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Comparing libev/ev.c (file contents):
Revision 1.202 by root, Sat Dec 29 16:19:36 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 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 (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 }
862} 864}
863 865
864/*****************************************************************************/ 866/*****************************************************************************/
865 867
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
866static WL childs [EV_PID_HASHSIZE]; 905static WL childs [EV_PID_HASHSIZE];
867 906
868#ifndef _WIN32 907#ifndef _WIN32
869 908
870static ev_signal childev; 909static ev_signal childev;
910
911#ifndef WIFCONTINUED
912# define WIFCONTINUED(status) 0
913#endif
871 914
872void inline_speed 915void inline_speed
873child_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)
874{ 917{
875 ev_child *w; 918 ev_child *w;
919 int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
876 920
877 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 {
878 if (w->pid == pid || !w->pid) 923 if ((w->pid == pid || !w->pid)
924 && (!traced || (w->flags & 1)))
879 { 925 {
880 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* */
881 w->rpid = pid; 927 w->rpid = pid;
882 w->rstatus = status; 928 w->rstatus = status;
883 ev_feed_event (EV_A_ (W)w, EV_CHILD); 929 ev_feed_event (EV_A_ (W)w, EV_CHILD);
884 } 930 }
931 }
885} 932}
886 933
887#ifndef WCONTINUED 934#ifndef WCONTINUED
888# define WCONTINUED 0 935# define WCONTINUED 0
889#endif 936#endif
… …
1076#endif 1123#endif
1077#if EV_USE_SELECT 1124#if EV_USE_SELECT
1078 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags); 1125 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
1079#endif 1126#endif
1080 1127
1081 ev_init (&sigev, sigcb); 1128 ev_init (&pipeev, pipecb);
1082 ev_set_priority (&sigev, EV_MAXPRI); 1129 ev_set_priority (&pipeev, EV_MAXPRI);
1083 } 1130 }
1084} 1131}
1085 1132
1086static void noinline 1133static void noinline
1087loop_destroy (EV_P) 1134loop_destroy (EV_P)
1088{ 1135{
1089 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 }
1090 1146
1091#if EV_USE_INOTIFY 1147#if EV_USE_INOTIFY
1092 if (fs_fd >= 0) 1148 if (fs_fd >= 0)
1093 close (fs_fd); 1149 close (fs_fd);
1094#endif 1150#endif
… …
1153#endif 1209#endif
1154#if EV_USE_INOTIFY 1210#if EV_USE_INOTIFY
1155 infy_fork (EV_A); 1211 infy_fork (EV_A);
1156#endif 1212#endif
1157 1213
1158 if (ev_is_active (&sigev)) 1214 if (ev_is_active (&pipeev))
1159 { 1215 {
1160 /* default loop */ 1216 /* this "locks" the handlers against writing to the pipe */
1217 gotsig = gotasync = 1;
1161 1218
1162 ev_ref (EV_A); 1219 ev_ref (EV_A);
1163 ev_io_stop (EV_A_ &sigev); 1220 ev_io_stop (EV_A_ &pipeev);
1164 close (sigpipe [0]); 1221 close (evpipe [0]);
1165 close (sigpipe [1]); 1222 close (evpipe [1]);
1166 1223
1167 while (pipe (sigpipe))
1168 syserr ("(libev) error creating pipe");
1169
1170 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);
1171 } 1227 }
1172 1228
1173 postfork = 0; 1229 postfork = 0;
1174} 1230}
1175 1231
… …
1197} 1253}
1198 1254
1199void 1255void
1200ev_loop_fork (EV_P) 1256ev_loop_fork (EV_P)
1201{ 1257{
1202 postfork = 1; 1258 postfork = 1; /* must be in line with ev_default_fork */
1203} 1259}
1204 1260
1205#endif 1261#endif
1206 1262
1207#if EV_MULTIPLICITY 1263#if EV_MULTIPLICITY
… …
1210#else 1266#else
1211int 1267int
1212ev_default_loop (unsigned int flags) 1268ev_default_loop (unsigned int flags)
1213#endif 1269#endif
1214{ 1270{
1215 if (sigpipe [0] == sigpipe [1])
1216 if (pipe (sigpipe))
1217 return 0;
1218
1219 if (!ev_default_loop_ptr) 1271 if (!ev_default_loop_ptr)
1220 { 1272 {
1221#if EV_MULTIPLICITY 1273#if EV_MULTIPLICITY
1222 struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct; 1274 struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
1223#else 1275#else
… …
1226 1278
1227 loop_init (EV_A_ flags); 1279 loop_init (EV_A_ flags);
1228 1280
1229 if (ev_backend (EV_A)) 1281 if (ev_backend (EV_A))
1230 { 1282 {
1231 siginit (EV_A);
1232
1233#ifndef _WIN32 1283#ifndef _WIN32
1234 ev_signal_init (&childev, childcb, SIGCHLD); 1284 ev_signal_init (&childev, childcb, SIGCHLD);
1235 ev_set_priority (&childev, EV_MAXPRI); 1285 ev_set_priority (&childev, EV_MAXPRI);
1236 ev_signal_start (EV_A_ &childev); 1286 ev_signal_start (EV_A_ &childev);
1237 ev_unref (EV_A); /* child watcher should not keep loop alive */ 1287 ev_unref (EV_A); /* child watcher should not keep loop alive */
… …
1254#ifndef _WIN32 1304#ifndef _WIN32
1255 ev_ref (EV_A); /* child watcher */ 1305 ev_ref (EV_A); /* child watcher */
1256 ev_signal_stop (EV_A_ &childev); 1306 ev_signal_stop (EV_A_ &childev);
1257#endif 1307#endif
1258 1308
1259 ev_ref (EV_A); /* signal watcher */
1260 ev_io_stop (EV_A_ &sigev);
1261
1262 close (sigpipe [0]); sigpipe [0] = 0;
1263 close (sigpipe [1]); sigpipe [1] = 0;
1264
1265 loop_destroy (EV_A); 1309 loop_destroy (EV_A);
1266} 1310}
1267 1311
1268void 1312void
1269ev_default_fork (void) 1313ev_default_fork (void)
… …
1271#if EV_MULTIPLICITY 1315#if EV_MULTIPLICITY
1272 struct ev_loop *loop = ev_default_loop_ptr; 1316 struct ev_loop *loop = ev_default_loop_ptr;
1273#endif 1317#endif
1274 1318
1275 if (backend) 1319 if (backend)
1276 postfork = 1; 1320 postfork = 1; /* must be in line with ev_loop_fork */
1277} 1321}
1278 1322
1279/*****************************************************************************/ 1323/*****************************************************************************/
1280 1324
1281void 1325void
… …
1855#endif 1899#endif
1856 if (expect_false (ev_is_active (w))) 1900 if (expect_false (ev_is_active (w)))
1857 return; 1901 return;
1858 1902
1859 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);
1860 1906
1861 { 1907 {
1862#ifndef _WIN32 1908#ifndef _WIN32
1863 sigset_t full, prev; 1909 sigset_t full, prev;
1864 sigfillset (&full); 1910 sigfillset (&full);
… …
2378 2424
2379 ev_stop (EV_A_ (W)w); 2425 ev_stop (EV_A_ (W)w);
2380} 2426}
2381#endif 2427#endif
2382 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
2383/*****************************************************************************/ 2467/*****************************************************************************/
2384 2468
2385struct ev_once 2469struct ev_once
2386{ 2470{
2387 ev_io io; 2471 ev_io io;

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