
3287 if (expect_true (active < timercnt + HEAP0))
3289 timers [active] = timers [timercnt + HEAP0];
3290 adjustheap (timers, timercnt, active);
3294 ev_at (w) -= mn_now;
3296 ev_stop (EV_A_ (W)w);
3302 ev_timer_again (EV_P_ ev_timer *w)
3306 clear_pending (EV_A_ (W)w);
3308 if (ev_is_active (w))
3312 ev_at (w) = mn_now + w->repeat;
3313 ANHE_at_cache (timers [ev_active (w)]);
3314 adjustheap (timers, timercnt, ev_active (w));
3317 ev_timer_stop (EV_A_ w);
3321 ev_at (w) = w->repeat;
3322 ev_timer_start (EV_A_ w);
3329 ev_timer_remaining (EV_P_ ev_timer *w)
3331 return ev_at (w) - (ev_is_active (w) ? mn_now : 0.);
3334 #if EV_PERIODIC_ENABLE
3336 ev_periodic_start (EV_P_ ev_periodic *w)
3338 if (expect_false (ev_is_active (w)))
3341 if (w->reschedule_cb)
3342 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
3343 else if (w->interval)
3345 assert (("libev: ev_periodic_start called with negative interval value", w->interval >= 0.));
3346 periodic_recalc (EV_A_ w);
3349 ev_at (w) = w->offset;
3354 ev_start (EV_A_ (W)w, periodiccnt + HEAP0 - 1);
3355 array_needsize (ANHE, periodics, periodicmax, ev_active (w) + 1, EMPTY2);
3356 ANHE_w (periodics [ev_active (w)]) = (WT)w;
3357 ANHE_at_cache (periodics [ev_active (w)]);
3358 upheap (periodics, ev_active (w));
3362 /*assert (("libev: internal periodic heap corruption", ANHE_w (periodics [ev_active (w)]) == (WT)w));*/
3366 ev_periodic_stop (EV_P_ ev_periodic *w)
3368 clear_pending (EV_A_ (W)w);
3369 if (expect_false (!ev_is_active (w)))
3375 int active = ev_active (w);
3377 assert (("libev: internal periodic heap corruption", ANHE_w (periodics [active]) == (WT)w));
3381 if (expect_true (active < periodiccnt + HEAP0))
3383 periodics [active] = periodics [periodiccnt + HEAP0];
3384 adjustheap (periodics, periodiccnt, active);
3388 ev_stop (EV_A_ (W)w);
3394 ev_periodic_again (EV_P_ ev_periodic *w)
3396 /* TODO: use adjustheap and recalculation */
3397 ev_periodic_stop (EV_A_ w);
3398 ev_periodic_start (EV_A_ w);
3403 # define SA_RESTART 0
3406 #if EV_SIGNAL_ENABLE
3409 ev_signal_start (EV_P_ ev_signal *w)
3411 if (expect_false (ev_is_active (w)))
3414 assert (("libev: ev_signal_start called with illegal signal number", w->signum > 0 && w->signum < EV_NSIG));
3417 assert (("libev: a signal must not be attached to two different loops",
3418 !signals [w->signum - 1].loop || signals [w->signum - 1].loop == loop));
3420 signals [w->signum - 1].loop = EV_A;
3428 sigfd = signalfd (-1, &sigfd_set, SFD_NONBLOCK | SFD_CLOEXEC);
3429 if (sigfd < 0 && errno == EINVAL)
3430 sigfd = signalfd (-1, &sigfd_set, 0); /* retry without flags */
3434 fd_intern (sigfd); /* doing it twice will not hurt */
3436 sigemptyset (&sigfd_set);
3438 ev_io_init (&sigfd_w, sigfdcb, sigfd, EV_READ);
3439 ev_set_priority (&sigfd_w, EV_MAXPRI);
3440 ev_io_start (EV_A_ &sigfd_w);
3441 ev_unref (EV_A); /* signalfd watcher should not keep loop alive */
3447 /* TODO: check .head */
3448 sigaddset (&sigfd_set, w->signum);
3449 sigprocmask (SIG_BLOCK, &sigfd_set, 0);
3451 signalfd (sigfd, &sigfd_set, 0);
3455 ev_start (EV_A_ (W)w, 1);
3456 wlist_add (&signals [w->signum - 1].head, (WL)w);
3459 # if EV_USE_SIGNALFD
3460 if (sigfd < 0) /*TODO*/
3466 signal (w->signum, ev_sighandler);
3468 struct sigaction sa;
3472 sa.sa_handler = ev_sighandler;
3473 sigfillset (&sa.sa_mask);
3474 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
3475 sigaction (w->signum, &sa, 0);
3477 if (origflags & EVFLAG_NOSIGMASK)
3479 sigemptyset (&sa.sa_mask);
3480 sigaddset (&sa.sa_mask, w->signum);
3481 sigprocmask (SIG_UNBLOCK, &sa.sa_mask, 0);
3490 ev_signal_stop (EV_P_ ev_signal *w)
3492 clear_pending (EV_A_ (W)w);
3493 if (expect_false (!ev_is_active (w)))
3498 wlist_del (&signals [w->signum - 1].head, (WL)w);
3499 ev_stop (EV_A_ (W)w);
3501 if (!signals [w->signum - 1].head)
3504 signals [w->signum - 1].loop = 0; /* unattach from signal */
3512 sigaddset (&ss, w->signum);
3513 sigdelset (&sigfd_set, w->signum);
3515 signalfd (sigfd, &sigfd_set, 0);
3516 sigprocmask (SIG_UNBLOCK, &ss, 0);
3520 signal (w->signum, SIG_DFL);
3531 ev_child_start (EV_P_ ev_child *w)
3534 assert (("libev: child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
3536 if (expect_false (ev_is_active (w)))
3541 ev_start (EV_A_ (W)w, 1);
3542 wlist_add (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);
3548 ev_child_stop (EV_P_ ev_child *w)
3550 clear_pending (EV_A_ (W)w);
3551 if (expect_false (!ev_is_active (w)))
3556 wlist_del (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);
3557 ev_stop (EV_A_ (W)w);
3568 # define lstat(a,b) _stati64 (a,b)
3571 #define DEF_STAT_INTERVAL 5.0074891
3572 #define NFS_STAT_INTERVAL 30.1074891 /* for filesystems potentially failing inotify */
3573 #define MIN_STAT_INTERVAL 0.1074891
3575 static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
3579 /* the * 2 is to allow for alignment padding, which for some reason is >> 8 */
3580 # define EV_INOTIFY_BUFSIZE (sizeof (struct inotify_event) * 2 + NAME_MAX)
3582 static void noinline
3583 infy_add (EV_P_ ev_stat *w)
3585 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);
3591 /* now local changes will be tracked by inotify, but remote changes won't */
3592 /* unless the filesystem is known to be local, we therefore still poll */
3593 /* also do poll on <2.6.25, but with normal frequency */
3596 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3597 else if (!statfs (w->path, &sfs)
3598 && (sfs.f_type == 0x1373 /* devfs */
3599 || sfs.f_type == 0xEF53 /* ext2/3 */
3600 || sfs.f_type == 0x3153464a /* jfs */
3601 || sfs.f_type == 0x52654973 /* reiser3 */
3602 || sfs.f_type == 0x01021994 /* tempfs */
3603 || sfs.f_type == 0x58465342 /* xfs */))
3604 w->timer.repeat = 0.; /* filesystem is local, kernel new enough */
3606 w->timer.repeat = w->interval ? w->interval : NFS_STAT_INTERVAL; /* remote, use reduced frequency */
3610 /* can't use inotify, continue to stat */
3611 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3613 /* if path is not there, monitor some parent directory for speedup hints */
3614 /* note that exceeding the hardcoded path limit is not a correctness issue, */
3615 /* but an efficiency issue only */
3616 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
3619 strcpy (path, w->path);
3623 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
3624 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
3626 char *pend = strrchr (path, '/');
3628 if (!pend || pend == path)
3632 w->wd = inotify_add_watch (fs_fd, path, mask);
3634 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
3639 wlist_add (&fs_hash [w->wd & ((EV_INOTIFY_HASHSIZE) - 1)].head, (WL)w);
3641 /* now re-arm timer, if required */
3642 if (ev_is_active (&w->timer)) ev_ref (EV_A);
3643 ev_timer_again (EV_A_ &w->timer);
3644 if (ev_is_active (&w->timer)) ev_unref (EV_A);
3647 static void noinline
3648 infy_del (EV_P_ ev_stat *w)
3657 slot = wd & ((EV_INOTIFY_HASHSIZE) - 1);
3658 wlist_del (&fs_hash [slot].head, (WL)w);
3660 /* remove this watcher, if others are watching it, they will rearm */
3661 inotify_rm_watch (fs_fd, wd);
3664 static void noinline
3665 infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
3668 /* overflow, need to check for all hash slots */
3669 for (slot = 0; slot < (EV_INOTIFY_HASHSIZE); ++slot)
3670 infy_wd (EV_A_ slot, wd, ev);
3675 for (w_ = fs_hash [slot & ((EV_INOTIFY_HASHSIZE) - 1)].head; w_; )
3677 ev_stat *w = (ev_stat *)w_;
3678 w_ = w_->next; /* lets us remove this watcher and all before it */
3680 if (w->wd == wd || wd == -1)
3682 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
3684 wlist_del (&fs_hash [slot & ((EV_INOTIFY_HASHSIZE) - 1)].head, (WL)w);
3686 infy_add (EV_A_ w); /* re-add, no matter what */
3689 stat_timer_cb (EV_A_ &w->timer, 0);
3696 infy_cb (EV_P_ ev_io *w, int revents)
3698 char buf [EV_INOTIFY_BUFSIZE];
3700 int len = read (fs_fd, buf, sizeof (buf));
3702 for (ofs = 0; ofs < len; )
3704 struct inotify_event *ev = (struct inotify_event *)(buf + ofs);
3705 infy_wd (EV_A_ ev->wd, ev->wd, ev);
3706 ofs += sizeof (struct inotify_event) + ev->len;
3710 inline_size void ecb_cold
3711 ev_check_2625 (EV_P)
3713 /* kernels < 2.6.25 are borked
3714 * http://www.ussg.indiana.edu/hypermail/linux/kernel/0711.3/1208.html
3716 if (ev_linux_version () < 0x020619)
3725 #if defined (IN_CLOEXEC) && defined (IN_NONBLOCK)
3726 int fd = inotify_init1 (IN_CLOEXEC | IN_NONBLOCK);
3730 return inotify_init ();
3741 ev_check_2625 (EV_A);
3743 fs_fd = infy_newfd ();
3748 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
3749 ev_set_priority (&fs_w, EV_MAXPRI);
3750 ev_io_start (EV_A_ &fs_w);
3764 ev_io_stop (EV_A_ &fs_w);
3766 fs_fd = infy_newfd ();
3771 ev_io_set (&fs_w, fs_fd, EV_READ);
3772 ev_io_start (EV_A_ &fs_w);
3776 for (slot = 0; slot < (EV_INOTIFY_HASHSIZE); ++slot)
3778 WL w_ = fs_hash [slot].head;
3779 fs_hash [slot].head = 0;
3783 ev_stat *w = (ev_stat *)w_;
3784 w_ = w_->next; /* lets us add this watcher */
3789 infy_add (EV_A_ w); /* re-add, no matter what */
3792 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3793 if (ev_is_active (&w->timer)) ev_ref (EV_A);
3794 ev_timer_again (EV_A_ &w->timer);
3795 if (ev_is_active (&w->timer)) ev_unref (EV_A);
3804 # define EV_LSTAT(p,b) _stati64 (p, b)
3806 # define EV_LSTAT(p,b) lstat (p, b)
3810 ev_stat_stat (EV_P_ ev_stat *w)
3812 if (lstat (w->path, &w->attr) < 0)
3813 w->attr.st_nlink = 0;
3814 else if (!w->attr.st_nlink)
3815 w->attr.st_nlink = 1;
3818 static void noinline
3819 stat_timer_cb (EV_P_ ev_timer *w_, int revents)
3821 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
3823 ev_statdata prev = w->attr;
3824 ev_stat_stat (EV_A_ w);
3826 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
3828 prev.st_dev != w->attr.st_dev
3829 || prev.st_ino != w->attr.st_ino
3830 || prev.st_mode != w->attr.st_mode
3831 || prev.st_nlink != w->attr.st_nlink
3832 || prev.st_uid != w->attr.st_uid
3833 || prev.st_gid != w->attr.st_gid
3834 || prev.st_rdev != w->attr.st_rdev
3835 || prev.st_size != w->attr.st_size
3836 || prev.st_atime != w->attr.st_atime
3837 || prev.st_mtime != w->attr.st_mtime
3838 || prev.st_ctime != w->attr.st_ctime
3840 /* we only update w->prev on actual differences */
3841 /* in case we test more often than invoke the callback, */
3842 /* to ensure that prev is always different to attr */
3850 ev_stat_stat (EV_A_ w); /* avoid race... */
3854 ev_feed_event (EV_A_ w, EV_STAT);
3859 ev_stat_start (EV_P_ ev_stat *w)
3861 if (expect_false (ev_is_active (w)))
3864 ev_stat_stat (EV_A_ w);
3866 if (w->interval < MIN_STAT_INTERVAL && w->interval)
3867 w->interval = MIN_STAT_INTERVAL;
3869 ev_timer_init (&w->timer, stat_timer_cb, 0., w->interval ? w->interval : DEF_STAT_INTERVAL);
3870 ev_set_priority (&w->timer, ev_priority (w));
3880 ev_timer_again (EV_A_ &w->timer);
3884 ev_start (EV_A_ (W)w, 1);
3890 ev_stat_stop (EV_P_ ev_stat *w)
3892 clear_pending (EV_A_ (W)w);
3893 if (expect_false (!ev_is_active (w)))
3902 if (ev_is_active (&w->timer))
3905 ev_timer_stop (EV_A_ &w->timer);
3908 ev_stop (EV_A_ (W)w);
3916 ev_idle_start (EV_P_ ev_idle *w)
3918 if (expect_false (ev_is_active (w)))
3921 pri_adjust (EV_A_ (W)w);
3926 int active = ++idlecnt [ABSPRI (w)];
3929 ev_start (EV_A_ (W)w, active);
3931 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
3932 idles [ABSPRI (w)][active - 1] = w;
3939 ev_idle_stop (EV_P_ ev_idle *w)
3941 clear_pending (EV_A_ (W)w);
3942 if (expect_false (!ev_is_active (w)))
3948 int active = ev_active (w);
3950 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
3951 ev_active (idles [ABSPRI (w)][active - 1]) = active;
3953 ev_stop (EV_A_ (W)w);
3961 #if EV_PREPARE_ENABLE
3963 ev_prepare_start (EV_P_ ev_prepare *w)
3965 if (expect_false (ev_is_active (w)))
3970 ev_start (EV_A_ (W)w, ++preparecnt);
3971 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
3972 prepares [preparecnt - 1] = w;
3978 ev_prepare_stop (EV_P_ ev_prepare *w)
3980 clear_pending (EV_A_ (W)w);
3981 if (expect_false (!ev_is_active (w)))
3987 int active = ev_active (w);
3989 prepares [active - 1] = prepares [--preparecnt];
3990 ev_active (prepares [active - 1]) = active;
3993 ev_stop (EV_A_ (W)w);
4001 ev_check_start (EV_P_ ev_check *w)
4003 if (expect_false (ev_is_active (w)))
4008 ev_start (EV_A_ (W)w, ++checkcnt);
4009 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
4010 checks [checkcnt - 1] = w;
4016 ev_check_stop (EV_P_ ev_check *w)
4018 clear_pending (EV_A_ (W)w);
4019 if (expect_false (!ev_is_active (w)))
4025 int active = ev_active (w);
4027 checks [active - 1] = checks [--checkcnt];
4028 ev_active (checks [active - 1]) = active;
4031 ev_stop (EV_A_ (W)w);
4039 ev_embed_sweep (EV_P_ ev_embed *w)
4041 ev_run (w->other, EVRUN_NOWAIT);
4045 embed_io_cb (EV_P_ ev_io *io, int revents)
4047 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
4050 ev_feed_event (EV_A_ (W)w, EV_EMBED);
4052 ev_run (w->other, EVRUN_NOWAIT);
4056 embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
4058 ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
4066 ev_run (EV_A_ EVRUN_NOWAIT);
4072 embed_fork_cb (EV_P_ ev_fork *fork_w, int revents)
4074 ev_embed *w = (ev_embed *)(((char *)fork_w) - offsetof (ev_embed, fork));
4076 ev_embed_stop (EV_A_ w);
4081 ev_loop_fork (EV_A);
4082 ev_run (EV_A_ EVRUN_NOWAIT);
4085 ev_embed_start (EV_A_ w);
4090 embed_idle_cb (EV_P_ ev_idle *idle, int revents)
4092 ev_idle_stop (EV_A_ idle);
4097 ev_embed_start (EV_P_ ev_embed *w)
4099 if (expect_false (ev_is_active (w)))
4104 assert (("libev: loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
4105 ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
4110 ev_set_priority (&w->io, ev_priority (w));
4111 ev_io_start (EV_A_ &w->io);
4113 ev_prepare_init (&w->prepare, embed_prepare_cb);
4114 ev_set_priority (&w->prepare, EV_MINPRI);
4115 ev_prepare_start (EV_A_ &w->prepare);
4117 ev_fork_init (&w->fork, embed_fork_cb);
4118 ev_fork_start (EV_A_ &w->fork);
4120 /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
4122 ev_start (EV_A_ (W)w, 1);
4128 ev_embed_stop (EV_P_ ev_embed *w)
4130 clear_pending (EV_A_ (W)w);
4131 if (expect_false (!ev_is_active (w)))
4136 ev_io_stop (EV_A_ &w->io);
4137 ev_prepare_stop (EV_A_ &w->prepare);
4138 ev_fork_stop (EV_A_ &w->fork);
4140 ev_stop (EV_A_ (W)w);
4148 ev_fork_start (EV_P_ ev_fork *w)
4150 if (expect_false (ev_is_active (w)))
4155 ev_start (EV_A_ (W)w, ++forkcnt);
4156 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
4157 forks [forkcnt - 1] = w;
4163 ev_fork_stop (EV_P_ ev_fork *w)
4165 clear_pending (EV_A_ (W)w);
4166 if (expect_false (!ev_is_active (w)))
4172 int active = ev_active (w);
4174 forks [active - 1] = forks [--forkcnt];
4175 ev_active (forks [active - 1]) = active;
4178 ev_stop (EV_A_ (W)w);
4184 #if EV_CLEANUP_ENABLE
4186 ev_cleanup_start (EV_P_ ev_cleanup *w)
4188 if (expect_false (ev_is_active (w)))
4193 ev_start (EV_A_ (W)w, ++cleanupcnt);
4194 array_needsize (ev_cleanup *, cleanups, cleanupmax, cleanupcnt, EMPTY2);
4195 cleanups [cleanupcnt - 1] = w;
4197 /* cleanup watchers should never keep a refcount on the loop */
4203 ev_cleanup_stop (EV_P_ ev_cleanup *w)
4205 clear_pending (EV_A_ (W)w);
4206 if (expect_false (!ev_is_active (w)))
4213 int active = ev_active (w);
4215 cleanups [active - 1] = cleanups [--cleanupcnt];
4216 ev_active (cleanups [active - 1]) = active;
4219 ev_stop (EV_A_ (W)w);
4227 ev_async_start (EV_P_ ev_async *w)
4229 if (expect_false (ev_is_active (w)))
4238 ev_start (EV_A_ (W)w, ++asynccnt);
4239 array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
4240 asyncs [asynccnt - 1] = w;
4246 ev_async_stop (EV_P_ ev_async *w)
4248 clear_pending (EV_A_ (W)w);
4249 if (expect_false (!ev_is_active (w)))
4255 int active = ev_active (w);
4257 asyncs [active - 1] = asyncs [--asynccnt];
4258 ev_active (asyncs [active - 1]) = active;
4261 ev_stop (EV_A_ (W)w);
4267 ev_async_send (EV_P_ ev_async *w)
4270 evpipe_write (EV_A_ &async_pending);
4274 /*****************************************************************************/
4280 void (*cb)(int revents, void *arg);
4285 once_cb (EV_P_ struct ev_once *once, int revents)
4287 void (*cb)(int revents, void *arg) = once->cb;
4288 void *arg = once->arg;
4290 ev_io_stop (EV_A_ &once->io);
4291 ev_timer_stop (EV_A_ &once->to);
4298 once_cb_io (EV_P_ ev_io *w, int revents)
4300 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io));
4302 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->to));
4306 once_cb_to (EV_P_ ev_timer *w, int revents)
4308 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to));
4310 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->io));
4314 ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
4316 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
4318 if (expect_false (!once))
4320 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMER, arg);
4327 ev_init (&once->io, once_cb_io);
4330 ev_io_set (&once->io, fd, events);
4331 ev_io_start (EV_A_ &once->io);
4334 ev_init (&once->to, once_cb_to);
4337 ev_timer_set (&once->to, timeout, 0.);
4338 ev_timer_start (EV_A_ &once->to);
4342 /*****************************************************************************/
4346 ev_walk (EV_P_ int types, void (*cb)(EV_P_ int type, void *w))
4349 ev_watcher_list *wl, *wn;
4351 if (types & (EV_IO | EV_EMBED))
4352 for (i = 0; i < anfdmax; ++i)
4353 for (wl = anfds [i].head; wl; )
4358 if (ev_cb ((ev_io *)wl) == embed_io_cb)
4360 if (types & EV_EMBED)
4361 cb (EV_A_ EV_EMBED, ((char *)wl) - offsetof (struct ev_embed, io));
4366 if (ev_cb ((ev_io *)wl) == infy_cb)
4370 if ((ev_io *)wl != &pipe_w)
4372 cb (EV_A_ EV_IO, wl);
4377 if (types & (EV_TIMER | EV_STAT))
4378 for (i = timercnt + HEAP0; i-- > HEAP0; )
4380 /*TODO: timer is not always active*/
4381 if (ev_cb ((ev_timer *)ANHE_w (timers [i])) == stat_timer_cb)
4383 if (types & EV_STAT)
4384 cb (EV_A_ EV_STAT, ((char *)ANHE_w (timers [i])) - offsetof (struct ev_stat, timer));
4388 if (types & EV_TIMER)
4389 cb (EV_A_ EV_TIMER, ANHE_w (timers [i]));
4391 #if EV_PERIODIC_ENABLE
4392 if (types & EV_PERIODIC)
4393 for (i = periodiccnt + HEAP0; i-- > HEAP0; )
4394 cb (EV_A_ EV_PERIODIC, ANHE_w (periodics [i]));
4398 if (types & EV_IDLE)
4399 for (j = NUMPRI; j--; )
4400 for (i = idlecnt [j]; i--; )
4401 cb (EV_A_ EV_IDLE, idles [j][i]);
4405 if (types & EV_FORK)
4406 for (i = forkcnt; i--; )
4407 if (ev_cb (forks [i]) != embed_fork_cb)
4408 cb (EV_A_ EV_FORK, forks [i]);
4412 if (types & EV_ASYNC)
4413 for (i = asynccnt; i--; )
4414 cb (EV_A_ EV_ASYNC, asyncs [i]);
4417 #if EV_PREPARE_ENABLE
4418 if (types & EV_PREPARE)
4419 for (i = preparecnt; i--; )
4420 # if EV_EMBED_ENABLE
4421 if (ev_cb (prepares [i]) != embed_prepare_cb)
4423 cb (EV_A_ EV_PREPARE, prepares [i]);
4427 if (types & EV_CHECK)
4428 for (i = checkcnt; i--; )
4429 cb (EV_A_ EV_CHECK, checks [i]);
4432 #if EV_SIGNAL_ENABLE
4433 if (types & EV_SIGNAL)
4434 for (i = 0; i < EV_NSIG - 1; ++i)
4435 for (wl = signals [i].head; wl; )
4438 cb (EV_A_ EV_SIGNAL, wl);
4444 if (types & EV_CHILD)
4445 for (i = (EV_PID_HASHSIZE); i--; )
4446 for (wl = childs [i]; wl; )
4449 cb (EV_A_ EV_CHILD, wl);
4453 /* EV_STAT 0x00001000 /* stat data changed */
4454 /* EV_EMBED 0x00010000 /* embedded event loop needs sweep */
4459 #include "ev_wrap.h"