2 * libev event processing core, watcher management
4 * Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are
11 * * Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
14 * * Redistributions in binary form must reproduce the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer in the documentation and/or other materials provided
17 * with the distribution.
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
23 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
25 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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29 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
39 # if HAVE_CLOCK_GETTIME
40 # define EV_USE_MONOTONIC 1
41 # define EV_USE_REALTIME 1
44 # if HAVE_SELECT && HAVE_SYS_SELECT_H
45 # define EV_USE_SELECT 1
48 # if HAVE_POLL && HAVE_POLL_H
49 # define EV_USE_POLL 1
52 # if HAVE_EPOLL && HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
53 # define EV_USE_EPOLL 1
56 # if HAVE_KQUEUE && HAVE_SYS_EVENT_H && HAVE_SYS_QUEUE_H
57 # define EV_USE_KQUEUE 1
71 #include <sys/types.h>
78 # include <sys/time.h>
79 # include <sys/wait.h>
83 #ifndef EV_USE_MONOTONIC
84 # define EV_USE_MONOTONIC 1
88 # define EV_USE_SELECT 1
92 # define EV_USE_POLL 0 /* poll is usually slower than select, and not as well tested */
96 # define EV_USE_EPOLL 0
100 # define EV_USE_KQUEUE 0
105 # define EV_USE_WIN32 0 /* it does not exist, use select */
106 # undef EV_USE_SELECT
107 # define EV_USE_SELECT 1
109 # define EV_USE_WIN32 0
113 #ifndef EV_USE_REALTIME
114 # define EV_USE_REALTIME 1
119 #ifndef CLOCK_MONOTONIC
120 # undef EV_USE_MONOTONIC
121 # define EV_USE_MONOTONIC 0
124 #ifndef CLOCK_REALTIME
125 # undef EV_USE_REALTIME
126 # define EV_USE_REALTIME 0
131 #define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
132 #define MAX_BLOCKTIME 59.731 /* never wait longer than this time (to detect time jumps) */
133 #define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
134 /*#define CLEANUP_INTERVAL 300. /* how often to try to free memory and re-check fds */
143 # define expect(expr,value) __builtin_expect ((expr),(value))
144 # define inline inline
146 # define expect(expr,value) (expr)
147 # define inline static
150 #define expect_false(expr) expect ((expr) != 0, 0)
151 #define expect_true(expr) expect ((expr) != 0, 1)
153 #define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
154 #define ABSPRI(w) ((w)->priority - EV_MINPRI)
156 typedef struct ev_watcher *W;
157 typedef struct ev_watcher_list *WL;
158 typedef struct ev_watcher_time *WT;
160 static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
162 #include "ev_win32.c"
164 /*****************************************************************************/
166 static void (*syserr_cb)(const char *msg);
168 void ev_set_syserr_cb (void (*cb)(const char *msg))
174 syserr (const char *msg)
177 msg = "(libev) system error";
188 static void *(*alloc)(void *ptr, long size);
190 void ev_set_allocator (void *(*cb)(void *ptr, long size))
196 ev_realloc (void *ptr, long size)
198 ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
202 fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
209 #define ev_malloc(size) ev_realloc (0, (size))
210 #define ev_free(ptr) ev_realloc ((ptr), 0)
212 /*****************************************************************************/
217 unsigned char events;
232 #define VAR(name,decl) decl;
238 struct ev_loop default_loop_struct;
239 static struct ev_loop *default_loop;
244 #define VAR(name,decl) static decl;
248 static int default_loop;
252 /*****************************************************************************/
259 clock_gettime (CLOCK_REALTIME, &ts);
260 return ts.tv_sec + ts.tv_nsec * 1e-9;
263 gettimeofday (&tv, 0);
264 return tv.tv_sec + tv.tv_usec * 1e-6;
272 if (expect_true (have_monotonic))
275 clock_gettime (CLOCK_MONOTONIC, &ts);
276 return ts.tv_sec + ts.tv_nsec * 1e-9;
291 #define array_roundsize(type,n) ((n) | 4 & ~3)
293 #define array_needsize(type,base,cur,cnt,init) \
294 if (expect_false ((cnt) > cur)) \
299 newcnt = array_roundsize (type, newcnt << 1); \
301 while ((cnt) > newcnt); \
303 base = (type *)ev_realloc (base, sizeof (type) * (newcnt));\
304 init (base + cur, newcnt - cur); \
308 #define array_slim(type,stem) \
309 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
311 stem ## max = array_roundsize (stem ## cnt >> 1); \
312 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
313 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
316 /* microsoft's pseudo-c is quite far from C as the rest of the world and the standard knows it */
317 /* bringing us everlasting joy in form of stupid extra macros that are not required in C */
318 #define array_free_microshit(stem) \
319 ev_free (stem ## s); stem ## cnt = stem ## max = 0;
321 #define array_free(stem, idx) \
322 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
324 /*****************************************************************************/
327 anfds_init (ANFD *base, int count)
332 base->events = EV_NONE;
340 ev_feed_event (EV_P_ void *w, int revents)
346 pendings [ABSPRI (w_)][w_->pending - 1].events |= revents;
350 w_->pending = ++pendingcnt [ABSPRI (w_)];
351 array_needsize (ANPENDING, pendings [ABSPRI (w_)], pendingmax [ABSPRI (w_)], pendingcnt [ABSPRI (w_)], (void));
352 pendings [ABSPRI (w_)][w_->pending - 1].w = w_;
353 pendings [ABSPRI (w_)][w_->pending - 1].events = revents;
357 queue_events (EV_P_ W *events, int eventcnt, int type)
361 for (i = 0; i < eventcnt; ++i)
362 ev_feed_event (EV_A_ events [i], type);
366 fd_event (EV_P_ int fd, int revents)
368 ANFD *anfd = anfds + fd;
371 for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
373 int ev = w->events & revents;
376 ev_feed_event (EV_A_ (W)w, ev);
381 ev_feed_fd_event (EV_P_ int fd, int revents)
383 fd_event (EV_A_ fd, revents);
386 /*****************************************************************************/
393 for (i = 0; i < fdchangecnt; ++i)
395 int fd = fdchanges [i];
396 ANFD *anfd = anfds + fd;
401 for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
406 method_modify (EV_A_ fd, anfd->events, events);
407 anfd->events = events;
414 fd_change (EV_P_ int fd)
416 if (anfds [fd].reify)
419 anfds [fd].reify = 1;
422 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, (void));
423 fdchanges [fdchangecnt - 1] = fd;
427 fd_kill (EV_P_ int fd)
431 while ((w = (struct ev_io *)anfds [fd].head))
433 ev_io_stop (EV_A_ w);
434 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
442 return !!win32_get_osfhandle (fd);
444 return fcntl (fd, F_GETFD) != -1;
448 /* called on EBADF to verify fds */
454 for (fd = 0; fd < anfdmax; ++fd)
455 if (anfds [fd].events)
456 if (!fd_valid (fd) == -1 && errno == EBADF)
460 /* called on ENOMEM in select/poll to kill some fds and retry */
466 for (fd = anfdmax; fd--; )
467 if (anfds [fd].events)
474 /* usually called after fork if method needs to re-arm all fds from scratch */
480 /* this should be highly optimised to not do anything but set a flag */
481 for (fd = 0; fd < anfdmax; ++fd)
482 if (anfds [fd].events)
484 anfds [fd].events = 0;
485 fd_change (EV_A_ fd);
489 /*****************************************************************************/
492 upheap (WT *heap, int k)
496 while (k && heap [k >> 1]->at > w->at)
498 heap [k] = heap [k >> 1];
499 ((W)heap [k])->active = k + 1;
504 ((W)heap [k])->active = k + 1;
509 downheap (WT *heap, int N, int k)
517 if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
520 if (w->at <= heap [j]->at)
524 ((W)heap [k])->active = k + 1;
529 ((W)heap [k])->active = k + 1;
533 adjustheap (WT *heap, int N, int k, ev_tstamp at)
535 ev_tstamp old_at = heap [k]->at;
539 downheap (heap, N, k);
544 /*****************************************************************************/
549 sig_atomic_t volatile gotsig;
552 static ANSIG *signals;
553 static int signalmax;
555 static int sigpipe [2];
556 static sig_atomic_t volatile gotsig;
557 static struct ev_io sigev;
560 signals_init (ANSIG *base, int count)
572 sighandler (int signum)
575 signal (signum, sighandler);
578 signals [signum - 1].gotsig = 1;
582 int old_errno = errno;
585 send (sigpipe [1], &signum, 1, MSG_DONTWAIT);
587 write (sigpipe [1], &signum, 1);
594 ev_feed_signal_event (EV_P_ int signum)
599 assert (("feeding signal events is only supported in the default loop", loop == default_loop));
604 if (signum < 0 || signum >= signalmax)
607 signals [signum].gotsig = 0;
609 for (w = signals [signum].head; w; w = w->next)
610 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
614 sigcb (EV_P_ struct ev_io *iow, int revents)
619 recv (sigpipe [0], &revents, 1, MSG_DONTWAIT);
621 read (sigpipe [0], &revents, 1);
625 for (signum = signalmax; signum--; )
626 if (signals [signum].gotsig)
627 ev_feed_signal_event (EV_A_ signum + 1);
634 fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
635 fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
637 /* rather than sort out wether we really need nb, set it */
638 fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
639 fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
642 ev_io_set (&sigev, sigpipe [0], EV_READ);
643 ev_io_start (EV_A_ &sigev);
644 ev_unref (EV_A); /* child watcher should not keep loop alive */
647 /*****************************************************************************/
649 static struct ev_child *childs [PID_HASHSIZE];
653 static struct ev_signal childev;
656 # define WCONTINUED 0
660 child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
664 for (w = (struct ev_child *)childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child *)((WL)w)->next)
665 if (w->pid == pid || !w->pid)
667 ev_priority (w) = ev_priority (sw); /* need to do it *now* */
670 ev_feed_event (EV_A_ (W)w, EV_CHILD);
675 childcb (EV_P_ struct ev_signal *sw, int revents)
679 if (0 < (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
681 /* make sure we are called again until all childs have been reaped */
682 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
684 child_reap (EV_A_ sw, pid, pid, status);
685 child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but event catches that */
691 /*****************************************************************************/
694 # include "ev_kqueue.c"
697 # include "ev_epoll.c"
700 # include "ev_poll.c"
703 # include "ev_select.c"
707 ev_version_major (void)
709 return EV_VERSION_MAJOR;
713 ev_version_minor (void)
715 return EV_VERSION_MINOR;
718 /* return true if we are running with elevated privileges and should ignore env variables */
725 return getuid () != geteuid ()
726 || getgid () != getegid ();
737 loop_init (EV_P_ int methods)
744 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
749 ev_rt_now = ev_time ();
750 mn_now = get_clock ();
752 rtmn_diff = ev_rt_now - mn_now;
754 if (methods == EVMETHOD_AUTO)
755 if (!enable_secure () && getenv ("LIBEV_METHODS"))
756 methods = atoi (getenv ("LIBEV_METHODS"));
758 methods = EVMETHOD_ANY;
762 if (!method && (methods & EVMETHOD_WIN32 )) method = win32_init (EV_A_ methods);
765 if (!method && (methods & EVMETHOD_KQUEUE)) method = kqueue_init (EV_A_ methods);
768 if (!method && (methods & EVMETHOD_EPOLL )) method = epoll_init (EV_A_ methods);
771 if (!method && (methods & EVMETHOD_POLL )) method = poll_init (EV_A_ methods);
774 if (!method && (methods & EVMETHOD_SELECT)) method = select_init (EV_A_ methods);
777 ev_init (&sigev, sigcb);
778 ev_set_priority (&sigev, EV_MAXPRI);
788 if (method == EVMETHOD_WIN32 ) win32_destroy (EV_A);
791 if (method == EVMETHOD_KQUEUE) kqueue_destroy (EV_A);
794 if (method == EVMETHOD_EPOLL ) epoll_destroy (EV_A);
797 if (method == EVMETHOD_POLL ) poll_destroy (EV_A);
800 if (method == EVMETHOD_SELECT) select_destroy (EV_A);
803 for (i = NUMPRI; i--; )
804 array_free (pending, [i]);
806 /* have to use the microsoft-never-gets-it-right macro */
807 array_free_microshit (fdchange);
808 array_free_microshit (timer);
810 array_free_microshit (periodic);
812 array_free_microshit (idle);
813 array_free_microshit (prepare);
814 array_free_microshit (check);
823 if (method == EVMETHOD_EPOLL ) epoll_fork (EV_A);
826 if (method == EVMETHOD_KQUEUE) kqueue_fork (EV_A);
829 if (ev_is_active (&sigev))
834 ev_io_stop (EV_A_ &sigev);
838 while (pipe (sigpipe))
839 syserr ("(libev) error creating pipe");
849 ev_loop_new (int methods)
851 struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
853 memset (loop, 0, sizeof (struct ev_loop));
855 loop_init (EV_A_ methods);
857 if (ev_method (EV_A))
864 ev_loop_destroy (EV_P)
883 ev_default_loop (int methods)
885 if (sigpipe [0] == sigpipe [1])
892 struct ev_loop *loop = default_loop = &default_loop_struct;
897 loop_init (EV_A_ methods);
899 if (ev_method (EV_A))
904 ev_signal_init (&childev, childcb, SIGCHLD);
905 ev_set_priority (&childev, EV_MAXPRI);
906 ev_signal_start (EV_A_ &childev);
907 ev_unref (EV_A); /* child watcher should not keep loop alive */
918 ev_default_destroy (void)
921 struct ev_loop *loop = default_loop;
925 ev_ref (EV_A); /* child watcher */
926 ev_signal_stop (EV_A_ &childev);
929 ev_ref (EV_A); /* signal watcher */
930 ev_io_stop (EV_A_ &sigev);
932 close (sigpipe [0]); sigpipe [0] = 0;
933 close (sigpipe [1]); sigpipe [1] = 0;
939 ev_default_fork (void)
942 struct ev_loop *loop = default_loop;
949 /*****************************************************************************/
956 for (pri = NUMPRI; pri--; )
957 if (pendingcnt [pri])
968 for (pri = NUMPRI; pri--; )
969 while (pendingcnt [pri])
971 ANPENDING *p = pendings [pri] + --pendingcnt [pri];
976 EV_CB_INVOKE (p->w, p->events);
984 while (timercnt && ((WT)timers [0])->at <= mn_now)
986 struct ev_timer *w = timers [0];
988 assert (("inactive timer on timer heap detected", ev_is_active (w)));
990 /* first reschedule or stop timer */
993 assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
995 ((WT)w)->at += w->repeat;
996 if (((WT)w)->at < mn_now)
997 ((WT)w)->at = mn_now;
999 downheap ((WT *)timers, timercnt, 0);
1002 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
1004 ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
1010 periodics_reify (EV_P)
1012 while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
1014 struct ev_periodic *w = periodics [0];
1016 assert (("inactive timer on periodic heap detected", ev_is_active (w)));
1018 /* first reschedule or stop timer */
1019 if (w->reschedule_cb)
1021 ev_tstamp at = ((WT)w)->at = w->reschedule_cb (w, ev_rt_now + 0.0001);
1023 assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
1024 downheap ((WT *)periodics, periodiccnt, 0);
1026 else if (w->interval)
1028 ((WT)w)->at += floor ((ev_rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
1029 assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
1030 downheap ((WT *)periodics, periodiccnt, 0);
1033 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
1035 ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
1040 periodics_reschedule (EV_P)
1044 /* adjust periodics after time jump */
1045 for (i = 0; i < periodiccnt; ++i)
1047 struct ev_periodic *w = periodics [i];
1049 if (w->reschedule_cb)
1050 ((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
1051 else if (w->interval)
1052 ((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
1055 /* now rebuild the heap */
1056 for (i = periodiccnt >> 1; i--; )
1057 downheap ((WT *)periodics, periodiccnt, i);
1062 time_update_monotonic (EV_P)
1064 mn_now = get_clock ();
1066 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
1068 ev_rt_now = rtmn_diff + mn_now;
1074 ev_rt_now = ev_time ();
1084 #if EV_USE_MONOTONIC
1085 if (expect_true (have_monotonic))
1087 if (time_update_monotonic (EV_A))
1089 ev_tstamp odiff = rtmn_diff;
1091 for (i = 4; --i; ) /* loop a few times, before making important decisions */
1093 rtmn_diff = ev_rt_now - mn_now;
1095 if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
1096 return; /* all is well */
1098 ev_rt_now = ev_time ();
1099 mn_now = get_clock ();
1104 periodics_reschedule (EV_A);
1106 /* no timer adjustment, as the monotonic clock doesn't jump */
1107 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
1113 ev_rt_now = ev_time ();
1115 if (expect_false (mn_now > ev_rt_now || mn_now < ev_rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
1118 periodics_reschedule (EV_A);
1121 /* adjust timers. this is easy, as the offset is the same for all */
1122 for (i = 0; i < timercnt; ++i)
1123 ((WT)timers [i])->at += ev_rt_now - mn_now;
1142 static int loop_done;
1145 ev_loop (EV_P_ int flags)
1148 loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
1152 /* queue check watchers (and execute them) */
1153 if (expect_false (preparecnt))
1155 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
1156 call_pending (EV_A);
1159 /* we might have forked, so reify kernel state if necessary */
1160 if (expect_false (postfork))
1163 /* update fd-related kernel structures */
1166 /* calculate blocking time */
1168 /* we only need this for !monotonic clock or timers, but as we basically
1169 always have timers, we just calculate it always */
1170 #if EV_USE_MONOTONIC
1171 if (expect_true (have_monotonic))
1172 time_update_monotonic (EV_A);
1176 ev_rt_now = ev_time ();
1180 if (flags & EVLOOP_NONBLOCK || idlecnt)
1184 block = MAX_BLOCKTIME;
1188 ev_tstamp to = ((WT)timers [0])->at - mn_now + method_fudge;
1189 if (block > to) block = to;
1195 ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + method_fudge;
1196 if (block > to) block = to;
1200 if (block < 0.) block = 0.;
1203 method_poll (EV_A_ block);
1205 /* update ev_rt_now, do magic */
1208 /* queue pending timers and reschedule them */
1209 timers_reify (EV_A); /* relative timers called last */
1211 periodics_reify (EV_A); /* absolute timers called first */
1214 /* queue idle watchers unless io or timers are pending */
1215 if (idlecnt && !any_pending (EV_A))
1216 queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
1218 /* queue check watchers, to be executed first */
1220 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
1222 call_pending (EV_A);
1224 while (activecnt && !loop_done);
1231 ev_unloop (EV_P_ int how)
1236 /*****************************************************************************/
1239 wlist_add (WL *head, WL elem)
1246 wlist_del (WL *head, WL elem)
1256 head = &(*head)->next;
1261 ev_clear_pending (EV_P_ W w)
1265 pendings [ABSPRI (w)][w->pending - 1].w = 0;
1271 ev_start (EV_P_ W w, int active)
1273 if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
1274 if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
1287 /*****************************************************************************/
1290 ev_io_start (EV_P_ struct ev_io *w)
1294 if (ev_is_active (w))
1297 assert (("ev_io_start called with negative fd", fd >= 0));
1299 ev_start (EV_A_ (W)w, 1);
1300 array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
1301 wlist_add ((WL *)&anfds[fd].head, (WL)w);
1303 fd_change (EV_A_ fd);
1307 ev_io_stop (EV_P_ struct ev_io *w)
1309 ev_clear_pending (EV_A_ (W)w);
1310 if (!ev_is_active (w))
1313 assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
1315 wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
1316 ev_stop (EV_A_ (W)w);
1318 fd_change (EV_A_ w->fd);
1322 ev_timer_start (EV_P_ struct ev_timer *w)
1324 if (ev_is_active (w))
1327 ((WT)w)->at += mn_now;
1329 assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
1331 ev_start (EV_A_ (W)w, ++timercnt);
1332 array_needsize (struct ev_timer *, timers, timermax, timercnt, (void));
1333 timers [timercnt - 1] = w;
1334 upheap ((WT *)timers, timercnt - 1);
1336 assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
1340 ev_timer_stop (EV_P_ struct ev_timer *w)
1342 ev_clear_pending (EV_A_ (W)w);
1343 if (!ev_is_active (w))
1346 assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
1348 if (((W)w)->active < timercnt--)
1350 timers [((W)w)->active - 1] = timers [timercnt];
1351 downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
1354 ((WT)w)->at -= mn_now;
1356 ev_stop (EV_A_ (W)w);
1360 ev_timer_again (EV_P_ struct ev_timer *w)
1362 if (ev_is_active (w))
1365 adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1, mn_now + w->repeat);
1367 ev_timer_stop (EV_A_ w);
1370 ev_timer_start (EV_A_ w);
1375 ev_periodic_start (EV_P_ struct ev_periodic *w)
1377 if (ev_is_active (w))
1380 if (w->reschedule_cb)
1381 ((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
1382 else if (w->interval)
1384 assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
1385 /* this formula differs from the one in periodic_reify because we do not always round up */
1386 ((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
1389 ev_start (EV_A_ (W)w, ++periodiccnt);
1390 array_needsize (struct ev_periodic *, periodics, periodicmax, periodiccnt, (void));
1391 periodics [periodiccnt - 1] = w;
1392 upheap ((WT *)periodics, periodiccnt - 1);
1394 assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
1398 ev_periodic_stop (EV_P_ struct ev_periodic *w)
1400 ev_clear_pending (EV_A_ (W)w);
1401 if (!ev_is_active (w))
1404 assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
1406 if (((W)w)->active < periodiccnt--)
1408 periodics [((W)w)->active - 1] = periodics [periodiccnt];
1409 downheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
1412 ev_stop (EV_A_ (W)w);
1416 ev_periodic_again (EV_P_ struct ev_periodic *w)
1418 /* TODO: use adjustheap and recalculation */
1419 ev_periodic_stop (EV_A_ w);
1420 ev_periodic_start (EV_A_ w);
1425 ev_idle_start (EV_P_ struct ev_idle *w)
1427 if (ev_is_active (w))
1430 ev_start (EV_A_ (W)w, ++idlecnt);
1431 array_needsize (struct ev_idle *, idles, idlemax, idlecnt, (void));
1432 idles [idlecnt - 1] = w;
1436 ev_idle_stop (EV_P_ struct ev_idle *w)
1438 ev_clear_pending (EV_A_ (W)w);
1439 if (ev_is_active (w))
1442 idles [((W)w)->active - 1] = idles [--idlecnt];
1443 ev_stop (EV_A_ (W)w);
1447 ev_prepare_start (EV_P_ struct ev_prepare *w)
1449 if (ev_is_active (w))
1452 ev_start (EV_A_ (W)w, ++preparecnt);
1453 array_needsize (struct ev_prepare *, prepares, preparemax, preparecnt, (void));
1454 prepares [preparecnt - 1] = w;
1458 ev_prepare_stop (EV_P_ struct ev_prepare *w)
1460 ev_clear_pending (EV_A_ (W)w);
1461 if (ev_is_active (w))
1464 prepares [((W)w)->active - 1] = prepares [--preparecnt];
1465 ev_stop (EV_A_ (W)w);
1469 ev_check_start (EV_P_ struct ev_check *w)
1471 if (ev_is_active (w))
1474 ev_start (EV_A_ (W)w, ++checkcnt);
1475 array_needsize (struct ev_check *, checks, checkmax, checkcnt, (void));
1476 checks [checkcnt - 1] = w;
1480 ev_check_stop (EV_P_ struct ev_check *w)
1482 ev_clear_pending (EV_A_ (W)w);
1483 if (!ev_is_active (w))
1486 checks [((W)w)->active - 1] = checks [--checkcnt];
1487 ev_stop (EV_A_ (W)w);
1491 # define SA_RESTART 0
1495 ev_signal_start (EV_P_ struct ev_signal *w)
1498 assert (("signal watchers are only supported in the default loop", loop == default_loop));
1500 if (ev_is_active (w))
1503 assert (("ev_signal_start called with illegal signal number", w->signum > 0));
1505 ev_start (EV_A_ (W)w, 1);
1506 array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
1507 wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
1512 signal (w->signum, sighandler);
1514 struct sigaction sa;
1515 sa.sa_handler = sighandler;
1516 sigfillset (&sa.sa_mask);
1517 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
1518 sigaction (w->signum, &sa, 0);
1524 ev_signal_stop (EV_P_ struct ev_signal *w)
1526 ev_clear_pending (EV_A_ (W)w);
1527 if (!ev_is_active (w))
1530 wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
1531 ev_stop (EV_A_ (W)w);
1533 if (!signals [w->signum - 1].head)
1534 signal (w->signum, SIG_DFL);
1538 ev_child_start (EV_P_ struct ev_child *w)
1541 assert (("child watchers are only supported in the default loop", loop == default_loop));
1543 if (ev_is_active (w))
1546 ev_start (EV_A_ (W)w, 1);
1547 wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
1551 ev_child_stop (EV_P_ struct ev_child *w)
1553 ev_clear_pending (EV_A_ (W)w);
1554 if (!ev_is_active (w))
1557 wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
1558 ev_stop (EV_A_ (W)w);
1561 /*****************************************************************************/
1567 void (*cb)(int revents, void *arg);
1572 once_cb (EV_P_ struct ev_once *once, int revents)
1574 void (*cb)(int revents, void *arg) = once->cb;
1575 void *arg = once->arg;
1577 ev_io_stop (EV_A_ &once->io);
1578 ev_timer_stop (EV_A_ &once->to);
1585 once_cb_io (EV_P_ struct ev_io *w, int revents)
1587 once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
1591 once_cb_to (EV_P_ struct ev_timer *w, int revents)
1593 once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
1597 ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
1599 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
1602 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
1608 ev_init (&once->io, once_cb_io);
1611 ev_io_set (&once->io, fd, events);
1612 ev_io_start (EV_A_ &once->io);
1615 ev_init (&once->to, once_cb_to);
1618 ev_timer_set (&once->to, timeout, 0.);
1619 ev_timer_start (EV_A_ &once->to);