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 1.519 by root, Sat Dec 28 07:37:07 2019 UTC

… …
117# define EV_USE_EPOLL 0 117# define EV_USE_EPOLL 0
118# endif 118# endif
119 119
120# if HAVE_LINUX_AIO_ABI_H 120# if HAVE_LINUX_AIO_ABI_H
121# ifndef EV_USE_LINUXAIO 121# ifndef EV_USE_LINUXAIO
122# define EV_USE_LINUXAIO EV_FEATURE_BACKENDS 122# define EV_USE_LINUXAIO 0 /* was: EV_FEATURE_BACKENDS, always off by default */
123# endif 123# endif
124# else 124# else
125# undef EV_USE_LINUXAIO 125# undef EV_USE_LINUXAIO
126# define EV_USE_LINUXAIO 0 126# define EV_USE_LINUXAIO 0
127# endif 127# endif
… …
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
… …
335# define EV_USE_PORT 0 344# define EV_USE_PORT 0
336#endif 345#endif
337 346
338#ifndef EV_USE_LINUXAIO 347#ifndef EV_USE_LINUXAIO
339# if __linux /* libev currently assumes linux/aio_abi.h is always available on linux */ 348# if __linux /* libev currently assumes linux/aio_abi.h is always available on linux */
340# define EV_USE_LINUXAIO 1 349# define EV_USE_LINUXAIO 0 /* was: 1, always off by default */
341# else 350# else
342# define EV_USE_LINUXAIO 0 351# define EV_USE_LINUXAIO 0
343# endif 352# endif
344#endif 353#endif
345 354
… …
378#ifndef EV_USE_SIGNALFD 387#ifndef EV_USE_SIGNALFD
379# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7)) 388# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
380# define EV_USE_SIGNALFD EV_FEATURE_OS 389# define EV_USE_SIGNALFD EV_FEATURE_OS
381# else 390# else
382# define EV_USE_SIGNALFD 0 391# define EV_USE_SIGNALFD 0
392# endif
393#endif
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
383# endif 400# endif
384#endif 401#endif
385 402
386#if 0 /* debugging */ 403#if 0 /* debugging */
387# define EV_VERIFY 3 404# define EV_VERIFY 3
… …
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
… …
1631 * our syscalls return < 0, not == -1, on error. which is good 1658 * our syscalls return < 0, not == -1, on error. which is good
1632 * enough for linux aio. 1659 * enough for linux aio.
1633 * TODO: arm is also common nowadays, maybe even mips and x86 1660 * TODO: arm is also common nowadays, maybe even mips and x86
1634 * TODO: after implementing this, it suddenly looks like overkill, but its hard to remove... 1661 * TODO: after implementing this, it suddenly looks like overkill, but its hard to remove...
1635 */ 1662 */
1636#if __GNUC__ && __linux && ECB_AMD64 && !defined __OPTIMIZE_SIZE__ 1663#if __GNUC__ && __linux && ECB_AMD64 && !EV_FEATURE_CODE
1637 /* the costly errno access probably kills this for size optimisation */ 1664 /* the costly errno access probably kills this for size optimisation */
1638 1665
1639 #define ev_syscall(nr,narg,arg1,arg2,arg3,arg4,arg5,arg6) \ 1666 #define ev_syscall(nr,narg,arg1,arg2,arg3,arg4,arg5,arg6) \
1640 ({ \ 1667 ({ \
1641 long res; \ 1668 long res; \
… …
2235inline_size void 2262inline_size void
2236fd_reify (EV_P) 2263fd_reify (EV_P)
2237{ 2264{
2238 int i; 2265 int i;
2239 2266
2267 /* most backends do not modify the fdchanges list in backend_modfiy.
2268 * except io_uring, which has fixed-size buffers which might force us
2269 * to handle events in backend_modify, causing fdchangesd to be amended,
2270 * which could result in an endless loop.
2271 * to avoid this, we do not dynamically handle fds that were added
2272 * during fd_reify. that menas thast for those backends, fdchangecnt
2273 * might be non-zero during poll, which must cause them to not block.
2274 * to not put too much of a burden on other backends, this detail
2275 * needs to be handled in the backend.
2276 */
2277 int changecnt = fdchangecnt;
2278
2240#if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP 2279#if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
2241 for (i = 0; i < fdchangecnt; ++i) 2280 for (i = 0; i < changecnt; ++i)
2242 { 2281 {
2243 int fd = fdchanges [i]; 2282 int fd = fdchanges [i];
2244 ANFD *anfd = anfds + fd; 2283 ANFD *anfd = anfds + fd;
2245 2284
2246 if (anfd->reify & EV__IOFDSET && anfd->head) 2285 if (anfd->reify & EV__IOFDSET && anfd->head)
… …
2260 } 2299 }
2261 } 2300 }
2262 } 2301 }
2263#endif 2302#endif
2264 2303
2265 for (i = 0; i < fdchangecnt; ++i) 2304 for (i = 0; i < changecnt; ++i)
2266 { 2305 {
2267 int fd = fdchanges [i]; 2306 int fd = fdchanges [i];
2268 ANFD *anfd = anfds + fd; 2307 ANFD *anfd = anfds + fd;
2269 ev_io *w; 2308 ev_io *w;
2270 2309
… …
2286 2325
2287 if (o_reify & EV__IOFDSET) 2326 if (o_reify & EV__IOFDSET)
2288 backend_modify (EV_A_ fd, o_events, anfd->events); 2327 backend_modify (EV_A_ fd, o_events, anfd->events);
2289 } 2328 }
2290 2329
2330 /* normally, fdchangecnt hasn't changed. if it has, then new fds have been added.
2331 * this is a rare case (see beginning comment in this function), so we copy them to the
2332 * front and hope the backend handles this case.
2333 */
2334 if (ecb_expect_false (fdchangecnt != changecnt))
2335 memmove (fdchanges, fdchanges + changecnt, (fdchangecnt - changecnt) * sizeof (*fdchanges));
2336
2291 fdchangecnt = 0; 2337 fdchangecnt -= changecnt;
2292} 2338}
2293 2339
2294/* something about the given fd changed */ 2340/* something about the given fd changed */
2295inline_size 2341inline_size
2296void 2342void
… …
2848 2894
2849#endif 2895#endif
2850 2896
2851/*****************************************************************************/ 2897/*****************************************************************************/
2852 2898
2899#if EV_USE_TIMERFD
2900
2901static void periodics_reschedule (EV_P);
2902
2903static void
2904timerfdcb (EV_P_ ev_io *iow, int revents)
2905{
2906 struct itimerspec its = { 0 };
2907
2908 /* since we can't easily come zup with a (portable) maximum value of time_t,
2909 * we wake up once per month, which hopefully is rare enough to not
2910 * be a problem. */
2911 its.it_value.tv_sec = ev_rt_now + 86400 * 30;
2912 timerfd_settime (timerfd, TFD_TIMER_ABSTIME | TFD_TIMER_CANCEL_ON_SET, &its, 0);
2913
2914 ev_rt_now = ev_time ();
2915 /* periodics_reschedule only needs ev_rt_now */
2916 /* but maybe in the future we want the full treatment. */
2917 /*
2918 now_floor = EV_TS_CONST (0.);
2919 time_update (EV_A_ EV_TSTAMP_HUGE);
2920 */
2921 periodics_reschedule (EV_A);
2922}
2923
2924ecb_noinline ecb_cold
2925static void
2926evtimerfd_init (EV_P)
2927{
2928 if (!ev_is_active (&timerfd_w))
2929 {
2930 timerfd = timerfd_create (CLOCK_REALTIME, TFD_NONBLOCK | TFD_CLOEXEC);
2931
2932 if (timerfd >= 0)
2933 {
2934 fd_intern (timerfd); /* just to be sure */
2935
2936 ev_io_init (&timerfd_w, timerfdcb, timerfd, EV_READ);
2937 ev_set_priority (&timerfd_w, EV_MINPRI);
2938 ev_io_start (EV_A_ &timerfd_w);
2939 ev_unref (EV_A); /* watcher should not keep loop alive */
2940
2941 /* (re-) arm timer */
2942 timerfdcb (EV_A_ 0, 0);
2943 }
2944 }
2945}
2946
2947#endif
2948
2949/*****************************************************************************/
2950
2853#if EV_USE_IOCP 2951#if EV_USE_IOCP
2854# include "ev_iocp.c" 2952# include "ev_iocp.c"
2855#endif 2953#endif
2856#if EV_USE_PORT 2954#if EV_USE_PORT
2857# include "ev_port.c" 2955# include "ev_port.c"
… …
3089 fs_fd = flags & EVFLAG_NOINOTIFY ? -1 : -2; 3187 fs_fd = flags & EVFLAG_NOINOTIFY ? -1 : -2;
3090#endif 3188#endif
3091#if EV_USE_SIGNALFD 3189#if EV_USE_SIGNALFD
3092 sigfd = flags & EVFLAG_SIGNALFD ? -2 : -1; 3190 sigfd = flags & EVFLAG_SIGNALFD ? -2 : -1;
3093#endif 3191#endif
3192#if EV_USE_TIMERFD
3193 timerfd = flags & EVFLAG_NOTIMERFD ? -1 : -2;
3194#endif
3094 3195
3095 if (!(flags & EVBACKEND_MASK)) 3196 if (!(flags & EVBACKEND_MASK))
3096 flags |= ev_recommended_backends (); 3197 flags |= ev_recommended_backends ();
3097 3198
3098#if EV_USE_IOCP 3199#if EV_USE_IOCP
… …
3169 } 3270 }
3170 3271
3171#if EV_USE_SIGNALFD 3272#if EV_USE_SIGNALFD
3172 if (ev_is_active (&sigfd_w)) 3273 if (ev_is_active (&sigfd_w))
3173 close (sigfd); 3274 close (sigfd);
3275#endif
3276
3277#if EV_USE_TIMERFD
3278 if (ev_is_active (&timerfd_w))
3279 close (timerfd);
3174#endif 3280#endif
3175 3281
3176#if EV_USE_INOTIFY 3282#if EV_USE_INOTIFY
3177 if (fs_fd >= 0) 3283 if (fs_fd >= 0)
3178 close (fs_fd); 3284 close (fs_fd);
… …
3271#endif 3377#endif
3272#if EV_USE_INOTIFY 3378#if EV_USE_INOTIFY
3273 infy_fork (EV_A); 3379 infy_fork (EV_A);
3274#endif 3380#endif
3275 3381
3382 if (postfork != 2)
3383 {
3384 #if EV_USE_SIGNALFD
3385 /* surprisingly, nothing needs to be done for signalfd, accoridng to docs, it does the right thing on fork */
3386 #endif
3387
3388 #if EV_USE_TIMERFD
3389 if (ev_is_active (&timerfd_w))
3390 {
3391 ev_ref (EV_A);
3392 ev_io_stop (EV_A_ &timerfd_w);
3393
3394 close (timerfd);
3395 timerfd = -2;
3396
3397 evtimerfd_init (EV_A);
3398 /* reschedule periodics, in case we missed something */
3399 ev_feed_event (EV_A_ &timerfd_w, EV_CUSTOM);
3400 }
3401 #endif
3402
3276#if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE 3403 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
3277 if (ev_is_active (&pipe_w) && postfork != 2) 3404 if (ev_is_active (&pipe_w))
3278 { 3405 {
3279 /* pipe_write_wanted must be false now, so modifying fd vars should be safe */ 3406 /* pipe_write_wanted must be false now, so modifying fd vars should be safe */
3280 3407
3281 ev_ref (EV_A); 3408 ev_ref (EV_A);
3282 ev_io_stop (EV_A_ &pipe_w); 3409 ev_io_stop (EV_A_ &pipe_w);
3283 3410
3284 if (evpipe [0] >= 0) 3411 if (evpipe [0] >= 0)
3285 EV_WIN32_CLOSE_FD (evpipe [0]); 3412 EV_WIN32_CLOSE_FD (evpipe [0]);
3286 3413
3287 evpipe_init (EV_A); 3414 evpipe_init (EV_A);
3288 /* iterate over everything, in case we missed something before */ 3415 /* iterate over everything, in case we missed something before */
3289 ev_feed_event (EV_A_ &pipe_w, EV_CUSTOM); 3416 ev_feed_event (EV_A_ &pipe_w, EV_CUSTOM);
3417 }
3418 #endif
3290 } 3419 }
3291#endif
3292 3420
3293 postfork = 0; 3421 postfork = 0;
3294} 3422}
3295 3423
3296#if EV_MULTIPLICITY 3424#if EV_MULTIPLICITY
… …
3858 3986
3859 /* don't let timeouts decrease the waittime below timeout_blocktime */ 3987 /* don't let timeouts decrease the waittime below timeout_blocktime */
3860 if (ecb_expect_false (waittime < timeout_blocktime)) 3988 if (ecb_expect_false (waittime < timeout_blocktime))
3861 waittime = timeout_blocktime; 3989 waittime = timeout_blocktime;
3862 3990
3863 /* at this point, we NEED to wait, so we have to ensure */ 3991 /* now there are two more special cases left, either we have
3864 /* to pass a minimum nonzero value to the backend */ 3992 * already-expired timers, so we should not sleep, or we have timers
3993 * that expire very soon, in which case we need to wait for a minimum
3994 * amount of time for some event loop backends.
3995 */
3865 if (ecb_expect_false (waittime < backend_mintime)) 3996 if (ecb_expect_false (waittime < backend_mintime))
3997 waittime = waittime <= EV_TS_CONST (0.)
3998 ? EV_TS_CONST (0.)
3866 waittime = backend_mintime; 3999 : backend_mintime;
3867 4000
3868 /* extra check because io_blocktime is commonly 0 */ 4001 /* extra check because io_blocktime is commonly 0 */
3869 if (ecb_expect_false (io_blocktime)) 4002 if (ecb_expect_false (io_blocktime))
3870 { 4003 {
3871 sleeptime = io_blocktime - (mn_now - prev_mn_now); 4004 sleeptime = io_blocktime - (mn_now - prev_mn_now);
… …
4206void 4339void
4207ev_periodic_start (EV_P_ ev_periodic *w) EV_NOEXCEPT 4340ev_periodic_start (EV_P_ ev_periodic *w) EV_NOEXCEPT
4208{ 4341{
4209 if (ecb_expect_false (ev_is_active (w))) 4342 if (ecb_expect_false (ev_is_active (w)))
4210 return; 4343 return;
4344
4345#if EV_USE_TIMERFD
4346 if (timerfd == -2)
4347 evtimerfd_init (EV_A);
4348#endif
4211 4349
4212 if (w->reschedule_cb) 4350 if (w->reschedule_cb)
4213 ev_at (w) = w->reschedule_cb (w, ev_rt_now); 4351 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
4214 else if (w->interval) 4352 else if (w->interval)
4215 { 4353 {
… …
4957 ev_run (EV_A_ EVRUN_NOWAIT); 5095 ev_run (EV_A_ EVRUN_NOWAIT);
4958 } 5096 }
4959 } 5097 }
4960} 5098}
4961 5099
5100#if EV_FORK_ENABLE
4962static void 5101static void
4963embed_fork_cb (EV_P_ ev_fork *fork_w, int revents) 5102embed_fork_cb (EV_P_ ev_fork *fork_w, int revents)
4964{ 5103{
4965 ev_embed *w = (ev_embed *)(((char *)fork_w) - offsetof (ev_embed, fork)); 5104 ev_embed *w = (ev_embed *)(((char *)fork_w) - offsetof (ev_embed, fork));
4966 5105
… …
4973 ev_run (EV_A_ EVRUN_NOWAIT); 5112 ev_run (EV_A_ EVRUN_NOWAIT);
4974 } 5113 }
4975 5114
4976 ev_embed_start (EV_A_ w); 5115 ev_embed_start (EV_A_ w);
4977} 5116}
5117#endif
4978 5118
4979#if 0 5119#if 0
4980static void 5120static void
4981embed_idle_cb (EV_P_ ev_idle *idle, int revents) 5121embed_idle_cb (EV_P_ ev_idle *idle, int revents)
4982{ 5122{
… …
5003 5143
5004 ev_prepare_init (&w->prepare, embed_prepare_cb); 5144 ev_prepare_init (&w->prepare, embed_prepare_cb);
5005 ev_set_priority (&w->prepare, EV_MINPRI); 5145 ev_set_priority (&w->prepare, EV_MINPRI);
5006 ev_prepare_start (EV_A_ &w->prepare); 5146 ev_prepare_start (EV_A_ &w->prepare);
5007 5147
5148#if EV_FORK_ENABLE
5008 ev_fork_init (&w->fork, embed_fork_cb); 5149 ev_fork_init (&w->fork, embed_fork_cb);
5009 ev_fork_start (EV_A_ &w->fork); 5150 ev_fork_start (EV_A_ &w->fork);
5151#endif
5010 5152
5011 /*ev_idle_init (&w->idle, e,bed_idle_cb);*/ 5153 /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
5012 5154
5013 ev_start (EV_A_ (W)w, 1); 5155 ev_start (EV_A_ (W)w, 1);
5014 5156
… …
5024 5166
5025 EV_FREQUENT_CHECK; 5167 EV_FREQUENT_CHECK;
5026 5168
5027 ev_io_stop (EV_A_ &w->io); 5169 ev_io_stop (EV_A_ &w->io);
5028 ev_prepare_stop (EV_A_ &w->prepare); 5170 ev_prepare_stop (EV_A_ &w->prepare);
5171#if EV_FORK_ENABLE
5029 ev_fork_stop (EV_A_ &w->fork); 5172 ev_fork_stop (EV_A_ &w->fork);
5173#endif
5030 5174
5031 ev_stop (EV_A_ (W)w); 5175 ev_stop (EV_A_ (W)w);
5032 5176
5033 EV_FREQUENT_CHECK; 5177 EV_FREQUENT_CHECK;
5034} 5178}

Diff Legend

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