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>
191 # include <sys/time.h>
192 # include <sys/wait.h>
196 # define WIN32_LEAN_AND_MEAN
197 # include <windows.h>
198 # ifndef EV_SELECT_IS_WINSOCKET
199 # define EV_SELECT_IS_WINSOCKET 1
201 # undef EV_AVOID_STDIO
204 /* OS X, in its infinite idiocy, actually HARDCODES
205 * a limit of 1024 into their select. Where people have brains,
206 * OS X engineers apparently have a vacuum. Or maybe they were
207 * ordered to have a vacuum, or they do anything for money.
208 * This might help. Or not.
210 #define _DARWIN_UNLIMITED_SELECT 1
212 /* this block tries to deduce configuration from header-defined symbols and defaults */
214 /* try to deduce the maximum number of signals on this platform */
215 #if defined (EV_NSIG)
216 /* use what's provided */
218 # define EV_NSIG (NSIG)
220 # define EV_NSIG (_NSIG)
221 #elif defined (SIGMAX)
222 # define EV_NSIG (SIGMAX+1)
223 #elif defined (SIG_MAX)
224 # define EV_NSIG (SIG_MAX+1)
225 #elif defined (_SIG_MAX)
226 # define EV_NSIG (_SIG_MAX+1)
227 #elif defined (MAXSIG)
228 # define EV_NSIG (MAXSIG+1)
229 #elif defined (MAX_SIG)
230 # define EV_NSIG (MAX_SIG+1)
231 #elif defined (SIGARRAYSIZE)
232 # define EV_NSIG (SIGARRAYSIZE) /* Assume ary[SIGARRAYSIZE] */
233 #elif defined (_sys_nsig)
234 # define EV_NSIG (_sys_nsig) /* Solaris 2.5 */
236 # error "unable to find value for NSIG, please report"
237 /* to make it compile regardless, just remove the above line, */
238 /* but consider reporting it, too! :) */
243 # define EV_USE_FLOOR 0
246 #ifndef EV_USE_CLOCK_SYSCALL
247 # if __linux && __GLIBC__ >= 2
248 # define EV_USE_CLOCK_SYSCALL EV_FEATURE_OS
250 # define EV_USE_CLOCK_SYSCALL 0
254 #ifndef EV_USE_MONOTONIC
255 # if defined (_POSIX_MONOTONIC_CLOCK) && _POSIX_MONOTONIC_CLOCK >= 0
256 # define EV_USE_MONOTONIC EV_FEATURE_OS
258 # define EV_USE_MONOTONIC 0
262 #ifndef EV_USE_REALTIME
263 # define EV_USE_REALTIME !EV_USE_CLOCK_SYSCALL
266 #ifndef EV_USE_NANOSLEEP
267 # if _POSIX_C_SOURCE >= 199309L
268 # define EV_USE_NANOSLEEP EV_FEATURE_OS
270 # define EV_USE_NANOSLEEP 0
274 #ifndef EV_USE_SELECT
275 # define EV_USE_SELECT EV_FEATURE_BACKENDS
280 # define EV_USE_POLL 0
282 # define EV_USE_POLL EV_FEATURE_BACKENDS
287 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
288 # define EV_USE_EPOLL EV_FEATURE_BACKENDS
290 # define EV_USE_EPOLL 0
294 #ifndef EV_USE_KQUEUE
295 # define EV_USE_KQUEUE 0
299 # define EV_USE_PORT 0
302 #ifndef EV_USE_INOTIFY
303 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
304 # define EV_USE_INOTIFY EV_FEATURE_OS
306 # define EV_USE_INOTIFY 0
310 #ifndef EV_PID_HASHSIZE
311 # define EV_PID_HASHSIZE EV_FEATURE_DATA ? 16 : 1
314 #ifndef EV_INOTIFY_HASHSIZE
315 # define EV_INOTIFY_HASHSIZE EV_FEATURE_DATA ? 16 : 1
318 #ifndef EV_USE_EVENTFD
319 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
320 # define EV_USE_EVENTFD EV_FEATURE_OS
322 # define EV_USE_EVENTFD 0
326 #ifndef EV_USE_SIGNALFD
327 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
328 # define EV_USE_SIGNALFD EV_FEATURE_OS
330 # define EV_USE_SIGNALFD 0
334 #if 0 /* debugging */
336 # define EV_USE_4HEAP 1
337 # define EV_HEAP_CACHE_AT 1
341 # define EV_VERIFY (EV_FEATURE_API ? 1 : 0)
345 # define EV_USE_4HEAP EV_FEATURE_DATA
348 #ifndef EV_HEAP_CACHE_AT
349 # define EV_HEAP_CACHE_AT EV_FEATURE_DATA
352 /* on linux, we can use a (slow) syscall to avoid a dependency on pthread, */
353 /* which makes programs even slower. might work on other unices, too. */
354 #if EV_USE_CLOCK_SYSCALL
355 # include <syscall.h>
356 # ifdef SYS_clock_gettime
357 # define clock_gettime(id, ts) syscall (SYS_clock_gettime, (id), (ts))
358 # undef EV_USE_MONOTONIC
359 # define EV_USE_MONOTONIC 1
361 # undef EV_USE_CLOCK_SYSCALL
362 # define EV_USE_CLOCK_SYSCALL 0
366 /* this block fixes any misconfiguration where we know we run into trouble otherwise */
369 /* AIX has a completely broken poll.h header */
371 # define EV_USE_POLL 0
374 #ifndef CLOCK_MONOTONIC
375 # undef EV_USE_MONOTONIC
376 # define EV_USE_MONOTONIC 0
379 #ifndef CLOCK_REALTIME
380 # undef EV_USE_REALTIME
381 # define EV_USE_REALTIME 0
385 # undef EV_USE_INOTIFY
386 # define EV_USE_INOTIFY 0
389 #if !EV_USE_NANOSLEEP
390 /* hp-ux has it in sys/time.h, which we unconditionally include above */
391 # if !defined(_WIN32) && !defined(__hpux)
392 # include <sys/select.h>
397 # include <sys/statfs.h>
398 # include <sys/inotify.h>
399 /* some very old inotify.h headers don't have IN_DONT_FOLLOW */
400 # ifndef IN_DONT_FOLLOW
401 # undef EV_USE_INOTIFY
402 # define EV_USE_INOTIFY 0
406 #if EV_SELECT_IS_WINSOCKET
407 # include <winsock.h>
411 /* our minimum requirement is glibc 2.7 which has the stub, but not the header */
413 # ifndef EFD_NONBLOCK
414 # define EFD_NONBLOCK O_NONBLOCK
418 # define EFD_CLOEXEC O_CLOEXEC
420 # define EFD_CLOEXEC 02000000
423 EV_CPP(extern "C") int (eventfd) (unsigned int initval, int flags);
427 /* our minimum requirement is glibc 2.7 which has the stub, but not the header */
429 # ifndef SFD_NONBLOCK
430 # define SFD_NONBLOCK O_NONBLOCK
434 # define SFD_CLOEXEC O_CLOEXEC
436 # define SFD_CLOEXEC 02000000
439 EV_CPP (extern "C") int signalfd (int fd, const sigset_t *mask, int flags);
441 struct signalfd_siginfo
444 char pad[128 - sizeof (uint32_t)];
451 # define EV_FREQUENT_CHECK ev_verify (EV_A)
453 # define EV_FREQUENT_CHECK do { } while (0)
457 * This is used to work around floating point rounding problems.
458 * This value is good at least till the year 4000.
460 #define MIN_INTERVAL 0.0001220703125 /* 1/2**13, good till 4000 */
461 /*#define MIN_INTERVAL 0.00000095367431640625 /* 1/2**20, good till 2200 */
463 #define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
464 #define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
466 #define EV_TV_SET(tv,t) do { tv.tv_sec = (long)t; tv.tv_usec = (long)((t - tv.tv_sec) * 1e6); } while (0)
467 #define EV_TS_SET(ts,t) do { ts.tv_sec = (long)t; ts.tv_nsec = (long)((t - ts.tv_sec) * 1e9); } while (0)
469 /* the following is ecb.h embedded into libev - use update_ev_c to update from an external copy */
472 * libecb - http://software.schmorp.de/pkg/libecb
474 * Copyright (©) 2009-2011 Marc Alexander Lehmann <libecb@schmorp.de>
475 * Copyright (©) 2011 Emanuele Giaquinta
476 * All rights reserved.
478 * Redistribution and use in source and binary forms, with or without modifica-
479 * tion, are permitted provided that the following conditions are met:
481 * 1. Redistributions of source code must retain the above copyright notice,
482 * this list of conditions and the following disclaimer.
484 * 2. Redistributions in binary form must reproduce the above copyright
485 * notice, this list of conditions and the following disclaimer in the
486 * documentation and/or other materials provided with the distribution.
488 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
489 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
490 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
491 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
492 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
493 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
494 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
495 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
496 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
497 * OF THE POSSIBILITY OF SUCH DAMAGE.
504 typedef signed char int8_t;
505 typedef unsigned char uint8_t;
506 typedef signed short int16_t;
507 typedef unsigned short uint16_t;
508 typedef signed int int32_t;
509 typedef unsigned int uint32_t;
511 typedef signed long long int64_t;
512 typedef unsigned long long uint64_t;
513 #else /* _MSC_VER || __BORLANDC__ */
514 typedef signed __int64 int64_t;
515 typedef unsigned __int64 uint64_t;
518 #include <inttypes.h>
521 /* many compilers define _GNUC_ to some versions but then only implement
522 * what their idiot authors think are the "more important" extensions,
523 * causing enormous grief in return for some better fake benchmark numbers.
525 * we try to detect these and simply assume they are not gcc - if they have
526 * an issue with that they should have done it right in the first place.
528 #ifndef ECB_GCC_VERSION
529 #if !defined(__GNUC_MINOR__) || defined(__INTEL_COMPILER) || defined(__SUNPRO_C) || defined(__SUNPRO_CC) || defined(__llvm__) || defined(__clang__)
530 #define ECB_GCC_VERSION(major,minor) 0
532 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
536 /*****************************************************************************/
538 /* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
539 /* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
541 #if ECB_NO_THREADS || ECB_NO_SMP
542 #define ECB_MEMORY_FENCE do { } while (0)
543 #define ECB_MEMORY_FENCE_ACQUIRE do { } while (0)
544 #define ECB_MEMORY_FENCE_RELEASE do { } while (0)
547 #ifndef ECB_MEMORY_FENCE
548 #if ECB_GCC_VERSION(2,5)
550 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
551 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE /* non-lock xchg might be enough */
552 #define ECB_MEMORY_FENCE_RELEASE do { } while (0) /* unlikely to change in future cpus */
554 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
555 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("lfence" : : : "memory")
556 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("sfence") /* play safe - not needed in any current cpu */
557 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
558 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
559 #elif defined(__ARM_ARCH_6__ ) || defined(__ARM_ARCH_6J__ ) \
560 || defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6ZK__) \
561 || defined(__ARM_ARCH_7__ ) || defined(__ARM_ARCH_7A__ ) \
562 || defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7R__ )
563 #define ECB_MEMORY_FENCE \
566 __asm__ __volatile__ ("mcr p15,0,%0,c6,c10,5", : "=&r" (null) : : "memory"); \
572 #ifndef ECB_MEMORY_FENCE
573 #if ECB_GCC_VERSION(4,4) || defined(__INTEL_COMPILER)
574 #define ECB_MEMORY_FENCE __sync_synchronize ()
575 /*#define ECB_MEMORY_FENCE_ACQUIRE ({ char dummy = 0; __sync_lock_test_and_set (&dummy, 1); }) */
576 /*#define ECB_MEMORY_FENCE_RELEASE ({ char dummy = 1; __sync_lock_release (&dummy ); }) */
577 #elif _MSC_VER >= 1400 /* VC++ 2005 */
578 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
579 #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
580 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
581 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
582 #elif defined(_WIN32)
584 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
588 #ifndef ECB_MEMORY_FENCE
589 #if !ECB_AVOID_PTHREADS
591 * if you get undefined symbol references to pthread_mutex_lock,
592 * or failure to find pthread.h, then you should implement
593 * the ECB_MEMORY_FENCE operations for your cpu/compiler
594 * OR provide pthread.h and link against the posix thread library
598 #define ECB_NEEDS_PTHREADS 1
599 #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
601 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
602 #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
606 #if !defined(ECB_MEMORY_FENCE_ACQUIRE) && defined(ECB_MEMORY_FENCE)
607 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
610 #if !defined(ECB_MEMORY_FENCE_RELEASE) && defined(ECB_MEMORY_FENCE)
611 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
614 /*****************************************************************************/
616 #define ECB_C99 (__STDC_VERSION__ >= 199901L)
619 #define ecb_inline static inline
620 #elif ECB_GCC_VERSION(2,5)
621 #define ecb_inline static __inline__
623 #define ecb_inline static inline
625 #define ecb_inline static
628 #if ECB_GCC_VERSION(3,3)
629 #define ecb_restrict __restrict__
631 #define ecb_restrict restrict
636 typedef int ecb_bool;
638 #define ECB_CONCAT_(a, b) a ## b
639 #define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
640 #define ECB_STRINGIFY_(a) # a
641 #define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
643 #define ecb_function_ ecb_inline
645 #if ECB_GCC_VERSION(3,1)
646 #define ecb_attribute(attrlist) __attribute__(attrlist)
647 #define ecb_is_constant(expr) __builtin_constant_p (expr)
648 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
649 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
651 #define ecb_attribute(attrlist)
652 #define ecb_is_constant(expr) 0
653 #define ecb_expect(expr,value) (expr)
654 #define ecb_prefetch(addr,rw,locality)
657 /* no emulation for ecb_decltype */
658 #if ECB_GCC_VERSION(4,5)
659 #define ecb_decltype(x) __decltype(x)
660 #elif ECB_GCC_VERSION(3,0)
661 #define ecb_decltype(x) __typeof(x)
664 #define ecb_noinline ecb_attribute ((__noinline__))
665 #define ecb_noreturn ecb_attribute ((__noreturn__))
666 #define ecb_unused ecb_attribute ((__unused__))
667 #define ecb_const ecb_attribute ((__const__))
668 #define ecb_pure ecb_attribute ((__pure__))
670 #if ECB_GCC_VERSION(4,3)
671 #define ecb_artificial ecb_attribute ((__artificial__))
672 #define ecb_hot ecb_attribute ((__hot__))
673 #define ecb_cold ecb_attribute ((__cold__))
675 #define ecb_artificial
680 /* put around conditional expressions if you are very sure that the */
681 /* expression is mostly true or mostly false. note that these return */
682 /* booleans, not the expression. */
683 #define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
684 #define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
685 /* for compatibility to the rest of the world */
686 #define ecb_likely(expr) ecb_expect_true (expr)
687 #define ecb_unlikely(expr) ecb_expect_false (expr)
689 /* count trailing zero bits and count # of one bits */
690 #if ECB_GCC_VERSION(3,4)
691 /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
692 #define ecb_ld32(x) (__builtin_clz (x) ^ 31)
693 #define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
694 #define ecb_ctz32(x) __builtin_ctz (x)
695 #define ecb_ctz64(x) __builtin_ctzll (x)
696 #define ecb_popcount32(x) __builtin_popcount (x)
699 ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const;
701 ecb_ctz32 (uint32_t x)
705 x &= ~x + 1; /* this isolates the lowest bit */
707 #if ECB_branchless_on_i386
708 r += !!(x & 0xaaaaaaaa) << 0;
709 r += !!(x & 0xcccccccc) << 1;
710 r += !!(x & 0xf0f0f0f0) << 2;
711 r += !!(x & 0xff00ff00) << 3;
712 r += !!(x & 0xffff0000) << 4;
714 if (x & 0xaaaaaaaa) r += 1;
715 if (x & 0xcccccccc) r += 2;
716 if (x & 0xf0f0f0f0) r += 4;
717 if (x & 0xff00ff00) r += 8;
718 if (x & 0xffff0000) r += 16;
724 ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const;
726 ecb_ctz64 (uint64_t x)
728 int shift = x & 0xffffffffU ? 0 : 32;
729 return ecb_ctz32 (x >> shift) + shift;
732 ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const;
734 ecb_popcount32 (uint32_t x)
736 x -= (x >> 1) & 0x55555555;
737 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
738 x = ((x >> 4) + x) & 0x0f0f0f0f;
744 ecb_function_ int ecb_ld32 (uint32_t x) ecb_const;
745 ecb_function_ int ecb_ld32 (uint32_t x)
749 if (x >> 16) { x >>= 16; r += 16; }
750 if (x >> 8) { x >>= 8; r += 8; }
751 if (x >> 4) { x >>= 4; r += 4; }
752 if (x >> 2) { x >>= 2; r += 2; }
753 if (x >> 1) { r += 1; }
758 ecb_function_ int ecb_ld64 (uint64_t x) ecb_const;
759 ecb_function_ int ecb_ld64 (uint64_t x)
763 if (x >> 32) { x >>= 32; r += 32; }
765 return r + ecb_ld32 (x);
769 /* popcount64 is only available on 64 bit cpus as gcc builtin */
770 /* so for this version we are lazy */
771 ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;
773 ecb_popcount64 (uint64_t x)
775 return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
778 ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const;
779 ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const;
780 ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const;
781 ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const;
782 ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
783 ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
784 ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const;
785 ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const;
787 ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }
788 ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }
789 ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }
790 ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }
791 ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
792 ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
793 ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
794 ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }
796 #if ECB_GCC_VERSION(4,3)
797 #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
798 #define ecb_bswap32(x) __builtin_bswap32 (x)
799 #define ecb_bswap64(x) __builtin_bswap64 (x)
801 ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const;
802 ecb_function_ uint16_t
803 ecb_bswap16 (uint16_t x)
805 return ecb_rotl16 (x, 8);
808 ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const;
809 ecb_function_ uint32_t
810 ecb_bswap32 (uint32_t x)
812 return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
815 ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const;
816 ecb_function_ uint64_t
817 ecb_bswap64 (uint64_t x)
819 return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
823 #if ECB_GCC_VERSION(4,5)
824 #define ecb_unreachable() __builtin_unreachable ()
826 /* this seems to work fine, but gcc always emits a warning for it :/ */
827 ecb_function_ void ecb_unreachable (void) ecb_noreturn;
828 ecb_function_ void ecb_unreachable (void) { }
831 /* try to tell the compiler that some condition is definitely true */
832 #define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
834 ecb_function_ unsigned char ecb_byteorder_helper (void) ecb_const;
835 ecb_function_ unsigned char
836 ecb_byteorder_helper (void)
838 const uint32_t u = 0x11223344;
839 return *(unsigned char *)&u;
842 ecb_function_ ecb_bool ecb_big_endian (void) ecb_const;
843 ecb_function_ ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
844 ecb_function_ ecb_bool ecb_little_endian (void) ecb_const;
845 ecb_function_ ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
847 #if ECB_GCC_VERSION(3,0) || ECB_C99
848 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
850 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
853 #if ecb_cplusplus_does_not_suck
854 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
855 template<typename T, int N>
856 static inline int ecb_array_length (const T (&arr)[N])
861 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
868 #if ECB_MEMORY_FENCE_NEEDS_PTHREADS
869 # undef ECB_MEMORY_FENCE
870 # undef ECB_MEMORY_FENCE_ACQUIRE
871 # undef ECB_MEMORY_FENCE_RELEASE
874 #define expect_false(cond) ecb_expect_false (cond)
875 #define expect_true(cond) ecb_expect_true (cond)
876 #define noinline ecb_noinline
878 #define inline_size ecb_inline
881 # define inline_speed ecb_inline
883 # define inline_speed static noinline
886 #define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
888 #if EV_MINPRI == EV_MAXPRI
889 # define ABSPRI(w) (((W)w), 0)
891 # define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
894 #define EMPTY /* required for microsofts broken pseudo-c compiler */
895 #define EMPTY2(a,b) /* used to suppress some warnings */
897 typedef ev_watcher *W;
898 typedef ev_watcher_list *WL;
899 typedef ev_watcher_time *WT;
901 #define ev_active(w) ((W)(w))->active
902 #define ev_at(w) ((WT)(w))->at
905 /* sig_atomic_t is used to avoid per-thread variables or locking but still */
906 /* giving it a reasonably high chance of working on typical architectures */
907 static EV_ATOMIC_T have_realtime; /* did clock_gettime (CLOCK_REALTIME) work? */
911 static EV_ATOMIC_T have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
914 #ifndef EV_FD_TO_WIN32_HANDLE
915 # define EV_FD_TO_WIN32_HANDLE(fd) _get_osfhandle (fd)
917 #ifndef EV_WIN32_HANDLE_TO_FD
918 # define EV_WIN32_HANDLE_TO_FD(handle) _open_osfhandle (handle, 0)
920 #ifndef EV_WIN32_CLOSE_FD
921 # define EV_WIN32_CLOSE_FD(fd) close (fd)
925 # include "ev_win32.c"
928 /*****************************************************************************/
930 /* define a suitable floor function (only used by periodics atm) */
934 # define ev_floor(v) floor (v)
939 /* a floor() replacement function, should be independent of ev_tstamp type */
940 static ev_tstamp noinline
941 ev_floor (ev_tstamp v)
943 /* the choice of shift factor is not terribly important */
944 #if FLT_RADIX != 2 /* assume FLT_RADIX == 10 */
945 const ev_tstamp shift = sizeof (unsigned long) >= 8 ? 10000000000000000000. : 1000000000.;
947 const ev_tstamp shift = sizeof (unsigned long) >= 8 ? 18446744073709551616. : 4294967296.;
950 /* argument too large for an unsigned long? */
951 if (expect_false (v >= shift))
956 return v; /* very large number */
958 f = shift * ev_floor (v * (1. / shift));
959 return f + ev_floor (v - f);
962 /* special treatment for negative args? */
963 if (expect_false (v < 0.))
965 ev_tstamp f = -ev_floor (-v);
967 return f - (f == v ? 0 : 1);
970 /* fits into an unsigned long */
971 return (unsigned long)v;
976 /*****************************************************************************/
979 # include <sys/utsname.h>
982 static unsigned int noinline ecb_cold
983 ev_linux_version (void)
989 char *p = buf.release;
1000 if (*p >= '0' && *p <= '9')
1001 c = c * 10 + *p++ - '0';
1018 /*****************************************************************************/
1021 static void noinline ecb_cold
1022 ev_printerr (const char *msg)
1024 write (STDERR_FILENO, msg, strlen (msg));
1028 static void (*syserr_cb)(const char *msg);
1031 ev_set_syserr_cb (void (*cb)(const char *msg))
1036 static void noinline ecb_cold
1037 ev_syserr (const char *msg)
1040 msg = "(libev) system error";
1049 ev_printerr (strerror (errno));
1059 ev_realloc_emul (void *ptr, long size)
1062 return realloc (ptr, size);
1064 /* some systems, notably openbsd and darwin, fail to properly
1065 * implement realloc (x, 0) (as required by both ansi c-89 and
1066 * the single unix specification, so work around them here.
1070 return realloc (ptr, size);
1077 static void *(*alloc)(void *ptr, long size) = ev_realloc_emul;
1080 ev_set_allocator (void *(*cb)(void *ptr, long size))
1086 ev_realloc (void *ptr, long size)
1088 ptr = alloc (ptr, size);
1093 ev_printerr ("(libev) memory allocation failed, aborting.\n");
1095 fprintf (stderr, "(libev) cannot allocate %ld bytes, aborting.", size);
1103 #define ev_malloc(size) ev_realloc (0, (size))
1104 #define ev_free(ptr) ev_realloc ((ptr), 0)
1106 /*****************************************************************************/
1108 /* set in reify when reification needed */
1109 #define EV_ANFD_REIFY 1
1111 /* file descriptor info structure */
1115 unsigned char events; /* the events watched for */
1116 unsigned char reify; /* flag set when this ANFD needs reification (EV_ANFD_REIFY, EV__IOFDSET) */
1117 unsigned char emask; /* the epoll backend stores the actual kernel mask in here */
1118 unsigned char unused;
1120 unsigned int egen; /* generation counter to counter epoll bugs */
1122 #if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
1130 /* stores the pending event set for a given watcher */
1134 int events; /* the pending event set for the given watcher */
1138 /* hash table entry per inotify-id */
1146 #if EV_HEAP_CACHE_AT
1147 /* a heap element */
1153 #define ANHE_w(he) (he).w /* access watcher, read-write */
1154 #define ANHE_at(he) (he).at /* access cached at, read-only */
1155 #define ANHE_at_cache(he) (he).at = (he).w->at /* update at from watcher */
1157 /* a heap element */
1160 #define ANHE_w(he) (he)
1161 #define ANHE_at(he) (he)->at
1162 #define ANHE_at_cache(he)
1169 ev_tstamp ev_rt_now;
1170 #define ev_rt_now ((loop)->ev_rt_now)
1171 #define VAR(name,decl) decl;
1172 #include "ev_vars.h"
1175 #include "ev_wrap.h"
1177 static struct ev_loop default_loop_struct;
1178 struct ev_loop *ev_default_loop_ptr;
1182 ev_tstamp ev_rt_now;
1183 #define VAR(name,decl) static decl;
1184 #include "ev_vars.h"
1187 static int ev_default_loop_ptr;
1192 # define EV_RELEASE_CB if (expect_false (release_cb)) release_cb (EV_A)
1193 # define EV_ACQUIRE_CB if (expect_false (acquire_cb)) acquire_cb (EV_A)
1194 # define EV_INVOKE_PENDING invoke_cb (EV_A)
1196 # define EV_RELEASE_CB (void)0
1197 # define EV_ACQUIRE_CB (void)0
1198 # define EV_INVOKE_PENDING ev_invoke_pending (EV_A)
1201 #define EVBREAK_RECURSE 0x80
1203 /*****************************************************************************/
1205 #ifndef EV_HAVE_EV_TIME
1210 if (expect_true (have_realtime))
1213 clock_gettime (CLOCK_REALTIME, &ts);
1214 return ts.tv_sec + ts.tv_nsec * 1e-9;
1219 gettimeofday (&tv, 0);
1220 return tv.tv_sec + tv.tv_usec * 1e-6;
1224 inline_size ev_tstamp
1227 #if EV_USE_MONOTONIC
1228 if (expect_true (have_monotonic))
1231 clock_gettime (CLOCK_MONOTONIC, &ts);
1232 return ts.tv_sec + ts.tv_nsec * 1e-9;
1248 ev_sleep (ev_tstamp delay)
1252 #if EV_USE_NANOSLEEP
1255 EV_TS_SET (ts, delay);
1257 #elif defined(_WIN32)
1258 Sleep ((unsigned long)(delay * 1e3));
1262 /* here we rely on sys/time.h + sys/types.h + unistd.h providing select */
1263 /* something not guaranteed by newer posix versions, but guaranteed */
1265 EV_TV_SET (tv, delay);
1266 select (0, 0, 0, 0, &tv);
1271 /*****************************************************************************/
1273 #define MALLOC_ROUND 4096 /* prefer to allocate in chunks of this size, must be 2**n and >> 4 longs */
1275 /* find a suitable new size for the given array, */
1276 /* hopefully by rounding to a nice-to-malloc size */
1278 array_nextsize (int elem, int cur, int cnt)
1286 /* if size is large, round to MALLOC_ROUND - 4 * longs to accomodate malloc overhead */
1287 if (elem * ncur > MALLOC_ROUND - sizeof (void *) * 4)
1290 ncur = (ncur + elem + (MALLOC_ROUND - 1) + sizeof (void *) * 4) & ~(MALLOC_ROUND - 1);
1291 ncur = ncur - sizeof (void *) * 4;
1298 static void * noinline ecb_cold
1299 array_realloc (int elem, void *base, int *cur, int cnt)
1301 *cur = array_nextsize (elem, *cur, cnt);
1302 return ev_realloc (base, elem * *cur);
1305 #define array_init_zero(base,count) \
1306 memset ((void *)(base), 0, sizeof (*(base)) * (count))
1308 #define array_needsize(type,base,cur,cnt,init) \
1309 if (expect_false ((cnt) > (cur))) \
1311 int ecb_unused ocur_ = (cur); \
1312 (base) = (type *)array_realloc \
1313 (sizeof (type), (base), &(cur), (cnt)); \
1314 init ((base) + (ocur_), (cur) - ocur_); \
1318 #define array_slim(type,stem) \
1319 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
1321 stem ## max = array_roundsize (stem ## cnt >> 1); \
1322 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
1323 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
1327 #define array_free(stem, idx) \
1328 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0; stem ## s idx = 0
1330 /*****************************************************************************/
1332 /* dummy callback for pending events */
1333 static void noinline
1334 pendingcb (EV_P_ ev_prepare *w, int revents)
1339 ev_feed_event (EV_P_ void *w, int revents)
1342 int pri = ABSPRI (w_);
1344 if (expect_false (w_->pending))
1345 pendings [pri][w_->pending - 1].events |= revents;
1348 w_->pending = ++pendingcnt [pri];
1349 array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
1350 pendings [pri][w_->pending - 1].w = w_;
1351 pendings [pri][w_->pending - 1].events = revents;
1356 feed_reverse (EV_P_ W w)
1358 array_needsize (W, rfeeds, rfeedmax, rfeedcnt + 1, EMPTY2);
1359 rfeeds [rfeedcnt++] = w;
1363 feed_reverse_done (EV_P_ int revents)
1366 ev_feed_event (EV_A_ rfeeds [--rfeedcnt], revents);
1371 queue_events (EV_P_ W *events, int eventcnt, int type)
1375 for (i = 0; i < eventcnt; ++i)
1376 ev_feed_event (EV_A_ events [i], type);
1379 /*****************************************************************************/
1382 fd_event_nocheck (EV_P_ int fd, int revents)
1384 ANFD *anfd = anfds + fd;
1387 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
1389 int ev = w->events & revents;
1392 ev_feed_event (EV_A_ (W)w, ev);
1396 /* do not submit kernel events for fds that have reify set */
1397 /* because that means they changed while we were polling for new events */
1399 fd_event (EV_P_ int fd, int revents)
1401 ANFD *anfd = anfds + fd;
1403 if (expect_true (!anfd->reify))
1404 fd_event_nocheck (EV_A_ fd, revents);
1408 ev_feed_fd_event (EV_P_ int fd, int revents)
1410 if (fd >= 0 && fd < anfdmax)
1411 fd_event_nocheck (EV_A_ fd, revents);
1414 /* make sure the external fd watch events are in-sync */
1415 /* with the kernel/libev internal state */
1421 #if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
1422 for (i = 0; i < fdchangecnt; ++i)
1424 int fd = fdchanges [i];
1425 ANFD *anfd = anfds + fd;
1427 if (anfd->reify & EV__IOFDSET && anfd->head)
1429 SOCKET handle = EV_FD_TO_WIN32_HANDLE (fd);
1431 if (handle != anfd->handle)
1435 assert (("libev: only socket fds supported in this configuration", ioctlsocket (handle, FIONREAD, &arg) == 0));
1437 /* handle changed, but fd didn't - we need to do it in two steps */
1438 backend_modify (EV_A_ fd, anfd->events, 0);
1440 anfd->handle = handle;
1446 for (i = 0; i < fdchangecnt; ++i)
1448 int fd = fdchanges [i];
1449 ANFD *anfd = anfds + fd;
1452 unsigned char o_events = anfd->events;
1453 unsigned char o_reify = anfd->reify;
1457 /*if (expect_true (o_reify & EV_ANFD_REIFY)) probably a deoptimisation */
1461 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
1462 anfd->events |= (unsigned char)w->events;
1464 if (o_events != anfd->events)
1465 o_reify = EV__IOFDSET; /* actually |= */
1468 if (o_reify & EV__IOFDSET)
1469 backend_modify (EV_A_ fd, o_events, anfd->events);
1475 /* something about the given fd changed */
1477 fd_change (EV_P_ int fd, int flags)
1479 unsigned char reify = anfds [fd].reify;
1480 anfds [fd].reify |= flags;
1482 if (expect_true (!reify))
1485 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
1486 fdchanges [fdchangecnt - 1] = fd;
1490 /* the given fd is invalid/unusable, so make sure it doesn't hurt us anymore */
1491 inline_speed void ecb_cold
1492 fd_kill (EV_P_ int fd)
1496 while ((w = (ev_io *)anfds [fd].head))
1498 ev_io_stop (EV_A_ w);
1499 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
1503 /* check whether the given fd is actually valid, for error recovery */
1504 inline_size int ecb_cold
1508 return EV_FD_TO_WIN32_HANDLE (fd) != -1;
1510 return fcntl (fd, F_GETFD) != -1;
1514 /* called on EBADF to verify fds */
1515 static void noinline ecb_cold
1520 for (fd = 0; fd < anfdmax; ++fd)
1521 if (anfds [fd].events)
1522 if (!fd_valid (fd) && errno == EBADF)
1526 /* called on ENOMEM in select/poll to kill some fds and retry */
1527 static void noinline ecb_cold
1532 for (fd = anfdmax; fd--; )
1533 if (anfds [fd].events)
1540 /* usually called after fork if backend needs to re-arm all fds from scratch */
1541 static void noinline
1546 for (fd = 0; fd < anfdmax; ++fd)
1547 if (anfds [fd].events)
1549 anfds [fd].events = 0;
1550 anfds [fd].emask = 0;
1551 fd_change (EV_A_ fd, EV__IOFDSET | EV_ANFD_REIFY);
1555 /* used to prepare libev internal fd's */
1556 /* this is not fork-safe */
1561 unsigned long arg = 1;
1562 ioctlsocket (EV_FD_TO_WIN32_HANDLE (fd), FIONBIO, &arg);
1564 fcntl (fd, F_SETFD, FD_CLOEXEC);
1565 fcntl (fd, F_SETFL, O_NONBLOCK);
1569 /*****************************************************************************/
1572 * the heap functions want a real array index. array index 0 is guaranteed to not
1573 * be in-use at any time. the first heap entry is at array [HEAP0]. DHEAP gives
1574 * the branching factor of the d-tree.
1578 * at the moment we allow libev the luxury of two heaps,
1579 * a small-code-size 2-heap one and a ~1.5kb larger 4-heap
1580 * which is more cache-efficient.
1581 * the difference is about 5% with 50000+ watchers.
1586 #define HEAP0 (DHEAP - 1) /* index of first element in heap */
1587 #define HPARENT(k) ((((k) - HEAP0 - 1) / DHEAP) + HEAP0)
1588 #define UPHEAP_DONE(p,k) ((p) == (k))
1590 /* away from the root */
1592 downheap (ANHE *heap, int N, int k)
1595 ANHE *E = heap + N + HEAP0;
1601 ANHE *pos = heap + DHEAP * (k - HEAP0) + HEAP0 + 1;
1603 /* find minimum child */
1604 if (expect_true (pos + DHEAP - 1 < E))
1606 /* fast path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1607 if ( ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1608 if ( ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1609 if ( ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1613 /* slow path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1614 if (pos + 1 < E && ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1615 if (pos + 2 < E && ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1616 if (pos + 3 < E && ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1621 if (ANHE_at (he) <= minat)
1625 ev_active (ANHE_w (*minpos)) = k;
1631 ev_active (ANHE_w (he)) = k;
1637 #define HPARENT(k) ((k) >> 1)
1638 #define UPHEAP_DONE(p,k) (!(p))
1640 /* away from the root */
1642 downheap (ANHE *heap, int N, int k)
1653 c += c + 1 < N + HEAP0 && ANHE_at (heap [c]) > ANHE_at (heap [c + 1])
1656 if (ANHE_at (he) <= ANHE_at (heap [c]))
1659 heap [k] = heap [c];
1660 ev_active (ANHE_w (heap [k])) = k;
1666 ev_active (ANHE_w (he)) = k;
1670 /* towards the root */
1672 upheap (ANHE *heap, int k)
1678 int p = HPARENT (k);
1680 if (UPHEAP_DONE (p, k) || ANHE_at (heap [p]) <= ANHE_at (he))
1683 heap [k] = heap [p];
1684 ev_active (ANHE_w (heap [k])) = k;
1689 ev_active (ANHE_w (he)) = k;
1692 /* move an element suitably so it is in a correct place */
1694 adjustheap (ANHE *heap, int N, int k)
1696 if (k > HEAP0 && ANHE_at (heap [k]) <= ANHE_at (heap [HPARENT (k)]))
1699 downheap (heap, N, k);
1702 /* rebuild the heap: this function is used only once and executed rarely */
1704 reheap (ANHE *heap, int N)
1708 /* we don't use floyds algorithm, upheap is simpler and is more cache-efficient */
1709 /* also, this is easy to implement and correct for both 2-heaps and 4-heaps */
1710 for (i = 0; i < N; ++i)
1711 upheap (heap, i + HEAP0);
1714 /*****************************************************************************/
1716 /* associate signal watchers to a signal signal */
1719 EV_ATOMIC_T pending;
1726 static ANSIG signals [EV_NSIG - 1];
1728 /*****************************************************************************/
1730 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
1732 static void noinline ecb_cold
1735 if (!ev_is_active (&pipe_w))
1738 evfd = eventfd (0, EFD_NONBLOCK | EFD_CLOEXEC);
1739 if (evfd < 0 && errno == EINVAL)
1740 evfd = eventfd (0, 0);
1745 fd_intern (evfd); /* doing it twice doesn't hurt */
1746 ev_io_set (&pipe_w, evfd, EV_READ);
1751 while (pipe (evpipe))
1752 ev_syserr ("(libev) error creating signal/async pipe");
1754 fd_intern (evpipe [0]);
1755 fd_intern (evpipe [1]);
1756 ev_io_set (&pipe_w, evpipe [0], EV_READ);
1759 ev_io_start (EV_A_ &pipe_w);
1760 ev_unref (EV_A); /* watcher should not keep loop alive */
1765 evpipe_write (EV_P_ EV_ATOMIC_T *flag)
1767 if (expect_true (*flag))
1772 ECB_MEMORY_FENCE_RELEASE; /* make sure flag is visible before the wakeup */
1774 pipe_write_skipped = 1;
1776 ECB_MEMORY_FENCE; /* make sure pipe_write_skipped is visible before we check pipe_write_wanted */
1778 if (pipe_write_wanted)
1782 pipe_write_skipped = 0; /* just an optimisation, no fence needed */
1784 old_errno = errno; /* save errno because write will clobber it */
1789 uint64_t counter = 1;
1790 write (evfd, &counter, sizeof (uint64_t));
1795 /* win32 people keep sending patches that change this write() to send() */
1796 /* and then run away. but send() is wrong, it wants a socket handle on win32 */
1797 /* so when you think this write should be a send instead, please find out */
1798 /* where your send() is from - it's definitely not the microsoft send, and */
1799 /* tell me. thank you. */
1800 write (evpipe [1], &(evpipe [1]), 1);
1807 /* called whenever the libev signal pipe */
1808 /* got some events (signal, async) */
1810 pipecb (EV_P_ ev_io *iow, int revents)
1814 if (revents & EV_READ)
1820 read (evfd, &counter, sizeof (uint64_t));
1826 /* see discussion in evpipe_write when you think this read should be recv in win32 */
1827 read (evpipe [0], &dummy, 1);
1831 pipe_write_skipped = 0;
1833 #if EV_SIGNAL_ENABLE
1838 for (i = EV_NSIG - 1; i--; )
1839 if (expect_false (signals [i].pending))
1840 ev_feed_signal_event (EV_A_ i + 1);
1849 for (i = asynccnt; i--; )
1850 if (asyncs [i]->sent)
1852 asyncs [i]->sent = 0;
1853 ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
1859 /*****************************************************************************/
1862 ev_feed_signal (int signum)
1865 EV_P = signals [signum - 1].loop;
1871 if (!ev_active (&pipe_w))
1874 signals [signum - 1].pending = 1;
1875 evpipe_write (EV_A_ &sig_pending);
1879 ev_sighandler (int signum)
1882 signal (signum, ev_sighandler);
1885 ev_feed_signal (signum);
1889 ev_feed_signal_event (EV_P_ int signum)
1893 if (expect_false (signum <= 0 || signum > EV_NSIG))
1899 /* it is permissible to try to feed a signal to the wrong loop */
1900 /* or, likely more useful, feeding a signal nobody is waiting for */
1902 if (expect_false (signals [signum].loop != EV_A))
1906 signals [signum].pending = 0;
1908 for (w = signals [signum].head; w; w = w->next)
1909 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
1914 sigfdcb (EV_P_ ev_io *iow, int revents)
1916 struct signalfd_siginfo si[2], *sip; /* these structs are big */
1920 ssize_t res = read (sigfd, si, sizeof (si));
1922 /* not ISO-C, as res might be -1, but works with SuS */
1923 for (sip = si; (char *)sip < (char *)si + res; ++sip)
1924 ev_feed_signal_event (EV_A_ sip->ssi_signo);
1926 if (res < (ssize_t)sizeof (si))
1934 /*****************************************************************************/
1937 static WL childs [EV_PID_HASHSIZE];
1939 static ev_signal childev;
1941 #ifndef WIFCONTINUED
1942 # define WIFCONTINUED(status) 0
1945 /* handle a single child status event */
1947 child_reap (EV_P_ int chain, int pid, int status)
1950 int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
1952 for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next)
1954 if ((w->pid == pid || !w->pid)
1955 && (!traced || (w->flags & 1)))
1957 ev_set_priority (w, EV_MAXPRI); /* need to do it *now*, this *must* be the same prio as the signal watcher itself */
1959 w->rstatus = status;
1960 ev_feed_event (EV_A_ (W)w, EV_CHILD);
1966 # define WCONTINUED 0
1969 /* called on sigchld etc., calls waitpid */
1971 childcb (EV_P_ ev_signal *sw, int revents)
1975 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
1976 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
1979 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
1982 /* make sure we are called again until all children have been reaped */
1983 /* we need to do it this way so that the callback gets called before we continue */
1984 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
1986 child_reap (EV_A_ pid, pid, status);
1987 if ((EV_PID_HASHSIZE) > 1)
1988 child_reap (EV_A_ 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
1993 /*****************************************************************************/
1996 # include "ev_iocp.c"
1999 # include "ev_port.c"
2002 # include "ev_kqueue.c"
2005 # include "ev_epoll.c"
2008 # include "ev_poll.c"
2011 # include "ev_select.c"
2015 ev_version_major (void)
2017 return EV_VERSION_MAJOR;
2021 ev_version_minor (void)
2023 return EV_VERSION_MINOR;
2026 /* return true if we are running with elevated privileges and should ignore env variables */
2027 int inline_size ecb_cold
2028 enable_secure (void)
2033 return getuid () != geteuid ()
2034 || getgid () != getegid ();
2038 unsigned int ecb_cold
2039 ev_supported_backends (void)
2041 unsigned int flags = 0;
2043 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
2044 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
2045 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
2046 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
2047 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
2052 unsigned int ecb_cold
2053 ev_recommended_backends (void)
2055 unsigned int flags = ev_supported_backends ();
2058 /* kqueue is borked on everything but netbsd apparently */
2059 /* it usually doesn't work correctly on anything but sockets and pipes */
2060 flags &= ~EVBACKEND_KQUEUE;
2063 /* only select works correctly on that "unix-certified" platform */
2064 flags &= ~EVBACKEND_KQUEUE; /* horribly broken, even for sockets */
2065 flags &= ~EVBACKEND_POLL; /* poll is based on kqueue from 10.5 onwards */
2068 flags &= ~EVBACKEND_POLL; /* poll return value is unusable (http://forums.freebsd.org/archive/index.php/t-10270.html) */
2074 unsigned int ecb_cold
2075 ev_embeddable_backends (void)
2077 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
2079 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
2080 if (ev_linux_version () < 0x020620) /* disable it on linux < 2.6.32 */
2081 flags &= ~EVBACKEND_EPOLL;
2106 ev_set_io_collect_interval (EV_P_ ev_tstamp interval)
2108 io_blocktime = interval;
2112 ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval)
2114 timeout_blocktime = interval;
2118 ev_set_userdata (EV_P_ void *data)
2130 ev_set_invoke_pending_cb (EV_P_ void (*invoke_pending_cb)(EV_P))
2132 invoke_cb = invoke_pending_cb;
2136 ev_set_loop_release_cb (EV_P_ void (*release)(EV_P), void (*acquire)(EV_P))
2138 release_cb = release;
2139 acquire_cb = acquire;
2143 /* initialise a loop structure, must be zero-initialised */
2144 static void noinline ecb_cold
2145 loop_init (EV_P_ unsigned int flags)
2156 if (!clock_gettime (CLOCK_REALTIME, &ts))
2161 #if EV_USE_MONOTONIC
2162 if (!have_monotonic)
2166 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
2171 /* pid check not overridable via env */
2173 if (flags & EVFLAG_FORKCHECK)
2177 if (!(flags & EVFLAG_NOENV)
2178 && !enable_secure ()
2179 && getenv ("LIBEV_FLAGS"))
2180 flags = atoi (getenv ("LIBEV_FLAGS"));
2182 ev_rt_now = ev_time ();
2183 mn_now = get_clock ();
2185 rtmn_diff = ev_rt_now - mn_now;
2187 invoke_cb = ev_invoke_pending;
2191 timeout_blocktime = 0.;
2198 pipe_write_skipped = 0;
2199 pipe_write_wanted = 0;
2201 fs_fd = flags & EVFLAG_NOINOTIFY ? -1 : -2;
2204 sigfd = flags & EVFLAG_SIGNALFD ? -2 : -1;
2207 if (!(flags & EVBACKEND_MASK))
2208 flags |= ev_recommended_backends ();
2211 if (!backend && (flags & EVBACKEND_IOCP )) backend = iocp_init (EV_A_ flags);
2214 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
2217 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
2220 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
2223 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
2226 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
2229 ev_prepare_init (&pending_w, pendingcb);
2231 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
2232 ev_init (&pipe_w, pipecb);
2233 ev_set_priority (&pipe_w, EV_MAXPRI);
2238 /* free up a loop structure */
2240 ev_loop_destroy (EV_P)
2245 /* mimic free (0) */
2250 #if EV_CLEANUP_ENABLE
2251 /* queue cleanup watchers (and execute them) */
2252 if (expect_false (cleanupcnt))
2254 queue_events (EV_A_ (W *)cleanups, cleanupcnt, EV_CLEANUP);
2260 if (ev_is_active (&childev))
2262 ev_ref (EV_A); /* child watcher */
2263 ev_signal_stop (EV_A_ &childev);
2267 if (ev_is_active (&pipe_w))
2270 /*ev_io_stop (EV_A_ &pipe_w);*/
2277 if (evpipe [0] >= 0)
2279 EV_WIN32_CLOSE_FD (evpipe [0]);
2280 EV_WIN32_CLOSE_FD (evpipe [1]);
2285 if (ev_is_active (&sigfd_w))
2294 if (backend_fd >= 0)
2298 if (backend == EVBACKEND_IOCP ) iocp_destroy (EV_A);
2301 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
2304 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
2307 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
2310 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
2313 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
2316 for (i = NUMPRI; i--; )
2318 array_free (pending, [i]);
2320 array_free (idle, [i]);
2324 ev_free (anfds); anfds = 0; anfdmax = 0;
2326 /* have to use the microsoft-never-gets-it-right macro */
2327 array_free (rfeed, EMPTY);
2328 array_free (fdchange, EMPTY);
2329 array_free (timer, EMPTY);
2330 #if EV_PERIODIC_ENABLE
2331 array_free (periodic, EMPTY);
2334 array_free (fork, EMPTY);
2336 #if EV_CLEANUP_ENABLE
2337 array_free (cleanup, EMPTY);
2339 array_free (prepare, EMPTY);
2340 array_free (check, EMPTY);
2342 array_free (async, EMPTY);
2348 if (ev_is_default_loop (EV_A))
2350 ev_default_loop_ptr = 0;
2358 inline_size void infy_fork (EV_P);
2365 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
2368 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
2371 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
2377 if (ev_is_active (&pipe_w))
2379 /* pipe_write_wanted must be false now, so modifying fd vars should be safe */
2382 ev_io_stop (EV_A_ &pipe_w);
2389 if (evpipe [0] >= 0)
2391 EV_WIN32_CLOSE_FD (evpipe [0]);
2392 EV_WIN32_CLOSE_FD (evpipe [1]);
2395 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
2397 /* now iterate over everything, in case we missed something */
2398 pipecb (EV_A_ &pipe_w, EV_READ);
2407 struct ev_loop * ecb_cold
2408 ev_loop_new (unsigned int flags)
2410 EV_P = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
2412 memset (EV_A, 0, sizeof (struct ev_loop));
2413 loop_init (EV_A_ flags);
2415 if (ev_backend (EV_A))
2422 #endif /* multiplicity */
2425 static void noinline ecb_cold
2426 verify_watcher (EV_P_ W w)
2428 assert (("libev: watcher has invalid priority", ABSPRI (w) >= 0 && ABSPRI (w) < NUMPRI));
2431 assert (("libev: pending watcher not on pending queue", pendings [ABSPRI (w)][w->pending - 1].w == w));
2434 static void noinline ecb_cold
2435 verify_heap (EV_P_ ANHE *heap, int N)
2439 for (i = HEAP0; i < N + HEAP0; ++i)
2441 assert (("libev: active index mismatch in heap", ev_active (ANHE_w (heap [i])) == i));
2442 assert (("libev: heap condition violated", i == HEAP0 || ANHE_at (heap [HPARENT (i)]) <= ANHE_at (heap [i])));
2443 assert (("libev: heap at cache mismatch", ANHE_at (heap [i]) == ev_at (ANHE_w (heap [i]))));
2445 verify_watcher (EV_A_ (W)ANHE_w (heap [i]));
2449 static void noinline ecb_cold
2450 array_verify (EV_P_ W *ws, int cnt)
2454 assert (("libev: active index mismatch", ev_active (ws [cnt]) == cnt + 1));
2455 verify_watcher (EV_A_ ws [cnt]);
2468 assert (activecnt >= -1);
2470 assert (fdchangemax >= fdchangecnt);
2471 for (i = 0; i < fdchangecnt; ++i)
2472 assert (("libev: negative fd in fdchanges", fdchanges [i] >= 0));
2474 assert (anfdmax >= 0);
2475 for (i = 0; i < anfdmax; ++i)
2476 for (w = anfds [i].head; w; w = w->next)
2478 verify_watcher (EV_A_ (W)w);
2479 assert (("libev: inactive fd watcher on anfd list", ev_active (w) == 1));
2480 assert (("libev: fd mismatch between watcher and anfd", ((ev_io *)w)->fd == i));
2483 assert (timermax >= timercnt);
2484 verify_heap (EV_A_ timers, timercnt);
2486 #if EV_PERIODIC_ENABLE
2487 assert (periodicmax >= periodiccnt);
2488 verify_heap (EV_A_ periodics, periodiccnt);
2491 for (i = NUMPRI; i--; )
2493 assert (pendingmax [i] >= pendingcnt [i]);
2495 assert (idleall >= 0);
2496 assert (idlemax [i] >= idlecnt [i]);
2497 array_verify (EV_A_ (W *)idles [i], idlecnt [i]);
2502 assert (forkmax >= forkcnt);
2503 array_verify (EV_A_ (W *)forks, forkcnt);
2506 #if EV_CLEANUP_ENABLE
2507 assert (cleanupmax >= cleanupcnt);
2508 array_verify (EV_A_ (W *)cleanups, cleanupcnt);
2512 assert (asyncmax >= asynccnt);
2513 array_verify (EV_A_ (W *)asyncs, asynccnt);
2516 #if EV_PREPARE_ENABLE
2517 assert (preparemax >= preparecnt);
2518 array_verify (EV_A_ (W *)prepares, preparecnt);
2522 assert (checkmax >= checkcnt);
2523 array_verify (EV_A_ (W *)checks, checkcnt);
2528 for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next)
2529 for (signum = EV_NSIG; signum--; ) if (signals [signum].pending)
2537 struct ev_loop * ecb_cold
2541 ev_default_loop (unsigned int flags)
2543 if (!ev_default_loop_ptr)
2546 EV_P = ev_default_loop_ptr = &default_loop_struct;
2548 ev_default_loop_ptr = 1;
2551 loop_init (EV_A_ flags);
2553 if (ev_backend (EV_A))
2556 ev_signal_init (&childev, childcb, SIGCHLD);
2557 ev_set_priority (&childev, EV_MAXPRI);
2558 ev_signal_start (EV_A_ &childev);
2559 ev_unref (EV_A); /* child watcher should not keep loop alive */
2563 ev_default_loop_ptr = 0;
2566 return ev_default_loop_ptr;
2572 postfork = 1; /* must be in line with ev_default_fork */
2575 /*****************************************************************************/
2578 ev_invoke (EV_P_ void *w, int revents)
2580 EV_CB_INVOKE ((W)w, revents);
2584 ev_pending_count (EV_P)
2587 unsigned int count = 0;
2589 for (pri = NUMPRI; pri--; )
2590 count += pendingcnt [pri];
2596 ev_invoke_pending (EV_P)
2600 for (pri = NUMPRI; pri--; )
2601 while (pendingcnt [pri])
2603 ANPENDING *p = pendings [pri] + --pendingcnt [pri];
2606 EV_CB_INVOKE (p->w, p->events);
2612 /* make idle watchers pending. this handles the "call-idle */
2613 /* only when higher priorities are idle" logic */
2617 if (expect_false (idleall))
2621 for (pri = NUMPRI; pri--; )
2623 if (pendingcnt [pri])
2628 queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
2636 /* make timers pending */
2642 if (timercnt && ANHE_at (timers [HEAP0]) < mn_now)
2646 ev_timer *w = (ev_timer *)ANHE_w (timers [HEAP0]);
2648 /*assert (("libev: inactive timer on timer heap detected", ev_is_active (w)));*/
2650 /* first reschedule or stop timer */
2653 ev_at (w) += w->repeat;
2654 if (ev_at (w) < mn_now)
2657 assert (("libev: negative ev_timer repeat value found while processing timers", w->repeat > 0.));
2659 ANHE_at_cache (timers [HEAP0]);
2660 downheap (timers, timercnt, HEAP0);
2663 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
2666 feed_reverse (EV_A_ (W)w);
2668 while (timercnt && ANHE_at (timers [HEAP0]) < mn_now);
2670 feed_reverse_done (EV_A_ EV_TIMER);
2674 #if EV_PERIODIC_ENABLE
2676 static void noinline
2677 periodic_recalc (EV_P_ ev_periodic *w)
2679 ev_tstamp interval = w->interval > MIN_INTERVAL ? w->interval : MIN_INTERVAL;
2680 ev_tstamp at = w->offset + interval * ev_floor ((ev_rt_now - w->offset) / interval);
2682 /* the above almost always errs on the low side */
2683 while (at <= ev_rt_now)
2685 ev_tstamp nat = at + w->interval;
2687 /* when resolution fails us, we use ev_rt_now */
2688 if (expect_false (nat == at))
2700 /* make periodics pending */
2702 periodics_reify (EV_P)
2706 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now)
2712 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [HEAP0]);
2714 /*assert (("libev: inactive timer on periodic heap detected", ev_is_active (w)));*/
2716 /* first reschedule or stop timer */
2717 if (w->reschedule_cb)
2719 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2721 assert (("libev: ev_periodic reschedule callback returned time in the past", ev_at (w) >= ev_rt_now));
2723 ANHE_at_cache (periodics [HEAP0]);
2724 downheap (periodics, periodiccnt, HEAP0);
2726 else if (w->interval)
2728 periodic_recalc (EV_A_ w);
2729 ANHE_at_cache (periodics [HEAP0]);
2730 downheap (periodics, periodiccnt, HEAP0);
2733 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
2736 feed_reverse (EV_A_ (W)w);
2738 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now);
2740 feed_reverse_done (EV_A_ EV_PERIODIC);
2744 /* simply recalculate all periodics */
2745 /* TODO: maybe ensure that at least one event happens when jumping forward? */
2746 static void noinline ecb_cold
2747 periodics_reschedule (EV_P)
2751 /* adjust periodics after time jump */
2752 for (i = HEAP0; i < periodiccnt + HEAP0; ++i)
2754 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [i]);
2756 if (w->reschedule_cb)
2757 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2758 else if (w->interval)
2759 periodic_recalc (EV_A_ w);
2761 ANHE_at_cache (periodics [i]);
2764 reheap (periodics, periodiccnt);
2768 /* adjust all timers by a given offset */
2769 static void noinline ecb_cold
2770 timers_reschedule (EV_P_ ev_tstamp adjust)
2774 for (i = 0; i < timercnt; ++i)
2776 ANHE *he = timers + i + HEAP0;
2777 ANHE_w (*he)->at += adjust;
2778 ANHE_at_cache (*he);
2782 /* fetch new monotonic and realtime times from the kernel */
2783 /* also detect if there was a timejump, and act accordingly */
2785 time_update (EV_P_ ev_tstamp max_block)
2787 #if EV_USE_MONOTONIC
2788 if (expect_true (have_monotonic))
2791 ev_tstamp odiff = rtmn_diff;
2793 mn_now = get_clock ();
2795 /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
2796 /* interpolate in the meantime */
2797 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
2799 ev_rt_now = rtmn_diff + mn_now;
2804 ev_rt_now = ev_time ();
2806 /* loop a few times, before making important decisions.
2807 * on the choice of "4": one iteration isn't enough,
2808 * in case we get preempted during the calls to
2809 * ev_time and get_clock. a second call is almost guaranteed
2810 * to succeed in that case, though. and looping a few more times
2811 * doesn't hurt either as we only do this on time-jumps or
2812 * in the unlikely event of having been preempted here.
2817 rtmn_diff = ev_rt_now - mn_now;
2819 diff = odiff - rtmn_diff;
2821 if (expect_true ((diff < 0. ? -diff : diff) < MIN_TIMEJUMP))
2822 return; /* all is well */
2824 ev_rt_now = ev_time ();
2825 mn_now = get_clock ();
2829 /* no timer adjustment, as the monotonic clock doesn't jump */
2830 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
2831 # if EV_PERIODIC_ENABLE
2832 periodics_reschedule (EV_A);
2838 ev_rt_now = ev_time ();
2840 if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
2842 /* adjust timers. this is easy, as the offset is the same for all of them */
2843 timers_reschedule (EV_A_ ev_rt_now - mn_now);
2844 #if EV_PERIODIC_ENABLE
2845 periodics_reschedule (EV_A);
2854 ev_run (EV_P_ int flags)
2860 assert (("libev: ev_loop recursion during release detected", loop_done != EVBREAK_RECURSE));
2862 loop_done = EVBREAK_CANCEL;
2864 EV_INVOKE_PENDING; /* in case we recurse, ensure ordering stays nice and clean */
2873 if (expect_false (curpid)) /* penalise the forking check even more */
2874 if (expect_false (getpid () != curpid))
2882 /* we might have forked, so queue fork handlers */
2883 if (expect_false (postfork))
2886 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
2891 #if EV_PREPARE_ENABLE
2892 /* queue prepare watchers (and execute them) */
2893 if (expect_false (preparecnt))
2895 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
2900 if (expect_false (loop_done))
2903 /* we might have forked, so reify kernel state if necessary */
2904 if (expect_false (postfork))
2907 /* update fd-related kernel structures */
2910 /* calculate blocking time */
2912 ev_tstamp waittime = 0.;
2913 ev_tstamp sleeptime = 0.;
2915 /* remember old timestamp for io_blocktime calculation */
2916 ev_tstamp prev_mn_now = mn_now;
2918 /* update time to cancel out callback processing overhead */
2919 time_update (EV_A_ 1e100);
2921 /* from now on, we want a pipe-wake-up */
2922 pipe_write_wanted = 1;
2924 ECB_MEMORY_FENCE; /* make sure pipe_write_wanted is visible before we check for potential skips */
2926 if (expect_true (!(flags & EVRUN_NOWAIT || idleall || !activecnt || pipe_write_skipped)))
2928 waittime = MAX_BLOCKTIME;
2932 ev_tstamp to = ANHE_at (timers [HEAP0]) - mn_now;
2933 if (waittime > to) waittime = to;
2936 #if EV_PERIODIC_ENABLE
2939 ev_tstamp to = ANHE_at (periodics [HEAP0]) - ev_rt_now;
2940 if (waittime > to) waittime = to;
2944 /* don't let timeouts decrease the waittime below timeout_blocktime */
2945 if (expect_false (waittime < timeout_blocktime))
2946 waittime = timeout_blocktime;
2948 /* at this point, we NEED to wait, so we have to ensure */
2949 /* to pass a minimum nonzero value to the backend */
2950 if (expect_false (waittime < backend_mintime))
2951 waittime = backend_mintime;
2953 /* extra check because io_blocktime is commonly 0 */
2954 if (expect_false (io_blocktime))
2956 sleeptime = io_blocktime - (mn_now - prev_mn_now);
2958 if (sleeptime > waittime - backend_mintime)
2959 sleeptime = waittime - backend_mintime;
2961 if (expect_true (sleeptime > 0.))
2963 ev_sleep (sleeptime);
2964 waittime -= sleeptime;
2972 assert ((loop_done = EVBREAK_RECURSE, 1)); /* assert for side effect */
2973 backend_poll (EV_A_ waittime);
2974 assert ((loop_done = EVBREAK_CANCEL, 1)); /* assert for side effect */
2976 pipe_write_wanted = 0; /* just an optimsiation, no fence needed */
2978 if (pipe_write_skipped)
2980 assert (("libev: pipe_w not active, but pipe not written", ev_is_active (&pipe_w)));
2981 ev_feed_event (EV_A_ &pipe_w, EV_CUSTOM);
2985 /* update ev_rt_now, do magic */
2986 time_update (EV_A_ waittime + sleeptime);
2989 /* queue pending timers and reschedule them */
2990 timers_reify (EV_A); /* relative timers called last */
2991 #if EV_PERIODIC_ENABLE
2992 periodics_reify (EV_A); /* absolute timers called first */
2996 /* queue idle watchers unless other events are pending */
3001 /* queue check watchers, to be executed first */
3002 if (expect_false (checkcnt))
3003 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
3008 while (expect_true (
3011 && !(flags & (EVRUN_ONCE | EVRUN_NOWAIT))
3014 if (loop_done == EVBREAK_ONE)
3015 loop_done = EVBREAK_CANCEL;
3023 ev_break (EV_P_ int how)
3041 ev_now_update (EV_P)
3043 time_update (EV_A_ 1e100);
3049 ev_now_update (EV_A);
3055 ev_tstamp mn_prev = mn_now;
3057 ev_now_update (EV_A);
3058 timers_reschedule (EV_A_ mn_now - mn_prev);
3059 #if EV_PERIODIC_ENABLE
3060 /* TODO: really do this? */
3061 periodics_reschedule (EV_A);
3065 /*****************************************************************************/
3066 /* singly-linked list management, used when the expected list length is short */
3069 wlist_add (WL *head, WL elem)
3076 wlist_del (WL *head, WL elem)
3080 if (expect_true (*head == elem))
3086 head = &(*head)->next;
3090 /* internal, faster, version of ev_clear_pending */
3092 clear_pending (EV_P_ W w)
3096 pendings [ABSPRI (w)][w->pending - 1].w = (W)&pending_w;
3102 ev_clear_pending (EV_P_ void *w)
3105 int pending = w_->pending;
3107 if (expect_true (pending))
3109 ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
3110 p->w = (W)&pending_w;
3119 pri_adjust (EV_P_ W w)
3121 int pri = ev_priority (w);
3122 pri = pri < EV_MINPRI ? EV_MINPRI : pri;
3123 pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
3124 ev_set_priority (w, pri);
3128 ev_start (EV_P_ W w, int active)
3130 pri_adjust (EV_A_ w);
3142 /*****************************************************************************/
3145 ev_io_start (EV_P_ ev_io *w)
3149 if (expect_false (ev_is_active (w)))
3152 assert (("libev: ev_io_start called with negative fd", fd >= 0));
3153 assert (("libev: ev_io_start called with illegal event mask", !(w->events & ~(EV__IOFDSET | EV_READ | EV_WRITE))));
3157 ev_start (EV_A_ (W)w, 1);
3158 array_needsize (ANFD, anfds, anfdmax, fd + 1, array_init_zero);
3159 wlist_add (&anfds[fd].head, (WL)w);
3161 fd_change (EV_A_ fd, w->events & EV__IOFDSET | EV_ANFD_REIFY);
3162 w->events &= ~EV__IOFDSET;
3168 ev_io_stop (EV_P_ ev_io *w)
3170 clear_pending (EV_A_ (W)w);
3171 if (expect_false (!ev_is_active (w)))
3174 assert (("libev: ev_io_stop called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
3178 wlist_del (&anfds[w->fd].head, (WL)w);
3179 ev_stop (EV_A_ (W)w);
3181 fd_change (EV_A_ w->fd, EV_ANFD_REIFY);
3187 ev_timer_start (EV_P_ ev_timer *w)
3189 if (expect_false (ev_is_active (w)))
3192 ev_at (w) += mn_now;
3194 assert (("libev: ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
3199 ev_start (EV_A_ (W)w, timercnt + HEAP0 - 1);
3200 array_needsize (ANHE, timers, timermax, ev_active (w) + 1, EMPTY2);
3201 ANHE_w (timers [ev_active (w)]) = (WT)w;
3202 ANHE_at_cache (timers [ev_active (w)]);
3203 upheap (timers, ev_active (w));
3207 /*assert (("libev: internal timer heap corruption", timers [ev_active (w)] == (WT)w));*/
3211 ev_timer_stop (EV_P_ ev_timer *w)
3213 clear_pending (EV_A_ (W)w);
3214 if (expect_false (!ev_is_active (w)))
3220 int active = ev_active (w);
3222 assert (("libev: internal timer heap corruption", ANHE_w (timers [active]) == (WT)w));
3226 if (expect_true (active < timercnt + HEAP0))
3228 timers [active] = timers [timercnt + HEAP0];
3229 adjustheap (timers, timercnt, active);
3233 ev_at (w) -= mn_now;
3235 ev_stop (EV_A_ (W)w);
3241 ev_timer_again (EV_P_ ev_timer *w)
3245 if (ev_is_active (w))
3249 ev_at (w) = mn_now + w->repeat;
3250 ANHE_at_cache (timers [ev_active (w)]);
3251 adjustheap (timers, timercnt, ev_active (w));
3254 ev_timer_stop (EV_A_ w);
3258 ev_at (w) = w->repeat;
3259 ev_timer_start (EV_A_ w);
3266 ev_timer_remaining (EV_P_ ev_timer *w)
3268 return ev_at (w) - (ev_is_active (w) ? mn_now : 0.);
3271 #if EV_PERIODIC_ENABLE
3273 ev_periodic_start (EV_P_ ev_periodic *w)
3275 if (expect_false (ev_is_active (w)))
3278 if (w->reschedule_cb)
3279 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
3280 else if (w->interval)
3282 assert (("libev: ev_periodic_start called with negative interval value", w->interval >= 0.));
3283 periodic_recalc (EV_A_ w);
3286 ev_at (w) = w->offset;
3291 ev_start (EV_A_ (W)w, periodiccnt + HEAP0 - 1);
3292 array_needsize (ANHE, periodics, periodicmax, ev_active (w) + 1, EMPTY2);
3293 ANHE_w (periodics [ev_active (w)]) = (WT)w;
3294 ANHE_at_cache (periodics [ev_active (w)]);
3295 upheap (periodics, ev_active (w));
3299 /*assert (("libev: internal periodic heap corruption", ANHE_w (periodics [ev_active (w)]) == (WT)w));*/
3303 ev_periodic_stop (EV_P_ ev_periodic *w)
3305 clear_pending (EV_A_ (W)w);
3306 if (expect_false (!ev_is_active (w)))
3312 int active = ev_active (w);
3314 assert (("libev: internal periodic heap corruption", ANHE_w (periodics [active]) == (WT)w));
3318 if (expect_true (active < periodiccnt + HEAP0))
3320 periodics [active] = periodics [periodiccnt + HEAP0];
3321 adjustheap (periodics, periodiccnt, active);
3325 ev_stop (EV_A_ (W)w);
3331 ev_periodic_again (EV_P_ ev_periodic *w)
3333 /* TODO: use adjustheap and recalculation */
3334 ev_periodic_stop (EV_A_ w);
3335 ev_periodic_start (EV_A_ w);
3340 # define SA_RESTART 0
3343 #if EV_SIGNAL_ENABLE
3346 ev_signal_start (EV_P_ ev_signal *w)
3348 if (expect_false (ev_is_active (w)))
3351 assert (("libev: ev_signal_start called with illegal signal number", w->signum > 0 && w->signum < EV_NSIG));
3354 assert (("libev: a signal must not be attached to two different loops",
3355 !signals [w->signum - 1].loop || signals [w->signum - 1].loop == loop));
3357 signals [w->signum - 1].loop = EV_A;
3365 sigfd = signalfd (-1, &sigfd_set, SFD_NONBLOCK | SFD_CLOEXEC);
3366 if (sigfd < 0 && errno == EINVAL)
3367 sigfd = signalfd (-1, &sigfd_set, 0); /* retry without flags */
3371 fd_intern (sigfd); /* doing it twice will not hurt */
3373 sigemptyset (&sigfd_set);
3375 ev_io_init (&sigfd_w, sigfdcb, sigfd, EV_READ);
3376 ev_set_priority (&sigfd_w, EV_MAXPRI);
3377 ev_io_start (EV_A_ &sigfd_w);
3378 ev_unref (EV_A); /* signalfd watcher should not keep loop alive */
3384 /* TODO: check .head */
3385 sigaddset (&sigfd_set, w->signum);
3386 sigprocmask (SIG_BLOCK, &sigfd_set, 0);
3388 signalfd (sigfd, &sigfd_set, 0);
3392 ev_start (EV_A_ (W)w, 1);
3393 wlist_add (&signals [w->signum - 1].head, (WL)w);
3396 # if EV_USE_SIGNALFD
3397 if (sigfd < 0) /*TODO*/
3403 signal (w->signum, ev_sighandler);
3405 struct sigaction sa;
3409 sa.sa_handler = ev_sighandler;
3410 sigfillset (&sa.sa_mask);
3411 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
3412 sigaction (w->signum, &sa, 0);
3414 if (origflags & EVFLAG_NOSIGMASK)
3416 sigemptyset (&sa.sa_mask);
3417 sigaddset (&sa.sa_mask, w->signum);
3418 sigprocmask (SIG_UNBLOCK, &sa.sa_mask, 0);
3427 ev_signal_stop (EV_P_ ev_signal *w)
3429 clear_pending (EV_A_ (W)w);
3430 if (expect_false (!ev_is_active (w)))
3435 wlist_del (&signals [w->signum - 1].head, (WL)w);
3436 ev_stop (EV_A_ (W)w);
3438 if (!signals [w->signum - 1].head)
3441 signals [w->signum - 1].loop = 0; /* unattach from signal */
3449 sigaddset (&ss, w->signum);
3450 sigdelset (&sigfd_set, w->signum);
3452 signalfd (sigfd, &sigfd_set, 0);
3453 sigprocmask (SIG_UNBLOCK, &ss, 0);
3457 signal (w->signum, SIG_DFL);
3468 ev_child_start (EV_P_ ev_child *w)
3471 assert (("libev: child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
3473 if (expect_false (ev_is_active (w)))
3478 ev_start (EV_A_ (W)w, 1);
3479 wlist_add (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);
3485 ev_child_stop (EV_P_ ev_child *w)
3487 clear_pending (EV_A_ (W)w);
3488 if (expect_false (!ev_is_active (w)))
3493 wlist_del (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);
3494 ev_stop (EV_A_ (W)w);
3505 # define lstat(a,b) _stati64 (a,b)
3508 #define DEF_STAT_INTERVAL 5.0074891
3509 #define NFS_STAT_INTERVAL 30.1074891 /* for filesystems potentially failing inotify */
3510 #define MIN_STAT_INTERVAL 0.1074891
3512 static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
3516 /* the * 2 is to allow for alignment padding, which for some reason is >> 8 */
3517 # define EV_INOTIFY_BUFSIZE (sizeof (struct inotify_event) * 2 + NAME_MAX)
3519 static void noinline
3520 infy_add (EV_P_ ev_stat *w)
3522 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);
3528 /* now local changes will be tracked by inotify, but remote changes won't */
3529 /* unless the filesystem is known to be local, we therefore still poll */
3530 /* also do poll on <2.6.25, but with normal frequency */
3533 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3534 else if (!statfs (w->path, &sfs)
3535 && (sfs.f_type == 0x1373 /* devfs */
3536 || sfs.f_type == 0xEF53 /* ext2/3 */
3537 || sfs.f_type == 0x3153464a /* jfs */
3538 || sfs.f_type == 0x52654973 /* reiser3 */
3539 || sfs.f_type == 0x01021994 /* tempfs */
3540 || sfs.f_type == 0x58465342 /* xfs */))
3541 w->timer.repeat = 0.; /* filesystem is local, kernel new enough */
3543 w->timer.repeat = w->interval ? w->interval : NFS_STAT_INTERVAL; /* remote, use reduced frequency */
3547 /* can't use inotify, continue to stat */
3548 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3550 /* if path is not there, monitor some parent directory for speedup hints */
3551 /* note that exceeding the hardcoded path limit is not a correctness issue, */
3552 /* but an efficiency issue only */
3553 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
3556 strcpy (path, w->path);
3560 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
3561 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
3563 char *pend = strrchr (path, '/');
3565 if (!pend || pend == path)
3569 w->wd = inotify_add_watch (fs_fd, path, mask);
3571 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
3576 wlist_add (&fs_hash [w->wd & ((EV_INOTIFY_HASHSIZE) - 1)].head, (WL)w);
3578 /* now re-arm timer, if required */
3579 if (ev_is_active (&w->timer)) ev_ref (EV_A);
3580 ev_timer_again (EV_A_ &w->timer);
3581 if (ev_is_active (&w->timer)) ev_unref (EV_A);
3584 static void noinline
3585 infy_del (EV_P_ ev_stat *w)
3594 slot = wd & ((EV_INOTIFY_HASHSIZE) - 1);
3595 wlist_del (&fs_hash [slot].head, (WL)w);
3597 /* remove this watcher, if others are watching it, they will rearm */
3598 inotify_rm_watch (fs_fd, wd);
3601 static void noinline
3602 infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
3605 /* overflow, need to check for all hash slots */
3606 for (slot = 0; slot < (EV_INOTIFY_HASHSIZE); ++slot)
3607 infy_wd (EV_A_ slot, wd, ev);
3612 for (w_ = fs_hash [slot & ((EV_INOTIFY_HASHSIZE) - 1)].head; w_; )
3614 ev_stat *w = (ev_stat *)w_;
3615 w_ = w_->next; /* lets us remove this watcher and all before it */
3617 if (w->wd == wd || wd == -1)
3619 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
3621 wlist_del (&fs_hash [slot & ((EV_INOTIFY_HASHSIZE) - 1)].head, (WL)w);
3623 infy_add (EV_A_ w); /* re-add, no matter what */
3626 stat_timer_cb (EV_A_ &w->timer, 0);
3633 infy_cb (EV_P_ ev_io *w, int revents)
3635 char buf [EV_INOTIFY_BUFSIZE];
3637 int len = read (fs_fd, buf, sizeof (buf));
3639 for (ofs = 0; ofs < len; )
3641 struct inotify_event *ev = (struct inotify_event *)(buf + ofs);
3642 infy_wd (EV_A_ ev->wd, ev->wd, ev);
3643 ofs += sizeof (struct inotify_event) + ev->len;
3647 inline_size void ecb_cold
3648 ev_check_2625 (EV_P)
3650 /* kernels < 2.6.25 are borked
3651 * http://www.ussg.indiana.edu/hypermail/linux/kernel/0711.3/1208.html
3653 if (ev_linux_version () < 0x020619)
3662 #if defined (IN_CLOEXEC) && defined (IN_NONBLOCK)
3663 int fd = inotify_init1 (IN_CLOEXEC | IN_NONBLOCK);
3667 return inotify_init ();
3678 ev_check_2625 (EV_A);
3680 fs_fd = infy_newfd ();
3685 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
3686 ev_set_priority (&fs_w, EV_MAXPRI);
3687 ev_io_start (EV_A_ &fs_w);
3701 ev_io_stop (EV_A_ &fs_w);
3703 fs_fd = infy_newfd ();
3708 ev_io_set (&fs_w, fs_fd, EV_READ);
3709 ev_io_start (EV_A_ &fs_w);
3713 for (slot = 0; slot < (EV_INOTIFY_HASHSIZE); ++slot)
3715 WL w_ = fs_hash [slot].head;
3716 fs_hash [slot].head = 0;
3720 ev_stat *w = (ev_stat *)w_;
3721 w_ = w_->next; /* lets us add this watcher */
3726 infy_add (EV_A_ w); /* re-add, no matter what */
3729 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3730 if (ev_is_active (&w->timer)) ev_ref (EV_A);
3731 ev_timer_again (EV_A_ &w->timer);
3732 if (ev_is_active (&w->timer)) ev_unref (EV_A);
3741 # define EV_LSTAT(p,b) _stati64 (p, b)
3743 # define EV_LSTAT(p,b) lstat (p, b)
3747 ev_stat_stat (EV_P_ ev_stat *w)
3749 if (lstat (w->path, &w->attr) < 0)
3750 w->attr.st_nlink = 0;
3751 else if (!w->attr.st_nlink)
3752 w->attr.st_nlink = 1;
3755 static void noinline
3756 stat_timer_cb (EV_P_ ev_timer *w_, int revents)
3758 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
3760 ev_statdata prev = w->attr;
3761 ev_stat_stat (EV_A_ w);
3763 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
3765 prev.st_dev != w->attr.st_dev
3766 || prev.st_ino != w->attr.st_ino
3767 || prev.st_mode != w->attr.st_mode
3768 || prev.st_nlink != w->attr.st_nlink
3769 || prev.st_uid != w->attr.st_uid
3770 || prev.st_gid != w->attr.st_gid
3771 || prev.st_rdev != w->attr.st_rdev
3772 || prev.st_size != w->attr.st_size
3773 || prev.st_atime != w->attr.st_atime
3774 || prev.st_mtime != w->attr.st_mtime
3775 || prev.st_ctime != w->attr.st_ctime
3777 /* we only update w->prev on actual differences */
3778 /* in case we test more often than invoke the callback, */
3779 /* to ensure that prev is always different to attr */
3787 ev_stat_stat (EV_A_ w); /* avoid race... */
3791 ev_feed_event (EV_A_ w, EV_STAT);
3796 ev_stat_start (EV_P_ ev_stat *w)
3798 if (expect_false (ev_is_active (w)))
3801 ev_stat_stat (EV_A_ w);
3803 if (w->interval < MIN_STAT_INTERVAL && w->interval)
3804 w->interval = MIN_STAT_INTERVAL;
3806 ev_timer_init (&w->timer, stat_timer_cb, 0., w->interval ? w->interval : DEF_STAT_INTERVAL);
3807 ev_set_priority (&w->timer, ev_priority (w));
3817 ev_timer_again (EV_A_ &w->timer);
3821 ev_start (EV_A_ (W)w, 1);
3827 ev_stat_stop (EV_P_ ev_stat *w)
3829 clear_pending (EV_A_ (W)w);
3830 if (expect_false (!ev_is_active (w)))
3839 if (ev_is_active (&w->timer))
3842 ev_timer_stop (EV_A_ &w->timer);
3845 ev_stop (EV_A_ (W)w);
3853 ev_idle_start (EV_P_ ev_idle *w)
3855 if (expect_false (ev_is_active (w)))
3858 pri_adjust (EV_A_ (W)w);
3863 int active = ++idlecnt [ABSPRI (w)];
3866 ev_start (EV_A_ (W)w, active);
3868 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
3869 idles [ABSPRI (w)][active - 1] = w;
3876 ev_idle_stop (EV_P_ ev_idle *w)
3878 clear_pending (EV_A_ (W)w);
3879 if (expect_false (!ev_is_active (w)))
3885 int active = ev_active (w);
3887 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
3888 ev_active (idles [ABSPRI (w)][active - 1]) = active;
3890 ev_stop (EV_A_ (W)w);
3898 #if EV_PREPARE_ENABLE
3900 ev_prepare_start (EV_P_ ev_prepare *w)
3902 if (expect_false (ev_is_active (w)))
3907 ev_start (EV_A_ (W)w, ++preparecnt);
3908 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
3909 prepares [preparecnt - 1] = w;
3915 ev_prepare_stop (EV_P_ ev_prepare *w)
3917 clear_pending (EV_A_ (W)w);
3918 if (expect_false (!ev_is_active (w)))
3924 int active = ev_active (w);
3926 prepares [active - 1] = prepares [--preparecnt];
3927 ev_active (prepares [active - 1]) = active;
3930 ev_stop (EV_A_ (W)w);
3938 ev_check_start (EV_P_ ev_check *w)
3940 if (expect_false (ev_is_active (w)))
3945 ev_start (EV_A_ (W)w, ++checkcnt);
3946 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
3947 checks [checkcnt - 1] = w;
3953 ev_check_stop (EV_P_ ev_check *w)
3955 clear_pending (EV_A_ (W)w);
3956 if (expect_false (!ev_is_active (w)))
3962 int active = ev_active (w);
3964 checks [active - 1] = checks [--checkcnt];
3965 ev_active (checks [active - 1]) = active;
3968 ev_stop (EV_A_ (W)w);
3976 ev_embed_sweep (EV_P_ ev_embed *w)
3978 ev_run (w->other, EVRUN_NOWAIT);
3982 embed_io_cb (EV_P_ ev_io *io, int revents)
3984 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
3987 ev_feed_event (EV_A_ (W)w, EV_EMBED);
3989 ev_run (w->other, EVRUN_NOWAIT);
3993 embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
3995 ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
4003 ev_run (EV_A_ EVRUN_NOWAIT);
4009 embed_fork_cb (EV_P_ ev_fork *fork_w, int revents)
4011 ev_embed *w = (ev_embed *)(((char *)fork_w) - offsetof (ev_embed, fork));
4013 ev_embed_stop (EV_A_ w);
4018 ev_loop_fork (EV_A);
4019 ev_run (EV_A_ EVRUN_NOWAIT);
4022 ev_embed_start (EV_A_ w);
4027 embed_idle_cb (EV_P_ ev_idle *idle, int revents)
4029 ev_idle_stop (EV_A_ idle);
4034 ev_embed_start (EV_P_ ev_embed *w)
4036 if (expect_false (ev_is_active (w)))
4041 assert (("libev: loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
4042 ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
4047 ev_set_priority (&w->io, ev_priority (w));
4048 ev_io_start (EV_A_ &w->io);
4050 ev_prepare_init (&w->prepare, embed_prepare_cb);
4051 ev_set_priority (&w->prepare, EV_MINPRI);
4052 ev_prepare_start (EV_A_ &w->prepare);
4054 ev_fork_init (&w->fork, embed_fork_cb);
4055 ev_fork_start (EV_A_ &w->fork);
4057 /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
4059 ev_start (EV_A_ (W)w, 1);
4065 ev_embed_stop (EV_P_ ev_embed *w)
4067 clear_pending (EV_A_ (W)w);
4068 if (expect_false (!ev_is_active (w)))
4073 ev_io_stop (EV_A_ &w->io);
4074 ev_prepare_stop (EV_A_ &w->prepare);
4075 ev_fork_stop (EV_A_ &w->fork);
4077 ev_stop (EV_A_ (W)w);
4085 ev_fork_start (EV_P_ ev_fork *w)
4087 if (expect_false (ev_is_active (w)))
4092 ev_start (EV_A_ (W)w, ++forkcnt);
4093 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
4094 forks [forkcnt - 1] = w;
4100 ev_fork_stop (EV_P_ ev_fork *w)
4102 clear_pending (EV_A_ (W)w);
4103 if (expect_false (!ev_is_active (w)))
4109 int active = ev_active (w);
4111 forks [active - 1] = forks [--forkcnt];
4112 ev_active (forks [active - 1]) = active;
4115 ev_stop (EV_A_ (W)w);
4121 #if EV_CLEANUP_ENABLE
4123 ev_cleanup_start (EV_P_ ev_cleanup *w)
4125 if (expect_false (ev_is_active (w)))
4130 ev_start (EV_A_ (W)w, ++cleanupcnt);
4131 array_needsize (ev_cleanup *, cleanups, cleanupmax, cleanupcnt, EMPTY2);
4132 cleanups [cleanupcnt - 1] = w;
4134 /* cleanup watchers should never keep a refcount on the loop */
4140 ev_cleanup_stop (EV_P_ ev_cleanup *w)
4142 clear_pending (EV_A_ (W)w);
4143 if (expect_false (!ev_is_active (w)))
4150 int active = ev_active (w);
4152 cleanups [active - 1] = cleanups [--cleanupcnt];
4153 ev_active (cleanups [active - 1]) = active;
4156 ev_stop (EV_A_ (W)w);
4164 ev_async_start (EV_P_ ev_async *w)
4166 if (expect_false (ev_is_active (w)))
4175 ev_start (EV_A_ (W)w, ++asynccnt);
4176 array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
4177 asyncs [asynccnt - 1] = w;
4183 ev_async_stop (EV_P_ ev_async *w)
4185 clear_pending (EV_A_ (W)w);
4186 if (expect_false (!ev_is_active (w)))
4192 int active = ev_active (w);
4194 asyncs [active - 1] = asyncs [--asynccnt];
4195 ev_active (asyncs [active - 1]) = active;
4198 ev_stop (EV_A_ (W)w);
4204 ev_async_send (EV_P_ ev_async *w)
4207 evpipe_write (EV_A_ &async_pending);
4211 /*****************************************************************************/
4217 void (*cb)(int revents, void *arg);
4222 once_cb (EV_P_ struct ev_once *once, int revents)
4224 void (*cb)(int revents, void *arg) = once->cb;
4225 void *arg = once->arg;
4227 ev_io_stop (EV_A_ &once->io);
4228 ev_timer_stop (EV_A_ &once->to);
4235 once_cb_io (EV_P_ ev_io *w, int revents)
4237 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io));
4239 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->to));
4243 once_cb_to (EV_P_ ev_timer *w, int revents)
4245 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to));
4247 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->io));
4251 ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
4253 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
4255 if (expect_false (!once))
4257 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMER, arg);
4264 ev_init (&once->io, once_cb_io);
4267 ev_io_set (&once->io, fd, events);
4268 ev_io_start (EV_A_ &once->io);
4271 ev_init (&once->to, once_cb_to);
4274 ev_timer_set (&once->to, timeout, 0.);
4275 ev_timer_start (EV_A_ &once->to);
4279 /*****************************************************************************/
4283 ev_walk (EV_P_ int types, void (*cb)(EV_P_ int type, void *w))
4286 ev_watcher_list *wl, *wn;
4288 if (types & (EV_IO | EV_EMBED))
4289 for (i = 0; i < anfdmax; ++i)
4290 for (wl = anfds [i].head; wl; )
4295 if (ev_cb ((ev_io *)wl) == embed_io_cb)
4297 if (types & EV_EMBED)
4298 cb (EV_A_ EV_EMBED, ((char *)wl) - offsetof (struct ev_embed, io));
4303 if (ev_cb ((ev_io *)wl) == infy_cb)
4307 if ((ev_io *)wl != &pipe_w)
4309 cb (EV_A_ EV_IO, wl);
4314 if (types & (EV_TIMER | EV_STAT))
4315 for (i = timercnt + HEAP0; i-- > HEAP0; )
4317 /*TODO: timer is not always active*/
4318 if (ev_cb ((ev_timer *)ANHE_w (timers [i])) == stat_timer_cb)
4320 if (types & EV_STAT)
4321 cb (EV_A_ EV_STAT, ((char *)ANHE_w (timers [i])) - offsetof (struct ev_stat, timer));
4325 if (types & EV_TIMER)
4326 cb (EV_A_ EV_TIMER, ANHE_w (timers [i]));
4328 #if EV_PERIODIC_ENABLE
4329 if (types & EV_PERIODIC)
4330 for (i = periodiccnt + HEAP0; i-- > HEAP0; )
4331 cb (EV_A_ EV_PERIODIC, ANHE_w (periodics [i]));
4335 if (types & EV_IDLE)
4336 for (j = NUMPRI; j--; )
4337 for (i = idlecnt [j]; i--; )
4338 cb (EV_A_ EV_IDLE, idles [j][i]);
4342 if (types & EV_FORK)
4343 for (i = forkcnt; i--; )
4344 if (ev_cb (forks [i]) != embed_fork_cb)
4345 cb (EV_A_ EV_FORK, forks [i]);
4349 if (types & EV_ASYNC)
4350 for (i = asynccnt; i--; )
4351 cb (EV_A_ EV_ASYNC, asyncs [i]);
4354 #if EV_PREPARE_ENABLE
4355 if (types & EV_PREPARE)
4356 for (i = preparecnt; i--; )
4357 # if EV_EMBED_ENABLE
4358 if (ev_cb (prepares [i]) != embed_prepare_cb)
4360 cb (EV_A_ EV_PREPARE, prepares [i]);
4364 if (types & EV_CHECK)
4365 for (i = checkcnt; i--; )
4366 cb (EV_A_ EV_CHECK, checks [i]);
4369 #if EV_SIGNAL_ENABLE
4370 if (types & EV_SIGNAL)
4371 for (i = 0; i < EV_NSIG - 1; ++i)
4372 for (wl = signals [i].head; wl; )
4375 cb (EV_A_ EV_SIGNAL, wl);
4381 if (types & EV_CHILD)
4382 for (i = (EV_PID_HASHSIZE); i--; )
4383 for (wl = childs [i]; wl; )
4386 cb (EV_A_ EV_CHILD, wl);
4390 /* EV_STAT 0x00001000 /* stat data changed */
4391 /* EV_EMBED 0x00010000 /* embedded event loop needs sweep */
4396 #include "ev_wrap.h"