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
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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 */
48 # if HAVE_CLOCK_SYSCALL
49 # ifndef EV_USE_CLOCK_SYSCALL
50 # define EV_USE_CLOCK_SYSCALL 1
51 # ifndef EV_USE_REALTIME
52 # define EV_USE_REALTIME 0
54 # ifndef EV_USE_MONOTONIC
55 # define EV_USE_MONOTONIC 1
58 # elif !defined(EV_USE_CLOCK_SYSCALL)
59 # define EV_USE_CLOCK_SYSCALL 0
62 # if HAVE_CLOCK_GETTIME
63 # ifndef EV_USE_MONOTONIC
64 # define EV_USE_MONOTONIC 1
66 # ifndef EV_USE_REALTIME
67 # define EV_USE_REALTIME 0
70 # ifndef EV_USE_MONOTONIC
71 # define EV_USE_MONOTONIC 0
73 # ifndef EV_USE_REALTIME
74 # define EV_USE_REALTIME 0
79 # ifndef EV_USE_NANOSLEEP
80 # define EV_USE_NANOSLEEP EV_FEATURE_OS
83 # undef EV_USE_NANOSLEEP
84 # define EV_USE_NANOSLEEP 0
87 # if HAVE_SELECT && HAVE_SYS_SELECT_H
88 # ifndef EV_USE_SELECT
89 # define EV_USE_SELECT EV_FEATURE_BACKENDS
93 # define EV_USE_SELECT 0
96 # if HAVE_POLL && HAVE_POLL_H
98 # define EV_USE_POLL EV_FEATURE_BACKENDS
102 # define EV_USE_POLL 0
105 # if HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
106 # ifndef EV_USE_EPOLL
107 # define EV_USE_EPOLL EV_FEATURE_BACKENDS
111 # define EV_USE_EPOLL 0
114 # if HAVE_KQUEUE && HAVE_SYS_EVENT_H
115 # ifndef EV_USE_KQUEUE
116 # define EV_USE_KQUEUE EV_FEATURE_BACKENDS
119 # undef EV_USE_KQUEUE
120 # define EV_USE_KQUEUE 0
123 # if HAVE_PORT_H && HAVE_PORT_CREATE
125 # define EV_USE_PORT EV_FEATURE_BACKENDS
129 # define EV_USE_PORT 0
132 # if HAVE_INOTIFY_INIT && HAVE_SYS_INOTIFY_H
133 # ifndef EV_USE_INOTIFY
134 # define EV_USE_INOTIFY EV_FEATURE_OS
137 # undef EV_USE_INOTIFY
138 # define EV_USE_INOTIFY 0
141 # if HAVE_SIGNALFD && HAVE_SYS_SIGNALFD_H
142 # ifndef EV_USE_SIGNALFD
143 # define EV_USE_SIGNALFD EV_FEATURE_OS
146 # undef EV_USE_SIGNALFD
147 # define EV_USE_SIGNALFD 0
151 # ifndef EV_USE_EVENTFD
152 # define EV_USE_EVENTFD EV_FEATURE_OS
155 # undef EV_USE_EVENTFD
156 # define EV_USE_EVENTFD 0
171 #include <sys/types.h>
186 # include <sys/time.h>
187 # include <sys/wait.h>
191 # define WIN32_LEAN_AND_MEAN
192 # include <windows.h>
193 # ifndef EV_SELECT_IS_WINSOCKET
194 # define EV_SELECT_IS_WINSOCKET 1
196 # undef EV_AVOID_STDIO
199 /* OS X, in its infinite idiocy, actually HARDCODES
200 * a limit of 1024 into their select. Where people have brains,
201 * OS X engineers apparently have a vacuum. Or maybe they were
202 * ordered to have a vacuum, or they do anything for money.
203 * This might help. Or not.
205 #define _DARWIN_UNLIMITED_SELECT 1
207 /* this block tries to deduce configuration from header-defined symbols and defaults */
209 /* try to deduce the maximum number of signals on this platform */
210 #if defined (EV_NSIG)
211 /* use what's provided */
213 # define EV_NSIG (NSIG)
215 # define EV_NSIG (_NSIG)
216 #elif defined (SIGMAX)
217 # define EV_NSIG (SIGMAX+1)
218 #elif defined (SIG_MAX)
219 # define EV_NSIG (SIG_MAX+1)
220 #elif defined (_SIG_MAX)
221 # define EV_NSIG (_SIG_MAX+1)
222 #elif defined (MAXSIG)
223 # define EV_NSIG (MAXSIG+1)
224 #elif defined (MAX_SIG)
225 # define EV_NSIG (MAX_SIG+1)
226 #elif defined (SIGARRAYSIZE)
227 # define EV_NSIG (SIGARRAYSIZE) /* Assume ary[SIGARRAYSIZE] */
228 #elif defined (_sys_nsig)
229 # define EV_NSIG (_sys_nsig) /* Solaris 2.5 */
231 # error "unable to find value for NSIG, please report"
232 /* to make it compile regardless, just remove the above line, */
233 /* but consider reporting it, too! :) */
237 #ifndef EV_USE_CLOCK_SYSCALL
238 # if __linux && __GLIBC__ >= 2
239 # define EV_USE_CLOCK_SYSCALL EV_FEATURE_OS
241 # define EV_USE_CLOCK_SYSCALL 0
245 #ifndef EV_USE_MONOTONIC
246 # if defined (_POSIX_MONOTONIC_CLOCK) && _POSIX_MONOTONIC_CLOCK >= 0
247 # define EV_USE_MONOTONIC EV_FEATURE_OS
249 # define EV_USE_MONOTONIC 0
253 #ifndef EV_USE_REALTIME
254 # define EV_USE_REALTIME !EV_USE_CLOCK_SYSCALL
257 #ifndef EV_USE_NANOSLEEP
258 # if _POSIX_C_SOURCE >= 199309L
259 # define EV_USE_NANOSLEEP EV_FEATURE_OS
261 # define EV_USE_NANOSLEEP 0
265 #ifndef EV_USE_SELECT
266 # define EV_USE_SELECT EV_FEATURE_BACKENDS
271 # define EV_USE_POLL 0
273 # define EV_USE_POLL EV_FEATURE_BACKENDS
278 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
279 # define EV_USE_EPOLL EV_FEATURE_BACKENDS
281 # define EV_USE_EPOLL 0
285 #ifndef EV_USE_KQUEUE
286 # define EV_USE_KQUEUE 0
290 # define EV_USE_PORT 0
293 #ifndef EV_USE_INOTIFY
294 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
295 # define EV_USE_INOTIFY EV_FEATURE_OS
297 # define EV_USE_INOTIFY 0
301 #ifndef EV_PID_HASHSIZE
302 # define EV_PID_HASHSIZE EV_FEATURE_DATA ? 16 : 1
305 #ifndef EV_INOTIFY_HASHSIZE
306 # define EV_INOTIFY_HASHSIZE EV_FEATURE_DATA ? 16 : 1
309 #ifndef EV_USE_EVENTFD
310 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
311 # define EV_USE_EVENTFD EV_FEATURE_OS
313 # define EV_USE_EVENTFD 0
317 #ifndef EV_USE_SIGNALFD
318 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
319 # define EV_USE_SIGNALFD EV_FEATURE_OS
321 # define EV_USE_SIGNALFD 0
325 #if 0 /* debugging */
327 # define EV_USE_4HEAP 1
328 # define EV_HEAP_CACHE_AT 1
332 # define EV_VERIFY (EV_FEATURE_API ? 1 : 0)
336 # define EV_USE_4HEAP EV_FEATURE_DATA
339 #ifndef EV_HEAP_CACHE_AT
340 # define EV_HEAP_CACHE_AT EV_FEATURE_DATA
343 /* on linux, we can use a (slow) syscall to avoid a dependency on pthread, */
344 /* which makes programs even slower. might work on other unices, too. */
345 #if EV_USE_CLOCK_SYSCALL
346 # include <syscall.h>
347 # ifdef SYS_clock_gettime
348 # define clock_gettime(id, ts) syscall (SYS_clock_gettime, (id), (ts))
349 # undef EV_USE_MONOTONIC
350 # define EV_USE_MONOTONIC 1
352 # undef EV_USE_CLOCK_SYSCALL
353 # define EV_USE_CLOCK_SYSCALL 0
357 /* this block fixes any misconfiguration where we know we run into trouble otherwise */
360 /* AIX has a completely broken poll.h header */
362 # define EV_USE_POLL 0
365 #ifndef CLOCK_MONOTONIC
366 # undef EV_USE_MONOTONIC
367 # define EV_USE_MONOTONIC 0
370 #ifndef CLOCK_REALTIME
371 # undef EV_USE_REALTIME
372 # define EV_USE_REALTIME 0
376 # undef EV_USE_INOTIFY
377 # define EV_USE_INOTIFY 0
380 #if !EV_USE_NANOSLEEP
381 /* hp-ux has it in sys/time.h, which we unconditionally include above */
382 # if !defined(_WIN32) && !defined(__hpux)
383 # include <sys/select.h>
388 # include <sys/statfs.h>
389 # include <sys/inotify.h>
390 /* some very old inotify.h headers don't have IN_DONT_FOLLOW */
391 # ifndef IN_DONT_FOLLOW
392 # undef EV_USE_INOTIFY
393 # define EV_USE_INOTIFY 0
397 #if EV_SELECT_IS_WINSOCKET
398 # include <winsock.h>
402 /* our minimum requirement is glibc 2.7 which has the stub, but not the header */
404 # ifndef EFD_NONBLOCK
405 # define EFD_NONBLOCK O_NONBLOCK
409 # define EFD_CLOEXEC O_CLOEXEC
411 # define EFD_CLOEXEC 02000000
414 EV_CPP(extern "C") int (eventfd) (unsigned int initval, int flags);
418 /* our minimum requirement is glibc 2.7 which has the stub, but not the header */
420 # ifndef SFD_NONBLOCK
421 # define SFD_NONBLOCK O_NONBLOCK
425 # define SFD_CLOEXEC O_CLOEXEC
427 # define SFD_CLOEXEC 02000000
430 EV_CPP (extern "C") int signalfd (int fd, const sigset_t *mask, int flags);
432 struct signalfd_siginfo
435 char pad[128 - sizeof (uint32_t)];
442 # define EV_FREQUENT_CHECK ev_verify (EV_A)
444 # define EV_FREQUENT_CHECK do { } while (0)
448 * This is used to avoid floating point rounding problems.
449 * It is added to ev_rt_now when scheduling periodics
450 * to ensure progress, time-wise, even when rounding
451 * errors are against us.
452 * This value is good at least till the year 4000.
453 * Better solutions welcome.
455 #define TIME_EPSILON 0.0001220703125 /* 1/8192 */
457 #define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
458 #define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
460 #define EV_TV_SET(tv,t) do { tv.tv_sec = (long)t; tv.tv_usec = (long)((t - tv.tv_sec) * 1e6); } while (0)
461 #define EV_TS_SET(ts,t) do { ts.tv_sec = (long)t; ts.tv_nsec = (long)((t - ts.tv_sec) * 1e9); } while (0)
464 # define expect(expr,value) __builtin_expect ((expr),(value))
465 # define noinline __attribute__ ((noinline))
467 # define expect(expr,value) (expr)
469 # if __STDC_VERSION__ < 199901L && __GNUC__ < 2
474 #define expect_false(expr) expect ((expr) != 0, 0)
475 #define expect_true(expr) expect ((expr) != 0, 1)
476 #define inline_size static inline
479 # define inline_speed static inline
481 # define inline_speed static noinline
484 #define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
486 #if EV_MINPRI == EV_MAXPRI
487 # define ABSPRI(w) (((W)w), 0)
489 # define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
492 #define EMPTY /* required for microsofts broken pseudo-c compiler */
493 #define EMPTY2(a,b) /* used to suppress some warnings */
495 typedef ev_watcher *W;
496 typedef ev_watcher_list *WL;
497 typedef ev_watcher_time *WT;
499 #define ev_active(w) ((W)(w))->active
500 #define ev_at(w) ((WT)(w))->at
503 /* sig_atomic_t is used to avoid per-thread variables or locking but still */
504 /* giving it a reasonably high chance of working on typical architectures */
505 static EV_ATOMIC_T have_realtime; /* did clock_gettime (CLOCK_REALTIME) work? */
509 static EV_ATOMIC_T have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
512 #ifndef EV_FD_TO_WIN32_HANDLE
513 # define EV_FD_TO_WIN32_HANDLE(fd) _get_osfhandle (fd)
515 #ifndef EV_WIN32_HANDLE_TO_FD
516 # define EV_WIN32_HANDLE_TO_FD(handle) _open_osfhandle (handle, 0)
518 #ifndef EV_WIN32_CLOSE_FD
519 # define EV_WIN32_CLOSE_FD(fd) close (fd)
523 # include "ev_win32.c"
526 /*****************************************************************************/
529 # include <sys/utsname.h>
532 static unsigned int noinline
533 ev_linux_version (void)
539 char *p = buf.release;
550 if (*p >= '0' && *p <= '9')
551 c = c * 10 + *p++ - '0';
568 /*****************************************************************************/
572 ev_printerr (const char *msg)
574 write (STDERR_FILENO, msg, strlen (msg));
578 static void (*syserr_cb)(const char *msg);
581 ev_set_syserr_cb (void (*cb)(const char *msg))
587 ev_syserr (const char *msg)
590 msg = "(libev) system error";
599 ev_printerr (strerror (errno));
609 ev_realloc_emul (void *ptr, long size)
612 return realloc (ptr, size);
614 /* some systems, notably openbsd and darwin, fail to properly
615 * implement realloc (x, 0) (as required by both ansi c-89 and
616 * the single unix specification, so work around them here.
620 return realloc (ptr, size);
627 static void *(*alloc)(void *ptr, long size) = ev_realloc_emul;
630 ev_set_allocator (void *(*cb)(void *ptr, long size))
636 ev_realloc (void *ptr, long size)
638 ptr = alloc (ptr, size);
643 ev_printerr ("(libev) memory allocation failed, aborting.\n");
645 fprintf (stderr, "(libev) cannot allocate %ld bytes, aborting.", size);
653 #define ev_malloc(size) ev_realloc (0, (size))
654 #define ev_free(ptr) ev_realloc ((ptr), 0)
656 /*****************************************************************************/
658 /* set in reify when reification needed */
659 #define EV_ANFD_REIFY 1
661 /* file descriptor info structure */
665 unsigned char events; /* the events watched for */
666 unsigned char reify; /* flag set when this ANFD needs reification (EV_ANFD_REIFY, EV__IOFDSET) */
667 unsigned char emask; /* the epoll backend stores the actual kernel mask in here */
668 unsigned char unused;
670 unsigned int egen; /* generation counter to counter epoll bugs */
672 #if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
680 /* stores the pending event set for a given watcher */
684 int events; /* the pending event set for the given watcher */
688 /* hash table entry per inotify-id */
703 #define ANHE_w(he) (he).w /* access watcher, read-write */
704 #define ANHE_at(he) (he).at /* access cached at, read-only */
705 #define ANHE_at_cache(he) (he).at = (he).w->at /* update at from watcher */
710 #define ANHE_w(he) (he)
711 #define ANHE_at(he) (he)->at
712 #define ANHE_at_cache(he)
720 #define ev_rt_now ((loop)->ev_rt_now)
721 #define VAR(name,decl) decl;
727 static struct ev_loop default_loop_struct;
728 struct ev_loop *ev_default_loop_ptr;
733 #define VAR(name,decl) static decl;
737 static int ev_default_loop_ptr;
742 # define EV_RELEASE_CB if (expect_false (release_cb)) release_cb (EV_A)
743 # define EV_ACQUIRE_CB if (expect_false (acquire_cb)) acquire_cb (EV_A)
744 # define EV_INVOKE_PENDING invoke_cb (EV_A)
746 # define EV_RELEASE_CB (void)0
747 # define EV_ACQUIRE_CB (void)0
748 # define EV_INVOKE_PENDING ev_invoke_pending (EV_A)
751 #define EVBREAK_RECURSE 0x80
753 /*****************************************************************************/
755 #ifndef EV_HAVE_EV_TIME
760 if (expect_true (have_realtime))
763 clock_gettime (CLOCK_REALTIME, &ts);
764 return ts.tv_sec + ts.tv_nsec * 1e-9;
769 gettimeofday (&tv, 0);
770 return tv.tv_sec + tv.tv_usec * 1e-6;
774 inline_size ev_tstamp
778 if (expect_true (have_monotonic))
781 clock_gettime (CLOCK_MONOTONIC, &ts);
782 return ts.tv_sec + ts.tv_nsec * 1e-9;
798 ev_sleep (ev_tstamp delay)
805 EV_TS_SET (ts, delay);
807 #elif defined(_WIN32)
808 Sleep ((unsigned long)(delay * 1e3));
812 /* here we rely on sys/time.h + sys/types.h + unistd.h providing select */
813 /* something not guaranteed by newer posix versions, but guaranteed */
815 EV_TV_SET (tv, delay);
816 select (0, 0, 0, 0, &tv);
822 ev_timeout_to_ms (ev_tstamp timeout)
824 int ms = timeout * 1000. + .999999;
826 return expect_true (ms) ? ms : timeout < 1e-6 ? 0 : 1;
829 /*****************************************************************************/
831 #define MALLOC_ROUND 4096 /* prefer to allocate in chunks of this size, must be 2**n and >> 4 longs */
833 /* find a suitable new size for the given array, */
834 /* hopefully by rounding to a nice-to-malloc size */
836 array_nextsize (int elem, int cur, int cnt)
844 /* if size is large, round to MALLOC_ROUND - 4 * longs to accomodate malloc overhead */
845 if (elem * ncur > MALLOC_ROUND - sizeof (void *) * 4)
848 ncur = (ncur + elem + (MALLOC_ROUND - 1) + sizeof (void *) * 4) & ~(MALLOC_ROUND - 1);
849 ncur = ncur - sizeof (void *) * 4;
856 static noinline void *
857 array_realloc (int elem, void *base, int *cur, int cnt)
859 *cur = array_nextsize (elem, *cur, cnt);
860 return ev_realloc (base, elem * *cur);
863 #define array_init_zero(base,count) \
864 memset ((void *)(base), 0, sizeof (*(base)) * (count))
866 #define array_needsize(type,base,cur,cnt,init) \
867 if (expect_false ((cnt) > (cur))) \
870 (base) = (type *)array_realloc \
871 (sizeof (type), (base), &(cur), (cnt)); \
872 init ((base) + (ocur_), (cur) - ocur_); \
876 #define array_slim(type,stem) \
877 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
879 stem ## max = array_roundsize (stem ## cnt >> 1); \
880 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
881 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
885 #define array_free(stem, idx) \
886 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0; stem ## s idx = 0
888 /*****************************************************************************/
890 /* dummy callback for pending events */
892 pendingcb (EV_P_ ev_prepare *w, int revents)
897 ev_feed_event (EV_P_ void *w, int revents)
900 int pri = ABSPRI (w_);
902 if (expect_false (w_->pending))
903 pendings [pri][w_->pending - 1].events |= revents;
906 w_->pending = ++pendingcnt [pri];
907 array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
908 pendings [pri][w_->pending - 1].w = w_;
909 pendings [pri][w_->pending - 1].events = revents;
914 feed_reverse (EV_P_ W w)
916 array_needsize (W, rfeeds, rfeedmax, rfeedcnt + 1, EMPTY2);
917 rfeeds [rfeedcnt++] = w;
921 feed_reverse_done (EV_P_ int revents)
924 ev_feed_event (EV_A_ rfeeds [--rfeedcnt], revents);
929 queue_events (EV_P_ W *events, int eventcnt, int type)
933 for (i = 0; i < eventcnt; ++i)
934 ev_feed_event (EV_A_ events [i], type);
937 /*****************************************************************************/
940 fd_event_nocheck (EV_P_ int fd, int revents)
942 ANFD *anfd = anfds + fd;
945 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
947 int ev = w->events & revents;
950 ev_feed_event (EV_A_ (W)w, ev);
954 /* do not submit kernel events for fds that have reify set */
955 /* because that means they changed while we were polling for new events */
957 fd_event (EV_P_ int fd, int revents)
959 ANFD *anfd = anfds + fd;
961 if (expect_true (!anfd->reify))
962 fd_event_nocheck (EV_A_ fd, revents);
966 ev_feed_fd_event (EV_P_ int fd, int revents)
968 if (fd >= 0 && fd < anfdmax)
969 fd_event_nocheck (EV_A_ fd, revents);
972 /* make sure the external fd watch events are in-sync */
973 /* with the kernel/libev internal state */
979 #if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
980 for (i = 0; i < fdchangecnt; ++i)
982 int fd = fdchanges [i];
983 ANFD *anfd = anfds + fd;
985 if (anfd->reify & EV__IOFDSET)
987 SOCKET handle = EV_FD_TO_WIN32_HANDLE (fd);
989 if (handle != anfd->handle)
993 assert (("libev: only socket fds supported in this configuration", ioctlsocket (handle, FIONREAD, &arg) == 0));
995 /* handle changed, but fd didn't - we need to do it in two steps */
996 backend_modify (EV_A_ fd, anfd->events, 0);
998 anfd->handle = handle;
1004 for (i = 0; i < fdchangecnt; ++i)
1006 int fd = fdchanges [i];
1007 ANFD *anfd = anfds + fd;
1010 unsigned char o_events = anfd->events;
1011 unsigned char o_reify = anfd->reify;
1015 /*if (expect_true (o_reify & EV_ANFD_REIFY)) probably a deoptimisation */
1019 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
1020 anfd->events |= (unsigned char)w->events;
1022 if (o_events != anfd->events)
1023 o_reify = EV__IOFDSET; /* actually |= */
1026 if (o_reify & EV__IOFDSET)
1027 backend_modify (EV_A_ fd, o_events, anfd->events);
1033 /* something about the given fd changed */
1035 fd_change (EV_P_ int fd, int flags)
1037 unsigned char reify = anfds [fd].reify;
1038 anfds [fd].reify |= flags;
1040 if (expect_true (!reify))
1043 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
1044 fdchanges [fdchangecnt - 1] = fd;
1048 /* the given fd is invalid/unusable, so make sure it doesn't hurt us anymore */
1050 fd_kill (EV_P_ int fd)
1054 while ((w = (ev_io *)anfds [fd].head))
1056 ev_io_stop (EV_A_ w);
1057 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
1061 /* check whether the given fd is actually valid, for error recovery */
1066 return EV_FD_TO_WIN32_HANDLE (fd) != -1;
1068 return fcntl (fd, F_GETFD) != -1;
1072 /* called on EBADF to verify fds */
1073 static void noinline
1078 for (fd = 0; fd < anfdmax; ++fd)
1079 if (anfds [fd].events)
1080 if (!fd_valid (fd) && errno == EBADF)
1084 /* called on ENOMEM in select/poll to kill some fds and retry */
1085 static void noinline
1090 for (fd = anfdmax; fd--; )
1091 if (anfds [fd].events)
1098 /* usually called after fork if backend needs to re-arm all fds from scratch */
1099 static void noinline
1104 for (fd = 0; fd < anfdmax; ++fd)
1105 if (anfds [fd].events)
1107 anfds [fd].events = 0;
1108 anfds [fd].emask = 0;
1109 fd_change (EV_A_ fd, EV__IOFDSET | EV_ANFD_REIFY);
1113 /* used to prepare libev internal fd's */
1114 /* this is not fork-safe */
1119 unsigned long arg = 1;
1120 ioctlsocket (EV_FD_TO_WIN32_HANDLE (fd), FIONBIO, &arg);
1122 fcntl (fd, F_SETFD, FD_CLOEXEC);
1123 fcntl (fd, F_SETFL, O_NONBLOCK);
1127 /*****************************************************************************/
1130 * the heap functions want a real array index. array index 0 is guaranteed to not
1131 * be in-use at any time. the first heap entry is at array [HEAP0]. DHEAP gives
1132 * the branching factor of the d-tree.
1136 * at the moment we allow libev the luxury of two heaps,
1137 * a small-code-size 2-heap one and a ~1.5kb larger 4-heap
1138 * which is more cache-efficient.
1139 * the difference is about 5% with 50000+ watchers.
1144 #define HEAP0 (DHEAP - 1) /* index of first element in heap */
1145 #define HPARENT(k) ((((k) - HEAP0 - 1) / DHEAP) + HEAP0)
1146 #define UPHEAP_DONE(p,k) ((p) == (k))
1148 /* away from the root */
1150 downheap (ANHE *heap, int N, int k)
1153 ANHE *E = heap + N + HEAP0;
1159 ANHE *pos = heap + DHEAP * (k - HEAP0) + HEAP0 + 1;
1161 /* find minimum child */
1162 if (expect_true (pos + DHEAP - 1 < E))
1164 /* fast path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1165 if ( ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1166 if ( ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1167 if ( ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1171 /* slow path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1172 if (pos + 1 < E && ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1173 if (pos + 2 < E && ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1174 if (pos + 3 < E && ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1179 if (ANHE_at (he) <= minat)
1183 ev_active (ANHE_w (*minpos)) = k;
1189 ev_active (ANHE_w (he)) = k;
1195 #define HPARENT(k) ((k) >> 1)
1196 #define UPHEAP_DONE(p,k) (!(p))
1198 /* away from the root */
1200 downheap (ANHE *heap, int N, int k)
1211 c += c + 1 < N + HEAP0 && ANHE_at (heap [c]) > ANHE_at (heap [c + 1])
1214 if (ANHE_at (he) <= ANHE_at (heap [c]))
1217 heap [k] = heap [c];
1218 ev_active (ANHE_w (heap [k])) = k;
1224 ev_active (ANHE_w (he)) = k;
1228 /* towards the root */
1230 upheap (ANHE *heap, int k)
1236 int p = HPARENT (k);
1238 if (UPHEAP_DONE (p, k) || ANHE_at (heap [p]) <= ANHE_at (he))
1241 heap [k] = heap [p];
1242 ev_active (ANHE_w (heap [k])) = k;
1247 ev_active (ANHE_w (he)) = k;
1250 /* move an element suitably so it is in a correct place */
1252 adjustheap (ANHE *heap, int N, int k)
1254 if (k > HEAP0 && ANHE_at (heap [k]) <= ANHE_at (heap [HPARENT (k)]))
1257 downheap (heap, N, k);
1260 /* rebuild the heap: this function is used only once and executed rarely */
1262 reheap (ANHE *heap, int N)
1266 /* we don't use floyds algorithm, upheap is simpler and is more cache-efficient */
1267 /* also, this is easy to implement and correct for both 2-heaps and 4-heaps */
1268 for (i = 0; i < N; ++i)
1269 upheap (heap, i + HEAP0);
1272 /*****************************************************************************/
1274 /* associate signal watchers to a signal signal */
1277 EV_ATOMIC_T pending;
1284 static ANSIG signals [EV_NSIG - 1];
1286 /*****************************************************************************/
1288 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
1290 static void noinline
1293 if (!ev_is_active (&pipe_w))
1296 evfd = eventfd (0, EFD_NONBLOCK | EFD_CLOEXEC);
1297 if (evfd < 0 && errno == EINVAL)
1298 evfd = eventfd (0, 0);
1303 fd_intern (evfd); /* doing it twice doesn't hurt */
1304 ev_io_set (&pipe_w, evfd, EV_READ);
1309 while (pipe (evpipe))
1310 ev_syserr ("(libev) error creating signal/async pipe");
1312 fd_intern (evpipe [0]);
1313 fd_intern (evpipe [1]);
1314 ev_io_set (&pipe_w, evpipe [0], EV_READ);
1317 ev_io_start (EV_A_ &pipe_w);
1318 ev_unref (EV_A); /* watcher should not keep loop alive */
1323 evpipe_write (EV_P_ EV_ATOMIC_T *flag)
1327 int old_errno = errno; /* save errno because write might clobber it */
1335 uint64_t counter = 1;
1336 write (evfd, &counter, sizeof (uint64_t));
1340 /* win32 people keep sending patches that change this write() to send() */
1341 /* and then run away. but send() is wrong, it wants a socket handle on win32 */
1342 /* so when you think this write should be a send instead, please find out */
1343 /* where your send() is from - it's definitely not the microsoft send, and */
1344 /* tell me. thank you. */
1345 write (evpipe [1], &dummy, 1);
1351 /* called whenever the libev signal pipe */
1352 /* got some events (signal, async) */
1354 pipecb (EV_P_ ev_io *iow, int revents)
1362 read (evfd, &counter, sizeof (uint64_t));
1368 /* see discussion in evpipe_write when you think this read should be recv in win32 */
1369 read (evpipe [0], &dummy, 1);
1372 #if EV_SIGNAL_ENABLE
1377 for (i = EV_NSIG - 1; i--; )
1378 if (expect_false (signals [i].pending))
1379 ev_feed_signal_event (EV_A_ i + 1);
1388 for (i = asynccnt; i--; )
1389 if (asyncs [i]->sent)
1391 asyncs [i]->sent = 0;
1392 ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
1398 /*****************************************************************************/
1401 ev_feed_signal (int signum)
1404 EV_P = signals [signum - 1].loop;
1410 signals [signum - 1].pending = 1;
1411 evpipe_write (EV_A_ &sig_pending);
1415 ev_sighandler (int signum)
1418 signal (signum, ev_sighandler);
1421 ev_feed_signal (signum);
1425 ev_feed_signal_event (EV_P_ int signum)
1429 if (expect_false (signum <= 0 || signum > EV_NSIG))
1435 /* it is permissible to try to feed a signal to the wrong loop */
1436 /* or, likely more useful, feeding a signal nobody is waiting for */
1438 if (expect_false (signals [signum].loop != EV_A))
1442 signals [signum].pending = 0;
1444 for (w = signals [signum].head; w; w = w->next)
1445 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
1450 sigfdcb (EV_P_ ev_io *iow, int revents)
1452 struct signalfd_siginfo si[2], *sip; /* these structs are big */
1456 ssize_t res = read (sigfd, si, sizeof (si));
1458 /* not ISO-C, as res might be -1, but works with SuS */
1459 for (sip = si; (char *)sip < (char *)si + res; ++sip)
1460 ev_feed_signal_event (EV_A_ sip->ssi_signo);
1462 if (res < (ssize_t)sizeof (si))
1470 /*****************************************************************************/
1473 static WL childs [EV_PID_HASHSIZE];
1475 static ev_signal childev;
1477 #ifndef WIFCONTINUED
1478 # define WIFCONTINUED(status) 0
1481 /* handle a single child status event */
1483 child_reap (EV_P_ int chain, int pid, int status)
1486 int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
1488 for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next)
1490 if ((w->pid == pid || !w->pid)
1491 && (!traced || (w->flags & 1)))
1493 ev_set_priority (w, EV_MAXPRI); /* need to do it *now*, this *must* be the same prio as the signal watcher itself */
1495 w->rstatus = status;
1496 ev_feed_event (EV_A_ (W)w, EV_CHILD);
1502 # define WCONTINUED 0
1505 /* called on sigchld etc., calls waitpid */
1507 childcb (EV_P_ ev_signal *sw, int revents)
1511 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
1512 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
1515 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
1518 /* make sure we are called again until all children have been reaped */
1519 /* we need to do it this way so that the callback gets called before we continue */
1520 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
1522 child_reap (EV_A_ pid, pid, status);
1523 if ((EV_PID_HASHSIZE) > 1)
1524 child_reap (EV_A_ 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
1529 /*****************************************************************************/
1532 # include "ev_iocp.c"
1535 # include "ev_port.c"
1538 # include "ev_kqueue.c"
1541 # include "ev_epoll.c"
1544 # include "ev_poll.c"
1547 # include "ev_select.c"
1551 ev_version_major (void)
1553 return EV_VERSION_MAJOR;
1557 ev_version_minor (void)
1559 return EV_VERSION_MINOR;
1562 /* return true if we are running with elevated privileges and should ignore env variables */
1564 enable_secure (void)
1569 return getuid () != geteuid ()
1570 || getgid () != getegid ();
1575 ev_supported_backends (void)
1577 unsigned int flags = 0;
1579 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
1580 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
1581 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
1582 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
1583 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
1589 ev_recommended_backends (void)
1591 unsigned int flags = ev_supported_backends ();
1594 /* kqueue is borked on everything but netbsd apparently */
1595 /* it usually doesn't work correctly on anything but sockets and pipes */
1596 flags &= ~EVBACKEND_KQUEUE;
1599 /* only select works correctly on that "unix-certified" platform */
1600 flags &= ~EVBACKEND_KQUEUE; /* horribly broken, even for sockets */
1601 flags &= ~EVBACKEND_POLL; /* poll is based on kqueue from 10.5 onwards */
1604 flags &= ~EVBACKEND_POLL; /* poll return value is unusable (http://forums.freebsd.org/archive/index.php/t-10270.html) */
1611 ev_embeddable_backends (void)
1613 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
1615 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
1616 if (ev_linux_version () < 0x020620) /* disable it on linux < 2.6.32 */
1617 flags &= ~EVBACKEND_EPOLL;
1642 ev_set_io_collect_interval (EV_P_ ev_tstamp interval)
1644 io_blocktime = interval;
1648 ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval)
1650 timeout_blocktime = interval;
1654 ev_set_userdata (EV_P_ void *data)
1665 void ev_set_invoke_pending_cb (EV_P_ void (*invoke_pending_cb)(EV_P))
1667 invoke_cb = invoke_pending_cb;
1670 void ev_set_loop_release_cb (EV_P_ void (*release)(EV_P), void (*acquire)(EV_P))
1672 release_cb = release;
1673 acquire_cb = acquire;
1677 /* initialise a loop structure, must be zero-initialised */
1678 static void noinline
1679 loop_init (EV_P_ unsigned int flags)
1690 if (!clock_gettime (CLOCK_REALTIME, &ts))
1695 #if EV_USE_MONOTONIC
1696 if (!have_monotonic)
1700 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
1705 /* pid check not overridable via env */
1707 if (flags & EVFLAG_FORKCHECK)
1711 if (!(flags & EVFLAG_NOENV)
1712 && !enable_secure ()
1713 && getenv ("LIBEV_FLAGS"))
1714 flags = atoi (getenv ("LIBEV_FLAGS"));
1716 ev_rt_now = ev_time ();
1717 mn_now = get_clock ();
1719 rtmn_diff = ev_rt_now - mn_now;
1721 invoke_cb = ev_invoke_pending;
1725 timeout_blocktime = 0.;
1733 fs_fd = flags & EVFLAG_NOINOTIFY ? -1 : -2;
1736 sigfd = flags & EVFLAG_SIGNALFD ? -2 : -1;
1739 if (!(flags & EVBACKEND_MASK))
1740 flags |= ev_recommended_backends ();
1743 if (!backend && (flags & EVBACKEND_IOCP )) backend = iocp_init (EV_A_ flags);
1746 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
1749 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
1752 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
1755 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
1758 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
1761 ev_prepare_init (&pending_w, pendingcb);
1763 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
1764 ev_init (&pipe_w, pipecb);
1765 ev_set_priority (&pipe_w, EV_MAXPRI);
1770 /* free up a loop structure */
1772 ev_loop_destroy (EV_P)
1777 /* mimic free (0) */
1782 #if EV_CLEANUP_ENABLE
1783 /* queue cleanup watchers (and execute them) */
1784 if (expect_false (cleanupcnt))
1786 queue_events (EV_A_ (W *)cleanups, cleanupcnt, EV_CLEANUP);
1792 if (ev_is_active (&childev))
1794 ev_ref (EV_A); /* child watcher */
1795 ev_signal_stop (EV_A_ &childev);
1799 if (ev_is_active (&pipe_w))
1802 /*ev_io_stop (EV_A_ &pipe_w);*/
1809 if (evpipe [0] >= 0)
1811 EV_WIN32_CLOSE_FD (evpipe [0]);
1812 EV_WIN32_CLOSE_FD (evpipe [1]);
1817 if (ev_is_active (&sigfd_w))
1826 if (backend_fd >= 0)
1830 if (backend == EVBACKEND_IOCP ) iocp_destroy (EV_A);
1833 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
1836 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
1839 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
1842 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
1845 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
1848 for (i = NUMPRI; i--; )
1850 array_free (pending, [i]);
1852 array_free (idle, [i]);
1856 ev_free (anfds); anfds = 0; anfdmax = 0;
1858 /* have to use the microsoft-never-gets-it-right macro */
1859 array_free (rfeed, EMPTY);
1860 array_free (fdchange, EMPTY);
1861 array_free (timer, EMPTY);
1862 #if EV_PERIODIC_ENABLE
1863 array_free (periodic, EMPTY);
1866 array_free (fork, EMPTY);
1868 #if EV_CLEANUP_ENABLE
1869 array_free (cleanup, EMPTY);
1871 array_free (prepare, EMPTY);
1872 array_free (check, EMPTY);
1874 array_free (async, EMPTY);
1880 if (ev_is_default_loop (EV_A))
1882 ev_default_loop_ptr = 0;
1890 inline_size void infy_fork (EV_P);
1897 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
1900 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
1903 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
1909 if (ev_is_active (&pipe_w))
1911 /* this "locks" the handlers against writing to the pipe */
1912 /* while we modify the fd vars */
1919 ev_io_stop (EV_A_ &pipe_w);
1926 if (evpipe [0] >= 0)
1928 EV_WIN32_CLOSE_FD (evpipe [0]);
1929 EV_WIN32_CLOSE_FD (evpipe [1]);
1932 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
1934 /* now iterate over everything, in case we missed something */
1935 pipecb (EV_A_ &pipe_w, EV_READ);
1945 ev_loop_new (unsigned int flags)
1947 EV_P = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
1949 memset (EV_A, 0, sizeof (struct ev_loop));
1950 loop_init (EV_A_ flags);
1952 if (ev_backend (EV_A))
1959 #endif /* multiplicity */
1962 ev_loop_refcount (EV_P)
1968 static void noinline
1969 verify_watcher (EV_P_ W w)
1971 assert (("libev: watcher has invalid priority", ABSPRI (w) >= 0 && ABSPRI (w) < NUMPRI));
1974 assert (("libev: pending watcher not on pending queue", pendings [ABSPRI (w)][w->pending - 1].w == w));
1977 static void noinline
1978 verify_heap (EV_P_ ANHE *heap, int N)
1982 for (i = HEAP0; i < N + HEAP0; ++i)
1984 assert (("libev: active index mismatch in heap", ev_active (ANHE_w (heap [i])) == i));
1985 assert (("libev: heap condition violated", i == HEAP0 || ANHE_at (heap [HPARENT (i)]) <= ANHE_at (heap [i])));
1986 assert (("libev: heap at cache mismatch", ANHE_at (heap [i]) == ev_at (ANHE_w (heap [i]))));
1988 verify_watcher (EV_A_ (W)ANHE_w (heap [i]));
1992 static void noinline
1993 array_verify (EV_P_ W *ws, int cnt)
1997 assert (("libev: active index mismatch", ev_active (ws [cnt]) == cnt + 1));
1998 verify_watcher (EV_A_ ws [cnt]);
2011 assert (activecnt >= -1);
2013 assert (fdchangemax >= fdchangecnt);
2014 for (i = 0; i < fdchangecnt; ++i)
2015 assert (("libev: negative fd in fdchanges", fdchanges [i] >= 0));
2017 assert (anfdmax >= 0);
2018 for (i = 0; i < anfdmax; ++i)
2019 for (w = anfds [i].head; w; w = w->next)
2021 verify_watcher (EV_A_ (W)w);
2022 assert (("libev: inactive fd watcher on anfd list", ev_active (w) == 1));
2023 assert (("libev: fd mismatch between watcher and anfd", ((ev_io *)w)->fd == i));
2026 assert (timermax >= timercnt);
2027 verify_heap (EV_A_ timers, timercnt);
2029 #if EV_PERIODIC_ENABLE
2030 assert (periodicmax >= periodiccnt);
2031 verify_heap (EV_A_ periodics, periodiccnt);
2034 for (i = NUMPRI; i--; )
2036 assert (pendingmax [i] >= pendingcnt [i]);
2038 assert (idleall >= 0);
2039 assert (idlemax [i] >= idlecnt [i]);
2040 array_verify (EV_A_ (W *)idles [i], idlecnt [i]);
2045 assert (forkmax >= forkcnt);
2046 array_verify (EV_A_ (W *)forks, forkcnt);
2049 #if EV_CLEANUP_ENABLE
2050 assert (cleanupmax >= cleanupcnt);
2051 array_verify (EV_A_ (W *)cleanups, cleanupcnt);
2055 assert (asyncmax >= asynccnt);
2056 array_verify (EV_A_ (W *)asyncs, asynccnt);
2059 #if EV_PREPARE_ENABLE
2060 assert (preparemax >= preparecnt);
2061 array_verify (EV_A_ (W *)prepares, preparecnt);
2065 assert (checkmax >= checkcnt);
2066 array_verify (EV_A_ (W *)checks, checkcnt);
2071 for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next)
2072 for (signum = EV_NSIG; signum--; ) if (signals [signum].pending)
2084 ev_default_loop (unsigned int flags)
2086 if (!ev_default_loop_ptr)
2089 EV_P = ev_default_loop_ptr = &default_loop_struct;
2091 ev_default_loop_ptr = 1;
2094 loop_init (EV_A_ flags);
2096 if (ev_backend (EV_A))
2099 ev_signal_init (&childev, childcb, SIGCHLD);
2100 ev_set_priority (&childev, EV_MAXPRI);
2101 ev_signal_start (EV_A_ &childev);
2102 ev_unref (EV_A); /* child watcher should not keep loop alive */
2106 ev_default_loop_ptr = 0;
2109 return ev_default_loop_ptr;
2115 postfork = 1; /* must be in line with ev_default_fork */
2118 /*****************************************************************************/
2121 ev_invoke (EV_P_ void *w, int revents)
2123 EV_CB_INVOKE ((W)w, revents);
2127 ev_pending_count (EV_P)
2130 unsigned int count = 0;
2132 for (pri = NUMPRI; pri--; )
2133 count += pendingcnt [pri];
2139 ev_invoke_pending (EV_P)
2143 for (pri = NUMPRI; pri--; )
2144 while (pendingcnt [pri])
2146 ANPENDING *p = pendings [pri] + --pendingcnt [pri];
2149 EV_CB_INVOKE (p->w, p->events);
2155 /* make idle watchers pending. this handles the "call-idle */
2156 /* only when higher priorities are idle" logic */
2160 if (expect_false (idleall))
2164 for (pri = NUMPRI; pri--; )
2166 if (pendingcnt [pri])
2171 queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
2179 /* make timers pending */
2185 if (timercnt && ANHE_at (timers [HEAP0]) < mn_now)
2189 ev_timer *w = (ev_timer *)ANHE_w (timers [HEAP0]);
2191 /*assert (("libev: inactive timer on timer heap detected", ev_is_active (w)));*/
2193 /* first reschedule or stop timer */
2196 ev_at (w) += w->repeat;
2197 if (ev_at (w) < mn_now)
2200 assert (("libev: negative ev_timer repeat value found while processing timers", w->repeat > 0.));
2202 ANHE_at_cache (timers [HEAP0]);
2203 downheap (timers, timercnt, HEAP0);
2206 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
2209 feed_reverse (EV_A_ (W)w);
2211 while (timercnt && ANHE_at (timers [HEAP0]) < mn_now);
2213 feed_reverse_done (EV_A_ EV_TIMER);
2217 #if EV_PERIODIC_ENABLE
2220 periodic_recalc (EV_P_ ev_periodic *w)
2222 /* TODO: use slow but potentially more correct incremental algo, */
2223 /* also do not rely on ceil */
2224 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
2227 /* make periodics pending */
2229 periodics_reify (EV_P)
2233 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now)
2239 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [HEAP0]);
2241 /*assert (("libev: inactive timer on periodic heap detected", ev_is_active (w)));*/
2243 /* first reschedule or stop timer */
2244 if (w->reschedule_cb)
2246 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2248 assert (("libev: ev_periodic reschedule callback returned time in the past", ev_at (w) >= ev_rt_now));
2250 ANHE_at_cache (periodics [HEAP0]);
2251 downheap (periodics, periodiccnt, HEAP0);
2253 else if (w->interval)
2255 periodic_recalc (EV_A_ w);
2257 /* if next trigger time is not sufficiently in the future, put it there */
2258 /* this might happen because of floating point inexactness */
2259 if (ev_at (w) - ev_rt_now < TIME_EPSILON)
2261 ev_at (w) += w->interval;
2263 /* if interval is unreasonably low we might still have a time in the past */
2264 /* so correct this. this will make the periodic very inexact, but the user */
2265 /* has effectively asked to get triggered more often than possible */
2266 if (ev_at (w) < ev_rt_now)
2267 ev_at (w) = ev_rt_now;
2270 ANHE_at_cache (periodics [HEAP0]);
2271 downheap (periodics, periodiccnt, HEAP0);
2274 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
2277 feed_reverse (EV_A_ (W)w);
2279 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now);
2281 feed_reverse_done (EV_A_ EV_PERIODIC);
2285 /* simply recalculate all periodics */
2286 /* TODO: maybe ensure that at least one event happens when jumping forward? */
2287 static void noinline
2288 periodics_reschedule (EV_P)
2292 /* adjust periodics after time jump */
2293 for (i = HEAP0; i < periodiccnt + HEAP0; ++i)
2295 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [i]);
2297 if (w->reschedule_cb)
2298 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2299 else if (w->interval)
2300 periodic_recalc (EV_A_ w);
2302 ANHE_at_cache (periodics [i]);
2305 reheap (periodics, periodiccnt);
2309 /* adjust all timers by a given offset */
2310 static void noinline
2311 timers_reschedule (EV_P_ ev_tstamp adjust)
2315 for (i = 0; i < timercnt; ++i)
2317 ANHE *he = timers + i + HEAP0;
2318 ANHE_w (*he)->at += adjust;
2319 ANHE_at_cache (*he);
2323 /* fetch new monotonic and realtime times from the kernel */
2324 /* also detect if there was a timejump, and act accordingly */
2326 time_update (EV_P_ ev_tstamp max_block)
2328 #if EV_USE_MONOTONIC
2329 if (expect_true (have_monotonic))
2332 ev_tstamp odiff = rtmn_diff;
2334 mn_now = get_clock ();
2336 /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
2337 /* interpolate in the meantime */
2338 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
2340 ev_rt_now = rtmn_diff + mn_now;
2345 ev_rt_now = ev_time ();
2347 /* loop a few times, before making important decisions.
2348 * on the choice of "4": one iteration isn't enough,
2349 * in case we get preempted during the calls to
2350 * ev_time and get_clock. a second call is almost guaranteed
2351 * to succeed in that case, though. and looping a few more times
2352 * doesn't hurt either as we only do this on time-jumps or
2353 * in the unlikely event of having been preempted here.
2357 rtmn_diff = ev_rt_now - mn_now;
2359 if (expect_true (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP))
2360 return; /* all is well */
2362 ev_rt_now = ev_time ();
2363 mn_now = get_clock ();
2367 /* no timer adjustment, as the monotonic clock doesn't jump */
2368 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
2369 # if EV_PERIODIC_ENABLE
2370 periodics_reschedule (EV_A);
2376 ev_rt_now = ev_time ();
2378 if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
2380 /* adjust timers. this is easy, as the offset is the same for all of them */
2381 timers_reschedule (EV_A_ ev_rt_now - mn_now);
2382 #if EV_PERIODIC_ENABLE
2383 periodics_reschedule (EV_A);
2392 ev_run (EV_P_ int flags)
2398 assert (("libev: ev_loop recursion during release detected", loop_done != EVBREAK_RECURSE));
2400 loop_done = EVBREAK_CANCEL;
2402 EV_INVOKE_PENDING; /* in case we recurse, ensure ordering stays nice and clean */
2411 if (expect_false (curpid)) /* penalise the forking check even more */
2412 if (expect_false (getpid () != curpid))
2420 /* we might have forked, so queue fork handlers */
2421 if (expect_false (postfork))
2424 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
2429 #if EV_PREPARE_ENABLE
2430 /* queue prepare watchers (and execute them) */
2431 if (expect_false (preparecnt))
2433 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
2438 if (expect_false (loop_done))
2441 /* we might have forked, so reify kernel state if necessary */
2442 if (expect_false (postfork))
2445 /* update fd-related kernel structures */
2448 /* calculate blocking time */
2450 ev_tstamp waittime = 0.;
2451 ev_tstamp sleeptime = 0.;
2453 /* remember old timestamp for io_blocktime calculation */
2454 ev_tstamp prev_mn_now = mn_now;
2456 /* update time to cancel out callback processing overhead */
2457 time_update (EV_A_ 1e100);
2459 if (expect_true (!(flags & EVRUN_NOWAIT || idleall || !activecnt)))
2461 waittime = MAX_BLOCKTIME;
2465 ev_tstamp to = ANHE_at (timers [HEAP0]) - mn_now + backend_fudge;
2466 if (waittime > to) waittime = to;
2469 #if EV_PERIODIC_ENABLE
2472 ev_tstamp to = ANHE_at (periodics [HEAP0]) - ev_rt_now + backend_fudge;
2473 if (waittime > to) waittime = to;
2477 /* don't let timeouts decrease the waittime below timeout_blocktime */
2478 if (expect_false (waittime < timeout_blocktime))
2479 waittime = timeout_blocktime;
2481 /* extra check because io_blocktime is commonly 0 */
2482 if (expect_false (io_blocktime))
2484 sleeptime = io_blocktime - (mn_now - prev_mn_now);
2486 if (sleeptime > waittime - backend_fudge)
2487 sleeptime = waittime - backend_fudge;
2489 if (expect_true (sleeptime > 0.))
2491 ev_sleep (sleeptime);
2492 waittime -= sleeptime;
2500 assert ((loop_done = EVBREAK_RECURSE, 1)); /* assert for side effect */
2501 backend_poll (EV_A_ waittime);
2502 assert ((loop_done = EVBREAK_CANCEL, 1)); /* assert for side effect */
2504 /* update ev_rt_now, do magic */
2505 time_update (EV_A_ waittime + sleeptime);
2508 /* queue pending timers and reschedule them */
2509 timers_reify (EV_A); /* relative timers called last */
2510 #if EV_PERIODIC_ENABLE
2511 periodics_reify (EV_A); /* absolute timers called first */
2515 /* queue idle watchers unless other events are pending */
2520 /* queue check watchers, to be executed first */
2521 if (expect_false (checkcnt))
2522 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
2527 while (expect_true (
2530 && !(flags & (EVRUN_ONCE | EVRUN_NOWAIT))
2533 if (loop_done == EVBREAK_ONE)
2534 loop_done = EVBREAK_CANCEL;
2542 ev_break (EV_P_ int how)
2560 ev_now_update (EV_P)
2562 time_update (EV_A_ 1e100);
2568 ev_now_update (EV_A);
2574 ev_tstamp mn_prev = mn_now;
2576 ev_now_update (EV_A);
2577 timers_reschedule (EV_A_ mn_now - mn_prev);
2578 #if EV_PERIODIC_ENABLE
2579 /* TODO: really do this? */
2580 periodics_reschedule (EV_A);
2584 /*****************************************************************************/
2585 /* singly-linked list management, used when the expected list length is short */
2588 wlist_add (WL *head, WL elem)
2595 wlist_del (WL *head, WL elem)
2599 if (expect_true (*head == elem))
2605 head = &(*head)->next;
2609 /* internal, faster, version of ev_clear_pending */
2611 clear_pending (EV_P_ W w)
2615 pendings [ABSPRI (w)][w->pending - 1].w = (W)&pending_w;
2621 ev_clear_pending (EV_P_ void *w)
2624 int pending = w_->pending;
2626 if (expect_true (pending))
2628 ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
2629 p->w = (W)&pending_w;
2638 pri_adjust (EV_P_ W w)
2640 int pri = ev_priority (w);
2641 pri = pri < EV_MINPRI ? EV_MINPRI : pri;
2642 pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
2643 ev_set_priority (w, pri);
2647 ev_start (EV_P_ W w, int active)
2649 pri_adjust (EV_A_ w);
2661 /*****************************************************************************/
2664 ev_io_start (EV_P_ ev_io *w)
2668 if (expect_false (ev_is_active (w)))
2671 assert (("libev: ev_io_start called with negative fd", fd >= 0));
2672 assert (("libev: ev_io_start called with illegal event mask",
2673 !(w->events & ~(EV__IOFDSET | EV_READ | EV_WRITE | EV_LIBUV_KQUEUE_HACK))));
2677 ev_start (EV_A_ (W)w, 1);
2678 array_needsize (ANFD, anfds, anfdmax, fd + 1, array_init_zero);
2679 wlist_add (&anfds[fd].head, (WL)w);
2681 fd_change (EV_A_ fd, w->events & EV__IOFDSET | EV_ANFD_REIFY);
2682 w->events &= ~EV__IOFDSET;
2688 ev_io_stop (EV_P_ ev_io *w)
2690 clear_pending (EV_A_ (W)w);
2691 if (expect_false (!ev_is_active (w)))
2694 assert (("libev: ev_io_stop called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
2698 wlist_del (&anfds[w->fd].head, (WL)w);
2699 ev_stop (EV_A_ (W)w);
2701 fd_change (EV_A_ w->fd, EV_ANFD_REIFY);
2707 ev_timer_start (EV_P_ ev_timer *w)
2709 if (expect_false (ev_is_active (w)))
2712 ev_at (w) += mn_now;
2714 assert (("libev: ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
2719 ev_start (EV_A_ (W)w, timercnt + HEAP0 - 1);
2720 array_needsize (ANHE, timers, timermax, ev_active (w) + 1, EMPTY2);
2721 ANHE_w (timers [ev_active (w)]) = (WT)w;
2722 ANHE_at_cache (timers [ev_active (w)]);
2723 upheap (timers, ev_active (w));
2727 /*assert (("libev: internal timer heap corruption", timers [ev_active (w)] == (WT)w));*/
2731 ev_timer_stop (EV_P_ ev_timer *w)
2733 clear_pending (EV_A_ (W)w);
2734 if (expect_false (!ev_is_active (w)))
2740 int active = ev_active (w);
2742 assert (("libev: internal timer heap corruption", ANHE_w (timers [active]) == (WT)w));
2746 if (expect_true (active < timercnt + HEAP0))
2748 timers [active] = timers [timercnt + HEAP0];
2749 adjustheap (timers, timercnt, active);
2753 ev_at (w) -= mn_now;
2755 ev_stop (EV_A_ (W)w);
2761 ev_timer_again (EV_P_ ev_timer *w)
2765 if (ev_is_active (w))
2769 ev_at (w) = mn_now + w->repeat;
2770 ANHE_at_cache (timers [ev_active (w)]);
2771 adjustheap (timers, timercnt, ev_active (w));
2774 ev_timer_stop (EV_A_ w);
2778 ev_at (w) = w->repeat;
2779 ev_timer_start (EV_A_ w);
2786 ev_timer_remaining (EV_P_ ev_timer *w)
2788 return ev_at (w) - (ev_is_active (w) ? mn_now : 0.);
2791 #if EV_PERIODIC_ENABLE
2793 ev_periodic_start (EV_P_ ev_periodic *w)
2795 if (expect_false (ev_is_active (w)))
2798 if (w->reschedule_cb)
2799 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2800 else if (w->interval)
2802 assert (("libev: ev_periodic_start called with negative interval value", w->interval >= 0.));
2803 periodic_recalc (EV_A_ w);
2806 ev_at (w) = w->offset;
2811 ev_start (EV_A_ (W)w, periodiccnt + HEAP0 - 1);
2812 array_needsize (ANHE, periodics, periodicmax, ev_active (w) + 1, EMPTY2);
2813 ANHE_w (periodics [ev_active (w)]) = (WT)w;
2814 ANHE_at_cache (periodics [ev_active (w)]);
2815 upheap (periodics, ev_active (w));
2819 /*assert (("libev: internal periodic heap corruption", ANHE_w (periodics [ev_active (w)]) == (WT)w));*/
2823 ev_periodic_stop (EV_P_ ev_periodic *w)
2825 clear_pending (EV_A_ (W)w);
2826 if (expect_false (!ev_is_active (w)))
2832 int active = ev_active (w);
2834 assert (("libev: internal periodic heap corruption", ANHE_w (periodics [active]) == (WT)w));
2838 if (expect_true (active < periodiccnt + HEAP0))
2840 periodics [active] = periodics [periodiccnt + HEAP0];
2841 adjustheap (periodics, periodiccnt, active);
2845 ev_stop (EV_A_ (W)w);
2851 ev_periodic_again (EV_P_ ev_periodic *w)
2853 /* TODO: use adjustheap and recalculation */
2854 ev_periodic_stop (EV_A_ w);
2855 ev_periodic_start (EV_A_ w);
2860 # define SA_RESTART 0
2863 #if EV_SIGNAL_ENABLE
2866 ev_signal_start (EV_P_ ev_signal *w)
2868 if (expect_false (ev_is_active (w)))
2871 assert (("libev: ev_signal_start called with illegal signal number", w->signum > 0 && w->signum < EV_NSIG));
2874 assert (("libev: a signal must not be attached to two different loops",
2875 !signals [w->signum - 1].loop || signals [w->signum - 1].loop == loop));
2877 signals [w->signum - 1].loop = EV_A;
2885 sigfd = signalfd (-1, &sigfd_set, SFD_NONBLOCK | SFD_CLOEXEC);
2886 if (sigfd < 0 && errno == EINVAL)
2887 sigfd = signalfd (-1, &sigfd_set, 0); /* retry without flags */
2891 fd_intern (sigfd); /* doing it twice will not hurt */
2893 sigemptyset (&sigfd_set);
2895 ev_io_init (&sigfd_w, sigfdcb, sigfd, EV_READ);
2896 ev_set_priority (&sigfd_w, EV_MAXPRI);
2897 ev_io_start (EV_A_ &sigfd_w);
2898 ev_unref (EV_A); /* signalfd watcher should not keep loop alive */
2904 /* TODO: check .head */
2905 sigaddset (&sigfd_set, w->signum);
2906 sigprocmask (SIG_BLOCK, &sigfd_set, 0);
2908 signalfd (sigfd, &sigfd_set, 0);
2912 ev_start (EV_A_ (W)w, 1);
2913 wlist_add (&signals [w->signum - 1].head, (WL)w);
2916 # if EV_USE_SIGNALFD
2917 if (sigfd < 0) /*TODO*/
2923 signal (w->signum, ev_sighandler);
2925 struct sigaction sa;
2929 sa.sa_handler = ev_sighandler;
2930 sigfillset (&sa.sa_mask);
2931 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
2932 sigaction (w->signum, &sa, 0);
2934 if (origflags & EVFLAG_NOSIGMASK)
2936 sigemptyset (&sa.sa_mask);
2937 sigaddset (&sa.sa_mask, w->signum);
2938 sigprocmask (SIG_UNBLOCK, &sa.sa_mask, 0);
2947 ev_signal_stop (EV_P_ ev_signal *w)
2949 clear_pending (EV_A_ (W)w);
2950 if (expect_false (!ev_is_active (w)))
2955 wlist_del (&signals [w->signum - 1].head, (WL)w);
2956 ev_stop (EV_A_ (W)w);
2958 if (!signals [w->signum - 1].head)
2961 signals [w->signum - 1].loop = 0; /* unattach from signal */
2969 sigaddset (&ss, w->signum);
2970 sigdelset (&sigfd_set, w->signum);
2972 signalfd (sigfd, &sigfd_set, 0);
2973 sigprocmask (SIG_UNBLOCK, &ss, 0);
2977 signal (w->signum, SIG_DFL);
2988 ev_child_start (EV_P_ ev_child *w)
2991 assert (("libev: child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
2993 if (expect_false (ev_is_active (w)))
2998 ev_start (EV_A_ (W)w, 1);
2999 wlist_add (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);
3005 ev_child_stop (EV_P_ ev_child *w)
3007 clear_pending (EV_A_ (W)w);
3008 if (expect_false (!ev_is_active (w)))
3013 wlist_del (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);
3014 ev_stop (EV_A_ (W)w);
3025 # define lstat(a,b) _stati64 (a,b)
3028 #define DEF_STAT_INTERVAL 5.0074891
3029 #define NFS_STAT_INTERVAL 30.1074891 /* for filesystems potentially failing inotify */
3030 #define MIN_STAT_INTERVAL 0.1074891
3032 static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
3036 /* the * 2 is to allow for alignment padding, which for some reason is >> 8 */
3037 # define EV_INOTIFY_BUFSIZE (sizeof (struct inotify_event) * 2 + NAME_MAX)
3039 static void noinline
3040 infy_add (EV_P_ ev_stat *w)
3042 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);
3048 /* now local changes will be tracked by inotify, but remote changes won't */
3049 /* unless the filesystem is known to be local, we therefore still poll */
3050 /* also do poll on <2.6.25, but with normal frequency */
3053 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3054 else if (!statfs (w->path, &sfs)
3055 && (sfs.f_type == 0x1373 /* devfs */
3056 || sfs.f_type == 0xEF53 /* ext2/3 */
3057 || sfs.f_type == 0x3153464a /* jfs */
3058 || sfs.f_type == 0x52654973 /* reiser3 */
3059 || sfs.f_type == 0x01021994 /* tempfs */
3060 || sfs.f_type == 0x58465342 /* xfs */))
3061 w->timer.repeat = 0.; /* filesystem is local, kernel new enough */
3063 w->timer.repeat = w->interval ? w->interval : NFS_STAT_INTERVAL; /* remote, use reduced frequency */
3067 /* can't use inotify, continue to stat */
3068 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3070 /* if path is not there, monitor some parent directory for speedup hints */
3071 /* note that exceeding the hardcoded path limit is not a correctness issue, */
3072 /* but an efficiency issue only */
3073 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
3076 strcpy (path, w->path);
3080 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
3081 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
3083 char *pend = strrchr (path, '/');
3085 if (!pend || pend == path)
3089 w->wd = inotify_add_watch (fs_fd, path, mask);
3091 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
3096 wlist_add (&fs_hash [w->wd & ((EV_INOTIFY_HASHSIZE) - 1)].head, (WL)w);
3098 /* now re-arm timer, if required */
3099 if (ev_is_active (&w->timer)) ev_ref (EV_A);
3100 ev_timer_again (EV_A_ &w->timer);
3101 if (ev_is_active (&w->timer)) ev_unref (EV_A);
3104 static void noinline
3105 infy_del (EV_P_ ev_stat *w)
3114 slot = wd & ((EV_INOTIFY_HASHSIZE) - 1);
3115 wlist_del (&fs_hash [slot].head, (WL)w);
3117 /* remove this watcher, if others are watching it, they will rearm */
3118 inotify_rm_watch (fs_fd, wd);
3121 static void noinline
3122 infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
3125 /* overflow, need to check for all hash slots */
3126 for (slot = 0; slot < (EV_INOTIFY_HASHSIZE); ++slot)
3127 infy_wd (EV_A_ slot, wd, ev);
3132 for (w_ = fs_hash [slot & ((EV_INOTIFY_HASHSIZE) - 1)].head; w_; )
3134 ev_stat *w = (ev_stat *)w_;
3135 w_ = w_->next; /* lets us remove this watcher and all before it */
3137 if (w->wd == wd || wd == -1)
3139 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
3141 wlist_del (&fs_hash [slot & ((EV_INOTIFY_HASHSIZE) - 1)].head, (WL)w);
3143 infy_add (EV_A_ w); /* re-add, no matter what */
3146 stat_timer_cb (EV_A_ &w->timer, 0);
3153 infy_cb (EV_P_ ev_io *w, int revents)
3155 char buf [EV_INOTIFY_BUFSIZE];
3157 int len = read (fs_fd, buf, sizeof (buf));
3159 for (ofs = 0; ofs < len; )
3161 struct inotify_event *ev = (struct inotify_event *)(buf + ofs);
3162 infy_wd (EV_A_ ev->wd, ev->wd, ev);
3163 ofs += sizeof (struct inotify_event) + ev->len;
3168 ev_check_2625 (EV_P)
3170 /* kernels < 2.6.25 are borked
3171 * http://www.ussg.indiana.edu/hypermail/linux/kernel/0711.3/1208.html
3173 if (ev_linux_version () < 0x020619)
3182 #if defined (IN_CLOEXEC) && defined (IN_NONBLOCK)
3183 int fd = inotify_init1 (IN_CLOEXEC | IN_NONBLOCK);
3187 return inotify_init ();
3198 ev_check_2625 (EV_A);
3200 fs_fd = infy_newfd ();
3205 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
3206 ev_set_priority (&fs_w, EV_MAXPRI);
3207 ev_io_start (EV_A_ &fs_w);
3221 ev_io_stop (EV_A_ &fs_w);
3223 fs_fd = infy_newfd ();
3228 ev_io_set (&fs_w, fs_fd, EV_READ);
3229 ev_io_start (EV_A_ &fs_w);
3233 for (slot = 0; slot < (EV_INOTIFY_HASHSIZE); ++slot)
3235 WL w_ = fs_hash [slot].head;
3236 fs_hash [slot].head = 0;
3240 ev_stat *w = (ev_stat *)w_;
3241 w_ = w_->next; /* lets us add this watcher */
3246 infy_add (EV_A_ w); /* re-add, no matter what */
3249 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3250 if (ev_is_active (&w->timer)) ev_ref (EV_A);
3251 ev_timer_again (EV_A_ &w->timer);
3252 if (ev_is_active (&w->timer)) ev_unref (EV_A);
3261 # define EV_LSTAT(p,b) _stati64 (p, b)
3263 # define EV_LSTAT(p,b) lstat (p, b)
3267 ev_stat_stat (EV_P_ ev_stat *w)
3269 if (lstat (w->path, &w->attr) < 0)
3270 w->attr.st_nlink = 0;
3271 else if (!w->attr.st_nlink)
3272 w->attr.st_nlink = 1;
3275 static void noinline
3276 stat_timer_cb (EV_P_ ev_timer *w_, int revents)
3278 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
3280 ev_statdata prev = w->attr;
3281 ev_stat_stat (EV_A_ w);
3283 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
3285 prev.st_dev != w->attr.st_dev
3286 || prev.st_ino != w->attr.st_ino
3287 || prev.st_mode != w->attr.st_mode
3288 || prev.st_nlink != w->attr.st_nlink
3289 || prev.st_uid != w->attr.st_uid
3290 || prev.st_gid != w->attr.st_gid
3291 || prev.st_rdev != w->attr.st_rdev
3292 || prev.st_size != w->attr.st_size
3293 || prev.st_atime != w->attr.st_atime
3294 || prev.st_mtime != w->attr.st_mtime
3295 || prev.st_ctime != w->attr.st_ctime
3297 /* we only update w->prev on actual differences */
3298 /* in case we test more often than invoke the callback, */
3299 /* to ensure that prev is always different to attr */
3307 ev_stat_stat (EV_A_ w); /* avoid race... */
3311 ev_feed_event (EV_A_ w, EV_STAT);
3316 ev_stat_start (EV_P_ ev_stat *w)
3318 if (expect_false (ev_is_active (w)))
3321 ev_stat_stat (EV_A_ w);
3323 if (w->interval < MIN_STAT_INTERVAL && w->interval)
3324 w->interval = MIN_STAT_INTERVAL;
3326 ev_timer_init (&w->timer, stat_timer_cb, 0., w->interval ? w->interval : DEF_STAT_INTERVAL);
3327 ev_set_priority (&w->timer, ev_priority (w));
3337 ev_timer_again (EV_A_ &w->timer);
3341 ev_start (EV_A_ (W)w, 1);
3347 ev_stat_stop (EV_P_ ev_stat *w)
3349 clear_pending (EV_A_ (W)w);
3350 if (expect_false (!ev_is_active (w)))
3359 if (ev_is_active (&w->timer))
3362 ev_timer_stop (EV_A_ &w->timer);
3365 ev_stop (EV_A_ (W)w);
3373 ev_idle_start (EV_P_ ev_idle *w)
3375 if (expect_false (ev_is_active (w)))
3378 pri_adjust (EV_A_ (W)w);
3383 int active = ++idlecnt [ABSPRI (w)];
3386 ev_start (EV_A_ (W)w, active);
3388 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
3389 idles [ABSPRI (w)][active - 1] = w;
3396 ev_idle_stop (EV_P_ ev_idle *w)
3398 clear_pending (EV_A_ (W)w);
3399 if (expect_false (!ev_is_active (w)))
3405 int active = ev_active (w);
3407 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
3408 ev_active (idles [ABSPRI (w)][active - 1]) = active;
3410 ev_stop (EV_A_ (W)w);
3418 #if EV_PREPARE_ENABLE
3420 ev_prepare_start (EV_P_ ev_prepare *w)
3422 if (expect_false (ev_is_active (w)))
3427 ev_start (EV_A_ (W)w, ++preparecnt);
3428 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
3429 prepares [preparecnt - 1] = w;
3435 ev_prepare_stop (EV_P_ ev_prepare *w)
3437 clear_pending (EV_A_ (W)w);
3438 if (expect_false (!ev_is_active (w)))
3444 int active = ev_active (w);
3446 prepares [active - 1] = prepares [--preparecnt];
3447 ev_active (prepares [active - 1]) = active;
3450 ev_stop (EV_A_ (W)w);
3458 ev_check_start (EV_P_ ev_check *w)
3460 if (expect_false (ev_is_active (w)))
3465 ev_start (EV_A_ (W)w, ++checkcnt);
3466 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
3467 checks [checkcnt - 1] = w;
3473 ev_check_stop (EV_P_ ev_check *w)
3475 clear_pending (EV_A_ (W)w);
3476 if (expect_false (!ev_is_active (w)))
3482 int active = ev_active (w);
3484 checks [active - 1] = checks [--checkcnt];
3485 ev_active (checks [active - 1]) = active;
3488 ev_stop (EV_A_ (W)w);
3496 ev_embed_sweep (EV_P_ ev_embed *w)
3498 ev_run (w->other, EVRUN_NOWAIT);
3502 embed_io_cb (EV_P_ ev_io *io, int revents)
3504 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
3507 ev_feed_event (EV_A_ (W)w, EV_EMBED);
3509 ev_run (w->other, EVRUN_NOWAIT);
3513 embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
3515 ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
3523 ev_run (EV_A_ EVRUN_NOWAIT);
3529 embed_fork_cb (EV_P_ ev_fork *fork_w, int revents)
3531 ev_embed *w = (ev_embed *)(((char *)fork_w) - offsetof (ev_embed, fork));
3533 ev_embed_stop (EV_A_ w);
3538 ev_loop_fork (EV_A);
3539 ev_run (EV_A_ EVRUN_NOWAIT);
3542 ev_embed_start (EV_A_ w);
3547 embed_idle_cb (EV_P_ ev_idle *idle, int revents)
3549 ev_idle_stop (EV_A_ idle);
3554 ev_embed_start (EV_P_ ev_embed *w)
3556 if (expect_false (ev_is_active (w)))
3561 assert (("libev: loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
3562 ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
3567 ev_set_priority (&w->io, ev_priority (w));
3568 ev_io_start (EV_A_ &w->io);
3570 ev_prepare_init (&w->prepare, embed_prepare_cb);
3571 ev_set_priority (&w->prepare, EV_MINPRI);
3572 ev_prepare_start (EV_A_ &w->prepare);
3574 ev_fork_init (&w->fork, embed_fork_cb);
3575 ev_fork_start (EV_A_ &w->fork);
3577 /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
3579 ev_start (EV_A_ (W)w, 1);
3585 ev_embed_stop (EV_P_ ev_embed *w)
3587 clear_pending (EV_A_ (W)w);
3588 if (expect_false (!ev_is_active (w)))
3593 ev_io_stop (EV_A_ &w->io);
3594 ev_prepare_stop (EV_A_ &w->prepare);
3595 ev_fork_stop (EV_A_ &w->fork);
3597 ev_stop (EV_A_ (W)w);
3605 ev_fork_start (EV_P_ ev_fork *w)
3607 if (expect_false (ev_is_active (w)))
3612 ev_start (EV_A_ (W)w, ++forkcnt);
3613 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
3614 forks [forkcnt - 1] = w;
3620 ev_fork_stop (EV_P_ ev_fork *w)
3622 clear_pending (EV_A_ (W)w);
3623 if (expect_false (!ev_is_active (w)))
3629 int active = ev_active (w);
3631 forks [active - 1] = forks [--forkcnt];
3632 ev_active (forks [active - 1]) = active;
3635 ev_stop (EV_A_ (W)w);
3641 #if EV_CLEANUP_ENABLE
3643 ev_cleanup_start (EV_P_ ev_cleanup *w)
3645 if (expect_false (ev_is_active (w)))
3650 ev_start (EV_A_ (W)w, ++cleanupcnt);
3651 array_needsize (ev_cleanup *, cleanups, cleanupmax, cleanupcnt, EMPTY2);
3652 cleanups [cleanupcnt - 1] = w;
3654 /* cleanup watchers should never keep a refcount on the loop */
3660 ev_cleanup_stop (EV_P_ ev_cleanup *w)
3662 clear_pending (EV_A_ (W)w);
3663 if (expect_false (!ev_is_active (w)))
3670 int active = ev_active (w);
3672 cleanups [active - 1] = cleanups [--cleanupcnt];
3673 ev_active (cleanups [active - 1]) = active;
3676 ev_stop (EV_A_ (W)w);
3684 ev_async_start (EV_P_ ev_async *w)
3686 if (expect_false (ev_is_active (w)))
3695 ev_start (EV_A_ (W)w, ++asynccnt);
3696 array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
3697 asyncs [asynccnt - 1] = w;
3703 ev_async_stop (EV_P_ ev_async *w)
3705 clear_pending (EV_A_ (W)w);
3706 if (expect_false (!ev_is_active (w)))
3712 int active = ev_active (w);
3714 asyncs [active - 1] = asyncs [--asynccnt];
3715 ev_active (asyncs [active - 1]) = active;
3718 ev_stop (EV_A_ (W)w);
3724 ev_async_send (EV_P_ ev_async *w)
3727 evpipe_write (EV_A_ &async_pending);
3731 /*****************************************************************************/
3737 void (*cb)(int revents, void *arg);
3742 once_cb (EV_P_ struct ev_once *once, int revents)
3744 void (*cb)(int revents, void *arg) = once->cb;
3745 void *arg = once->arg;
3747 ev_io_stop (EV_A_ &once->io);
3748 ev_timer_stop (EV_A_ &once->to);
3755 once_cb_io (EV_P_ ev_io *w, int revents)
3757 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io));
3759 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->to));
3763 once_cb_to (EV_P_ ev_timer *w, int revents)
3765 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to));
3767 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->io));
3771 ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
3773 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
3775 if (expect_false (!once))
3777 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMER, arg);
3784 ev_init (&once->io, once_cb_io);
3787 ev_io_set (&once->io, fd, events);
3788 ev_io_start (EV_A_ &once->io);
3791 ev_init (&once->to, once_cb_to);
3794 ev_timer_set (&once->to, timeout, 0.);
3795 ev_timer_start (EV_A_ &once->to);
3799 /*****************************************************************************/
3803 ev_walk (EV_P_ int types, void (*cb)(EV_P_ int type, void *w))
3806 ev_watcher_list *wl, *wn;
3808 if (types & (EV_IO | EV_EMBED))
3809 for (i = 0; i < anfdmax; ++i)
3810 for (wl = anfds [i].head; wl; )
3815 if (ev_cb ((ev_io *)wl) == embed_io_cb)
3817 if (types & EV_EMBED)
3818 cb (EV_A_ EV_EMBED, ((char *)wl) - offsetof (struct ev_embed, io));
3823 if (ev_cb ((ev_io *)wl) == infy_cb)
3827 if ((ev_io *)wl != &pipe_w)
3829 cb (EV_A_ EV_IO, wl);
3834 if (types & (EV_TIMER | EV_STAT))
3835 for (i = timercnt + HEAP0; i-- > HEAP0; )
3837 /*TODO: timer is not always active*/
3838 if (ev_cb ((ev_timer *)ANHE_w (timers [i])) == stat_timer_cb)
3840 if (types & EV_STAT)
3841 cb (EV_A_ EV_STAT, ((char *)ANHE_w (timers [i])) - offsetof (struct ev_stat, timer));
3845 if (types & EV_TIMER)
3846 cb (EV_A_ EV_TIMER, ANHE_w (timers [i]));
3848 #if EV_PERIODIC_ENABLE
3849 if (types & EV_PERIODIC)
3850 for (i = periodiccnt + HEAP0; i-- > HEAP0; )
3851 cb (EV_A_ EV_PERIODIC, ANHE_w (periodics [i]));
3855 if (types & EV_IDLE)
3856 for (j = NUMPRI; j--; )
3857 for (i = idlecnt [j]; i--; )
3858 cb (EV_A_ EV_IDLE, idles [j][i]);
3862 if (types & EV_FORK)
3863 for (i = forkcnt; i--; )
3864 if (ev_cb (forks [i]) != embed_fork_cb)
3865 cb (EV_A_ EV_FORK, forks [i]);
3869 if (types & EV_ASYNC)
3870 for (i = asynccnt; i--; )
3871 cb (EV_A_ EV_ASYNC, asyncs [i]);
3874 #if EV_PREPARE_ENABLE
3875 if (types & EV_PREPARE)
3876 for (i = preparecnt; i--; )
3877 # if EV_EMBED_ENABLE
3878 if (ev_cb (prepares [i]) != embed_prepare_cb)
3880 cb (EV_A_ EV_PREPARE, prepares [i]);
3884 if (types & EV_CHECK)
3885 for (i = checkcnt; i--; )
3886 cb (EV_A_ EV_CHECK, checks [i]);
3889 #if EV_SIGNAL_ENABLE
3890 if (types & EV_SIGNAL)
3891 for (i = 0; i < EV_NSIG - 1; ++i)
3892 for (wl = signals [i].head; wl; )
3895 cb (EV_A_ EV_SIGNAL, wl);
3901 if (types & EV_CHILD)
3902 for (i = (EV_PID_HASHSIZE); i--; )
3903 for (wl = childs [i]; wl; )
3906 cb (EV_A_ EV_CHILD, wl);
3910 /* EV_STAT 0x00001000 /* stat data changed */
3911 /* EV_EMBED 0x00010000 /* embedded event loop needs sweep */
3916 #include "ev_wrap.h"