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Comparing libev/ev.c (file contents):
Revision 1.200 by root, Wed Dec 26 08:06:09 2007 UTC vs.
Revision 1.218 by root, Sun Mar 23 00:05:03 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
… …
451 ts.tv_sec = (time_t)delay; 451 ts.tv_sec = (time_t)delay;
452 ts.tv_nsec = (long)((delay - (ev_tstamp)(ts.tv_sec)) * 1e9); 452 ts.tv_nsec = (long)((delay - (ev_tstamp)(ts.tv_sec)) * 1e9);
453 453
454 nanosleep (&ts, 0); 454 nanosleep (&ts, 0);
455#elif defined(_WIN32) 455#elif defined(_WIN32)
456 Sleep (delay * 1e3); 456 Sleep ((unsigned long)(delay * 1e3));
457#else 457#else
458 struct timeval tv; 458 struct timeval tv;
459 459
460 tv.tv_sec = (time_t)delay; 460 tv.tv_sec = (time_t)delay;
461 tv.tv_usec = (long)((delay - (ev_tstamp)(tv.tv_sec)) * 1e6); 461 tv.tv_usec = (long)((delay - (ev_tstamp)(tv.tv_sec)) * 1e6);
… …
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); /* 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
862} 865}
863 866
864/*****************************************************************************/ 867/*****************************************************************************/
865 868
869static void
870ev_sighandler (int signum)
871{
872#if EV_MULTIPLICITY
873 struct ev_loop *loop = &default_loop_struct;
874#endif
875
876#if _WIN32
877 signal (signum, ev_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
866static WL childs [EV_PID_HASHSIZE]; 906static WL childs [EV_PID_HASHSIZE];
867 907
868#ifndef _WIN32 908#ifndef _WIN32
869 909
870static ev_signal childev; 910static ev_signal childev;
871 911
912#ifndef WIFCONTINUED
913# define WIFCONTINUED(status) 0
914#endif
915
872void inline_speed 916void inline_speed
873child_reap (EV_P_ ev_signal *sw, int chain, int pid, int status) 917child_reap (EV_P_ int chain, int pid, int status)
874{ 918{
875 ev_child *w; 919 ev_child *w;
920 int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
876 921
877 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 {
878 if (w->pid == pid || !w->pid) 924 if ((w->pid == pid || !w->pid)
925 && (!traced || (w->flags & 1)))
879 { 926 {
880 ev_set_priority (w, ev_priority (sw)); /* need to do it *now* */ 927 ev_set_priority (w, EV_MAXPRI); /* need to do it *now*, this *must* be the same prio as the signal watcher itself */
881 w->rpid = pid; 928 w->rpid = pid;
882 w->rstatus = status; 929 w->rstatus = status;
883 ev_feed_event (EV_A_ (W)w, EV_CHILD); 930 ev_feed_event (EV_A_ (W)w, EV_CHILD);
884 } 931 }
932 }
885} 933}
886 934
887#ifndef WCONTINUED 935#ifndef WCONTINUED
888# define WCONTINUED 0 936# define WCONTINUED 0
889#endif 937#endif
… …
898 if (!WCONTINUED 946 if (!WCONTINUED
899 || errno != EINVAL 947 || errno != EINVAL
900 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED))) 948 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
901 return; 949 return;
902 950
903 /* make sure we are called again until all childs have been reaped */ 951 /* make sure we are called again until all children have been reaped */
904 /* we need to do it this way so that the callback gets called before we continue */ 952 /* we need to do it this way so that the callback gets called before we continue */
905 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL); 953 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
906 954
907 child_reap (EV_A_ sw, pid, pid, status); 955 child_reap (EV_A_ pid, pid, status);
908 if (EV_PID_HASHSIZE > 1) 956 if (EV_PID_HASHSIZE > 1)
909 child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */ 957 child_reap (EV_A_ 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
910} 958}
911 959
912#endif 960#endif
913 961
914/*****************************************************************************/ 962/*****************************************************************************/
… …
1032 if (!clock_gettime (CLOCK_MONOTONIC, &ts)) 1080 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
1033 have_monotonic = 1; 1081 have_monotonic = 1;
1034 } 1082 }
1035#endif 1083#endif
1036 1084
1037 ev_rt_now = ev_time (); 1085 ev_rt_now = ev_time ();
1038 mn_now = get_clock (); 1086 mn_now = get_clock ();
1039 now_floor = mn_now; 1087 now_floor = mn_now;
1040 rtmn_diff = ev_rt_now - mn_now; 1088 rtmn_diff = ev_rt_now - mn_now;
1041 1089
1042 io_blocktime = 0.; 1090 io_blocktime = 0.;
1043 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
1044 1098
1045 /* pid check not overridable via env */ 1099 /* pid check not overridable via env */
1046#ifndef _WIN32 1100#ifndef _WIN32
1047 if (flags & EVFLAG_FORKCHECK) 1101 if (flags & EVFLAG_FORKCHECK)
1048 curpid = getpid (); 1102 curpid = getpid ();
… …
1054 flags = atoi (getenv ("LIBEV_FLAGS")); 1108 flags = atoi (getenv ("LIBEV_FLAGS"));
1055 1109
1056 if (!(flags & 0x0000ffffUL)) 1110 if (!(flags & 0x0000ffffUL))
1057 flags |= ev_recommended_backends (); 1111 flags |= ev_recommended_backends ();
1058 1112
1059 backend = 0;
1060 backend_fd = -1;
1061#if EV_USE_INOTIFY
1062 fs_fd = -2;
1063#endif
1064
1065#if EV_USE_PORT 1113#if EV_USE_PORT
1066 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags); 1114 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
1067#endif 1115#endif
1068#if EV_USE_KQUEUE 1116#if EV_USE_KQUEUE
1069 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags); 1117 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
… …
1076#endif 1124#endif
1077#if EV_USE_SELECT 1125#if EV_USE_SELECT
1078 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags); 1126 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
1079#endif 1127#endif
1080 1128
1081 ev_init (&sigev, sigcb); 1129 ev_init (&pipeev, pipecb);
1082 ev_set_priority (&sigev, EV_MAXPRI); 1130 ev_set_priority (&pipeev, EV_MAXPRI);
1083 } 1131 }
1084} 1132}
1085 1133
1086static void noinline 1134static void noinline
1087loop_destroy (EV_P) 1135loop_destroy (EV_P)
1088{ 1136{
1089 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 }
1090 1147
1091#if EV_USE_INOTIFY 1148#if EV_USE_INOTIFY
1092 if (fs_fd >= 0) 1149 if (fs_fd >= 0)
1093 close (fs_fd); 1150 close (fs_fd);
1094#endif 1151#endif
… …
1131#if EV_FORK_ENABLE 1188#if EV_FORK_ENABLE
1132 array_free (fork, EMPTY); 1189 array_free (fork, EMPTY);
1133#endif 1190#endif
1134 array_free (prepare, EMPTY); 1191 array_free (prepare, EMPTY);
1135 array_free (check, EMPTY); 1192 array_free (check, EMPTY);
1193#if EV_ASYNC_ENABLE
1194 array_free (async, EMPTY);
1195#endif
1136 1196
1137 backend = 0; 1197 backend = 0;
1138} 1198}
1139 1199
1140void inline_size infy_fork (EV_P); 1200void inline_size infy_fork (EV_P);
… …
1153#endif 1213#endif
1154#if EV_USE_INOTIFY 1214#if EV_USE_INOTIFY
1155 infy_fork (EV_A); 1215 infy_fork (EV_A);
1156#endif 1216#endif
1157 1217
1158 if (ev_is_active (&sigev)) 1218 if (ev_is_active (&pipeev))
1159 { 1219 {
1160 /* 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
1161 1226
1162 ev_ref (EV_A); 1227 ev_ref (EV_A);
1163 ev_io_stop (EV_A_ &sigev); 1228 ev_io_stop (EV_A_ &pipeev);
1164 close (sigpipe [0]); 1229 close (evpipe [0]);
1165 close (sigpipe [1]); 1230 close (evpipe [1]);
1166 1231
1167 while (pipe (sigpipe))
1168 syserr ("(libev) error creating pipe");
1169
1170 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);
1171 } 1235 }
1172 1236
1173 postfork = 0; 1237 postfork = 0;
1174} 1238}
1175 1239
… …
1197} 1261}
1198 1262
1199void 1263void
1200ev_loop_fork (EV_P) 1264ev_loop_fork (EV_P)
1201{ 1265{
1202 postfork = 1; 1266 postfork = 1; /* must be in line with ev_default_fork */
1203} 1267}
1204 1268
1205#endif 1269#endif
1206 1270
1207#if EV_MULTIPLICITY 1271#if EV_MULTIPLICITY
… …
1210#else 1274#else
1211int 1275int
1212ev_default_loop (unsigned int flags) 1276ev_default_loop (unsigned int flags)
1213#endif 1277#endif
1214{ 1278{
1215 if (sigpipe [0] == sigpipe [1])
1216 if (pipe (sigpipe))
1217 return 0;
1218
1219 if (!ev_default_loop_ptr) 1279 if (!ev_default_loop_ptr)
1220 { 1280 {
1221#if EV_MULTIPLICITY 1281#if EV_MULTIPLICITY
1222 struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct; 1282 struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
1223#else 1283#else
… …
1226 1286
1227 loop_init (EV_A_ flags); 1287 loop_init (EV_A_ flags);
1228 1288
1229 if (ev_backend (EV_A)) 1289 if (ev_backend (EV_A))
1230 { 1290 {
1231 siginit (EV_A);
1232
1233#ifndef _WIN32 1291#ifndef _WIN32
1234 ev_signal_init (&childev, childcb, SIGCHLD); 1292 ev_signal_init (&childev, childcb, SIGCHLD);
1235 ev_set_priority (&childev, EV_MAXPRI); 1293 ev_set_priority (&childev, EV_MAXPRI);
1236 ev_signal_start (EV_A_ &childev); 1294 ev_signal_start (EV_A_ &childev);
1237 ev_unref (EV_A); /* child watcher should not keep loop alive */ 1295 ev_unref (EV_A); /* child watcher should not keep loop alive */
… …
1254#ifndef _WIN32 1312#ifndef _WIN32
1255 ev_ref (EV_A); /* child watcher */ 1313 ev_ref (EV_A); /* child watcher */
1256 ev_signal_stop (EV_A_ &childev); 1314 ev_signal_stop (EV_A_ &childev);
1257#endif 1315#endif
1258 1316
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); 1317 loop_destroy (EV_A);
1266} 1318}
1267 1319
1268void 1320void
1269ev_default_fork (void) 1321ev_default_fork (void)
… …
1271#if EV_MULTIPLICITY 1323#if EV_MULTIPLICITY
1272 struct ev_loop *loop = ev_default_loop_ptr; 1324 struct ev_loop *loop = ev_default_loop_ptr;
1273#endif 1325#endif
1274 1326
1275 if (backend) 1327 if (backend)
1276 postfork = 1; 1328 postfork = 1; /* must be in line with ev_loop_fork */
1277} 1329}
1278 1330
1279/*****************************************************************************/ 1331/*****************************************************************************/
1280 1332
1281void 1333void
… …
1856 if (expect_false (ev_is_active (w))) 1908 if (expect_false (ev_is_active (w)))
1857 return; 1909 return;
1858 1910
1859 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));
1860 1912
1913 evpipe_init (EV_A);
1914
1861 { 1915 {
1862#ifndef _WIN32 1916#ifndef _WIN32
1863 sigset_t full, prev; 1917 sigset_t full, prev;
1864 sigfillset (&full); 1918 sigfillset (&full);
1865 sigprocmask (SIG_SETMASK, &full, &prev); 1919 sigprocmask (SIG_SETMASK, &full, &prev);
… …
1876 wlist_add (&signals [w->signum - 1].head, (WL)w); 1930 wlist_add (&signals [w->signum - 1].head, (WL)w);
1877 1931
1878 if (!((WL)w)->next) 1932 if (!((WL)w)->next)
1879 { 1933 {
1880#if _WIN32 1934#if _WIN32
1881 signal (w->signum, sighandler); 1935 signal (w->signum, ev_sighandler);
1882#else 1936#else
1883 struct sigaction sa; 1937 struct sigaction sa;
1884 sa.sa_handler = sighandler; 1938 sa.sa_handler = ev_sighandler;
1885 sigfillset (&sa.sa_mask); 1939 sigfillset (&sa.sa_mask);
1886 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */ 1940 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
1887 sigaction (w->signum, &sa, 0); 1941 sigaction (w->signum, &sa, 0);
1888#endif 1942#endif
1889 } 1943 }
… …
2378 2432
2379 ev_stop (EV_A_ (W)w); 2433 ev_stop (EV_A_ (W)w);
2380} 2434}
2381#endif 2435#endif
2382 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
2383/*****************************************************************************/ 2475/*****************************************************************************/
2384 2476
2385struct ev_once 2477struct ev_once
2386{ 2478{
2387 ev_io io; 2479 ev_io io;

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