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,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
29 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
43 # if HAVE_CLOCK_GETTIME
44 # ifndef EV_USE_MONOTONIC
45 # define EV_USE_MONOTONIC 1
47 # ifndef EV_USE_REALTIME
48 # define EV_USE_REALTIME 1
51 # ifndef EV_USE_MONOTONIC
52 # define EV_USE_MONOTONIC 0
54 # ifndef EV_USE_REALTIME
55 # define EV_USE_REALTIME 0
59 # ifndef EV_USE_SELECT
60 # if HAVE_SELECT && HAVE_SYS_SELECT_H
61 # define EV_USE_SELECT 1
63 # define EV_USE_SELECT 0
68 # if HAVE_POLL && HAVE_POLL_H
69 # define EV_USE_POLL 1
71 # define EV_USE_POLL 0
76 # if HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
77 # define EV_USE_EPOLL 1
79 # define EV_USE_EPOLL 0
83 # ifndef EV_USE_KQUEUE
84 # if HAVE_KQUEUE && HAVE_SYS_EVENT_H && HAVE_SYS_QUEUE_H
85 # define EV_USE_KQUEUE 1
87 # define EV_USE_KQUEUE 0
92 # if HAVE_PORT_H && HAVE_PORT_CREATE
93 # define EV_USE_PORT 1
95 # define EV_USE_PORT 0
99 # ifndef EV_USE_INOTIFY
100 # if HAVE_INOTIFY_INIT && HAVE_SYS_INOTIFY_H
101 # define EV_USE_INOTIFY 1
103 # define EV_USE_INOTIFY 0
118 #include <sys/types.h>
130 # include <sys/time.h>
131 # include <sys/wait.h>
134 # define WIN32_LEAN_AND_MEAN
135 # include <windows.h>
136 # ifndef EV_SELECT_IS_WINSOCKET
137 # define EV_SELECT_IS_WINSOCKET 1
143 #ifndef EV_USE_MONOTONIC
144 # define EV_USE_MONOTONIC 0
147 #ifndef EV_USE_REALTIME
148 # define EV_USE_REALTIME 0
151 #ifndef EV_USE_SELECT
152 # define EV_USE_SELECT 1
157 # define EV_USE_POLL 0
159 # define EV_USE_POLL 1
164 # define EV_USE_EPOLL 0
167 #ifndef EV_USE_KQUEUE
168 # define EV_USE_KQUEUE 0
172 # define EV_USE_PORT 0
175 #ifndef EV_USE_INOTIFY
176 # define EV_USE_INOTIFY 0
179 #ifndef EV_PID_HASHSIZE
181 # define EV_PID_HASHSIZE 1
183 # define EV_PID_HASHSIZE 16
187 #ifndef EV_INOTIFY_HASHSIZE
189 # define EV_INOTIFY_HASHSIZE 1
191 # define EV_INOTIFY_HASHSIZE 16
197 #ifndef CLOCK_MONOTONIC
198 # undef EV_USE_MONOTONIC
199 # define EV_USE_MONOTONIC 0
202 #ifndef CLOCK_REALTIME
203 # undef EV_USE_REALTIME
204 # define EV_USE_REALTIME 0
207 #if EV_SELECT_IS_WINSOCKET
208 # include <winsock.h>
212 # define EV_USE_INOTIFY 0
216 # include <sys/inotify.h>
222 * This is used to avoid floating point rounding problems.
223 * It is added to ev_rt_now when scheduling periodics
224 * to ensure progress, time-wise, even when rounding
225 * errors are against us.
226 * This value is good at least till the year 4000.
227 * Better solutions welcome.
229 #define TIME_EPSILON 0.0001220703125 /* 1/8192 */
231 #define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
232 #define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
233 /*#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds, TODO */
236 # define expect(expr,value) __builtin_expect ((expr),(value))
237 # define noinline __attribute__ ((noinline))
239 # define expect(expr,value) (expr)
241 # if __STDC_VERSION__ < 199901L
246 #define expect_false(expr) expect ((expr) != 0, 0)
247 #define expect_true(expr) expect ((expr) != 0, 1)
248 #define inline_size static inline
251 # define inline_speed static noinline
253 # define inline_speed static inline
256 #define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
257 #define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
259 #define EMPTY /* required for microsofts broken pseudo-c compiler */
260 #define EMPTY2(a,b) /* used to suppress some warnings */
262 typedef ev_watcher *W;
263 typedef ev_watcher_list *WL;
264 typedef ev_watcher_time *WT;
266 static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
269 # include "ev_win32.c"
272 /*****************************************************************************/
274 static void (*syserr_cb)(const char *msg);
277 ev_set_syserr_cb (void (*cb)(const char *msg))
283 syserr (const char *msg)
286 msg = "(libev) system error";
297 static void *(*alloc)(void *ptr, long size);
300 ev_set_allocator (void *(*cb)(void *ptr, long size))
306 ev_realloc (void *ptr, long size)
308 ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
312 fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
319 #define ev_malloc(size) ev_realloc (0, (size))
320 #define ev_free(ptr) ev_realloc ((ptr), 0)
322 /*****************************************************************************/
327 unsigned char events;
329 #if EV_SELECT_IS_WINSOCKET
352 #define ev_rt_now ((loop)->ev_rt_now)
353 #define VAR(name,decl) decl;
359 static struct ev_loop default_loop_struct;
360 struct ev_loop *ev_default_loop_ptr;
365 #define VAR(name,decl) static decl;
369 static int ev_default_loop_ptr;
373 /*****************************************************************************/
380 clock_gettime (CLOCK_REALTIME, &ts);
381 return ts.tv_sec + ts.tv_nsec * 1e-9;
384 gettimeofday (&tv, 0);
385 return tv.tv_sec + tv.tv_usec * 1e-6;
389 ev_tstamp inline_size
393 if (expect_true (have_monotonic))
396 clock_gettime (CLOCK_MONOTONIC, &ts);
397 return ts.tv_sec + ts.tv_nsec * 1e-9;
413 array_nextsize (int elem, int cur, int cnt)
421 /* if size > 4096, round to 4096 - 4 * longs to accomodate malloc overhead */
422 if (elem * ncur > 4096)
425 ncur = (ncur + elem + 4095 + sizeof (void *) * 4) & ~4095;
426 ncur = ncur - sizeof (void *) * 4;
433 static noinline void *
434 array_realloc (int elem, void *base, int *cur, int cnt)
436 *cur = array_nextsize (elem, *cur, cnt);
437 return ev_realloc (base, elem * *cur);
440 #define array_needsize(type,base,cur,cnt,init) \
441 if (expect_false ((cnt) > (cur))) \
444 (base) = (type *)array_realloc \
445 (sizeof (type), (base), &(cur), (cnt)); \
446 init ((base) + (ocur_), (cur) - ocur_); \
450 #define array_slim(type,stem) \
451 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
453 stem ## max = array_roundsize (stem ## cnt >> 1); \
454 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
455 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
459 #define array_free(stem, idx) \
460 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
462 /*****************************************************************************/
465 ev_feed_event (EV_P_ void *w, int revents)
468 int pri = ABSPRI (w_);
470 if (expect_false (w_->pending))
471 pendings [pri][w_->pending - 1].events |= revents;
474 w_->pending = ++pendingcnt [pri];
475 array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
476 pendings [pri][w_->pending - 1].w = w_;
477 pendings [pri][w_->pending - 1].events = revents;
482 queue_events (EV_P_ W *events, int eventcnt, int type)
486 for (i = 0; i < eventcnt; ++i)
487 ev_feed_event (EV_A_ events [i], type);
490 /*****************************************************************************/
493 anfds_init (ANFD *base, int count)
498 base->events = EV_NONE;
506 fd_event (EV_P_ int fd, int revents)
508 ANFD *anfd = anfds + fd;
511 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
513 int ev = w->events & revents;
516 ev_feed_event (EV_A_ (W)w, ev);
521 ev_feed_fd_event (EV_P_ int fd, int revents)
523 if (fd >= 0 && fd < anfdmax)
524 fd_event (EV_A_ fd, revents);
532 for (i = 0; i < fdchangecnt; ++i)
534 int fd = fdchanges [i];
535 ANFD *anfd = anfds + fd;
540 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
543 #if EV_SELECT_IS_WINSOCKET
547 anfd->handle = _get_osfhandle (fd);
548 assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &argp) == 0));
554 backend_modify (EV_A_ fd, anfd->events, events);
555 anfd->events = events;
562 fd_change (EV_P_ int fd, int flags)
564 unsigned char reify = anfds [fd].reify;
565 anfds [fd].reify |= flags | 1;
567 if (expect_true (!reify))
570 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
571 fdchanges [fdchangecnt - 1] = fd;
576 fd_kill (EV_P_ int fd)
580 while ((w = (ev_io *)anfds [fd].head))
582 ev_io_stop (EV_A_ w);
583 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
591 return _get_osfhandle (fd) != -1;
593 return fcntl (fd, F_GETFD) != -1;
597 /* called on EBADF to verify fds */
603 for (fd = 0; fd < anfdmax; ++fd)
604 if (anfds [fd].events)
605 if (!fd_valid (fd) == -1 && errno == EBADF)
609 /* called on ENOMEM in select/poll to kill some fds and retry */
615 for (fd = anfdmax; fd--; )
616 if (anfds [fd].events)
623 /* usually called after fork if backend needs to re-arm all fds from scratch */
629 for (fd = 0; fd < anfdmax; ++fd)
630 if (anfds [fd].events)
632 anfds [fd].events = 0;
633 fd_change (EV_A_ fd, EV_IOFDSET);
637 /*****************************************************************************/
640 upheap (WT *heap, int k)
646 int p = (k - 1) >> 1;
648 if (heap [p]->at <= w->at)
652 ((W)heap [k])->active = k + 1;
657 ((W)heap [k])->active = k + 1;
661 downheap (WT *heap, int N, int k)
667 int c = (k << 1) + 1;
672 c += c + 1 < N && heap [c]->at > heap [c + 1]->at
675 if (w->at <= heap [c]->at)
679 ((W)heap [k])->active = k + 1;
685 ((W)heap [k])->active = k + 1;
689 adjustheap (WT *heap, int N, int k)
692 downheap (heap, N, k);
695 /*****************************************************************************/
700 sig_atomic_t volatile gotsig;
703 static ANSIG *signals;
704 static int signalmax;
706 static int sigpipe [2];
707 static sig_atomic_t volatile gotsig;
711 signals_init (ANSIG *base, int count)
723 sighandler (int signum)
726 signal (signum, sighandler);
729 signals [signum - 1].gotsig = 1;
733 int old_errno = errno;
735 write (sigpipe [1], &signum, 1);
741 ev_feed_signal_event (EV_P_ int signum)
746 assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
751 if (signum < 0 || signum >= signalmax)
754 signals [signum].gotsig = 0;
756 for (w = signals [signum].head; w; w = w->next)
757 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
761 sigcb (EV_P_ ev_io *iow, int revents)
765 read (sigpipe [0], &revents, 1);
768 for (signum = signalmax; signum--; )
769 if (signals [signum].gotsig)
770 ev_feed_signal_event (EV_A_ signum + 1);
778 ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
780 fcntl (fd, F_SETFD, FD_CLOEXEC);
781 fcntl (fd, F_SETFL, O_NONBLOCK);
788 fd_intern (sigpipe [0]);
789 fd_intern (sigpipe [1]);
791 ev_io_set (&sigev, sigpipe [0], EV_READ);
792 ev_io_start (EV_A_ &sigev);
793 ev_unref (EV_A); /* child watcher should not keep loop alive */
796 /*****************************************************************************/
798 static WL childs [EV_PID_HASHSIZE];
802 static ev_signal childev;
805 child_reap (EV_P_ ev_signal *sw, int chain, int pid, int status)
809 for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
810 if (w->pid == pid || !w->pid)
812 ev_set_priority (w, ev_priority (sw)); /* need to do it *now* */
815 ev_feed_event (EV_A_ (W)w, EV_CHILD);
820 # define WCONTINUED 0
824 childcb (EV_P_ ev_signal *sw, int revents)
828 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
829 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
832 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
835 /* make sure we are called again until all childs have been reaped */
836 /* we need to do it this way so that the callback gets called before we continue */
837 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
839 child_reap (EV_A_ sw, pid, pid, status);
840 if (EV_PID_HASHSIZE > 1)
841 child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
846 /*****************************************************************************/
849 # include "ev_port.c"
852 # include "ev_kqueue.c"
855 # include "ev_epoll.c"
858 # include "ev_poll.c"
861 # include "ev_select.c"
865 ev_version_major (void)
867 return EV_VERSION_MAJOR;
871 ev_version_minor (void)
873 return EV_VERSION_MINOR;
876 /* return true if we are running with elevated privileges and should ignore env variables */
883 return getuid () != geteuid ()
884 || getgid () != getegid ();
889 ev_supported_backends (void)
891 unsigned int flags = 0;
893 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
894 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
895 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
896 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
897 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
903 ev_recommended_backends (void)
905 unsigned int flags = ev_supported_backends ();
908 /* kqueue is borked on everything but netbsd apparently */
909 /* it usually doesn't work correctly on anything but sockets and pipes */
910 flags &= ~EVBACKEND_KQUEUE;
913 // flags &= ~EVBACKEND_KQUEUE; for documentation
914 flags &= ~EVBACKEND_POLL;
921 ev_embeddable_backends (void)
923 return EVBACKEND_EPOLL
941 loop_init (EV_P_ unsigned int flags)
948 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
953 ev_rt_now = ev_time ();
954 mn_now = get_clock ();
956 rtmn_diff = ev_rt_now - mn_now;
958 /* pid check not overridable via env */
960 if (flags & EVFLAG_FORKCHECK)
964 if (!(flags & EVFLAG_NOENV)
966 && getenv ("LIBEV_FLAGS"))
967 flags = atoi (getenv ("LIBEV_FLAGS"));
969 if (!(flags & 0x0000ffffUL))
970 flags |= ev_recommended_backends ();
979 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
982 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
985 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
988 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
991 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
994 ev_init (&sigev, sigcb);
995 ev_set_priority (&sigev, EV_MAXPRI);
1009 if (backend_fd >= 0)
1013 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
1016 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
1019 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
1022 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
1025 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
1028 for (i = NUMPRI; i--; )
1030 array_free (pending, [i]);
1032 array_free (idle, [i]);
1036 /* have to use the microsoft-never-gets-it-right macro */
1037 array_free (fdchange, EMPTY);
1038 array_free (timer, EMPTY);
1039 #if EV_PERIODIC_ENABLE
1040 array_free (periodic, EMPTY);
1042 array_free (prepare, EMPTY);
1043 array_free (check, EMPTY);
1048 void inline_size infy_fork (EV_P);
1054 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
1057 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
1060 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
1066 if (ev_is_active (&sigev))
1071 ev_io_stop (EV_A_ &sigev);
1072 close (sigpipe [0]);
1073 close (sigpipe [1]);
1075 while (pipe (sigpipe))
1076 syserr ("(libev) error creating pipe");
1086 ev_loop_new (unsigned int flags)
1088 struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
1090 memset (loop, 0, sizeof (struct ev_loop));
1092 loop_init (EV_A_ flags);
1094 if (ev_backend (EV_A))
1101 ev_loop_destroy (EV_P)
1103 loop_destroy (EV_A);
1117 ev_default_loop_init (unsigned int flags)
1120 ev_default_loop (unsigned int flags)
1123 if (sigpipe [0] == sigpipe [1])
1127 if (!ev_default_loop_ptr)
1130 struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
1132 ev_default_loop_ptr = 1;
1135 loop_init (EV_A_ flags);
1137 if (ev_backend (EV_A))
1142 ev_signal_init (&childev, childcb, SIGCHLD);
1143 ev_set_priority (&childev, EV_MAXPRI);
1144 ev_signal_start (EV_A_ &childev);
1145 ev_unref (EV_A); /* child watcher should not keep loop alive */
1149 ev_default_loop_ptr = 0;
1152 return ev_default_loop_ptr;
1156 ev_default_destroy (void)
1159 struct ev_loop *loop = ev_default_loop_ptr;
1163 ev_ref (EV_A); /* child watcher */
1164 ev_signal_stop (EV_A_ &childev);
1167 ev_ref (EV_A); /* signal watcher */
1168 ev_io_stop (EV_A_ &sigev);
1170 close (sigpipe [0]); sigpipe [0] = 0;
1171 close (sigpipe [1]); sigpipe [1] = 0;
1173 loop_destroy (EV_A);
1177 ev_default_fork (void)
1180 struct ev_loop *loop = ev_default_loop_ptr;
1187 /*****************************************************************************/
1190 ev_invoke (EV_P_ void *w, int revents)
1192 EV_CB_INVOKE ((W)w, revents);
1200 for (pri = NUMPRI; pri--; )
1201 while (pendingcnt [pri])
1203 ANPENDING *p = pendings [pri] + --pendingcnt [pri];
1205 if (expect_true (p->w))
1207 /*assert (("non-pending watcher on pending list", p->w->pending));*/
1210 EV_CB_INVOKE (p->w, p->events);
1218 while (timercnt && ((WT)timers [0])->at <= mn_now)
1220 ev_timer *w = (ev_timer *)timers [0];
1222 /*assert (("inactive timer on timer heap detected", ev_is_active (w)));*/
1224 /* first reschedule or stop timer */
1227 assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
1229 ((WT)w)->at += w->repeat;
1230 if (((WT)w)->at < mn_now)
1231 ((WT)w)->at = mn_now;
1233 downheap (timers, timercnt, 0);
1236 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
1238 ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
1242 #if EV_PERIODIC_ENABLE
1244 periodics_reify (EV_P)
1246 while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
1248 ev_periodic *w = (ev_periodic *)periodics [0];
1250 /*assert (("inactive timer on periodic heap detected", ev_is_active (w)));*/
1252 /* first reschedule or stop timer */
1253 if (w->reschedule_cb)
1255 ((WT)w)->at = w->reschedule_cb (w, ev_rt_now + TIME_EPSILON);
1256 assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
1257 downheap (periodics, periodiccnt, 0);
1259 else if (w->interval)
1261 ((WT)w)->at = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
1262 if (((WT)w)->at - ev_rt_now <= TIME_EPSILON) ((WT)w)->at += w->interval;
1263 assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
1264 downheap (periodics, periodiccnt, 0);
1267 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
1269 ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
1273 static void noinline
1274 periodics_reschedule (EV_P)
1278 /* adjust periodics after time jump */
1279 for (i = 0; i < periodiccnt; ++i)
1281 ev_periodic *w = (ev_periodic *)periodics [i];
1283 if (w->reschedule_cb)
1284 ((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
1285 else if (w->interval)
1286 ((WT)w)->at = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
1289 /* now rebuild the heap */
1290 for (i = periodiccnt >> 1; i--; )
1291 downheap (periodics, periodiccnt, i);
1299 if (expect_false (idleall))
1303 for (pri = NUMPRI; pri--; )
1305 if (pendingcnt [pri])
1310 queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
1319 time_update (EV_P_ ev_tstamp max_block)
1323 #if EV_USE_MONOTONIC
1324 if (expect_true (have_monotonic))
1326 ev_tstamp odiff = rtmn_diff;
1328 mn_now = get_clock ();
1330 /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
1331 /* interpolate in the meantime */
1332 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
1334 ev_rt_now = rtmn_diff + mn_now;
1339 ev_rt_now = ev_time ();
1341 /* loop a few times, before making important decisions.
1342 * on the choice of "4": one iteration isn't enough,
1343 * in case we get preempted during the calls to
1344 * ev_time and get_clock. a second call is almost guaranteed
1345 * to succeed in that case, though. and looping a few more times
1346 * doesn't hurt either as we only do this on time-jumps or
1347 * in the unlikely event of having been preempted here.
1351 rtmn_diff = ev_rt_now - mn_now;
1353 if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
1354 return; /* all is well */
1356 ev_rt_now = ev_time ();
1357 mn_now = get_clock ();
1361 # if EV_PERIODIC_ENABLE
1362 periodics_reschedule (EV_A);
1364 /* no timer adjustment, as the monotonic clock doesn't jump */
1365 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
1370 ev_rt_now = ev_time ();
1372 if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
1374 #if EV_PERIODIC_ENABLE
1375 periodics_reschedule (EV_A);
1377 /* adjust timers. this is easy, as the offset is the same for all of them */
1378 for (i = 0; i < timercnt; ++i)
1379 ((WT)timers [i])->at += ev_rt_now - mn_now;
1398 static int loop_done;
1401 ev_loop (EV_P_ int flags)
1403 loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK)
1407 call_pending (EV_A); /* in case we recurse, ensure ordering stays nice and clean */
1412 if (expect_false (curpid)) /* penalise the forking check even more */
1413 if (expect_false (getpid () != curpid))
1421 /* we might have forked, so queue fork handlers */
1422 if (expect_false (postfork))
1425 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
1426 call_pending (EV_A);
1430 /* queue prepare watchers (and execute them) */
1431 if (expect_false (preparecnt))
1433 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
1434 call_pending (EV_A);
1437 if (expect_false (!activecnt))
1440 /* we might have forked, so reify kernel state if necessary */
1441 if (expect_false (postfork))
1444 /* update fd-related kernel structures */
1447 /* calculate blocking time */
1451 if (expect_false (flags & EVLOOP_NONBLOCK || idleall || !activecnt))
1452 block = 0.; /* do not block at all */
1455 /* update time to cancel out callback processing overhead */
1456 time_update (EV_A_ 1e100);
1458 block = MAX_BLOCKTIME;
1462 ev_tstamp to = ((WT)timers [0])->at - mn_now + backend_fudge;
1463 if (block > to) block = to;
1466 #if EV_PERIODIC_ENABLE
1469 ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + backend_fudge;
1470 if (block > to) block = to;
1474 if (expect_false (block < 0.)) block = 0.;
1478 backend_poll (EV_A_ block);
1480 /* update ev_rt_now, do magic */
1481 time_update (EV_A_ block);
1484 /* queue pending timers and reschedule them */
1485 timers_reify (EV_A); /* relative timers called last */
1486 #if EV_PERIODIC_ENABLE
1487 periodics_reify (EV_A); /* absolute timers called first */
1491 /* queue idle watchers unless other events are pending */
1495 /* queue check watchers, to be executed first */
1496 if (expect_false (checkcnt))
1497 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
1499 call_pending (EV_A);
1502 while (expect_true (activecnt && !loop_done));
1504 if (loop_done == EVUNLOOP_ONE)
1505 loop_done = EVUNLOOP_CANCEL;
1509 ev_unloop (EV_P_ int how)
1514 /*****************************************************************************/
1517 wlist_add (WL *head, WL elem)
1524 wlist_del (WL *head, WL elem)
1534 head = &(*head)->next;
1539 clear_pending (EV_P_ W w)
1543 pendings [ABSPRI (w)][w->pending - 1].w = 0;
1549 ev_clear_pending (EV_P_ void *w)
1552 int pending = w_->pending;
1554 if (expect_true (pending))
1556 ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
1566 pri_adjust (EV_P_ W w)
1568 int pri = w->priority;
1569 pri = pri < EV_MINPRI ? EV_MINPRI : pri;
1570 pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
1575 ev_start (EV_P_ W w, int active)
1577 pri_adjust (EV_A_ w);
1589 /*****************************************************************************/
1592 ev_io_start (EV_P_ ev_io *w)
1596 if (expect_false (ev_is_active (w)))
1599 assert (("ev_io_start called with negative fd", fd >= 0));
1601 ev_start (EV_A_ (W)w, 1);
1602 array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
1603 wlist_add (&anfds[fd].head, (WL)w);
1605 fd_change (EV_A_ fd, w->events & EV_IOFDSET);
1606 w->events &= ~ EV_IOFDSET;
1610 ev_io_stop (EV_P_ ev_io *w)
1612 clear_pending (EV_A_ (W)w);
1613 if (expect_false (!ev_is_active (w)))
1616 assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
1618 wlist_del (&anfds[w->fd].head, (WL)w);
1619 ev_stop (EV_A_ (W)w);
1621 fd_change (EV_A_ w->fd, 0);
1625 ev_timer_start (EV_P_ ev_timer *w)
1627 if (expect_false (ev_is_active (w)))
1630 ((WT)w)->at += mn_now;
1632 assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
1634 ev_start (EV_A_ (W)w, ++timercnt);
1635 array_needsize (WT, timers, timermax, timercnt, EMPTY2);
1636 timers [timercnt - 1] = (WT)w;
1637 upheap (timers, timercnt - 1);
1639 /*assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));*/
1643 ev_timer_stop (EV_P_ ev_timer *w)
1645 clear_pending (EV_A_ (W)w);
1646 if (expect_false (!ev_is_active (w)))
1649 assert (("internal timer heap corruption", timers [((W)w)->active - 1] == (WT)w));
1652 int active = ((W)w)->active;
1654 if (expect_true (--active < --timercnt))
1656 timers [active] = timers [timercnt];
1657 adjustheap (timers, timercnt, active);
1661 ((WT)w)->at -= mn_now;
1663 ev_stop (EV_A_ (W)w);
1667 ev_timer_again (EV_P_ ev_timer *w)
1669 if (ev_is_active (w))
1673 ((WT)w)->at = mn_now + w->repeat;
1674 adjustheap (timers, timercnt, ((W)w)->active - 1);
1677 ev_timer_stop (EV_A_ w);
1682 ev_timer_start (EV_A_ w);
1686 #if EV_PERIODIC_ENABLE
1688 ev_periodic_start (EV_P_ ev_periodic *w)
1690 if (expect_false (ev_is_active (w)))
1693 if (w->reschedule_cb)
1694 ((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
1695 else if (w->interval)
1697 assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
1698 /* this formula differs from the one in periodic_reify because we do not always round up */
1699 ((WT)w)->at = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
1702 ((WT)w)->at = w->offset;
1704 ev_start (EV_A_ (W)w, ++periodiccnt);
1705 array_needsize (WT, periodics, periodicmax, periodiccnt, EMPTY2);
1706 periodics [periodiccnt - 1] = (WT)w;
1707 upheap (periodics, periodiccnt - 1);
1709 /*assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));*/
1713 ev_periodic_stop (EV_P_ ev_periodic *w)
1715 clear_pending (EV_A_ (W)w);
1716 if (expect_false (!ev_is_active (w)))
1719 assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == (WT)w));
1722 int active = ((W)w)->active;
1724 if (expect_true (--active < --periodiccnt))
1726 periodics [active] = periodics [periodiccnt];
1727 adjustheap (periodics, periodiccnt, active);
1731 ev_stop (EV_A_ (W)w);
1735 ev_periodic_again (EV_P_ ev_periodic *w)
1737 /* TODO: use adjustheap and recalculation */
1738 ev_periodic_stop (EV_A_ w);
1739 ev_periodic_start (EV_A_ w);
1744 # define SA_RESTART 0
1748 ev_signal_start (EV_P_ ev_signal *w)
1751 assert (("signal watchers are only supported in the default loop", loop == ev_default_loop_ptr));
1753 if (expect_false (ev_is_active (w)))
1756 assert (("ev_signal_start called with illegal signal number", w->signum > 0));
1760 sigset_t full, prev;
1762 sigprocmask (SIG_SETMASK, &full, &prev);
1765 array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
1768 sigprocmask (SIG_SETMASK, &prev, 0);
1772 ev_start (EV_A_ (W)w, 1);
1773 wlist_add (&signals [w->signum - 1].head, (WL)w);
1778 signal (w->signum, sighandler);
1780 struct sigaction sa;
1781 sa.sa_handler = sighandler;
1782 sigfillset (&sa.sa_mask);
1783 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
1784 sigaction (w->signum, &sa, 0);
1790 ev_signal_stop (EV_P_ ev_signal *w)
1792 clear_pending (EV_A_ (W)w);
1793 if (expect_false (!ev_is_active (w)))
1796 wlist_del (&signals [w->signum - 1].head, (WL)w);
1797 ev_stop (EV_A_ (W)w);
1799 if (!signals [w->signum - 1].head)
1800 signal (w->signum, SIG_DFL);
1804 ev_child_start (EV_P_ ev_child *w)
1807 assert (("child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
1809 if (expect_false (ev_is_active (w)))
1812 ev_start (EV_A_ (W)w, 1);
1813 wlist_add (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
1817 ev_child_stop (EV_P_ ev_child *w)
1819 clear_pending (EV_A_ (W)w);
1820 if (expect_false (!ev_is_active (w)))
1823 wlist_del (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
1824 ev_stop (EV_A_ (W)w);
1831 # define lstat(a,b) _stati64 (a,b)
1834 #define DEF_STAT_INTERVAL 5.0074891
1835 #define MIN_STAT_INTERVAL 0.1074891
1837 static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
1840 # define EV_INOTIFY_BUFSIZE 8192
1842 static void noinline
1843 infy_add (EV_P_ ev_stat *w)
1845 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);
1849 ev_timer_start (EV_A_ &w->timer); /* this is not race-free, so we still need to recheck periodically */
1851 /* monitor some parent directory for speedup hints */
1852 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
1855 strcpy (path, w->path);
1859 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
1860 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
1862 char *pend = strrchr (path, '/');
1865 break; /* whoops, no '/', complain to your admin */
1868 w->wd = inotify_add_watch (fs_fd, path, mask);
1870 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
1874 ev_timer_stop (EV_A_ &w->timer); /* we can watch this in a race-free way */
1877 wlist_add (&fs_hash [w->wd & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
1880 static void noinline
1881 infy_del (EV_P_ ev_stat *w)
1890 slot = wd & (EV_INOTIFY_HASHSIZE - 1);
1891 wlist_del (&fs_hash [slot].head, (WL)w);
1893 /* remove this watcher, if others are watching it, they will rearm */
1894 inotify_rm_watch (fs_fd, wd);
1897 static void noinline
1898 infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
1901 /* overflow, need to check for all hahs slots */
1902 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
1903 infy_wd (EV_A_ slot, wd, ev);
1908 for (w_ = fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head; w_; )
1910 ev_stat *w = (ev_stat *)w_;
1911 w_ = w_->next; /* lets us remove this watcher and all before it */
1913 if (w->wd == wd || wd == -1)
1915 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
1918 infy_add (EV_A_ w); /* re-add, no matter what */
1921 stat_timer_cb (EV_A_ &w->timer, 0);
1928 infy_cb (EV_P_ ev_io *w, int revents)
1930 char buf [EV_INOTIFY_BUFSIZE];
1931 struct inotify_event *ev = (struct inotify_event *)buf;
1933 int len = read (fs_fd, buf, sizeof (buf));
1935 for (ofs = 0; ofs < len; ofs += sizeof (struct inotify_event) + ev->len)
1936 infy_wd (EV_A_ ev->wd, ev->wd, ev);
1945 fs_fd = inotify_init ();
1949 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
1950 ev_set_priority (&fs_w, EV_MAXPRI);
1951 ev_io_start (EV_A_ &fs_w);
1964 fs_fd = inotify_init ();
1966 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
1968 WL w_ = fs_hash [slot].head;
1969 fs_hash [slot].head = 0;
1973 ev_stat *w = (ev_stat *)w_;
1974 w_ = w_->next; /* lets us add this watcher */
1979 infy_add (EV_A_ w); /* re-add, no matter what */
1981 ev_timer_start (EV_A_ &w->timer);
1990 ev_stat_stat (EV_P_ ev_stat *w)
1992 if (lstat (w->path, &w->attr) < 0)
1993 w->attr.st_nlink = 0;
1994 else if (!w->attr.st_nlink)
1995 w->attr.st_nlink = 1;
1998 static void noinline
1999 stat_timer_cb (EV_P_ ev_timer *w_, int revents)
2001 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
2003 /* we copy this here each the time so that */
2004 /* prev has the old value when the callback gets invoked */
2006 ev_stat_stat (EV_A_ w);
2008 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
2010 w->prev.st_dev != w->attr.st_dev
2011 || w->prev.st_ino != w->attr.st_ino
2012 || w->prev.st_mode != w->attr.st_mode
2013 || w->prev.st_nlink != w->attr.st_nlink
2014 || w->prev.st_uid != w->attr.st_uid
2015 || w->prev.st_gid != w->attr.st_gid
2016 || w->prev.st_rdev != w->attr.st_rdev
2017 || w->prev.st_size != w->attr.st_size
2018 || w->prev.st_atime != w->attr.st_atime
2019 || w->prev.st_mtime != w->attr.st_mtime
2020 || w->prev.st_ctime != w->attr.st_ctime
2025 ev_stat_stat (EV_A_ w); /* avoid race... */
2028 ev_feed_event (EV_A_ w, EV_STAT);
2033 ev_stat_start (EV_P_ ev_stat *w)
2035 if (expect_false (ev_is_active (w)))
2038 /* since we use memcmp, we need to clear any padding data etc. */
2039 memset (&w->prev, 0, sizeof (ev_statdata));
2040 memset (&w->attr, 0, sizeof (ev_statdata));
2042 ev_stat_stat (EV_A_ w);
2044 if (w->interval < MIN_STAT_INTERVAL)
2045 w->interval = w->interval ? MIN_STAT_INTERVAL : DEF_STAT_INTERVAL;
2047 ev_timer_init (&w->timer, stat_timer_cb, w->interval, w->interval);
2048 ev_set_priority (&w->timer, ev_priority (w));
2057 ev_timer_start (EV_A_ &w->timer);
2059 ev_start (EV_A_ (W)w, 1);
2063 ev_stat_stop (EV_P_ ev_stat *w)
2065 clear_pending (EV_A_ (W)w);
2066 if (expect_false (!ev_is_active (w)))
2072 ev_timer_stop (EV_A_ &w->timer);
2074 ev_stop (EV_A_ (W)w);
2080 ev_idle_start (EV_P_ ev_idle *w)
2082 if (expect_false (ev_is_active (w)))
2085 pri_adjust (EV_A_ (W)w);
2088 int active = ++idlecnt [ABSPRI (w)];
2091 ev_start (EV_A_ (W)w, active);
2093 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
2094 idles [ABSPRI (w)][active - 1] = w;
2099 ev_idle_stop (EV_P_ ev_idle *w)
2101 clear_pending (EV_A_ (W)w);
2102 if (expect_false (!ev_is_active (w)))
2106 int active = ((W)w)->active;
2108 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
2109 ((W)idles [ABSPRI (w)][active - 1])->active = active;
2111 ev_stop (EV_A_ (W)w);
2118 ev_prepare_start (EV_P_ ev_prepare *w)
2120 if (expect_false (ev_is_active (w)))
2123 ev_start (EV_A_ (W)w, ++preparecnt);
2124 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
2125 prepares [preparecnt - 1] = w;
2129 ev_prepare_stop (EV_P_ ev_prepare *w)
2131 clear_pending (EV_A_ (W)w);
2132 if (expect_false (!ev_is_active (w)))
2136 int active = ((W)w)->active;
2137 prepares [active - 1] = prepares [--preparecnt];
2138 ((W)prepares [active - 1])->active = active;
2141 ev_stop (EV_A_ (W)w);
2145 ev_check_start (EV_P_ ev_check *w)
2147 if (expect_false (ev_is_active (w)))
2150 ev_start (EV_A_ (W)w, ++checkcnt);
2151 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
2152 checks [checkcnt - 1] = w;
2156 ev_check_stop (EV_P_ ev_check *w)
2158 clear_pending (EV_A_ (W)w);
2159 if (expect_false (!ev_is_active (w)))
2163 int active = ((W)w)->active;
2164 checks [active - 1] = checks [--checkcnt];
2165 ((W)checks [active - 1])->active = active;
2168 ev_stop (EV_A_ (W)w);
2173 ev_embed_sweep (EV_P_ ev_embed *w)
2175 ev_loop (w->loop, EVLOOP_NONBLOCK);
2179 embed_cb (EV_P_ ev_io *io, int revents)
2181 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
2184 ev_feed_event (EV_A_ (W)w, EV_EMBED);
2186 ev_embed_sweep (loop, w);
2190 ev_embed_start (EV_P_ ev_embed *w)
2192 if (expect_false (ev_is_active (w)))
2196 struct ev_loop *loop = w->loop;
2197 assert (("loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
2198 ev_io_init (&w->io, embed_cb, backend_fd, EV_READ);
2201 ev_set_priority (&w->io, ev_priority (w));
2202 ev_io_start (EV_A_ &w->io);
2204 ev_start (EV_A_ (W)w, 1);
2208 ev_embed_stop (EV_P_ ev_embed *w)
2210 clear_pending (EV_A_ (W)w);
2211 if (expect_false (!ev_is_active (w)))
2214 ev_io_stop (EV_A_ &w->io);
2216 ev_stop (EV_A_ (W)w);
2222 ev_fork_start (EV_P_ ev_fork *w)
2224 if (expect_false (ev_is_active (w)))
2227 ev_start (EV_A_ (W)w, ++forkcnt);
2228 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
2229 forks [forkcnt - 1] = w;
2233 ev_fork_stop (EV_P_ ev_fork *w)
2235 clear_pending (EV_A_ (W)w);
2236 if (expect_false (!ev_is_active (w)))
2240 int active = ((W)w)->active;
2241 forks [active - 1] = forks [--forkcnt];
2242 ((W)forks [active - 1])->active = active;
2245 ev_stop (EV_A_ (W)w);
2249 /*****************************************************************************/
2255 void (*cb)(int revents, void *arg);
2260 once_cb (EV_P_ struct ev_once *once, int revents)
2262 void (*cb)(int revents, void *arg) = once->cb;
2263 void *arg = once->arg;
2265 ev_io_stop (EV_A_ &once->io);
2266 ev_timer_stop (EV_A_ &once->to);
2273 once_cb_io (EV_P_ ev_io *w, int revents)
2275 once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
2279 once_cb_to (EV_P_ ev_timer *w, int revents)
2281 once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
2285 ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
2287 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
2289 if (expect_false (!once))
2291 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
2298 ev_init (&once->io, once_cb_io);
2301 ev_io_set (&once->io, fd, events);
2302 ev_io_start (EV_A_ &once->io);
2305 ev_init (&once->to, once_cb_to);
2308 ev_timer_set (&once->to, timeout, 0.);
2309 ev_timer_start (EV_A_ &once->to);