ViewVC Help
View File | Revision Log | Show Annotations | Download File
/cvs/libev/ev.c
(Generate patch)

Comparing libev/ev.c (file contents):
Revision 1.512 by root, Fri Nov 22 19:54:38 2019 UTC vs.
Revision 1.517 by root, Tue Dec 24 13:52:58 2019 UTC

… …
178# else 178# else
179# undef EV_USE_EVENTFD 179# undef EV_USE_EVENTFD
180# define EV_USE_EVENTFD 0 180# define EV_USE_EVENTFD 0
181# endif 181# endif
182 182
183# if HAVE_SYS_TIMERFD_H
184# ifndef EV_USE_TIMERFD
185# define EV_USE_TIMERFD EV_FEATURE_OS
186# endif
187# else
188# undef EV_USE_TIMERFD
189# define EV_USE_TIMERFD 0
190# endif
191
183#endif 192#endif
184 193
185/* OS X, in its infinite idiocy, actually HARDCODES 194/* OS X, in its infinite idiocy, actually HARDCODES
186 * a limit of 1024 into their select. Where people have brains, 195 * a limit of 1024 into their select. Where people have brains,
187 * OS X engineers apparently have a vacuum. Or maybe they were 196 * OS X engineers apparently have a vacuum. Or maybe they were
… …
381# else 390# else
382# define EV_USE_SIGNALFD 0 391# define EV_USE_SIGNALFD 0
383# endif 392# endif
384#endif 393#endif
385 394
395#ifndef EV_USE_TIMERFD
396# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 8))
397# define EV_USE_TIMERFD EV_FEATURE_OS
398# else
399# define EV_USE_TIMERFD 0
400# endif
401#endif
402
386#if 0 /* debugging */ 403#if 0 /* debugging */
387# define EV_VERIFY 3 404# define EV_VERIFY 3
388# define EV_USE_4HEAP 1 405# define EV_USE_4HEAP 1
389# define EV_HEAP_CACHE_AT 1 406# define EV_HEAP_CACHE_AT 1
390#endif 407#endif
… …
498# define EV_USE_INOTIFY 0 515# define EV_USE_INOTIFY 0
499# endif 516# endif
500#endif 517#endif
501 518
502#if EV_USE_EVENTFD 519#if EV_USE_EVENTFD
503/* our minimum requirement is glibc 2.7 which has the stub, but not the header */ 520/* our minimum requirement is glibc 2.7 which has the stub, but not the full header */
504# include <stdint.h> 521# include <stdint.h>
505# ifndef EFD_NONBLOCK 522# ifndef EFD_NONBLOCK
506# define EFD_NONBLOCK O_NONBLOCK 523# define EFD_NONBLOCK O_NONBLOCK
507# endif 524# endif
508# ifndef EFD_CLOEXEC 525# ifndef EFD_CLOEXEC
… …
514# endif 531# endif
515EV_CPP(extern "C") int (eventfd) (unsigned int initval, int flags); 532EV_CPP(extern "C") int (eventfd) (unsigned int initval, int flags);
516#endif 533#endif
517 534
518#if EV_USE_SIGNALFD 535#if EV_USE_SIGNALFD
519/* our minimum requirement is glibc 2.7 which has the stub, but not the header */ 536/* our minimum requirement is glibc 2.7 which has the stub, but not the full header */
520# include <stdint.h> 537# include <stdint.h>
521# ifndef SFD_NONBLOCK 538# ifndef SFD_NONBLOCK
522# define SFD_NONBLOCK O_NONBLOCK 539# define SFD_NONBLOCK O_NONBLOCK
523# endif 540# endif
524# ifndef SFD_CLOEXEC 541# ifndef SFD_CLOEXEC
… …
526# define SFD_CLOEXEC O_CLOEXEC 543# define SFD_CLOEXEC O_CLOEXEC
527# else 544# else
528# define SFD_CLOEXEC 02000000 545# define SFD_CLOEXEC 02000000
529# endif 546# endif
530# endif 547# endif
531EV_CPP (extern "C") int signalfd (int fd, const sigset_t *mask, int flags); 548EV_CPP (extern "C") int (signalfd) (int fd, const sigset_t *mask, int flags);
532 549
533struct signalfd_siginfo 550struct signalfd_siginfo
534{ 551{
535 uint32_t ssi_signo; 552 uint32_t ssi_signo;
536 char pad[128 - sizeof (uint32_t)]; 553 char pad[128 - sizeof (uint32_t)];
537}; 554};
555#endif
556
557/* for timerfd, libev core requires TFD_TIMER_CANCEL_ON_SET &c */
558#if EV_USE_TIMERFD
559# include <sys/timerfd.h>
560/* timerfd is only used for periodics */
561# if !(defined (TFD_TIMER_CANCEL_ON_SET) && defined (TFD_CLOEXEC) && defined (TFD_NONBLOCK)) || !EV_PERIODIC_ENABLE
562# undef EV_USE_TIMERFD
563# define EV_USE_TIMERFD 0
564# endif
538#endif 565#endif
539 566
540/*****************************************************************************/ 567/*****************************************************************************/
541 568
542#if EV_VERIFY >= 3 569#if EV_VERIFY >= 3
… …
2848 2875
2849#endif 2876#endif
2850 2877
2851/*****************************************************************************/ 2878/*****************************************************************************/
2852 2879
2880#if EV_USE_TIMERFD
2881
2882static void periodics_reschedule (EV_P);
2883
2884static void
2885timerfdcb (EV_P_ ev_io *iow, int revents)
2886{
2887 struct itimerspec its = { 0 };
2888
2889 /* since we can't easily come zup with a (portable) maximum value of time_t,
2890 * we wake up once per month, which hopefully is rare enough to not
2891 * be a problem. */
2892 its.it_value.tv_sec = ev_rt_now + 86400 * 30;
2893 timerfd_settime (timerfd, TFD_TIMER_ABSTIME | TFD_TIMER_CANCEL_ON_SET, &its, 0);
2894
2895 ev_rt_now = ev_time ();
2896 /* periodics_reschedule only needs ev_rt_now */
2897 /* but maybe in the future we want the full treatment. */
2898 /*
2899 now_floor = EV_TS_CONST (0.);
2900 time_update (EV_A_ EV_TSTAMP_HUGE);
2901 */
2902 periodics_reschedule (EV_A);
2903}
2904
2905ecb_noinline ecb_cold
2906static void
2907evtimerfd_init (EV_P)
2908{
2909 if (!ev_is_active (&timerfd_w))
2910 {
2911 timerfd = timerfd_create (CLOCK_REALTIME, TFD_NONBLOCK | TFD_CLOEXEC);
2912
2913 if (timerfd >= 0)
2914 {
2915 fd_intern (timerfd); /* just to be sure */
2916
2917 ev_io_init (&timerfd_w, timerfdcb, timerfd, EV_READ);
2918 ev_set_priority (&timerfd_w, EV_MINPRI);
2919 ev_io_start (EV_A_ &timerfd_w);
2920 ev_unref (EV_A); /* watcher should not keep loop alive */
2921
2922 /* (re-) arm timer */
2923 timerfdcb (EV_A_ 0, 0);
2924 }
2925 }
2926}
2927
2928#endif
2929
2930/*****************************************************************************/
2931
2853#if EV_USE_IOCP 2932#if EV_USE_IOCP
2854# include "ev_iocp.c" 2933# include "ev_iocp.c"
2855#endif 2934#endif
2856#if EV_USE_PORT 2935#if EV_USE_PORT
2857# include "ev_port.c" 2936# include "ev_port.c"
… …
3089 fs_fd = flags & EVFLAG_NOINOTIFY ? -1 : -2; 3168 fs_fd = flags & EVFLAG_NOINOTIFY ? -1 : -2;
3090#endif 3169#endif
3091#if EV_USE_SIGNALFD 3170#if EV_USE_SIGNALFD
3092 sigfd = flags & EVFLAG_SIGNALFD ? -2 : -1; 3171 sigfd = flags & EVFLAG_SIGNALFD ? -2 : -1;
3093#endif 3172#endif
3173#if EV_USE_TIMERFD
3174 timerfd = flags & EVFLAG_NOTIMERFD ? -1 : -2;
3175#endif
3094 3176
3095 if (!(flags & EVBACKEND_MASK)) 3177 if (!(flags & EVBACKEND_MASK))
3096 flags |= ev_recommended_backends (); 3178 flags |= ev_recommended_backends ();
3097 3179
3098#if EV_USE_IOCP 3180#if EV_USE_IOCP
… …
3169 } 3251 }
3170 3252
3171#if EV_USE_SIGNALFD 3253#if EV_USE_SIGNALFD
3172 if (ev_is_active (&sigfd_w)) 3254 if (ev_is_active (&sigfd_w))
3173 close (sigfd); 3255 close (sigfd);
3256#endif
3257
3258#if EV_USE_TIMERFD
3259 if (ev_is_active (&timerfd_w))
3260 close (timerfd);
3174#endif 3261#endif
3175 3262
3176#if EV_USE_INOTIFY 3263#if EV_USE_INOTIFY
3177 if (fs_fd >= 0) 3264 if (fs_fd >= 0)
3178 close (fs_fd); 3265 close (fs_fd);
… …
3271#endif 3358#endif
3272#if EV_USE_INOTIFY 3359#if EV_USE_INOTIFY
3273 infy_fork (EV_A); 3360 infy_fork (EV_A);
3274#endif 3361#endif
3275 3362
3363 if (postfork != 2)
3364 {
3365 #if EV_USE_SIGNALFD
3366 /* surprisingly, nothing needs to be done for signalfd, accoridng to docs, it does the right thing on fork */
3367 #endif
3368
3369 #if EV_USE_TIMERFD
3370 if (ev_is_active (&timerfd_w))
3371 {
3372 ev_ref (EV_A);
3373 ev_io_stop (EV_A_ &timerfd_w);
3374
3375 close (timerfd);
3376 timerfd = -2;
3377
3378 evtimerfd_init (EV_A);
3379 /* reschedule periodics, in case we missed something */
3380 ev_feed_event (EV_A_ &timerfd_w, EV_CUSTOM);
3381 }
3382 #endif
3383
3276#if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE 3384 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
3277 if (ev_is_active (&pipe_w) && postfork != 2) 3385 if (ev_is_active (&pipe_w))
3278 { 3386 {
3279 /* pipe_write_wanted must be false now, so modifying fd vars should be safe */ 3387 /* pipe_write_wanted must be false now, so modifying fd vars should be safe */
3280 3388
3281 ev_ref (EV_A); 3389 ev_ref (EV_A);
3282 ev_io_stop (EV_A_ &pipe_w); 3390 ev_io_stop (EV_A_ &pipe_w);
3283 3391
3284 if (evpipe [0] >= 0) 3392 if (evpipe [0] >= 0)
3285 EV_WIN32_CLOSE_FD (evpipe [0]); 3393 EV_WIN32_CLOSE_FD (evpipe [0]);
3286 3394
3287 evpipe_init (EV_A); 3395 evpipe_init (EV_A);
3288 /* iterate over everything, in case we missed something before */ 3396 /* iterate over everything, in case we missed something before */
3289 ev_feed_event (EV_A_ &pipe_w, EV_CUSTOM); 3397 ev_feed_event (EV_A_ &pipe_w, EV_CUSTOM);
3398 }
3399 #endif
3290 } 3400 }
3291#endif
3292 3401
3293 postfork = 0; 3402 postfork = 0;
3294} 3403}
3295 3404
3296#if EV_MULTIPLICITY 3405#if EV_MULTIPLICITY
… …
3858 3967
3859 /* don't let timeouts decrease the waittime below timeout_blocktime */ 3968 /* don't let timeouts decrease the waittime below timeout_blocktime */
3860 if (ecb_expect_false (waittime < timeout_blocktime)) 3969 if (ecb_expect_false (waittime < timeout_blocktime))
3861 waittime = timeout_blocktime; 3970 waittime = timeout_blocktime;
3862 3971
3863 /* at this point, we NEED to wait, so we have to ensure */ 3972 /* now there are two more special cases left, either we have
3864 /* to pass a minimum nonzero value to the backend */ 3973 * already-expired timers, so we should not sleep, or we have timers
3974 * that expire very soon, in which case we need to wait for a minimum
3975 * amount of time for some event loop backends.
3976 */
3865 if (ecb_expect_false (waittime < backend_mintime)) 3977 if (ecb_expect_false (waittime < backend_mintime))
3978 waittime = waittime <= EV_TS_CONST (0.)
3979 ? EV_TS_CONST (0.)
3866 waittime = backend_mintime; 3980 : backend_mintime;
3867 3981
3868 /* extra check because io_blocktime is commonly 0 */ 3982 /* extra check because io_blocktime is commonly 0 */
3869 if (ecb_expect_false (io_blocktime)) 3983 if (ecb_expect_false (io_blocktime))
3870 { 3984 {
3871 sleeptime = io_blocktime - (mn_now - prev_mn_now); 3985 sleeptime = io_blocktime - (mn_now - prev_mn_now);
… …
4206void 4320void
4207ev_periodic_start (EV_P_ ev_periodic *w) EV_NOEXCEPT 4321ev_periodic_start (EV_P_ ev_periodic *w) EV_NOEXCEPT
4208{ 4322{
4209 if (ecb_expect_false (ev_is_active (w))) 4323 if (ecb_expect_false (ev_is_active (w)))
4210 return; 4324 return;
4325
4326#if EV_USE_TIMERFD
4327 if (timerfd == -2)
4328 evtimerfd_init (EV_A);
4329#endif
4211 4330
4212 if (w->reschedule_cb) 4331 if (w->reschedule_cb)
4213 ev_at (w) = w->reschedule_cb (w, ev_rt_now); 4332 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
4214 else if (w->interval) 4333 else if (w->interval)
4215 { 4334 {
… …
4957 ev_run (EV_A_ EVRUN_NOWAIT); 5076 ev_run (EV_A_ EVRUN_NOWAIT);
4958 } 5077 }
4959 } 5078 }
4960} 5079}
4961 5080
5081#if EV_FORK_ENABLE
4962static void 5082static void
4963embed_fork_cb (EV_P_ ev_fork *fork_w, int revents) 5083embed_fork_cb (EV_P_ ev_fork *fork_w, int revents)
4964{ 5084{
4965 ev_embed *w = (ev_embed *)(((char *)fork_w) - offsetof (ev_embed, fork)); 5085 ev_embed *w = (ev_embed *)(((char *)fork_w) - offsetof (ev_embed, fork));
4966 5086
… …
4973 ev_run (EV_A_ EVRUN_NOWAIT); 5093 ev_run (EV_A_ EVRUN_NOWAIT);
4974 } 5094 }
4975 5095
4976 ev_embed_start (EV_A_ w); 5096 ev_embed_start (EV_A_ w);
4977} 5097}
5098#endif
4978 5099
4979#if 0 5100#if 0
4980static void 5101static void
4981embed_idle_cb (EV_P_ ev_idle *idle, int revents) 5102embed_idle_cb (EV_P_ ev_idle *idle, int revents)
4982{ 5103{
… …
5003 5124
5004 ev_prepare_init (&w->prepare, embed_prepare_cb); 5125 ev_prepare_init (&w->prepare, embed_prepare_cb);
5005 ev_set_priority (&w->prepare, EV_MINPRI); 5126 ev_set_priority (&w->prepare, EV_MINPRI);
5006 ev_prepare_start (EV_A_ &w->prepare); 5127 ev_prepare_start (EV_A_ &w->prepare);
5007 5128
5129#if EV_FORK_ENABLE
5008 ev_fork_init (&w->fork, embed_fork_cb); 5130 ev_fork_init (&w->fork, embed_fork_cb);
5009 ev_fork_start (EV_A_ &w->fork); 5131 ev_fork_start (EV_A_ &w->fork);
5132#endif
5010 5133
5011 /*ev_idle_init (&w->idle, e,bed_idle_cb);*/ 5134 /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
5012 5135
5013 ev_start (EV_A_ (W)w, 1); 5136 ev_start (EV_A_ (W)w, 1);
5014 5137
… …
5024 5147
5025 EV_FREQUENT_CHECK; 5148 EV_FREQUENT_CHECK;
5026 5149
5027 ev_io_stop (EV_A_ &w->io); 5150 ev_io_stop (EV_A_ &w->io);
5028 ev_prepare_stop (EV_A_ &w->prepare); 5151 ev_prepare_stop (EV_A_ &w->prepare);
5152#if EV_FORK_ENABLE
5029 ev_fork_stop (EV_A_ &w->fork); 5153 ev_fork_stop (EV_A_ &w->fork);
5154#endif
5030 5155
5031 ev_stop (EV_A_ (W)w); 5156 ev_stop (EV_A_ (W)w);
5032 5157
5033 EV_FREQUENT_CHECK; 5158 EV_FREQUENT_CHECK;
5034} 5159}

Diff Legend

– Removed lines
+ Added lines
< Changed lines
> Changed lines