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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 1.217 by root, Sat Mar 22 13:42:45 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
865}
866
867/*****************************************************************************/
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);
862} 902}
863 903
864/*****************************************************************************/ 904/*****************************************************************************/
865 905
866static WL childs [EV_PID_HASHSIZE]; 906static WL childs [EV_PID_HASHSIZE];
… …
872#ifndef WIFCONTINUED 912#ifndef WIFCONTINUED
873# define WIFCONTINUED(status) 0 913# define WIFCONTINUED(status) 0
874#endif 914#endif
875 915
876void inline_speed 916void inline_speed
877child_reap (EV_P_ ev_signal *sw, int chain, int pid, int status) 917child_reap (EV_P_ int chain, int pid, int status)
878{ 918{
879 ev_child *w; 919 ev_child *w;
880 int traced = WIFSTOPPED (status) || WIFCONTINUED (status); 920 int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
881 921
882 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)
883 { 923 {
884 if ((w->pid == pid || !w->pid) 924 if ((w->pid == pid || !w->pid)
885 && (!traced || (w->flags & 1))) 925 && (!traced || (w->flags & 1)))
886 { 926 {
887 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 */
888 w->rpid = pid; 928 w->rpid = pid;
889 w->rstatus = status; 929 w->rstatus = status;
890 ev_feed_event (EV_A_ (W)w, EV_CHILD); 930 ev_feed_event (EV_A_ (W)w, EV_CHILD);
891 } 931 }
892 } 932 }
… …
906 if (!WCONTINUED 946 if (!WCONTINUED
907 || errno != EINVAL 947 || errno != EINVAL
908 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED))) 948 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
909 return; 949 return;
910 950
911 /* 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 */
912 /* 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 */
913 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL); 953 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
914 954
915 child_reap (EV_A_ sw, pid, pid, status); 955 child_reap (EV_A_ pid, pid, status);
916 if (EV_PID_HASHSIZE > 1) 956 if (EV_PID_HASHSIZE > 1)
917 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 */
918} 958}
919 959
920#endif 960#endif
921 961
922/*****************************************************************************/ 962/*****************************************************************************/
… …
1040 if (!clock_gettime (CLOCK_MONOTONIC, &ts)) 1080 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
1041 have_monotonic = 1; 1081 have_monotonic = 1;
1042 } 1082 }
1043#endif 1083#endif
1044 1084
1045 ev_rt_now = ev_time (); 1085 ev_rt_now = ev_time ();
1046 mn_now = get_clock (); 1086 mn_now = get_clock ();
1047 now_floor = mn_now; 1087 now_floor = mn_now;
1048 rtmn_diff = ev_rt_now - mn_now; 1088 rtmn_diff = ev_rt_now - mn_now;
1049 1089
1050 io_blocktime = 0.; 1090 io_blocktime = 0.;
1051 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
1052 1098
1053 /* pid check not overridable via env */ 1099 /* pid check not overridable via env */
1054#ifndef _WIN32 1100#ifndef _WIN32
1055 if (flags & EVFLAG_FORKCHECK) 1101 if (flags & EVFLAG_FORKCHECK)
1056 curpid = getpid (); 1102 curpid = getpid ();
… …
1062 flags = atoi (getenv ("LIBEV_FLAGS")); 1108 flags = atoi (getenv ("LIBEV_FLAGS"));
1063 1109
1064 if (!(flags & 0x0000ffffUL)) 1110 if (!(flags & 0x0000ffffUL))
1065 flags |= ev_recommended_backends (); 1111 flags |= ev_recommended_backends ();
1066 1112
1067 backend = 0;
1068 backend_fd = -1;
1069#if EV_USE_INOTIFY
1070 fs_fd = -2;
1071#endif
1072
1073#if EV_USE_PORT 1113#if EV_USE_PORT
1074 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags); 1114 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
1075#endif 1115#endif
1076#if EV_USE_KQUEUE 1116#if EV_USE_KQUEUE
1077 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags); 1117 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
… …
1084#endif 1124#endif
1085#if EV_USE_SELECT 1125#if EV_USE_SELECT
1086 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags); 1126 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
1087#endif 1127#endif
1088 1128
1089 ev_init (&sigev, sigcb); 1129 ev_init (&pipeev, pipecb);
1090 ev_set_priority (&sigev, EV_MAXPRI); 1130 ev_set_priority (&pipeev, EV_MAXPRI);
1091 } 1131 }
1092} 1132}
1093 1133
1094static void noinline 1134static void noinline
1095loop_destroy (EV_P) 1135loop_destroy (EV_P)
1096{ 1136{
1097 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 }
1098 1147
1099#if EV_USE_INOTIFY 1148#if EV_USE_INOTIFY
1100 if (fs_fd >= 0) 1149 if (fs_fd >= 0)
1101 close (fs_fd); 1150 close (fs_fd);
1102#endif 1151#endif
… …
1139#if EV_FORK_ENABLE 1188#if EV_FORK_ENABLE
1140 array_free (fork, EMPTY); 1189 array_free (fork, EMPTY);
1141#endif 1190#endif
1142 array_free (prepare, EMPTY); 1191 array_free (prepare, EMPTY);
1143 array_free (check, EMPTY); 1192 array_free (check, EMPTY);
1193#if EV_ASYNC_ENABLE
1194 array_free (async, EMPTY);
1195#endif
1144 1196
1145 backend = 0; 1197 backend = 0;
1146} 1198}
1147 1199
1148void inline_size infy_fork (EV_P); 1200void inline_size infy_fork (EV_P);
… …
1161#endif 1213#endif
1162#if EV_USE_INOTIFY 1214#if EV_USE_INOTIFY
1163 infy_fork (EV_A); 1215 infy_fork (EV_A);
1164#endif 1216#endif
1165 1217
1166 if (ev_is_active (&sigev)) 1218 if (ev_is_active (&pipeev))
1167 { 1219 {
1168 /* 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
1169 1226
1170 ev_ref (EV_A); 1227 ev_ref (EV_A);
1171 ev_io_stop (EV_A_ &sigev); 1228 ev_io_stop (EV_A_ &pipeev);
1172 close (sigpipe [0]); 1229 close (evpipe [0]);
1173 close (sigpipe [1]); 1230 close (evpipe [1]);
1174 1231
1175 while (pipe (sigpipe))
1176 syserr ("(libev) error creating pipe");
1177
1178 siginit (EV_A); 1232 evpipe_init (EV_A);
1233 /* now iterate over everything, in case we missed something */
1179 sigcb (EV_A_ &sigev, EV_READ); 1234 pipecb (EV_A_ &pipeev, EV_READ);
1180 } 1235 }
1181 1236
1182 postfork = 0; 1237 postfork = 0;
1183} 1238}
1184 1239
… …
1219#else 1274#else
1220int 1275int
1221ev_default_loop (unsigned int flags) 1276ev_default_loop (unsigned int flags)
1222#endif 1277#endif
1223{ 1278{
1224 if (sigpipe [0] == sigpipe [1])
1225 if (pipe (sigpipe))
1226 return 0;
1227
1228 if (!ev_default_loop_ptr) 1279 if (!ev_default_loop_ptr)
1229 { 1280 {
1230#if EV_MULTIPLICITY 1281#if EV_MULTIPLICITY
1231 struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct; 1282 struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
1232#else 1283#else
… …
1235 1286
1236 loop_init (EV_A_ flags); 1287 loop_init (EV_A_ flags);
1237 1288
1238 if (ev_backend (EV_A)) 1289 if (ev_backend (EV_A))
1239 { 1290 {
1240 siginit (EV_A);
1241
1242#ifndef _WIN32 1291#ifndef _WIN32
1243 ev_signal_init (&childev, childcb, SIGCHLD); 1292 ev_signal_init (&childev, childcb, SIGCHLD);
1244 ev_set_priority (&childev, EV_MAXPRI); 1293 ev_set_priority (&childev, EV_MAXPRI);
1245 ev_signal_start (EV_A_ &childev); 1294 ev_signal_start (EV_A_ &childev);
1246 ev_unref (EV_A); /* child watcher should not keep loop alive */ 1295 ev_unref (EV_A); /* child watcher should not keep loop alive */
… …
1262 1311
1263#ifndef _WIN32 1312#ifndef _WIN32
1264 ev_ref (EV_A); /* child watcher */ 1313 ev_ref (EV_A); /* child watcher */
1265 ev_signal_stop (EV_A_ &childev); 1314 ev_signal_stop (EV_A_ &childev);
1266#endif 1315#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 1316
1274 loop_destroy (EV_A); 1317 loop_destroy (EV_A);
1275} 1318}
1276 1319
1277void 1320void
… …
1864#endif 1907#endif
1865 if (expect_false (ev_is_active (w))) 1908 if (expect_false (ev_is_active (w)))
1866 return; 1909 return;
1867 1910
1868 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);
1869 1914
1870 { 1915 {
1871#ifndef _WIN32 1916#ifndef _WIN32
1872 sigset_t full, prev; 1917 sigset_t full, prev;
1873 sigfillset (&full); 1918 sigfillset (&full);
… …
2387 2432
2388 ev_stop (EV_A_ (W)w); 2433 ev_stop (EV_A_ (W)w);
2389} 2434}
2390#endif 2435#endif
2391 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
2392/*****************************************************************************/ 2475/*****************************************************************************/
2393 2476
2394struct ev_once 2477struct ev_once
2395{ 2478{
2396 ev_io io; 2479 ev_io io;

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