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 | * |
… | |
… | |
291 | typedef ev_watcher_time *WT; |
291 | typedef 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 */ |
296 | static sig_atomic_t have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */ |
296 | static 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 | |
765 | typedef struct |
765 | typedef 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 | |
771 | static ANSIG *signals; |
771 | static ANSIG *signals; |
772 | static int signalmax; |
772 | static int signalmax; |
773 | |
773 | |
774 | static int sigpipe [2]; |
774 | static EV_ATOMIC_T gotsig; |
775 | static sig_atomic_t volatile gotsig; |
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|
776 | static ev_io sigev; |
|
|
777 | |
775 | |
778 | void inline_size |
776 | void inline_size |
779 | signals_init (ANSIG *base, int count) |
777 | signals_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 | |
790 | static void |
788 | /*****************************************************************************/ |
791 | sighandler (int signum) |
|
|
792 | { |
|
|
793 | #if _WIN32 |
|
|
794 | signal (signum, sighandler); |
|
|
795 | #endif |
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|
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 | } |
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|
807 | |
|
|
808 | void noinline |
|
|
809 | ev_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)); |
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|
815 | #endif |
|
|
816 | |
|
|
817 | --signum; |
|
|
818 | |
|
|
819 | if (signum < 0 || signum >= signalmax) |
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|
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 | |
|
|
828 | static void |
|
|
829 | sigcb (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--; ) |
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|
837 | if (signals [signum].gotsig) |
|
|
838 | ev_feed_signal_event (EV_A_ signum + 1); |
|
|
839 | } |
|
|
840 | |
789 | |
841 | void inline_speed |
790 | void inline_speed |
842 | fd_intern (int fd) |
791 | fd_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 | |
853 | static void noinline |
802 | static void noinline |
854 | siginit (EV_P) |
803 | evpipe_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 | |
|
|
819 | void inline_size |
|
|
820 | evpipe_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 | |
|
|
834 | static void |
|
|
835 | pipecb (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) |
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|
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 | } |
|
|
864 | } |
|
|
865 | |
|
|
866 | /*****************************************************************************/ |
|
|
867 | |
|
|
868 | static void |
|
|
869 | sighandler (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 | |
|
|
883 | void noinline |
|
|
884 | ev_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); |
862 | } |
901 | } |
863 | |
902 | |
864 | /*****************************************************************************/ |
903 | /*****************************************************************************/ |
865 | |
904 | |
866 | static WL childs [EV_PID_HASHSIZE]; |
905 | static WL childs [EV_PID_HASHSIZE]; |
… | |
… | |
1084 | #endif |
1123 | #endif |
1085 | #if EV_USE_SELECT |
1124 | #if EV_USE_SELECT |
1086 | if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags); |
1125 | if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags); |
1087 | #endif |
1126 | #endif |
1088 | |
1127 | |
1089 | ev_init (&sigev, sigcb); |
1128 | ev_init (&pipeev, pipecb); |
1090 | ev_set_priority (&sigev, EV_MAXPRI); |
1129 | ev_set_priority (&pipeev, EV_MAXPRI); |
1091 | } |
1130 | } |
1092 | } |
1131 | } |
1093 | |
1132 | |
1094 | static void noinline |
1133 | static void noinline |
1095 | loop_destroy (EV_P) |
1134 | loop_destroy (EV_P) |
1096 | { |
1135 | { |
1097 | 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 | } |
1098 | |
1146 | |
1099 | #if EV_USE_INOTIFY |
1147 | #if EV_USE_INOTIFY |
1100 | if (fs_fd >= 0) |
1148 | if (fs_fd >= 0) |
1101 | close (fs_fd); |
1149 | close (fs_fd); |
1102 | #endif |
1150 | #endif |
… | |
… | |
1161 | #endif |
1209 | #endif |
1162 | #if EV_USE_INOTIFY |
1210 | #if EV_USE_INOTIFY |
1163 | infy_fork (EV_A); |
1211 | infy_fork (EV_A); |
1164 | #endif |
1212 | #endif |
1165 | |
1213 | |
1166 | if (ev_is_active (&sigev)) |
1214 | if (ev_is_active (&pipeev)) |
1167 | { |
1215 | { |
1168 | /* default loop */ |
1216 | /* this "locks" the handlers against writing to the pipe */ |
|
|
1217 | gotsig = gotasync = 1; |
1169 | |
1218 | |
1170 | ev_ref (EV_A); |
1219 | ev_ref (EV_A); |
1171 | ev_io_stop (EV_A_ &sigev); |
1220 | ev_io_stop (EV_A_ &pipeev); |
1172 | close (sigpipe [0]); |
1221 | close (evpipe [0]); |
1173 | close (sigpipe [1]); |
1222 | close (evpipe [1]); |
1174 | |
1223 | |
1175 | while (pipe (sigpipe)) |
|
|
1176 | syserr ("(libev) error creating pipe"); |
|
|
1177 | |
|
|
1178 | siginit (EV_A); |
1224 | evpipe_init (EV_A); |
|
|
1225 | /* now iterate over everything */ |
1179 | sigcb (EV_A_ &sigev, EV_READ); |
1226 | evcb (EV_A_ &pipeev, EV_READ); |
1180 | } |
1227 | } |
1181 | |
1228 | |
1182 | postfork = 0; |
1229 | postfork = 0; |
1183 | } |
1230 | } |
1184 | |
1231 | |
… | |
… | |
1219 | #else |
1266 | #else |
1220 | int |
1267 | int |
1221 | ev_default_loop (unsigned int flags) |
1268 | ev_default_loop (unsigned int flags) |
1222 | #endif |
1269 | #endif |
1223 | { |
1270 | { |
1224 | if (sigpipe [0] == sigpipe [1]) |
|
|
1225 | if (pipe (sigpipe)) |
|
|
1226 | return 0; |
|
|
1227 | |
|
|
1228 | if (!ev_default_loop_ptr) |
1271 | if (!ev_default_loop_ptr) |
1229 | { |
1272 | { |
1230 | #if EV_MULTIPLICITY |
1273 | #if EV_MULTIPLICITY |
1231 | struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct; |
1274 | struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct; |
1232 | #else |
1275 | #else |
… | |
… | |
1235 | |
1278 | |
1236 | loop_init (EV_A_ flags); |
1279 | loop_init (EV_A_ flags); |
1237 | |
1280 | |
1238 | if (ev_backend (EV_A)) |
1281 | if (ev_backend (EV_A)) |
1239 | { |
1282 | { |
1240 | siginit (EV_A); |
|
|
1241 | |
|
|
1242 | #ifndef _WIN32 |
1283 | #ifndef _WIN32 |
1243 | ev_signal_init (&childev, childcb, SIGCHLD); |
1284 | ev_signal_init (&childev, childcb, SIGCHLD); |
1244 | ev_set_priority (&childev, EV_MAXPRI); |
1285 | ev_set_priority (&childev, EV_MAXPRI); |
1245 | ev_signal_start (EV_A_ &childev); |
1286 | ev_signal_start (EV_A_ &childev); |
1246 | ev_unref (EV_A); /* child watcher should not keep loop alive */ |
1287 | ev_unref (EV_A); /* child watcher should not keep loop alive */ |
… | |
… | |
1262 | |
1303 | |
1263 | #ifndef _WIN32 |
1304 | #ifndef _WIN32 |
1264 | ev_ref (EV_A); /* child watcher */ |
1305 | ev_ref (EV_A); /* child watcher */ |
1265 | ev_signal_stop (EV_A_ &childev); |
1306 | ev_signal_stop (EV_A_ &childev); |
1266 | #endif |
1307 | #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 | |
1308 | |
1274 | loop_destroy (EV_A); |
1309 | loop_destroy (EV_A); |
1275 | } |
1310 | } |
1276 | |
1311 | |
1277 | void |
1312 | void |
… | |
… | |
1864 | #endif |
1899 | #endif |
1865 | if (expect_false (ev_is_active (w))) |
1900 | if (expect_false (ev_is_active (w))) |
1866 | return; |
1901 | return; |
1867 | |
1902 | |
1868 | 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); |
1869 | |
1906 | |
1870 | { |
1907 | { |
1871 | #ifndef _WIN32 |
1908 | #ifndef _WIN32 |
1872 | sigset_t full, prev; |
1909 | sigset_t full, prev; |
1873 | sigfillset (&full); |
1910 | sigfillset (&full); |
… | |
… | |
2387 | |
2424 | |
2388 | ev_stop (EV_A_ (W)w); |
2425 | ev_stop (EV_A_ (W)w); |
2389 | } |
2426 | } |
2390 | #endif |
2427 | #endif |
2391 | |
2428 | |
|
|
2429 | #if EV_ASYNC_ENABLE |
|
|
2430 | void |
|
|
2431 | ev_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 | |
|
|
2443 | void |
|
|
2444 | ev_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 | |
|
|
2459 | void |
|
|
2460 | ev_async_send (EV_P_ ev_async *w) |
|
|
2461 | { |
|
|
2462 | w->sent = 1; |
|
|
2463 | evpipe_write (EV_A_ 0, 1); |
|
|
2464 | } |
|
|
2465 | #endif |
|
|
2466 | |
2392 | /*****************************************************************************/ |
2467 | /*****************************************************************************/ |
2393 | |
2468 | |
2394 | struct ev_once |
2469 | struct ev_once |
2395 | { |
2470 | { |
2396 | ev_io io; |
2471 | ev_io io; |