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Comparing libev/ev.c (file contents):
Revision 1.206 by root, Fri Jan 25 15:45:08 2008 UTC vs.
Revision 1.209 by root, Tue Feb 5 23:56:33 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
… …
763/*****************************************************************************/ 763/*****************************************************************************/
764 764
765typedef struct 765typedef struct
766{ 766{
767 WL head; 767 WL head;
768 sig_atomic_t volatile gotsig; 768 EV_ATOMIC_T gotsig;
769} ANSIG; 769} ANSIG;
770 770
771static ANSIG *signals; 771static ANSIG *signals;
772static int signalmax; 772static int signalmax;
773 773
774static int sigpipe [2]; 774static EV_ATOMIC_T gotsig;
775static sig_atomic_t volatile gotsig;
776static ev_io sigev;
777 775
778void inline_size 776void inline_size
779signals_init (ANSIG *base, int count) 777signals_init (ANSIG *base, int count)
780{ 778{
781 while (count--) 779 while (count--)
… …
785 783
786 ++base; 784 ++base;
787 } 785 }
788} 786}
789 787
790static void 788/*****************************************************************************/
791sighandler (int signum)
792{
793#if _WIN32
794 signal (signum, sighandler);
795#endif
796
797 signals [signum - 1].gotsig = 1;
798
799 if (!gotsig)
800 {
801 int old_errno = errno;
802 gotsig = 1;
803 write (sigpipe [1], &signum, 1);
804 errno = old_errno;
805 }
806}
807
808void noinline
809ev_feed_signal_event (EV_P_ int signum)
810{
811 WL w;
812
813#if EV_MULTIPLICITY
814 assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
815#endif
816
817 --signum;
818
819 if (signum < 0 || signum >= signalmax)
820 return;
821
822 signals [signum].gotsig = 0;
823
824 for (w = signals [signum].head; w; w = w->next)
825 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
826}
827
828static void
829sigcb (EV_P_ ev_io *iow, int revents)
830{
831 int signum;
832
833 read (sigpipe [0], &revents, 1);
834 gotsig = 0;
835
836 for (signum = signalmax; signum--; )
837 if (signals [signum].gotsig)
838 ev_feed_signal_event (EV_A_ signum + 1);
839}
840 789
841void inline_speed 790void inline_speed
842fd_intern (int fd) 791fd_intern (int fd)
843{ 792{
844#ifdef _WIN32 793#ifdef _WIN32
… …
849 fcntl (fd, F_SETFL, O_NONBLOCK); 798 fcntl (fd, F_SETFL, O_NONBLOCK);
850#endif 799#endif
851} 800}
852 801
853static void noinline 802static void noinline
854siginit (EV_P) 803evpipe_init (EV_P)
855{ 804{
805 if (!ev_is_active (&pipeev))
806 {
807 while (pipe (evpipe))
808 syserr ("(libev) error creating signal/async pipe");
809
856 fd_intern (sigpipe [0]); 810 fd_intern (evpipe [0]);
857 fd_intern (sigpipe [1]); 811 fd_intern (evpipe [1]);
858 812
859 ev_io_set (&sigev, sigpipe [0], EV_READ); 813 ev_io_set (&pipeev, evpipe [0], EV_READ);
860 ev_io_start (EV_A_ &sigev); 814 ev_io_start (EV_A_ &pipeev);
861 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 EV_ASYNC_ENABLE
853 if (gotasync)
854 {
855 int i;
856 gotasync = 0;
857
858 for (i = asynccnt; i--; )
859 if (asyncs [i]->sent)
860 {
861 asyncs [i]->sent = 0;
862 ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
863 }
864 }
865#endif
866}
867
868/*****************************************************************************/
869
870static void
871sighandler (int signum)
872{
873#if EV_MULTIPLICITY
874 struct ev_loop *loop = &default_loop_struct;
875#endif
876
877#if _WIN32
878 signal (signum, sighandler);
879#endif
880
881 signals [signum - 1].gotsig = 1;
882 evpipe_write (EV_A_ 1, 0);
883}
884
885void noinline
886ev_feed_signal_event (EV_P_ int signum)
887{
888 WL w;
889
890#if EV_MULTIPLICITY
891 assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
892#endif
893
894 --signum;
895
896 if (signum < 0 || signum >= signalmax)
897 return;
898
899 signals [signum].gotsig = 0;
900
901 for (w = signals [signum].head; w; w = w->next)
902 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
862} 903}
863 904
864/*****************************************************************************/ 905/*****************************************************************************/
865 906
866static WL childs [EV_PID_HASHSIZE]; 907static WL childs [EV_PID_HASHSIZE];
… …
1040 if (!clock_gettime (CLOCK_MONOTONIC, &ts)) 1081 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
1041 have_monotonic = 1; 1082 have_monotonic = 1;
1042 } 1083 }
1043#endif 1084#endif
1044 1085
1045 ev_rt_now = ev_time (); 1086 ev_rt_now = ev_time ();
1046 mn_now = get_clock (); 1087 mn_now = get_clock ();
1047 now_floor = mn_now; 1088 now_floor = mn_now;
1048 rtmn_diff = ev_rt_now - mn_now; 1089 rtmn_diff = ev_rt_now - mn_now;
1049 1090
1050 io_blocktime = 0.; 1091 io_blocktime = 0.;
1051 timeout_blocktime = 0.; 1092 timeout_blocktime = 0.;
1093 backend = 0;
1094 backend_fd = -1;
1095 gotasync = 0;
1096#if EV_USE_INOTIFY
1097 fs_fd = -2;
1098#endif
1052 1099
1053 /* pid check not overridable via env */ 1100 /* pid check not overridable via env */
1054#ifndef _WIN32 1101#ifndef _WIN32
1055 if (flags & EVFLAG_FORKCHECK) 1102 if (flags & EVFLAG_FORKCHECK)
1056 curpid = getpid (); 1103 curpid = getpid ();
… …
1062 flags = atoi (getenv ("LIBEV_FLAGS")); 1109 flags = atoi (getenv ("LIBEV_FLAGS"));
1063 1110
1064 if (!(flags & 0x0000ffffUL)) 1111 if (!(flags & 0x0000ffffUL))
1065 flags |= ev_recommended_backends (); 1112 flags |= ev_recommended_backends ();
1066 1113
1067 backend = 0;
1068 backend_fd = -1;
1069#if EV_USE_INOTIFY
1070 fs_fd = -2;
1071#endif
1072
1073#if EV_USE_PORT 1114#if EV_USE_PORT
1074 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags); 1115 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
1075#endif 1116#endif
1076#if EV_USE_KQUEUE 1117#if EV_USE_KQUEUE
1077 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags); 1118 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
… …
1084#endif 1125#endif
1085#if EV_USE_SELECT 1126#if EV_USE_SELECT
1086 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags); 1127 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
1087#endif 1128#endif
1088 1129
1089 ev_init (&sigev, sigcb); 1130 ev_init (&pipeev, pipecb);
1090 ev_set_priority (&sigev, EV_MAXPRI); 1131 ev_set_priority (&pipeev, EV_MAXPRI);
1091 } 1132 }
1092} 1133}
1093 1134
1094static void noinline 1135static void noinline
1095loop_destroy (EV_P) 1136loop_destroy (EV_P)
1096{ 1137{
1097 int i; 1138 int i;
1139
1140 if (ev_is_active (&pipeev))
1141 {
1142 ev_ref (EV_A); /* signal watcher */
1143 ev_io_stop (EV_A_ &pipeev);
1144
1145 close (evpipe [0]); evpipe [0] = 0;
1146 close (evpipe [1]); evpipe [1] = 0;
1147 }
1098 1148
1099#if EV_USE_INOTIFY 1149#if EV_USE_INOTIFY
1100 if (fs_fd >= 0) 1150 if (fs_fd >= 0)
1101 close (fs_fd); 1151 close (fs_fd);
1102#endif 1152#endif
… …
1139#if EV_FORK_ENABLE 1189#if EV_FORK_ENABLE
1140 array_free (fork, EMPTY); 1190 array_free (fork, EMPTY);
1141#endif 1191#endif
1142 array_free (prepare, EMPTY); 1192 array_free (prepare, EMPTY);
1143 array_free (check, EMPTY); 1193 array_free (check, EMPTY);
1194#if EV_ASYNC_ENABLE
1195 array_free (async, EMPTY);
1196#endif
1144 1197
1145 backend = 0; 1198 backend = 0;
1146} 1199}
1147 1200
1148void inline_size infy_fork (EV_P); 1201void inline_size infy_fork (EV_P);
… …
1161#endif 1214#endif
1162#if EV_USE_INOTIFY 1215#if EV_USE_INOTIFY
1163 infy_fork (EV_A); 1216 infy_fork (EV_A);
1164#endif 1217#endif
1165 1218
1166 if (ev_is_active (&sigev)) 1219 if (ev_is_active (&pipeev))
1167 { 1220 {
1168 /* default loop */ 1221 /* this "locks" the handlers against writing to the pipe */
1222 gotsig = gotasync = 1;
1169 1223
1170 ev_ref (EV_A); 1224 ev_ref (EV_A);
1171 ev_io_stop (EV_A_ &sigev); 1225 ev_io_stop (EV_A_ &pipeev);
1172 close (sigpipe [0]); 1226 close (evpipe [0]);
1173 close (sigpipe [1]); 1227 close (evpipe [1]);
1174 1228
1175 while (pipe (sigpipe))
1176 syserr ("(libev) error creating pipe");
1177
1178 siginit (EV_A); 1229 evpipe_init (EV_A);
1230 /* now iterate over everything, in case we missed something */
1179 sigcb (EV_A_ &sigev, EV_READ); 1231 pipecb (EV_A_ &pipeev, EV_READ);
1180 } 1232 }
1181 1233
1182 postfork = 0; 1234 postfork = 0;
1183} 1235}
1184 1236
… …
1219#else 1271#else
1220int 1272int
1221ev_default_loop (unsigned int flags) 1273ev_default_loop (unsigned int flags)
1222#endif 1274#endif
1223{ 1275{
1224 if (sigpipe [0] == sigpipe [1])
1225 if (pipe (sigpipe))
1226 return 0;
1227
1228 if (!ev_default_loop_ptr) 1276 if (!ev_default_loop_ptr)
1229 { 1277 {
1230#if EV_MULTIPLICITY 1278#if EV_MULTIPLICITY
1231 struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct; 1279 struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
1232#else 1280#else
… …
1235 1283
1236 loop_init (EV_A_ flags); 1284 loop_init (EV_A_ flags);
1237 1285
1238 if (ev_backend (EV_A)) 1286 if (ev_backend (EV_A))
1239 { 1287 {
1240 siginit (EV_A);
1241
1242#ifndef _WIN32 1288#ifndef _WIN32
1243 ev_signal_init (&childev, childcb, SIGCHLD); 1289 ev_signal_init (&childev, childcb, SIGCHLD);
1244 ev_set_priority (&childev, EV_MAXPRI); 1290 ev_set_priority (&childev, EV_MAXPRI);
1245 ev_signal_start (EV_A_ &childev); 1291 ev_signal_start (EV_A_ &childev);
1246 ev_unref (EV_A); /* child watcher should not keep loop alive */ 1292 ev_unref (EV_A); /* child watcher should not keep loop alive */
… …
1262 1308
1263#ifndef _WIN32 1309#ifndef _WIN32
1264 ev_ref (EV_A); /* child watcher */ 1310 ev_ref (EV_A); /* child watcher */
1265 ev_signal_stop (EV_A_ &childev); 1311 ev_signal_stop (EV_A_ &childev);
1266#endif 1312#endif
1267
1268 ev_ref (EV_A); /* signal watcher */
1269 ev_io_stop (EV_A_ &sigev);
1270
1271 close (sigpipe [0]); sigpipe [0] = 0;
1272 close (sigpipe [1]); sigpipe [1] = 0;
1273 1313
1274 loop_destroy (EV_A); 1314 loop_destroy (EV_A);
1275} 1315}
1276 1316
1277void 1317void
… …
1864#endif 1904#endif
1865 if (expect_false (ev_is_active (w))) 1905 if (expect_false (ev_is_active (w)))
1866 return; 1906 return;
1867 1907
1868 assert (("ev_signal_start called with illegal signal number", w->signum > 0)); 1908 assert (("ev_signal_start called with illegal signal number", w->signum > 0));
1909
1910 evpipe_init (EV_A);
1869 1911
1870 { 1912 {
1871#ifndef _WIN32 1913#ifndef _WIN32
1872 sigset_t full, prev; 1914 sigset_t full, prev;
1873 sigfillset (&full); 1915 sigfillset (&full);
… …
2387 2429
2388 ev_stop (EV_A_ (W)w); 2430 ev_stop (EV_A_ (W)w);
2389} 2431}
2390#endif 2432#endif
2391 2433
2434#if EV_ASYNC_ENABLE
2435void
2436ev_async_start (EV_P_ ev_async *w)
2437{
2438 if (expect_false (ev_is_active (w)))
2439 return;
2440
2441 evpipe_init (EV_A);
2442
2443 ev_start (EV_A_ (W)w, ++asynccnt);
2444 array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
2445 asyncs [asynccnt - 1] = w;
2446}
2447
2448void
2449ev_async_stop (EV_P_ ev_async *w)
2450{
2451 clear_pending (EV_A_ (W)w);
2452 if (expect_false (!ev_is_active (w)))
2453 return;
2454
2455 {
2456 int active = ((W)w)->active;
2457 asyncs [active - 1] = asyncs [--asynccnt];
2458 ((W)asyncs [active - 1])->active = active;
2459 }
2460
2461 ev_stop (EV_A_ (W)w);
2462}
2463
2464void
2465ev_async_send (EV_P_ ev_async *w)
2466{
2467 w->sent = 1;
2468 evpipe_write (EV_A_ 0, 1);
2469}
2470#endif
2471
2392/*****************************************************************************/ 2472/*****************************************************************************/
2393 2473
2394struct ev_once 2474struct ev_once
2395{ 2475{
2396 ev_io io; 2476 ev_io io;

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