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Comparing libev/ev.c (file contents):
Revision 1.317 by root, Sat Nov 14 00:15:21 2009 UTC vs.
Revision 1.328 by root, Sun Feb 14 19:23:19 2010 UTC

1/* 1/*
2 * libev event processing core, watcher management 2 * libev event processing core, watcher management
3 * 3 *
4 * Copyright (c) 2007,2008,2009 Marc Alexander Lehmann <libev@schmorp.de> 4 * Copyright (c) 2007,2008,2009,2010 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 *
110# define EV_USE_EPOLL 0 110# define EV_USE_EPOLL 0
111# endif 111# endif
112# endif 112# endif
113 113
114# ifndef EV_USE_KQUEUE 114# ifndef EV_USE_KQUEUE
115# if HAVE_KQUEUE && HAVE_SYS_EVENT_H && HAVE_SYS_QUEUE_H 115# if HAVE_KQUEUE && HAVE_SYS_EVENT_H
116# define EV_USE_KQUEUE 1 116# define EV_USE_KQUEUE 1
117# else 117# else
118# define EV_USE_KQUEUE 0 118# define EV_USE_KQUEUE 0
119# endif 119# endif
120# endif 120# endif
153 153
154#endif 154#endif
155 155
156#include <math.h> 156#include <math.h>
157#include <stdlib.h> 157#include <stdlib.h>
158#include <string.h>
158#include <fcntl.h> 159#include <fcntl.h>
159#include <stddef.h> 160#include <stddef.h>
160 161
161#include <stdio.h> 162#include <stdio.h>
162 163
163#include <assert.h> 164#include <assert.h>
164#include <errno.h> 165#include <errno.h>
165#include <sys/types.h> 166#include <sys/types.h>
166#include <time.h> 167#include <time.h>
168#include <limits.h>
167 169
168#include <signal.h> 170#include <signal.h>
169 171
170#ifdef EV_H 172#ifdef EV_H
171# include EV_H 173# include EV_H
343# endif 345# endif
344#endif 346#endif
345 347
346/* this block fixes any misconfiguration where we know we run into trouble otherwise */ 348/* this block fixes any misconfiguration where we know we run into trouble otherwise */
347 349
350#ifdef _AIX
351/* AIX has a completely broken poll.h header */
352# undef EV_USE_POLL
353# define EV_USE_POLL 0
354#endif
355
348#ifndef CLOCK_MONOTONIC 356#ifndef CLOCK_MONOTONIC
349# undef EV_USE_MONOTONIC 357# undef EV_USE_MONOTONIC
350# define EV_USE_MONOTONIC 0 358# define EV_USE_MONOTONIC 0
351#endif 359#endif
352 360
504 512
505#ifndef EV_FD_TO_WIN32_HANDLE 513#ifndef EV_FD_TO_WIN32_HANDLE
506# define EV_FD_TO_WIN32_HANDLE(fd) _get_osfhandle (fd) 514# define EV_FD_TO_WIN32_HANDLE(fd) _get_osfhandle (fd)
507#endif 515#endif
508#ifndef EV_WIN32_HANDLE_TO_FD 516#ifndef EV_WIN32_HANDLE_TO_FD
509# define EV_WIN32_HANDLE_TO_FD(handle) _open_osfhandle (fd, 0) 517# define EV_WIN32_HANDLE_TO_FD(handle) _open_osfhandle (handle, 0)
510#endif 518#endif
511#ifndef EV_WIN32_CLOSE_FD 519#ifndef EV_WIN32_CLOSE_FD
512# define EV_WIN32_CLOSE_FD(fd) close (fd) 520# define EV_WIN32_CLOSE_FD(fd) close (fd)
513#endif 521#endif
514 522
963/* check whether the given fd is atcually valid, for error recovery */ 971/* check whether the given fd is atcually valid, for error recovery */
964inline_size int 972inline_size int
965fd_valid (int fd) 973fd_valid (int fd)
966{ 974{
967#ifdef _WIN32 975#ifdef _WIN32
968 return _get_osfhandle (fd) != -1; 976 return EV_FD_TO_WIN32_HANDLE (fd) != -1;
969#else 977#else
970 return fcntl (fd, F_GETFD) != -1; 978 return fcntl (fd, F_GETFD) != -1;
971#endif 979#endif
972} 980}
973 981
1178inline_speed void 1186inline_speed void
1179fd_intern (int fd) 1187fd_intern (int fd)
1180{ 1188{
1181#ifdef _WIN32 1189#ifdef _WIN32
1182 unsigned long arg = 1; 1190 unsigned long arg = 1;
1183 ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg); 1191 ioctlsocket (EV_FD_TO_WIN32_HANDLE (fd), FIONBIO, &arg);
1184#else 1192#else
1185 fcntl (fd, F_SETFD, FD_CLOEXEC); 1193 fcntl (fd, F_SETFD, FD_CLOEXEC);
1186 fcntl (fd, F_SETFL, O_NONBLOCK); 1194 fcntl (fd, F_SETFL, O_NONBLOCK);
1187#endif 1195#endif
1188} 1196}
1293{ 1301{
1294#if EV_MULTIPLICITY 1302#if EV_MULTIPLICITY
1295 EV_P = signals [signum - 1].loop; 1303 EV_P = signals [signum - 1].loop;
1296#endif 1304#endif
1297 1305
1298#if _WIN32 1306#ifdef _WIN32
1299 signal (signum, ev_sighandler); 1307 signal (signum, ev_sighandler);
1300#endif 1308#endif
1301 1309
1302 signals [signum - 1].pending = 1; 1310 signals [signum - 1].pending = 1;
1303 evpipe_write (EV_A_ &sig_pending); 1311 evpipe_write (EV_A_ &sig_pending);
1604#endif 1612#endif
1605#if EV_USE_INOTIFY 1613#if EV_USE_INOTIFY
1606 fs_fd = flags & EVFLAG_NOINOTIFY ? -1 : -2; 1614 fs_fd = flags & EVFLAG_NOINOTIFY ? -1 : -2;
1607#endif 1615#endif
1608#if EV_USE_SIGNALFD 1616#if EV_USE_SIGNALFD
1609 sigfd = flags & EVFLAG_NOSIGFD ? -1 : -2; 1617 sigfd = flags & EVFLAG_SIGNALFD ? -2 : -1;
1610#endif 1618#endif
1611 1619
1612 if (!(flags & 0x0000ffffU)) 1620 if (!(flags & 0x0000ffffU))
1613 flags |= ev_recommended_backends (); 1621 flags |= ev_recommended_backends ();
1614 1622
2156 ANHE_at_cache (*he); 2164 ANHE_at_cache (*he);
2157 } 2165 }
2158} 2166}
2159 2167
2160/* fetch new monotonic and realtime times from the kernel */ 2168/* fetch new monotonic and realtime times from the kernel */
2161/* also detetc if there was a timejump, and act accordingly */ 2169/* also detect if there was a timejump, and act accordingly */
2162inline_speed void 2170inline_speed void
2163time_update (EV_P_ ev_tstamp max_block) 2171time_update (EV_P_ ev_tstamp max_block)
2164{ 2172{
2165#if EV_USE_MONOTONIC 2173#if EV_USE_MONOTONIC
2166 if (expect_true (have_monotonic)) 2174 if (expect_true (have_monotonic))
2500 2508
2501 if (expect_false (ev_is_active (w))) 2509 if (expect_false (ev_is_active (w)))
2502 return; 2510 return;
2503 2511
2504 assert (("libev: ev_io_start called with negative fd", fd >= 0)); 2512 assert (("libev: ev_io_start called with negative fd", fd >= 0));
2505 assert (("libev: ev_io start called with illegal event mask", !(w->events & ~(EV__IOFDSET | EV_READ | EV_WRITE)))); 2513 assert (("libev: ev_io_start called with illegal event mask", !(w->events & ~(EV__IOFDSET | EV_READ | EV_WRITE))));
2506 2514
2507 EV_FREQUENT_CHECK; 2515 EV_FREQUENT_CHECK;
2508 2516
2509 ev_start (EV_A_ (W)w, 1); 2517 ev_start (EV_A_ (W)w, 1);
2510 array_needsize (ANFD, anfds, anfdmax, fd + 1, array_init_zero); 2518 array_needsize (ANFD, anfds, anfdmax, fd + 1, array_init_zero);
2580 timers [active] = timers [timercnt + HEAP0]; 2588 timers [active] = timers [timercnt + HEAP0];
2581 adjustheap (timers, timercnt, active); 2589 adjustheap (timers, timercnt, active);
2582 } 2590 }
2583 } 2591 }
2584 2592
2585 EV_FREQUENT_CHECK;
2586
2587 ev_at (w) -= mn_now; 2593 ev_at (w) -= mn_now;
2588 2594
2589 ev_stop (EV_A_ (W)w); 2595 ev_stop (EV_A_ (W)w);
2596
2597 EV_FREQUENT_CHECK;
2590} 2598}
2591 2599
2592void noinline 2600void noinline
2593ev_timer_again (EV_P_ ev_timer *w) 2601ev_timer_again (EV_P_ ev_timer *w)
2594{ 2602{
2673 periodics [active] = periodics [periodiccnt + HEAP0]; 2681 periodics [active] = periodics [periodiccnt + HEAP0];
2674 adjustheap (periodics, periodiccnt, active); 2682 adjustheap (periodics, periodiccnt, active);
2675 } 2683 }
2676 } 2684 }
2677 2685
2678 EV_FREQUENT_CHECK;
2679
2680 ev_stop (EV_A_ (W)w); 2686 ev_stop (EV_A_ (W)w);
2687
2688 EV_FREQUENT_CHECK;
2681} 2689}
2682 2690
2683void noinline 2691void noinline
2684ev_periodic_again (EV_P_ ev_periodic *w) 2692ev_periodic_again (EV_P_ ev_periodic *w)
2685{ 2693{
2746 if (!((WL)w)->next) 2754 if (!((WL)w)->next)
2747# if EV_USE_SIGNALFD 2755# if EV_USE_SIGNALFD
2748 if (sigfd < 0) /*TODO*/ 2756 if (sigfd < 0) /*TODO*/
2749# endif 2757# endif
2750 { 2758 {
2751# if _WIN32 2759# ifdef _WIN32
2752 evpipe_init (EV_A); 2760 evpipe_init (EV_A);
2753 2761
2754 signal (w->signum, ev_sighandler); 2762 signal (w->signum, ev_sighandler);
2755# else 2763# else
2756 struct sigaction sa; 2764 struct sigaction sa;
2789 signals [w->signum - 1].loop = 0; /* unattach from signal */ 2797 signals [w->signum - 1].loop = 0; /* unattach from signal */
2790#endif 2798#endif
2791#if EV_USE_SIGNALFD 2799#if EV_USE_SIGNALFD
2792 if (sigfd >= 0) 2800 if (sigfd >= 0)
2793 { 2801 {
2794 sigprocmask (SIG_UNBLOCK, &sigfd_set, 0);//D 2802 sigset_t ss;
2803
2804 sigemptyset (&ss);
2805 sigaddset (&ss, w->signum);
2795 sigdelset (&sigfd_set, w->signum); 2806 sigdelset (&sigfd_set, w->signum);
2807
2796 signalfd (sigfd, &sigfd_set, 0); 2808 signalfd (sigfd, &sigfd_set, 0);
2797 sigprocmask (SIG_BLOCK, &sigfd_set, 0);//D 2809 sigprocmask (SIG_UNBLOCK, &ss, 0);
2798 /*TODO: maybe unblock signal? */
2799 } 2810 }
2800 else 2811 else
2801#endif 2812#endif
2802 signal (w->signum, SIG_DFL); 2813 signal (w->signum, SIG_DFL);
2803 } 2814 }
2849#define MIN_STAT_INTERVAL 0.1074891 2860#define MIN_STAT_INTERVAL 0.1074891
2850 2861
2851static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents); 2862static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
2852 2863
2853#if EV_USE_INOTIFY 2864#if EV_USE_INOTIFY
2854# define EV_INOTIFY_BUFSIZE 8192 2865
2866/* the * 2 is to allow for alignment padding, which for some reason is >> 8 */
2867# define EV_INOTIFY_BUFSIZE (sizeof (struct inotify_event) * 2 + NAME_MAX)
2855 2868
2856static void noinline 2869static void noinline
2857infy_add (EV_P_ ev_stat *w) 2870infy_add (EV_P_ ev_stat *w)
2858{ 2871{
2859 w->wd = inotify_add_watch (fs_fd, w->path, IN_ATTRIB | IN_DELETE_SELF | IN_MOVE_SELF | IN_MODIFY | IN_DONT_FOLLOW | IN_MASK_ADD); 2872 w->wd = inotify_add_watch (fs_fd, w->path, IN_ATTRIB | IN_DELETE_SELF | IN_MOVE_SELF | IN_MODIFY | IN_DONT_FOLLOW | IN_MASK_ADD);
2860 2873
2861 if (w->wd < 0) 2874 if (w->wd >= 0)
2875 {
2876 struct statfs sfs;
2877
2878 /* now local changes will be tracked by inotify, but remote changes won't */
2879 /* unless the filesystem is known to be local, we therefore still poll */
2880 /* also do poll on <2.6.25, but with normal frequency */
2881
2882 if (!fs_2625)
2883 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
2884 else if (!statfs (w->path, &sfs)
2885 && (sfs.f_type == 0x1373 /* devfs */
2886 || sfs.f_type == 0xEF53 /* ext2/3 */
2887 || sfs.f_type == 0x3153464a /* jfs */
2888 || sfs.f_type == 0x52654973 /* reiser3 */
2889 || sfs.f_type == 0x01021994 /* tempfs */
2890 || sfs.f_type == 0x58465342 /* xfs */))
2891 w->timer.repeat = 0.; /* filesystem is local, kernel new enough */
2892 else
2893 w->timer.repeat = w->interval ? w->interval : NFS_STAT_INTERVAL; /* remote, use reduced frequency */
2862 { 2894 }
2895 else
2896 {
2897 /* can't use inotify, continue to stat */
2863 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL; 2898 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
2864 ev_timer_again (EV_A_ &w->timer); /* this is not race-free, so we still need to recheck periodically */
2865 2899
2866 /* monitor some parent directory for speedup hints */ 2900 /* if path is not there, monitor some parent directory for speedup hints */
2867 /* note that exceeding the hardcoded path limit is not a correctness issue, */ 2901 /* note that exceeding the hardcoded path limit is not a correctness issue, */
2868 /* but an efficiency issue only */ 2902 /* but an efficiency issue only */
2869 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096) 2903 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
2870 { 2904 {
2871 char path [4096]; 2905 char path [4096];
2887 while (w->wd < 0 && (errno == ENOENT || errno == EACCES)); 2921 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
2888 } 2922 }
2889 } 2923 }
2890 2924
2891 if (w->wd >= 0) 2925 if (w->wd >= 0)
2892 {
2893 struct statfs sfs;
2894
2895 wlist_add (&fs_hash [w->wd & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w); 2926 wlist_add (&fs_hash [w->wd & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
2896 2927
2897 /* now local changes will be tracked by inotify, but remote changes won't */ 2928 /* now re-arm timer, if required */
2898 /* unless the filesystem is known to be local, we therefore still poll */ 2929 if (ev_is_active (&w->timer)) ev_ref (EV_A);
2899 /* also do poll on <2.6.25, but with normal frequency */
2900
2901 if (fs_2625 && !statfs (w->path, &sfs))
2902 if (sfs.f_type == 0x1373 /* devfs */
2903 || sfs.f_type == 0xEF53 /* ext2/3 */
2904 || sfs.f_type == 0x3153464a /* jfs */
2905 || sfs.f_type == 0x52654973 /* reiser3 */
2906 || sfs.f_type == 0x01021994 /* tempfs */
2907 || sfs.f_type == 0x58465342 /* xfs */)
2908 return;
2909
2910 w->timer.repeat = w->interval ? w->interval : fs_2625 ? NFS_STAT_INTERVAL : DEF_STAT_INTERVAL;
2911 ev_timer_again (EV_A_ &w->timer); 2930 ev_timer_again (EV_A_ &w->timer);
2912 } 2931 if (ev_is_active (&w->timer)) ev_unref (EV_A);
2913} 2932}
2914 2933
2915static void noinline 2934static void noinline
2916infy_del (EV_P_ ev_stat *w) 2935infy_del (EV_P_ ev_stat *w)
2917{ 2936{
2962 2981
2963static void 2982static void
2964infy_cb (EV_P_ ev_io *w, int revents) 2983infy_cb (EV_P_ ev_io *w, int revents)
2965{ 2984{
2966 char buf [EV_INOTIFY_BUFSIZE]; 2985 char buf [EV_INOTIFY_BUFSIZE];
2967 struct inotify_event *ev = (struct inotify_event *)buf;
2968 int ofs; 2986 int ofs;
2969 int len = read (fs_fd, buf, sizeof (buf)); 2987 int len = read (fs_fd, buf, sizeof (buf));
2970 2988
2971 for (ofs = 0; ofs < len; ofs += sizeof (struct inotify_event) + ev->len) 2989 for (ofs = 0; ofs < len; )
2990 {
2991 struct inotify_event *ev = (struct inotify_event *)(buf + ofs);
2972 infy_wd (EV_A_ ev->wd, ev->wd, ev); 2992 infy_wd (EV_A_ ev->wd, ev->wd, ev);
2993 ofs += sizeof (struct inotify_event) + ev->len;
2994 }
2973} 2995}
2974 2996
2975inline_size void 2997inline_size void
2976check_2625 (EV_P) 2998check_2625 (EV_P)
2977{ 2999{
3062 w->wd = -1; 3084 w->wd = -1;
3063 3085
3064 if (fs_fd >= 0) 3086 if (fs_fd >= 0)
3065 infy_add (EV_A_ w); /* re-add, no matter what */ 3087 infy_add (EV_A_ w); /* re-add, no matter what */
3066 else 3088 else
3089 {
3090 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3091 if (ev_is_active (&w->timer)) ev_ref (EV_A);
3067 ev_timer_again (EV_A_ &w->timer); 3092 ev_timer_again (EV_A_ &w->timer);
3093 if (ev_is_active (&w->timer)) ev_unref (EV_A);
3094 }
3068 } 3095 }
3069 } 3096 }
3070} 3097}
3071 3098
3072#endif 3099#endif
3089static void noinline 3116static void noinline
3090stat_timer_cb (EV_P_ ev_timer *w_, int revents) 3117stat_timer_cb (EV_P_ ev_timer *w_, int revents)
3091{ 3118{
3092 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer)); 3119 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
3093 3120
3094 /* we copy this here each the time so that */ 3121 ev_statdata prev = w->attr;
3095 /* prev has the old value when the callback gets invoked */
3096 w->prev = w->attr;
3097 ev_stat_stat (EV_A_ w); 3122 ev_stat_stat (EV_A_ w);
3098 3123
3099 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */ 3124 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
3100 if ( 3125 if (
3101 w->prev.st_dev != w->attr.st_dev 3126 prev.st_dev != w->attr.st_dev
3102 || w->prev.st_ino != w->attr.st_ino 3127 || prev.st_ino != w->attr.st_ino
3103 || w->prev.st_mode != w->attr.st_mode 3128 || prev.st_mode != w->attr.st_mode
3104 || w->prev.st_nlink != w->attr.st_nlink 3129 || prev.st_nlink != w->attr.st_nlink
3105 || w->prev.st_uid != w->attr.st_uid 3130 || prev.st_uid != w->attr.st_uid
3106 || w->prev.st_gid != w->attr.st_gid 3131 || prev.st_gid != w->attr.st_gid
3107 || w->prev.st_rdev != w->attr.st_rdev 3132 || prev.st_rdev != w->attr.st_rdev
3108 || w->prev.st_size != w->attr.st_size 3133 || prev.st_size != w->attr.st_size
3109 || w->prev.st_atime != w->attr.st_atime 3134 || prev.st_atime != w->attr.st_atime
3110 || w->prev.st_mtime != w->attr.st_mtime 3135 || prev.st_mtime != w->attr.st_mtime
3111 || w->prev.st_ctime != w->attr.st_ctime 3136 || prev.st_ctime != w->attr.st_ctime
3112 ) { 3137 ) {
3138 /* we only update w->prev on actual differences */
3139 /* in case we test more often than invoke the callback, */
3140 /* to ensure that prev is always different to attr */
3141 w->prev = prev;
3142
3113 #if EV_USE_INOTIFY 3143 #if EV_USE_INOTIFY
3114 if (fs_fd >= 0) 3144 if (fs_fd >= 0)
3115 { 3145 {
3116 infy_del (EV_A_ w); 3146 infy_del (EV_A_ w);
3117 infy_add (EV_A_ w); 3147 infy_add (EV_A_ w);
3142 3172
3143 if (fs_fd >= 0) 3173 if (fs_fd >= 0)
3144 infy_add (EV_A_ w); 3174 infy_add (EV_A_ w);
3145 else 3175 else
3146#endif 3176#endif
3177 {
3147 ev_timer_again (EV_A_ &w->timer); 3178 ev_timer_again (EV_A_ &w->timer);
3179 ev_unref (EV_A);
3180 }
3148 3181
3149 ev_start (EV_A_ (W)w, 1); 3182 ev_start (EV_A_ (W)w, 1);
3150 3183
3151 EV_FREQUENT_CHECK; 3184 EV_FREQUENT_CHECK;
3152} 3185}
3161 EV_FREQUENT_CHECK; 3194 EV_FREQUENT_CHECK;
3162 3195
3163#if EV_USE_INOTIFY 3196#if EV_USE_INOTIFY
3164 infy_del (EV_A_ w); 3197 infy_del (EV_A_ w);
3165#endif 3198#endif
3199
3200 if (ev_is_active (&w->timer))
3201 {
3202 ev_ref (EV_A);
3166 ev_timer_stop (EV_A_ &w->timer); 3203 ev_timer_stop (EV_A_ &w->timer);
3204 }
3167 3205
3168 ev_stop (EV_A_ (W)w); 3206 ev_stop (EV_A_ (W)w);
3169 3207
3170 EV_FREQUENT_CHECK; 3208 EV_FREQUENT_CHECK;
3171} 3209}
3390 EV_FREQUENT_CHECK; 3428 EV_FREQUENT_CHECK;
3391 3429
3392 ev_io_stop (EV_A_ &w->io); 3430 ev_io_stop (EV_A_ &w->io);
3393 ev_prepare_stop (EV_A_ &w->prepare); 3431 ev_prepare_stop (EV_A_ &w->prepare);
3394 ev_fork_stop (EV_A_ &w->fork); 3432 ev_fork_stop (EV_A_ &w->fork);
3433
3434 ev_stop (EV_A_ (W)w);
3395 3435
3396 EV_FREQUENT_CHECK; 3436 EV_FREQUENT_CHECK;
3397} 3437}
3398#endif 3438#endif
3399 3439

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