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Comparing libev/ev.c (file contents):
Revision 1.203 by root, Fri Jan 18 11:31:02 2008 UTC vs.
Revision 1.211 by root, Tue Feb 19 17:09:28 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); /* watcher should not keep loop alive */
816
817 /* in case we received the signal before we had the chance of installing a handler */
818 ev_feed_event (EV_A_ &pipeev, 0);
819 }
820}
821
822void inline_size
823evpipe_write (EV_P_ int sig, int async)
824{
825 if (!(gotasync || gotsig))
826 {
827 int old_errno = errno; /* save errno becaue write might clobber it */
828
829 if (sig) gotsig = 1;
830 if (async) gotasync = 1;
831
832 write (evpipe [1], &old_errno, 1);
833
834 errno = old_errno;
835 }
836}
837
838static void
839pipecb (EV_P_ ev_io *iow, int revents)
840{
841 {
842 int dummy;
843 read (evpipe [0], &dummy, 1);
844 }
845
846 if (gotsig && ev_is_default_loop (EV_A))
847 {
848 int signum;
849 gotsig = 0;
850
851 for (signum = signalmax; signum--; )
852 if (signals [signum].gotsig)
853 ev_feed_signal_event (EV_A_ signum + 1);
854 }
855
856#if EV_ASYNC_ENABLE
857 if (gotasync)
858 {
859 int i;
860 gotasync = 0;
861
862 for (i = asynccnt; i--; )
863 if (asyncs [i]->sent)
864 {
865 asyncs [i]->sent = 0;
866 ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
867 }
868 }
869#endif
862} 870}
863 871
864/*****************************************************************************/ 872/*****************************************************************************/
865 873
874static void
875sighandler (int signum)
876{
877#if EV_MULTIPLICITY
878 struct ev_loop *loop = &default_loop_struct;
879#endif
880
881#if _WIN32
882 signal (signum, sighandler);
883#endif
884
885 signals [signum - 1].gotsig = 1;
886 evpipe_write (EV_A_ 1, 0);
887}
888
889void noinline
890ev_feed_signal_event (EV_P_ int signum)
891{
892 WL w;
893
894#if EV_MULTIPLICITY
895 assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
896#endif
897
898 --signum;
899
900 if (signum < 0 || signum >= signalmax)
901 return;
902
903 signals [signum].gotsig = 0;
904
905 for (w = signals [signum].head; w; w = w->next)
906 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
907}
908
909/*****************************************************************************/
910
866static WL childs [EV_PID_HASHSIZE]; 911static WL childs [EV_PID_HASHSIZE];
867 912
868#ifndef _WIN32 913#ifndef _WIN32
869 914
870static ev_signal childev; 915static ev_signal childev;
916
917#ifndef WIFCONTINUED
918# define WIFCONTINUED(status) 0
919#endif
871 920
872void inline_speed 921void inline_speed
873child_reap (EV_P_ ev_signal *sw, int chain, int pid, int status) 922child_reap (EV_P_ ev_signal *sw, int chain, int pid, int status)
874{ 923{
875 ev_child *w; 924 ev_child *w;
925 int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
876 926
877 for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next) 927 for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
928 {
878 if (w->pid == pid || !w->pid) 929 if ((w->pid == pid || !w->pid)
930 && (!traced || (w->flags & 1)))
879 { 931 {
880 ev_set_priority (w, ev_priority (sw)); /* need to do it *now* */ 932 ev_set_priority (w, ev_priority (sw)); /* need to do it *now* */
881 w->rpid = pid; 933 w->rpid = pid;
882 w->rstatus = status; 934 w->rstatus = status;
883 ev_feed_event (EV_A_ (W)w, EV_CHILD); 935 ev_feed_event (EV_A_ (W)w, EV_CHILD);
884 } 936 }
937 }
885} 938}
886 939
887#ifndef WCONTINUED 940#ifndef WCONTINUED
888# define WCONTINUED 0 941# define WCONTINUED 0
889#endif 942#endif
… …
1032 if (!clock_gettime (CLOCK_MONOTONIC, &ts)) 1085 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
1033 have_monotonic = 1; 1086 have_monotonic = 1;
1034 } 1087 }
1035#endif 1088#endif
1036 1089
1037 ev_rt_now = ev_time (); 1090 ev_rt_now = ev_time ();
1038 mn_now = get_clock (); 1091 mn_now = get_clock ();
1039 now_floor = mn_now; 1092 now_floor = mn_now;
1040 rtmn_diff = ev_rt_now - mn_now; 1093 rtmn_diff = ev_rt_now - mn_now;
1041 1094
1042 io_blocktime = 0.; 1095 io_blocktime = 0.;
1043 timeout_blocktime = 0.; 1096 timeout_blocktime = 0.;
1097 backend = 0;
1098 backend_fd = -1;
1099 gotasync = 0;
1100#if EV_USE_INOTIFY
1101 fs_fd = -2;
1102#endif
1044 1103
1045 /* pid check not overridable via env */ 1104 /* pid check not overridable via env */
1046#ifndef _WIN32 1105#ifndef _WIN32
1047 if (flags & EVFLAG_FORKCHECK) 1106 if (flags & EVFLAG_FORKCHECK)
1048 curpid = getpid (); 1107 curpid = getpid ();
… …
1054 flags = atoi (getenv ("LIBEV_FLAGS")); 1113 flags = atoi (getenv ("LIBEV_FLAGS"));
1055 1114
1056 if (!(flags & 0x0000ffffUL)) 1115 if (!(flags & 0x0000ffffUL))
1057 flags |= ev_recommended_backends (); 1116 flags |= ev_recommended_backends ();
1058 1117
1059 backend = 0;
1060 backend_fd = -1;
1061#if EV_USE_INOTIFY
1062 fs_fd = -2;
1063#endif
1064
1065#if EV_USE_PORT 1118#if EV_USE_PORT
1066 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags); 1119 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
1067#endif 1120#endif
1068#if EV_USE_KQUEUE 1121#if EV_USE_KQUEUE
1069 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags); 1122 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
… …
1076#endif 1129#endif
1077#if EV_USE_SELECT 1130#if EV_USE_SELECT
1078 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags); 1131 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
1079#endif 1132#endif
1080 1133
1081 ev_init (&sigev, sigcb); 1134 ev_init (&pipeev, pipecb);
1082 ev_set_priority (&sigev, EV_MAXPRI); 1135 ev_set_priority (&pipeev, EV_MAXPRI);
1083 } 1136 }
1084} 1137}
1085 1138
1086static void noinline 1139static void noinline
1087loop_destroy (EV_P) 1140loop_destroy (EV_P)
1088{ 1141{
1089 int i; 1142 int i;
1143
1144 if (ev_is_active (&pipeev))
1145 {
1146 ev_ref (EV_A); /* signal watcher */
1147 ev_io_stop (EV_A_ &pipeev);
1148
1149 close (evpipe [0]); evpipe [0] = 0;
1150 close (evpipe [1]); evpipe [1] = 0;
1151 }
1090 1152
1091#if EV_USE_INOTIFY 1153#if EV_USE_INOTIFY
1092 if (fs_fd >= 0) 1154 if (fs_fd >= 0)
1093 close (fs_fd); 1155 close (fs_fd);
1094#endif 1156#endif
… …
1131#if EV_FORK_ENABLE 1193#if EV_FORK_ENABLE
1132 array_free (fork, EMPTY); 1194 array_free (fork, EMPTY);
1133#endif 1195#endif
1134 array_free (prepare, EMPTY); 1196 array_free (prepare, EMPTY);
1135 array_free (check, EMPTY); 1197 array_free (check, EMPTY);
1198#if EV_ASYNC_ENABLE
1199 array_free (async, EMPTY);
1200#endif
1136 1201
1137 backend = 0; 1202 backend = 0;
1138} 1203}
1139 1204
1140void inline_size infy_fork (EV_P); 1205void inline_size infy_fork (EV_P);
… …
1153#endif 1218#endif
1154#if EV_USE_INOTIFY 1219#if EV_USE_INOTIFY
1155 infy_fork (EV_A); 1220 infy_fork (EV_A);
1156#endif 1221#endif
1157 1222
1158 if (ev_is_active (&sigev)) 1223 if (ev_is_active (&pipeev))
1159 { 1224 {
1160 /* default loop */ 1225 /* this "locks" the handlers against writing to the pipe */
1226 gotsig = gotasync = 1;
1161 1227
1162 ev_ref (EV_A); 1228 ev_ref (EV_A);
1163 ev_io_stop (EV_A_ &sigev); 1229 ev_io_stop (EV_A_ &pipeev);
1164 close (sigpipe [0]); 1230 close (evpipe [0]);
1165 close (sigpipe [1]); 1231 close (evpipe [1]);
1166 1232
1167 while (pipe (sigpipe))
1168 syserr ("(libev) error creating pipe");
1169
1170 siginit (EV_A); 1233 evpipe_init (EV_A);
1234 /* now iterate over everything, in case we missed something */
1171 sigcb (EV_A_ &sigev, EV_READ); 1235 pipecb (EV_A_ &pipeev, EV_READ);
1172 } 1236 }
1173 1237
1174 postfork = 0; 1238 postfork = 0;
1175} 1239}
1176 1240
… …
1198} 1262}
1199 1263
1200void 1264void
1201ev_loop_fork (EV_P) 1265ev_loop_fork (EV_P)
1202{ 1266{
1203 postfork = 1; 1267 postfork = 1; /* must be in line with ev_default_fork */
1204} 1268}
1205 1269
1206#endif 1270#endif
1207 1271
1208#if EV_MULTIPLICITY 1272#if EV_MULTIPLICITY
… …
1211#else 1275#else
1212int 1276int
1213ev_default_loop (unsigned int flags) 1277ev_default_loop (unsigned int flags)
1214#endif 1278#endif
1215{ 1279{
1216 if (sigpipe [0] == sigpipe [1])
1217 if (pipe (sigpipe))
1218 return 0;
1219
1220 if (!ev_default_loop_ptr) 1280 if (!ev_default_loop_ptr)
1221 { 1281 {
1222#if EV_MULTIPLICITY 1282#if EV_MULTIPLICITY
1223 struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct; 1283 struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
1224#else 1284#else
… …
1227 1287
1228 loop_init (EV_A_ flags); 1288 loop_init (EV_A_ flags);
1229 1289
1230 if (ev_backend (EV_A)) 1290 if (ev_backend (EV_A))
1231 { 1291 {
1232 siginit (EV_A);
1233
1234#ifndef _WIN32 1292#ifndef _WIN32
1235 ev_signal_init (&childev, childcb, SIGCHLD); 1293 ev_signal_init (&childev, childcb, SIGCHLD);
1236 ev_set_priority (&childev, EV_MAXPRI); 1294 ev_set_priority (&childev, EV_MAXPRI);
1237 ev_signal_start (EV_A_ &childev); 1295 ev_signal_start (EV_A_ &childev);
1238 ev_unref (EV_A); /* child watcher should not keep loop alive */ 1296 ev_unref (EV_A); /* child watcher should not keep loop alive */
… …
1255#ifndef _WIN32 1313#ifndef _WIN32
1256 ev_ref (EV_A); /* child watcher */ 1314 ev_ref (EV_A); /* child watcher */
1257 ev_signal_stop (EV_A_ &childev); 1315 ev_signal_stop (EV_A_ &childev);
1258#endif 1316#endif
1259 1317
1260 ev_ref (EV_A); /* signal watcher */
1261 ev_io_stop (EV_A_ &sigev);
1262
1263 close (sigpipe [0]); sigpipe [0] = 0;
1264 close (sigpipe [1]); sigpipe [1] = 0;
1265
1266 loop_destroy (EV_A); 1318 loop_destroy (EV_A);
1267} 1319}
1268 1320
1269void 1321void
1270ev_default_fork (void) 1322ev_default_fork (void)
… …
1272#if EV_MULTIPLICITY 1324#if EV_MULTIPLICITY
1273 struct ev_loop *loop = ev_default_loop_ptr; 1325 struct ev_loop *loop = ev_default_loop_ptr;
1274#endif 1326#endif
1275 1327
1276 if (backend) 1328 if (backend)
1277 postfork = 1; 1329 postfork = 1; /* must be in line with ev_loop_fork */
1278} 1330}
1279 1331
1280/*****************************************************************************/ 1332/*****************************************************************************/
1281 1333
1282void 1334void
… …
1856#endif 1908#endif
1857 if (expect_false (ev_is_active (w))) 1909 if (expect_false (ev_is_active (w)))
1858 return; 1910 return;
1859 1911
1860 assert (("ev_signal_start called with illegal signal number", w->signum > 0)); 1912 assert (("ev_signal_start called with illegal signal number", w->signum > 0));
1913
1914 evpipe_init (EV_A);
1861 1915
1862 { 1916 {
1863#ifndef _WIN32 1917#ifndef _WIN32
1864 sigset_t full, prev; 1918 sigset_t full, prev;
1865 sigfillset (&full); 1919 sigfillset (&full);
… …
2379 2433
2380 ev_stop (EV_A_ (W)w); 2434 ev_stop (EV_A_ (W)w);
2381} 2435}
2382#endif 2436#endif
2383 2437
2438#if EV_ASYNC_ENABLE
2439void
2440ev_async_start (EV_P_ ev_async *w)
2441{
2442 if (expect_false (ev_is_active (w)))
2443 return;
2444
2445 evpipe_init (EV_A);
2446
2447 ev_start (EV_A_ (W)w, ++asynccnt);
2448 array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
2449 asyncs [asynccnt - 1] = w;
2450}
2451
2452void
2453ev_async_stop (EV_P_ ev_async *w)
2454{
2455 clear_pending (EV_A_ (W)w);
2456 if (expect_false (!ev_is_active (w)))
2457 return;
2458
2459 {
2460 int active = ((W)w)->active;
2461 asyncs [active - 1] = asyncs [--asynccnt];
2462 ((W)asyncs [active - 1])->active = active;
2463 }
2464
2465 ev_stop (EV_A_ (W)w);
2466}
2467
2468void
2469ev_async_send (EV_P_ ev_async *w)
2470{
2471 w->sent = 1;
2472 evpipe_write (EV_A_ 0, 1);
2473}
2474#endif
2475
2384/*****************************************************************************/ 2476/*****************************************************************************/
2385 2477
2386struct ev_once 2478struct ev_once
2387{ 2479{
2388 ev_io io; 2480 ev_io io;

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