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Comparing libev/ev.c (file contents):
Revision 1.195 by root, Sat Dec 22 11:44:51 2007 UTC vs.
Revision 1.208 by root, Fri Feb 1 13:22:48 2008 UTC

1/* 1/*
2 * libev event processing core, watcher management 2 * libev event processing core, watcher management
3 * 3 *
4 * Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de> 4 * Copyright (c) 2007,2008 Marc Alexander Lehmann <libev@schmorp.de>
5 * All rights reserved. 5 * All rights reserved.
6 * 6 *
7 * Redistribution and use in source and binary forms, with or without 7 * Redistribution and use in source and binary forms, with or without modifica-
8 * modification, are permitted provided that the following conditions are 8 * tion, are permitted provided that the following conditions are met:
9 * met: 9 *
10 * 1. Redistributions of source code must retain the above copyright notice,
11 * this list of conditions and the following disclaimer.
12 *
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.
16 *
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.
10 * 27 *
11 * * Redistributions of source code must retain the above copyright 28 * Alternatively, the contents of this file may be used under the terms of
12 * notice, this list of conditions and the following disclaimer. 29 * the GNU General Public License ("GPL") version 2 or any later version,
13 * 30 * in which case the provisions of the GPL are applicable instead of
14 * * Redistributions in binary form must reproduce the above 31 * the above. If you wish to allow the use of your version of this file
15 * copyright notice, this list of conditions and the following 32 * only under the terms of the GPL and not to allow others to use your
16 * disclaimer in the documentation and/or other materials provided 33 * version of this file under the BSD license, indicate your decision
17 * with the distribution. 34 * by deleting the provisions above and replace them with the notice
18 * 35 * and other provisions required by the GPL. If you do not delete the
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 36 * provisions above, a recipient may use your version of this file under
20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 37 * either the BSD or the GPL.
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.
30 */ 38 */
31 39
32#ifdef __cplusplus 40#ifdef __cplusplus
33extern "C" { 41extern "C" {
34#endif 42#endif
… …
280 288
281typedef ev_watcher *W; 289typedef ev_watcher *W;
282typedef ev_watcher_list *WL; 290typedef ev_watcher_list *WL;
283typedef ev_watcher_time *WT; 291typedef ev_watcher_time *WT;
284 292
293#if EV_USE_MONOTONIC
285/* sig_atomic_t is used to avoid per-thread variables or locking but still */ 294/* sig_atomic_t is used to avoid per-thread variables or locking but still */
286/* giving it a reasonably high chance of working on typical architetcures */ 295/* giving it a reasonably high chance of working on typical architetcures */
287static sig_atomic_t have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */ 296static EV_ATOMIC_T have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
297#endif
288 298
289#ifdef _WIN32 299#ifdef _WIN32
290# include "ev_win32.c" 300# include "ev_win32.c"
291#endif 301#endif
292 302
… …
590 600
591#if EV_SELECT_IS_WINSOCKET 601#if EV_SELECT_IS_WINSOCKET
592 if (events) 602 if (events)
593 { 603 {
594 unsigned long argp; 604 unsigned long argp;
605 #ifdef EV_FD_TO_WIN32_HANDLE
606 anfd->handle = EV_FD_TO_WIN32_HANDLE (fd);
607 #else
595 anfd->handle = _get_osfhandle (fd); 608 anfd->handle = _get_osfhandle (fd);
609 #endif
596 assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &argp) == 0)); 610 assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &argp) == 0));
597 } 611 }
598#endif 612#endif
599 613
600 { 614 {
… …
749/*****************************************************************************/ 763/*****************************************************************************/
750 764
751typedef struct 765typedef struct
752{ 766{
753 WL head; 767 WL head;
754 sig_atomic_t volatile gotsig; 768 EV_ATOMIC_T gotsig;
755} ANSIG; 769} ANSIG;
756 770
757static ANSIG *signals; 771static ANSIG *signals;
758static int signalmax; 772static int signalmax;
759 773
760static int sigpipe [2]; 774static EV_ATOMIC_T gotsig;
761static sig_atomic_t volatile gotsig;
762static ev_io sigev;
763 775
764void inline_size 776void inline_size
765signals_init (ANSIG *base, int count) 777signals_init (ANSIG *base, int count)
766{ 778{
767 while (count--) 779 while (count--)
… …
771 783
772 ++base; 784 ++base;
773 } 785 }
774} 786}
775 787
776static void 788/*****************************************************************************/
777sighandler (int signum)
778{
779#if _WIN32
780 signal (signum, sighandler);
781#endif
782
783 signals [signum - 1].gotsig = 1;
784
785 if (!gotsig)
786 {
787 int old_errno = errno;
788 gotsig = 1;
789 write (sigpipe [1], &signum, 1);
790 errno = old_errno;
791 }
792}
793
794void noinline
795ev_feed_signal_event (EV_P_ int signum)
796{
797 WL w;
798
799#if EV_MULTIPLICITY
800 assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
801#endif
802
803 --signum;
804
805 if (signum < 0 || signum >= signalmax)
806 return;
807
808 signals [signum].gotsig = 0;
809
810 for (w = signals [signum].head; w; w = w->next)
811 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
812}
813
814static void
815sigcb (EV_P_ ev_io *iow, int revents)
816{
817 int signum;
818
819 read (sigpipe [0], &revents, 1);
820 gotsig = 0;
821
822 for (signum = signalmax; signum--; )
823 if (signals [signum].gotsig)
824 ev_feed_signal_event (EV_A_ signum + 1);
825}
826 789
827void inline_speed 790void inline_speed
828fd_intern (int fd) 791fd_intern (int fd)
829{ 792{
830#ifdef _WIN32 793#ifdef _WIN32
… …
835 fcntl (fd, F_SETFL, O_NONBLOCK); 798 fcntl (fd, F_SETFL, O_NONBLOCK);
836#endif 799#endif
837} 800}
838 801
839static void noinline 802static void noinline
840siginit (EV_P) 803evpipe_init (EV_P)
841{ 804{
805 if (!ev_is_active (&pipeev))
806 {
807 while (pipe (evpipe))
808 syserr ("(libev) error creating signal/async pipe");
809
842 fd_intern (sigpipe [0]); 810 fd_intern (evpipe [0]);
843 fd_intern (sigpipe [1]); 811 fd_intern (evpipe [1]);
844 812
845 ev_io_set (&sigev, sigpipe [0], EV_READ); 813 ev_io_set (&pipeev, evpipe [0], EV_READ);
846 ev_io_start (EV_A_ &sigev); 814 ev_io_start (EV_A_ &pipeev);
847 ev_unref (EV_A); /* child watcher should not keep loop alive */ 815 ev_unref (EV_A); /* child watcher should not keep loop alive */
816 }
817}
818
819void inline_size
820evpipe_write (EV_P_ int sig, int async)
821{
822 if (!(gotasync || gotsig))
823 {
824 int old_errno = errno;
825
826 if (sig) gotsig = 1;
827 if (async) gotasync = 1;
828
829 write (evpipe [1], &old_errno, 1);
830 errno = old_errno;
831 }
832}
833
834static void
835pipecb (EV_P_ ev_io *iow, int revents)
836{
837 {
838 int dummy;
839 read (evpipe [0], &dummy, 1);
840 }
841
842 if (gotsig)
843 {
844 int signum;
845 gotsig = 0;
846
847 for (signum = signalmax; signum--; )
848 if (signals [signum].gotsig)
849 ev_feed_signal_event (EV_A_ signum + 1);
850 }
851
852 if (gotasync)
853 {
854 int i;
855 gotasync = 0;
856
857 for (i = asynccnt; i--; )
858 if (asyncs [i]->sent)
859 {
860 asyncs [i]->sent = 0;
861 ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
862 }
863 }
848} 864}
849 865
850/*****************************************************************************/ 866/*****************************************************************************/
851 867
868static void
869sighandler (int signum)
870{
871#if EV_MULTIPLICITY
872 struct ev_loop *loop = &default_loop_struct;
873#endif
874
875#if _WIN32
876 signal (signum, sighandler);
877#endif
878
879 signals [signum - 1].gotsig = 1;
880 evpipe_write (EV_A_ 1, 0);
881}
882
883void noinline
884ev_feed_signal_event (EV_P_ int signum)
885{
886 WL w;
887
888#if EV_MULTIPLICITY
889 assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
890#endif
891
892 --signum;
893
894 if (signum < 0 || signum >= signalmax)
895 return;
896
897 signals [signum].gotsig = 0;
898
899 for (w = signals [signum].head; w; w = w->next)
900 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
901}
902
903/*****************************************************************************/
904
852static WL childs [EV_PID_HASHSIZE]; 905static WL childs [EV_PID_HASHSIZE];
853 906
854#ifndef _WIN32 907#ifndef _WIN32
855 908
856static ev_signal childev; 909static ev_signal childev;
910
911#ifndef WIFCONTINUED
912# define WIFCONTINUED(status) 0
913#endif
857 914
858void inline_speed 915void inline_speed
859child_reap (EV_P_ ev_signal *sw, int chain, int pid, int status) 916child_reap (EV_P_ ev_signal *sw, int chain, int pid, int status)
860{ 917{
861 ev_child *w; 918 ev_child *w;
919 int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
862 920
863 for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next) 921 for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
922 {
864 if (w->pid == pid || !w->pid) 923 if ((w->pid == pid || !w->pid)
924 && (!traced || (w->flags & 1)))
865 { 925 {
866 ev_set_priority (w, ev_priority (sw)); /* need to do it *now* */ 926 ev_set_priority (w, ev_priority (sw)); /* need to do it *now* */
867 w->rpid = pid; 927 w->rpid = pid;
868 w->rstatus = status; 928 w->rstatus = status;
869 ev_feed_event (EV_A_ (W)w, EV_CHILD); 929 ev_feed_event (EV_A_ (W)w, EV_CHILD);
870 } 930 }
931 }
871} 932}
872 933
873#ifndef WCONTINUED 934#ifndef WCONTINUED
874# define WCONTINUED 0 935# define WCONTINUED 0
875#endif 936#endif
… …
972} 1033}
973 1034
974unsigned int 1035unsigned int
975ev_embeddable_backends (void) 1036ev_embeddable_backends (void)
976{ 1037{
1038 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
1039
977 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */ 1040 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
978 return EVBACKEND_KQUEUE 1041 /* please fix it and tell me how to detect the fix */
979 | EVBACKEND_PORT; 1042 flags &= ~EVBACKEND_EPOLL;
1043
1044 return flags;
980} 1045}
981 1046
982unsigned int 1047unsigned int
983ev_backend (EV_P) 1048ev_backend (EV_P)
984{ 1049{
… …
1058#endif 1123#endif
1059#if EV_USE_SELECT 1124#if EV_USE_SELECT
1060 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags); 1125 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
1061#endif 1126#endif
1062 1127
1063 ev_init (&sigev, sigcb); 1128 ev_init (&pipeev, pipecb);
1064 ev_set_priority (&sigev, EV_MAXPRI); 1129 ev_set_priority (&pipeev, EV_MAXPRI);
1065 } 1130 }
1066} 1131}
1067 1132
1068static void noinline 1133static void noinline
1069loop_destroy (EV_P) 1134loop_destroy (EV_P)
1070{ 1135{
1071 int i; 1136 int i;
1137
1138 if (ev_is_active (&pipeev))
1139 {
1140 ev_ref (EV_A); /* signal watcher */
1141 ev_io_stop (EV_A_ &pipeev);
1142
1143 close (evpipe [0]); evpipe [0] = 0;
1144 close (evpipe [1]); evpipe [1] = 0;
1145 }
1072 1146
1073#if EV_USE_INOTIFY 1147#if EV_USE_INOTIFY
1074 if (fs_fd >= 0) 1148 if (fs_fd >= 0)
1075 close (fs_fd); 1149 close (fs_fd);
1076#endif 1150#endif
… …
1135#endif 1209#endif
1136#if EV_USE_INOTIFY 1210#if EV_USE_INOTIFY
1137 infy_fork (EV_A); 1211 infy_fork (EV_A);
1138#endif 1212#endif
1139 1213
1140 if (ev_is_active (&sigev)) 1214 if (ev_is_active (&pipeev))
1141 { 1215 {
1142 /* default loop */ 1216 /* this "locks" the handlers against writing to the pipe */
1217 gotsig = gotasync = 1;
1143 1218
1144 ev_ref (EV_A); 1219 ev_ref (EV_A);
1145 ev_io_stop (EV_A_ &sigev); 1220 ev_io_stop (EV_A_ &pipeev);
1146 close (sigpipe [0]); 1221 close (evpipe [0]);
1147 close (sigpipe [1]); 1222 close (evpipe [1]);
1148 1223
1149 while (pipe (sigpipe))
1150 syserr ("(libev) error creating pipe");
1151
1152 siginit (EV_A); 1224 evpipe_init (EV_A);
1225 /* now iterate over everything, in case we missed something */
1226 pipecb (EV_A_ &pipeev, EV_READ);
1153 } 1227 }
1154 1228
1155 postfork = 0; 1229 postfork = 0;
1156} 1230}
1157 1231
… …
1179} 1253}
1180 1254
1181void 1255void
1182ev_loop_fork (EV_P) 1256ev_loop_fork (EV_P)
1183{ 1257{
1184 postfork = 1; 1258 postfork = 1; /* must be in line with ev_default_fork */
1185} 1259}
1186 1260
1187#endif 1261#endif
1188 1262
1189#if EV_MULTIPLICITY 1263#if EV_MULTIPLICITY
… …
1192#else 1266#else
1193int 1267int
1194ev_default_loop (unsigned int flags) 1268ev_default_loop (unsigned int flags)
1195#endif 1269#endif
1196{ 1270{
1197 if (sigpipe [0] == sigpipe [1])
1198 if (pipe (sigpipe))
1199 return 0;
1200
1201 if (!ev_default_loop_ptr) 1271 if (!ev_default_loop_ptr)
1202 { 1272 {
1203#if EV_MULTIPLICITY 1273#if EV_MULTIPLICITY
1204 struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct; 1274 struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
1205#else 1275#else
… …
1208 1278
1209 loop_init (EV_A_ flags); 1279 loop_init (EV_A_ flags);
1210 1280
1211 if (ev_backend (EV_A)) 1281 if (ev_backend (EV_A))
1212 { 1282 {
1213 siginit (EV_A);
1214
1215#ifndef _WIN32 1283#ifndef _WIN32
1216 ev_signal_init (&childev, childcb, SIGCHLD); 1284 ev_signal_init (&childev, childcb, SIGCHLD);
1217 ev_set_priority (&childev, EV_MAXPRI); 1285 ev_set_priority (&childev, EV_MAXPRI);
1218 ev_signal_start (EV_A_ &childev); 1286 ev_signal_start (EV_A_ &childev);
1219 ev_unref (EV_A); /* child watcher should not keep loop alive */ 1287 ev_unref (EV_A); /* child watcher should not keep loop alive */
… …
1236#ifndef _WIN32 1304#ifndef _WIN32
1237 ev_ref (EV_A); /* child watcher */ 1305 ev_ref (EV_A); /* child watcher */
1238 ev_signal_stop (EV_A_ &childev); 1306 ev_signal_stop (EV_A_ &childev);
1239#endif 1307#endif
1240 1308
1241 ev_ref (EV_A); /* signal watcher */
1242 ev_io_stop (EV_A_ &sigev);
1243
1244 close (sigpipe [0]); sigpipe [0] = 0;
1245 close (sigpipe [1]); sigpipe [1] = 0;
1246
1247 loop_destroy (EV_A); 1309 loop_destroy (EV_A);
1248} 1310}
1249 1311
1250void 1312void
1251ev_default_fork (void) 1313ev_default_fork (void)
… …
1253#if EV_MULTIPLICITY 1315#if EV_MULTIPLICITY
1254 struct ev_loop *loop = ev_default_loop_ptr; 1316 struct ev_loop *loop = ev_default_loop_ptr;
1255#endif 1317#endif
1256 1318
1257 if (backend) 1319 if (backend)
1258 postfork = 1; 1320 postfork = 1; /* must be in line with ev_loop_fork */
1259} 1321}
1260 1322
1261/*****************************************************************************/ 1323/*****************************************************************************/
1262 1324
1263void 1325void
… …
1837#endif 1899#endif
1838 if (expect_false (ev_is_active (w))) 1900 if (expect_false (ev_is_active (w)))
1839 return; 1901 return;
1840 1902
1841 assert (("ev_signal_start called with illegal signal number", w->signum > 0)); 1903 assert (("ev_signal_start called with illegal signal number", w->signum > 0));
1904
1905 evpipe_init (EV_A);
1842 1906
1843 { 1907 {
1844#ifndef _WIN32 1908#ifndef _WIN32
1845 sigset_t full, prev; 1909 sigset_t full, prev;
1846 sigfillset (&full); 1910 sigfillset (&full);
… …
2360 2424
2361 ev_stop (EV_A_ (W)w); 2425 ev_stop (EV_A_ (W)w);
2362} 2426}
2363#endif 2427#endif
2364 2428
2429#if EV_ASYNC_ENABLE
2430void
2431ev_async_start (EV_P_ ev_async *w)
2432{
2433 if (expect_false (ev_is_active (w)))
2434 return;
2435
2436 evpipe_init (EV_A);
2437
2438 ev_start (EV_A_ (W)w, ++asynccnt);
2439 array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
2440 asyncs [asynccnt - 1] = w;
2441}
2442
2443void
2444ev_async_stop (EV_P_ ev_async *w)
2445{
2446 clear_pending (EV_A_ (W)w);
2447 if (expect_false (!ev_is_active (w)))
2448 return;
2449
2450 {
2451 int active = ((W)w)->active;
2452 asyncs [active - 1] = asyncs [--asynccnt];
2453 ((W)asyncs [active - 1])->active = active;
2454 }
2455
2456 ev_stop (EV_A_ (W)w);
2457}
2458
2459void
2460ev_async_send (EV_P_ ev_async *w)
2461{
2462 w->sent = 1;
2463 evpipe_write (EV_A_ 0, 1);
2464}
2465#endif
2466
2365/*****************************************************************************/ 2467/*****************************************************************************/
2366 2468
2367struct ev_once 2469struct ev_once
2368{ 2470{
2369 ev_io io; 2471 ev_io io;

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