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Comparing libev/ev.c (file contents):
Revision 1.199 by root, Tue Dec 25 07:05:45 2007 UTC vs.
Revision 1.215 by ayin, Thu Feb 21 10:34:15 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 modifica- 7 * Redistribution and use in source and binary forms, with or without modifica-
8 * tion, are permitted provided that the following conditions are met: 8 * tion, are permitted provided that the following conditions are met:
9 * 9 *
… …
291typedef ev_watcher_time *WT; 291typedef ev_watcher_time *WT;
292 292
293#if EV_USE_MONOTONIC 293#if EV_USE_MONOTONIC
294/* 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 */
295/* giving it a reasonably high chance of working on typical architetcures */ 295/* giving it a reasonably high chance of working on typical architetcures */
296static 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 297#endif
298 298
299#ifdef _WIN32 299#ifdef _WIN32
300# include "ev_win32.c" 300# include "ev_win32.c"
301#endif 301#endif
… …
600 600
601#if EV_SELECT_IS_WINSOCKET 601#if EV_SELECT_IS_WINSOCKET
602 if (events) 602 if (events)
603 { 603 {
604 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
605 anfd->handle = _get_osfhandle (fd); 608 anfd->handle = _get_osfhandle (fd);
609 #endif
606 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));
607 } 611 }
608#endif 612#endif
609 613
610 { 614 {
… …
759/*****************************************************************************/ 763/*****************************************************************************/
760 764
761typedef struct 765typedef struct
762{ 766{
763 WL head; 767 WL head;
764 sig_atomic_t volatile gotsig; 768 EV_ATOMIC_T gotsig;
765} ANSIG; 769} ANSIG;
766 770
767static ANSIG *signals; 771static ANSIG *signals;
768static int signalmax; 772static int signalmax;
769 773
770static int sigpipe [2]; 774static EV_ATOMIC_T gotsig;
771static sig_atomic_t volatile gotsig;
772static ev_io sigev;
773 775
774void inline_size 776void inline_size
775signals_init (ANSIG *base, int count) 777signals_init (ANSIG *base, int count)
776{ 778{
777 while (count--) 779 while (count--)
… …
781 783
782 ++base; 784 ++base;
783 } 785 }
784} 786}
785 787
786static void 788/*****************************************************************************/
787sighandler (int signum)
788{
789#if _WIN32
790 signal (signum, sighandler);
791#endif
792
793 signals [signum - 1].gotsig = 1;
794
795 if (!gotsig)
796 {
797 int old_errno = errno;
798 gotsig = 1;
799 write (sigpipe [1], &signum, 1);
800 errno = old_errno;
801 }
802}
803
804void noinline
805ev_feed_signal_event (EV_P_ int signum)
806{
807 WL w;
808
809#if EV_MULTIPLICITY
810 assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
811#endif
812
813 --signum;
814
815 if (signum < 0 || signum >= signalmax)
816 return;
817
818 signals [signum].gotsig = 0;
819
820 for (w = signals [signum].head; w; w = w->next)
821 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
822}
823
824static void
825sigcb (EV_P_ ev_io *iow, int revents)
826{
827 int signum;
828
829 read (sigpipe [0], &revents, 1);
830 gotsig = 0;
831
832 for (signum = signalmax; signum--; )
833 if (signals [signum].gotsig)
834 ev_feed_signal_event (EV_A_ signum + 1);
835}
836 789
837void inline_speed 790void inline_speed
838fd_intern (int fd) 791fd_intern (int fd)
839{ 792{
840#ifdef _WIN32 793#ifdef _WIN32
… …
845 fcntl (fd, F_SETFL, O_NONBLOCK); 798 fcntl (fd, F_SETFL, O_NONBLOCK);
846#endif 799#endif
847} 800}
848 801
849static void noinline 802static void noinline
850siginit (EV_P) 803evpipe_init (EV_P)
851{ 804{
805 if (!ev_is_active (&pipeev))
806 {
807 while (pipe (evpipe))
808 syserr ("(libev) error creating signal/async pipe");
809
852 fd_intern (sigpipe [0]); 810 fd_intern (evpipe [0]);
853 fd_intern (sigpipe [1]); 811 fd_intern (evpipe [1]);
854 812
855 ev_io_set (&sigev, sigpipe [0], EV_READ); 813 ev_io_set (&pipeev, evpipe [0], EV_READ);
856 ev_io_start (EV_A_ &sigev); 814 ev_io_start (EV_A_ &pipeev);
857 ev_unref (EV_A); /* child watcher should not keep loop alive */ 815 ev_unref (EV_A); /* watcher should not keep loop alive */
816 }
817}
818
819void inline_size
820evpipe_write (EV_P_ EV_ATOMIC_T *flag)
821{
822 if (!*flag)
823 {
824 int old_errno = errno; /* save errno because write might clobber it */
825
826 *flag = 1;
827 write (evpipe [1], &old_errno, 1);
828
829 errno = old_errno;
830 }
831}
832
833static void
834pipecb (EV_P_ ev_io *iow, int revents)
835{
836 {
837 int dummy;
838 read (evpipe [0], &dummy, 1);
839 }
840
841 if (gotsig && ev_is_default_loop (EV_A))
842 {
843 int signum;
844 gotsig = 0;
845
846 for (signum = signalmax; signum--; )
847 if (signals [signum].gotsig)
848 ev_feed_signal_event (EV_A_ signum + 1);
849 }
850
851#if EV_ASYNC_ENABLE
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 }
864#endif
858} 865}
859 866
860/*****************************************************************************/ 867/*****************************************************************************/
861 868
869static void
870sighandler (int signum)
871{
872#if EV_MULTIPLICITY
873 struct ev_loop *loop = &default_loop_struct;
874#endif
875
876#if _WIN32
877 signal (signum, sighandler);
878#endif
879
880 signals [signum - 1].gotsig = 1;
881 evpipe_write (EV_A_ &gotsig);
882}
883
884void noinline
885ev_feed_signal_event (EV_P_ int signum)
886{
887 WL w;
888
889#if EV_MULTIPLICITY
890 assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
891#endif
892
893 --signum;
894
895 if (signum < 0 || signum >= signalmax)
896 return;
897
898 signals [signum].gotsig = 0;
899
900 for (w = signals [signum].head; w; w = w->next)
901 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
902}
903
904/*****************************************************************************/
905
862static WL childs [EV_PID_HASHSIZE]; 906static WL childs [EV_PID_HASHSIZE];
863 907
864#ifndef _WIN32 908#ifndef _WIN32
865 909
866static ev_signal childev; 910static ev_signal childev;
911
912#ifndef WIFCONTINUED
913# define WIFCONTINUED(status) 0
914#endif
867 915
868void inline_speed 916void inline_speed
869child_reap (EV_P_ ev_signal *sw, int chain, int pid, int status) 917child_reap (EV_P_ ev_signal *sw, int chain, int pid, int status)
870{ 918{
871 ev_child *w; 919 ev_child *w;
920 int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
872 921
873 for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next) 922 for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
923 {
874 if (w->pid == pid || !w->pid) 924 if ((w->pid == pid || !w->pid)
925 && (!traced || (w->flags & 1)))
875 { 926 {
876 ev_set_priority (w, ev_priority (sw)); /* need to do it *now* */ 927 ev_set_priority (w, ev_priority (sw)); /* need to do it *now* */
877 w->rpid = pid; 928 w->rpid = pid;
878 w->rstatus = status; 929 w->rstatus = status;
879 ev_feed_event (EV_A_ (W)w, EV_CHILD); 930 ev_feed_event (EV_A_ (W)w, EV_CHILD);
880 } 931 }
932 }
881} 933}
882 934
883#ifndef WCONTINUED 935#ifndef WCONTINUED
884# define WCONTINUED 0 936# define WCONTINUED 0
885#endif 937#endif
… …
1028 if (!clock_gettime (CLOCK_MONOTONIC, &ts)) 1080 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
1029 have_monotonic = 1; 1081 have_monotonic = 1;
1030 } 1082 }
1031#endif 1083#endif
1032 1084
1033 ev_rt_now = ev_time (); 1085 ev_rt_now = ev_time ();
1034 mn_now = get_clock (); 1086 mn_now = get_clock ();
1035 now_floor = mn_now; 1087 now_floor = mn_now;
1036 rtmn_diff = ev_rt_now - mn_now; 1088 rtmn_diff = ev_rt_now - mn_now;
1037 1089
1038 io_blocktime = 0.; 1090 io_blocktime = 0.;
1039 timeout_blocktime = 0.; 1091 timeout_blocktime = 0.;
1092 backend = 0;
1093 backend_fd = -1;
1094 gotasync = 0;
1095#if EV_USE_INOTIFY
1096 fs_fd = -2;
1097#endif
1040 1098
1041 /* pid check not overridable via env */ 1099 /* pid check not overridable via env */
1042#ifndef _WIN32 1100#ifndef _WIN32
1043 if (flags & EVFLAG_FORKCHECK) 1101 if (flags & EVFLAG_FORKCHECK)
1044 curpid = getpid (); 1102 curpid = getpid ();
… …
1050 flags = atoi (getenv ("LIBEV_FLAGS")); 1108 flags = atoi (getenv ("LIBEV_FLAGS"));
1051 1109
1052 if (!(flags & 0x0000ffffUL)) 1110 if (!(flags & 0x0000ffffUL))
1053 flags |= ev_recommended_backends (); 1111 flags |= ev_recommended_backends ();
1054 1112
1055 backend = 0;
1056 backend_fd = -1;
1057#if EV_USE_INOTIFY
1058 fs_fd = -2;
1059#endif
1060
1061#if EV_USE_PORT 1113#if EV_USE_PORT
1062 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags); 1114 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
1063#endif 1115#endif
1064#if EV_USE_KQUEUE 1116#if EV_USE_KQUEUE
1065 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags); 1117 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
… …
1072#endif 1124#endif
1073#if EV_USE_SELECT 1125#if EV_USE_SELECT
1074 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags); 1126 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
1075#endif 1127#endif
1076 1128
1077 ev_init (&sigev, sigcb); 1129 ev_init (&pipeev, pipecb);
1078 ev_set_priority (&sigev, EV_MAXPRI); 1130 ev_set_priority (&pipeev, EV_MAXPRI);
1079 } 1131 }
1080} 1132}
1081 1133
1082static void noinline 1134static void noinline
1083loop_destroy (EV_P) 1135loop_destroy (EV_P)
1084{ 1136{
1085 int i; 1137 int i;
1138
1139 if (ev_is_active (&pipeev))
1140 {
1141 ev_ref (EV_A); /* signal watcher */
1142 ev_io_stop (EV_A_ &pipeev);
1143
1144 close (evpipe [0]); evpipe [0] = 0;
1145 close (evpipe [1]); evpipe [1] = 0;
1146 }
1086 1147
1087#if EV_USE_INOTIFY 1148#if EV_USE_INOTIFY
1088 if (fs_fd >= 0) 1149 if (fs_fd >= 0)
1089 close (fs_fd); 1150 close (fs_fd);
1090#endif 1151#endif
… …
1127#if EV_FORK_ENABLE 1188#if EV_FORK_ENABLE
1128 array_free (fork, EMPTY); 1189 array_free (fork, EMPTY);
1129#endif 1190#endif
1130 array_free (prepare, EMPTY); 1191 array_free (prepare, EMPTY);
1131 array_free (check, EMPTY); 1192 array_free (check, EMPTY);
1193#if EV_ASYNC_ENABLE
1194 array_free (async, EMPTY);
1195#endif
1132 1196
1133 backend = 0; 1197 backend = 0;
1134} 1198}
1135 1199
1136void inline_size infy_fork (EV_P); 1200void inline_size infy_fork (EV_P);
… …
1149#endif 1213#endif
1150#if EV_USE_INOTIFY 1214#if EV_USE_INOTIFY
1151 infy_fork (EV_A); 1215 infy_fork (EV_A);
1152#endif 1216#endif
1153 1217
1154 if (ev_is_active (&sigev)) 1218 if (ev_is_active (&pipeev))
1155 { 1219 {
1156 /* default loop */ 1220 /* this "locks" the handlers against writing to the pipe */
1221 /* while we modify the fd vars */
1222 gotsig = 1;
1223#if EV_ASYNC_ENABLE
1224 gotasync = 1;
1225#endif
1157 1226
1158 ev_ref (EV_A); 1227 ev_ref (EV_A);
1159 ev_io_stop (EV_A_ &sigev); 1228 ev_io_stop (EV_A_ &pipeev);
1160 close (sigpipe [0]); 1229 close (evpipe [0]);
1161 close (sigpipe [1]); 1230 close (evpipe [1]);
1162 1231
1163 while (pipe (sigpipe))
1164 syserr ("(libev) error creating pipe");
1165
1166 siginit (EV_A); 1232 evpipe_init (EV_A);
1233 /* now iterate over everything, in case we missed something */
1234 pipecb (EV_A_ &pipeev, EV_READ);
1167 } 1235 }
1168 1236
1169 postfork = 0; 1237 postfork = 0;
1170} 1238}
1171 1239
… …
1193} 1261}
1194 1262
1195void 1263void
1196ev_loop_fork (EV_P) 1264ev_loop_fork (EV_P)
1197{ 1265{
1198 postfork = 1; 1266 postfork = 1; /* must be in line with ev_default_fork */
1199} 1267}
1200 1268
1201#endif 1269#endif
1202 1270
1203#if EV_MULTIPLICITY 1271#if EV_MULTIPLICITY
… …
1206#else 1274#else
1207int 1275int
1208ev_default_loop (unsigned int flags) 1276ev_default_loop (unsigned int flags)
1209#endif 1277#endif
1210{ 1278{
1211 if (sigpipe [0] == sigpipe [1])
1212 if (pipe (sigpipe))
1213 return 0;
1214
1215 if (!ev_default_loop_ptr) 1279 if (!ev_default_loop_ptr)
1216 { 1280 {
1217#if EV_MULTIPLICITY 1281#if EV_MULTIPLICITY
1218 struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct; 1282 struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
1219#else 1283#else
… …
1222 1286
1223 loop_init (EV_A_ flags); 1287 loop_init (EV_A_ flags);
1224 1288
1225 if (ev_backend (EV_A)) 1289 if (ev_backend (EV_A))
1226 { 1290 {
1227 siginit (EV_A);
1228
1229#ifndef _WIN32 1291#ifndef _WIN32
1230 ev_signal_init (&childev, childcb, SIGCHLD); 1292 ev_signal_init (&childev, childcb, SIGCHLD);
1231 ev_set_priority (&childev, EV_MAXPRI); 1293 ev_set_priority (&childev, EV_MAXPRI);
1232 ev_signal_start (EV_A_ &childev); 1294 ev_signal_start (EV_A_ &childev);
1233 ev_unref (EV_A); /* child watcher should not keep loop alive */ 1295 ev_unref (EV_A); /* child watcher should not keep loop alive */
… …
1250#ifndef _WIN32 1312#ifndef _WIN32
1251 ev_ref (EV_A); /* child watcher */ 1313 ev_ref (EV_A); /* child watcher */
1252 ev_signal_stop (EV_A_ &childev); 1314 ev_signal_stop (EV_A_ &childev);
1253#endif 1315#endif
1254 1316
1255 ev_ref (EV_A); /* signal watcher */
1256 ev_io_stop (EV_A_ &sigev);
1257
1258 close (sigpipe [0]); sigpipe [0] = 0;
1259 close (sigpipe [1]); sigpipe [1] = 0;
1260
1261 loop_destroy (EV_A); 1317 loop_destroy (EV_A);
1262} 1318}
1263 1319
1264void 1320void
1265ev_default_fork (void) 1321ev_default_fork (void)
… …
1267#if EV_MULTIPLICITY 1323#if EV_MULTIPLICITY
1268 struct ev_loop *loop = ev_default_loop_ptr; 1324 struct ev_loop *loop = ev_default_loop_ptr;
1269#endif 1325#endif
1270 1326
1271 if (backend) 1327 if (backend)
1272 postfork = 1; 1328 postfork = 1; /* must be in line with ev_loop_fork */
1273} 1329}
1274 1330
1275/*****************************************************************************/ 1331/*****************************************************************************/
1276 1332
1277void 1333void
… …
1851#endif 1907#endif
1852 if (expect_false (ev_is_active (w))) 1908 if (expect_false (ev_is_active (w)))
1853 return; 1909 return;
1854 1910
1855 assert (("ev_signal_start called with illegal signal number", w->signum > 0)); 1911 assert (("ev_signal_start called with illegal signal number", w->signum > 0));
1912
1913 evpipe_init (EV_A);
1856 1914
1857 { 1915 {
1858#ifndef _WIN32 1916#ifndef _WIN32
1859 sigset_t full, prev; 1917 sigset_t full, prev;
1860 sigfillset (&full); 1918 sigfillset (&full);
… …
2374 2432
2375 ev_stop (EV_A_ (W)w); 2433 ev_stop (EV_A_ (W)w);
2376} 2434}
2377#endif 2435#endif
2378 2436
2437#if EV_ASYNC_ENABLE
2438void
2439ev_async_start (EV_P_ ev_async *w)
2440{
2441 if (expect_false (ev_is_active (w)))
2442 return;
2443
2444 evpipe_init (EV_A);
2445
2446 ev_start (EV_A_ (W)w, ++asynccnt);
2447 array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
2448 asyncs [asynccnt - 1] = w;
2449}
2450
2451void
2452ev_async_stop (EV_P_ ev_async *w)
2453{
2454 clear_pending (EV_A_ (W)w);
2455 if (expect_false (!ev_is_active (w)))
2456 return;
2457
2458 {
2459 int active = ((W)w)->active;
2460 asyncs [active - 1] = asyncs [--asynccnt];
2461 ((W)asyncs [active - 1])->active = active;
2462 }
2463
2464 ev_stop (EV_A_ (W)w);
2465}
2466
2467void
2468ev_async_send (EV_P_ ev_async *w)
2469{
2470 w->sent = 1;
2471 evpipe_write (EV_A_ &gotasync);
2472}
2473#endif
2474
2379/*****************************************************************************/ 2475/*****************************************************************************/
2380 2476
2381struct ev_once 2477struct ev_once
2382{ 2478{
2383 ev_io io; 2479 ev_io io;

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