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Comparing libev/ev.c (file contents):
Revision 1.36 by root, Thu Nov 1 13:11:11 2007 UTC vs.
Revision 1.46 by root, Sat Nov 3 09:20:12 2007 UTC

… …
42#include <stdio.h> 42#include <stdio.h>
43 43
44#include <assert.h> 44#include <assert.h>
45#include <errno.h> 45#include <errno.h>
46#include <sys/types.h> 46#include <sys/types.h>
47#ifndef WIN32
47#include <sys/wait.h> 48# include <sys/wait.h>
49#endif
48#include <sys/time.h> 50#include <sys/time.h>
49#include <time.h> 51#include <time.h>
50 52
53/**/
54
51#ifndef EV_USE_MONOTONIC 55#ifndef EV_USE_MONOTONIC
52# ifdef CLOCK_MONOTONIC
53# define EV_USE_MONOTONIC 1 56# define EV_USE_MONOTONIC 1
54# endif
55#endif 57#endif
56 58
57#ifndef EV_USE_SELECT 59#ifndef EV_USE_SELECT
58# define EV_USE_SELECT 1 60# define EV_USE_SELECT 1
59#endif 61#endif
60 62
63#ifndef EV_USE_POLL
64# define EV_USE_POLL 0 /* poll is usually slower than select, and not as well tested */
65#endif
66
61#ifndef EV_USE_EPOLL 67#ifndef EV_USE_EPOLL
62# define EV_USE_EPOLL 0 68# define EV_USE_EPOLL 0
63#endif 69#endif
64 70
71#ifndef EV_USE_KQUEUE
72# define EV_USE_KQUEUE 0
73#endif
74
75#ifndef EV_USE_REALTIME
76# define EV_USE_REALTIME 1
77#endif
78
79/**/
80
81#ifndef CLOCK_MONOTONIC
82# undef EV_USE_MONOTONIC
83# define EV_USE_MONOTONIC 0
84#endif
85
65#ifndef CLOCK_REALTIME 86#ifndef CLOCK_REALTIME
87# undef EV_USE_REALTIME
66# define EV_USE_REALTIME 0 88# define EV_USE_REALTIME 0
67#endif 89#endif
68#ifndef EV_USE_REALTIME 90
69# define EV_USE_REALTIME 1 /* posix requirement, but might be slower */ 91/**/
70#endif
71 92
72#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */ 93#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
73#define MAX_BLOCKTIME 59.731 /* never wait longer than this time (to detetc time jumps) */ 94#define MAX_BLOCKTIME 59.731 /* never wait longer than this time (to detect time jumps) */
74#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */ 95#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
75#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds */ 96/*#define CLEANUP_INTERVAL 300. /* how often to try to free memory and re-check fds */
76 97
77#include "ev.h" 98#include "ev.h"
99
100#if __GNUC__ >= 3
101# define expect(expr,value) __builtin_expect ((expr),(value))
102# define inline inline
103#else
104# define expect(expr,value) (expr)
105# define inline static
106#endif
107
108#define expect_false(expr) expect ((expr) != 0, 0)
109#define expect_true(expr) expect ((expr) != 0, 1)
110
111#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
112#define ABSPRI(w) ((w)->priority - EV_MINPRI)
78 113
79typedef struct ev_watcher *W; 114typedef struct ev_watcher *W;
80typedef struct ev_watcher_list *WL; 115typedef struct ev_watcher_list *WL;
81typedef struct ev_watcher_time *WT; 116typedef struct ev_watcher_time *WT;
82 117
83static ev_tstamp now, diff; /* monotonic clock */ 118static ev_tstamp now_floor, now, diff; /* monotonic clock */
84ev_tstamp ev_now; 119ev_tstamp ev_now;
85int ev_method; 120int ev_method;
86 121
87static int have_monotonic; /* runtime */ 122static int have_monotonic; /* runtime */
88 123
… …
108 143
109static ev_tstamp 144static ev_tstamp
110get_clock (void) 145get_clock (void)
111{ 146{
112#if EV_USE_MONOTONIC 147#if EV_USE_MONOTONIC
113 if (have_monotonic) 148 if (expect_true (have_monotonic))
114 { 149 {
115 struct timespec ts; 150 struct timespec ts;
116 clock_gettime (CLOCK_MONOTONIC, &ts); 151 clock_gettime (CLOCK_MONOTONIC, &ts);
117 return ts.tv_sec + ts.tv_nsec * 1e-9; 152 return ts.tv_sec + ts.tv_nsec * 1e-9;
118 } 153 }
… …
122} 157}
123 158
124#define array_roundsize(base,n) ((n) | 4 & ~3) 159#define array_roundsize(base,n) ((n) | 4 & ~3)
125 160
126#define array_needsize(base,cur,cnt,init) \ 161#define array_needsize(base,cur,cnt,init) \
127 if ((cnt) > cur) \ 162 if (expect_false ((cnt) > cur)) \
128 { \ 163 { \
129 int newcnt = cur; \ 164 int newcnt = cur; \
130 do \ 165 do \
131 { \ 166 { \
132 newcnt = array_roundsize (base, newcnt << 1); \ 167 newcnt = array_roundsize (base, newcnt << 1); \
… …
167{ 202{
168 W w; 203 W w;
169 int events; 204 int events;
170} ANPENDING; 205} ANPENDING;
171 206
172static ANPENDING *pendings; 207static ANPENDING *pendings [NUMPRI];
173static int pendingmax, pendingcnt; 208static int pendingmax [NUMPRI], pendingcnt [NUMPRI];
174 209
175static void 210static void
176event (W w, int events) 211event (W w, int events)
177{ 212{
178 if (w->pending) 213 if (w->pending)
179 { 214 {
180 pendings [w->pending - 1].events |= events; 215 pendings [ABSPRI (w)][w->pending - 1].events |= events;
181 return; 216 return;
182 } 217 }
183 218
184 w->pending = ++pendingcnt; 219 w->pending = ++pendingcnt [ABSPRI (w)];
185 array_needsize (pendings, pendingmax, pendingcnt, ); 220 array_needsize (pendings [ABSPRI (w)], pendingmax [ABSPRI (w)], pendingcnt [ABSPRI (w)], );
186 pendings [pendingcnt - 1].w = w; 221 pendings [ABSPRI (w)][w->pending - 1].w = w;
187 pendings [pendingcnt - 1].events = events; 222 pendings [ABSPRI (w)][w->pending - 1].events = events;
188} 223}
189 224
190static void 225static void
191queue_events (W *events, int eventcnt, int type) 226queue_events (W *events, int eventcnt, int type)
192{ 227{
… …
255 ++fdchangecnt; 290 ++fdchangecnt;
256 array_needsize (fdchanges, fdchangemax, fdchangecnt, ); 291 array_needsize (fdchanges, fdchangemax, fdchangecnt, );
257 fdchanges [fdchangecnt - 1] = fd; 292 fdchanges [fdchangecnt - 1] = fd;
258} 293}
259 294
295static void
296fd_kill (int fd)
297{
298 struct ev_io *w;
299
300 printf ("killing fd %d\n", fd);//D
301 while ((w = anfds [fd].head))
302 {
303 ev_io_stop (w);
304 event ((W)w, EV_ERROR | EV_READ | EV_WRITE);
305 }
306}
307
260/* called on EBADF to verify fds */ 308/* called on EBADF to verify fds */
261static void 309static void
262fd_recheck (void) 310fd_ebadf (void)
263{ 311{
264 int fd; 312 int fd;
265 313
266 for (fd = 0; fd < anfdmax; ++fd) 314 for (fd = 0; fd < anfdmax; ++fd)
267 if (anfds [fd].events) 315 if (anfds [fd].events)
268 if (fcntl (fd, F_GETFD) == -1 && errno == EBADF) 316 if (fcntl (fd, F_GETFD) == -1 && errno == EBADF)
269 while (anfds [fd].head) 317 fd_kill (fd);
318}
319
320/* called on ENOMEM in select/poll to kill some fds and retry */
321static void
322fd_enomem (void)
323{
324 int fd = anfdmax;
325
326 while (fd--)
327 if (anfds [fd].events)
270 { 328 {
271 ev_io_stop (anfds [fd].head); 329 close (fd);
272 event ((W)anfds [fd].head, EV_ERROR | EV_READ | EV_WRITE); 330 fd_kill (fd);
331 return;
273 } 332 }
274} 333}
275 334
276/*****************************************************************************/ 335/*****************************************************************************/
277 336
278static struct ev_timer **timers; 337static struct ev_timer **timers;
… …
363 422
364static void 423static void
365sigcb (struct ev_io *iow, int revents) 424sigcb (struct ev_io *iow, int revents)
366{ 425{
367 struct ev_signal *w; 426 struct ev_signal *w;
368 int sig; 427 int signum;
369 428
370 read (sigpipe [0], &revents, 1); 429 read (sigpipe [0], &revents, 1);
371 gotsig = 0; 430 gotsig = 0;
372 431
373 for (sig = signalmax; sig--; ) 432 for (signum = signalmax; signum--; )
374 if (signals [sig].gotsig) 433 if (signals [signum].gotsig)
375 { 434 {
376 signals [sig].gotsig = 0; 435 signals [signum].gotsig = 0;
377 436
378 for (w = signals [sig].head; w; w = w->next) 437 for (w = signals [signum].head; w; w = w->next)
379 event ((W)w, EV_SIGNAL); 438 event ((W)w, EV_SIGNAL);
380 } 439 }
381} 440}
382 441
383static void 442static void
384siginit (void) 443siginit (void)
385{ 444{
445#ifndef WIN32
386 fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC); 446 fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
387 fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC); 447 fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
388 448
389 /* rather than sort out wether we really need nb, set it */ 449 /* rather than sort out wether we really need nb, set it */
390 fcntl (sigpipe [0], F_SETFL, O_NONBLOCK); 450 fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
391 fcntl (sigpipe [1], F_SETFL, O_NONBLOCK); 451 fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
452#endif
392 453
393 ev_io_set (&sigev, sigpipe [0], EV_READ); 454 ev_io_set (&sigev, sigpipe [0], EV_READ);
394 ev_io_start (&sigev); 455 ev_io_start (&sigev);
395} 456}
396 457
… …
408/*****************************************************************************/ 469/*****************************************************************************/
409 470
410static struct ev_child *childs [PID_HASHSIZE]; 471static struct ev_child *childs [PID_HASHSIZE];
411static struct ev_signal childev; 472static struct ev_signal childev;
412 473
474#ifndef WIN32
475
413#ifndef WCONTINUED 476#ifndef WCONTINUED
414# define WCONTINUED 0 477# define WCONTINUED 0
415#endif 478#endif
416 479
417static void 480static void
… …
420 struct ev_child *w; 483 struct ev_child *w;
421 int pid, status; 484 int pid, status;
422 485
423 while ((pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)) != -1) 486 while ((pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)) != -1)
424 for (w = childs [pid & (PID_HASHSIZE - 1)]; w; w = w->next) 487 for (w = childs [pid & (PID_HASHSIZE - 1)]; w; w = w->next)
425 if (w->pid == pid || w->pid == -1) 488 if (w->pid == pid || !w->pid)
426 { 489 {
490 w->rpid = pid;
427 w->status = status; 491 w->rstatus = status;
428 event ((W)w, EV_CHILD); 492 event ((W)w, EV_CHILD);
429 } 493 }
430} 494}
431 495
432/*****************************************************************************/ 496#endif
433 497
498/*****************************************************************************/
499
500#if EV_USE_KQUEUE
501# include "ev_kqueue.c"
502#endif
434#if EV_USE_EPOLL 503#if EV_USE_EPOLL
435# include "ev_epoll.c" 504# include "ev_epoll.c"
436#endif 505#endif
506#if EV_USE_POLL
507# include "ev_poll.c"
508#endif
437#if EV_USE_SELECT 509#if EV_USE_SELECT
438# include "ev_select.c" 510# include "ev_select.c"
439#endif 511#endif
440 512
441int 513int
… …
448ev_version_minor (void) 520ev_version_minor (void)
449{ 521{
450 return EV_VERSION_MINOR; 522 return EV_VERSION_MINOR;
451} 523}
452 524
525/* return true if we are running with elevated privileges and ignore env variables */
526static int
527enable_secure ()
528{
529 return getuid () != geteuid ()
530 || getgid () != getegid ();
531}
532
453int ev_init (int flags) 533int ev_init (int methods)
454{ 534{
455 if (!ev_method) 535 if (!ev_method)
456 { 536 {
457#if EV_USE_MONOTONIC 537#if EV_USE_MONOTONIC
458 { 538 {
… …
460 if (!clock_gettime (CLOCK_MONOTONIC, &ts)) 540 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
461 have_monotonic = 1; 541 have_monotonic = 1;
462 } 542 }
463#endif 543#endif
464 544
465 ev_now = ev_time (); 545 ev_now = ev_time ();
466 now = get_clock (); 546 now = get_clock ();
547 now_floor = now;
467 diff = ev_now - now; 548 diff = ev_now - now;
468 549
469 if (pipe (sigpipe)) 550 if (pipe (sigpipe))
470 return 0; 551 return 0;
471 552
553 if (methods == EVMETHOD_AUTO)
554 if (!enable_secure () && getenv ("LIBEV_METHODS"))
555 methods = atoi (getenv ("LIBEV_METHODS"));
556 else
472 ev_method = EVMETHOD_NONE; 557 methods = EVMETHOD_ANY;
558
559 ev_method = 0;
560#if EV_USE_KQUEUE
561 if (!ev_method && (methods & EVMETHOD_KQUEUE)) kqueue_init (methods);
562#endif
473#if EV_USE_EPOLL 563#if EV_USE_EPOLL
474 if (ev_method == EVMETHOD_NONE) epoll_init (flags); 564 if (!ev_method && (methods & EVMETHOD_EPOLL )) epoll_init (methods);
565#endif
566#if EV_USE_POLL
567 if (!ev_method && (methods & EVMETHOD_POLL )) poll_init (methods);
475#endif 568#endif
476#if EV_USE_SELECT 569#if EV_USE_SELECT
477 if (ev_method == EVMETHOD_NONE) select_init (flags); 570 if (!ev_method && (methods & EVMETHOD_SELECT)) select_init (methods);
478#endif 571#endif
479 572
480 if (ev_method) 573 if (ev_method)
481 { 574 {
482 ev_watcher_init (&sigev, sigcb); 575 ev_watcher_init (&sigev, sigcb);
483 siginit (); 576 siginit ();
484 577
578#ifndef WIN32
485 ev_signal_init (&childev, childcb, SIGCHLD); 579 ev_signal_init (&childev, childcb, SIGCHLD);
486 ev_signal_start (&childev); 580 ev_signal_start (&childev);
581#endif
487 } 582 }
488 } 583 }
489 584
490 return ev_method; 585 return ev_method;
491} 586}
… …
522/*****************************************************************************/ 617/*****************************************************************************/
523 618
524static void 619static void
525call_pending (void) 620call_pending (void)
526{ 621{
622 int pri;
623
624 for (pri = NUMPRI; pri--; )
527 while (pendingcnt) 625 while (pendingcnt [pri])
528 { 626 {
529 ANPENDING *p = pendings + --pendingcnt; 627 ANPENDING *p = pendings [pri] + --pendingcnt [pri];
530 628
531 if (p->w) 629 if (p->w)
532 { 630 {
533 p->w->pending = 0; 631 p->w->pending = 0;
534 p->w->cb (p->w, p->events); 632 p->w->cb (p->w, p->events);
535 } 633 }
536 } 634 }
537} 635}
538 636
539static void 637static void
540timers_reify (void) 638timers_reify (void)
541{ 639{
… …
601 } 699 }
602 } 700 }
603 } 701 }
604} 702}
605 703
704static int
705time_update_monotonic (void)
706{
707 now = get_clock ();
708
709 if (expect_true (now - now_floor < MIN_TIMEJUMP * .5))
710 {
711 ev_now = now + diff;
712 return 0;
713 }
714 else
715 {
716 now_floor = now;
717 ev_now = ev_time ();
718 return 1;
719 }
720}
721
606static void 722static void
607time_update (void) 723time_update (void)
608{ 724{
609 int i; 725 int i;
610 726
611 ev_now = ev_time (); 727#if EV_USE_MONOTONIC
612
613 if (have_monotonic) 728 if (expect_true (have_monotonic))
614 { 729 {
730 if (time_update_monotonic ())
731 {
615 ev_tstamp odiff = diff; 732 ev_tstamp odiff = diff;
616 733
617 for (i = 4; --i; ) /* loop a few times, before making important decisions */ 734 for (i = 4; --i; ) /* loop a few times, before making important decisions */
618 { 735 {
619 now = get_clock ();
620 diff = ev_now - now; 736 diff = ev_now - now;
621 737
622 if (fabs (odiff - diff) < MIN_TIMEJUMP) 738 if (fabs (odiff - diff) < MIN_TIMEJUMP)
623 return; /* all is well */ 739 return; /* all is well */
624 740
625 ev_now = ev_time (); 741 ev_now = ev_time ();
742 now = get_clock ();
743 now_floor = now;
626 } 744 }
627 745
628 periodics_reschedule (diff - odiff); 746 periodics_reschedule (diff - odiff);
629 /* no timer adjustment, as the monotonic clock doesn't jump */ 747 /* no timer adjustment, as the monotonic clock doesn't jump */
748 }
630 } 749 }
631 else 750 else
751#endif
632 { 752 {
753 ev_now = ev_time ();
754
633 if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP) 755 if (expect_false (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
634 { 756 {
635 periodics_reschedule (ev_now - now); 757 periodics_reschedule (ev_now - now);
636 758
637 /* adjust timers. this is easy, as the offset is the same for all */ 759 /* adjust timers. this is easy, as the offset is the same for all */
638 for (i = 0; i < timercnt; ++i) 760 for (i = 0; i < timercnt; ++i)
… …
651 ev_loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0; 773 ev_loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
652 774
653 do 775 do
654 { 776 {
655 /* queue check watchers (and execute them) */ 777 /* queue check watchers (and execute them) */
656 if (preparecnt) 778 if (expect_false (preparecnt))
657 { 779 {
658 queue_events ((W *)prepares, preparecnt, EV_PREPARE); 780 queue_events ((W *)prepares, preparecnt, EV_PREPARE);
659 call_pending (); 781 call_pending ();
660 } 782 }
661 783
… …
664 786
665 /* calculate blocking time */ 787 /* calculate blocking time */
666 788
667 /* we only need this for !monotonic clockor timers, but as we basically 789 /* we only need this for !monotonic clockor timers, but as we basically
668 always have timers, we just calculate it always */ 790 always have timers, we just calculate it always */
791#if EV_USE_MONOTONIC
792 if (expect_true (have_monotonic))
793 time_update_monotonic ();
794 else
795#endif
796 {
669 ev_now = ev_time (); 797 ev_now = ev_time ();
798 now = ev_now;
799 }
670 800
671 if (flags & EVLOOP_NONBLOCK || idlecnt) 801 if (flags & EVLOOP_NONBLOCK || idlecnt)
672 block = 0.; 802 block = 0.;
673 else 803 else
674 { 804 {
675 block = MAX_BLOCKTIME; 805 block = MAX_BLOCKTIME;
676 806
677 if (timercnt) 807 if (timercnt)
678 { 808 {
679 ev_tstamp to = timers [0]->at - (have_monotonic ? get_clock () : ev_now) + method_fudge; 809 ev_tstamp to = timers [0]->at - now + method_fudge;
680 if (block > to) block = to; 810 if (block > to) block = to;
681 } 811 }
682 812
683 if (periodiccnt) 813 if (periodiccnt)
684 { 814 {
… …
741static void 871static void
742ev_clear_pending (W w) 872ev_clear_pending (W w)
743{ 873{
744 if (w->pending) 874 if (w->pending)
745 { 875 {
746 pendings [w->pending - 1].w = 0; 876 pendings [ABSPRI (w)][w->pending - 1].w = 0;
747 w->pending = 0; 877 w->pending = 0;
748 } 878 }
749} 879}
750 880
751static void 881static void
752ev_start (W w, int active) 882ev_start (W w, int active)
753{ 883{
884 if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
885 if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
886
754 w->active = active; 887 w->active = active;
755} 888}
756 889
757static void 890static void
758ev_stop (W w) 891ev_stop (W w)
… …
763/*****************************************************************************/ 896/*****************************************************************************/
764 897
765void 898void
766ev_io_start (struct ev_io *w) 899ev_io_start (struct ev_io *w)
767{ 900{
901 int fd = w->fd;
902
768 if (ev_is_active (w)) 903 if (ev_is_active (w))
769 return; 904 return;
770
771 int fd = w->fd;
772 905
773 assert (("ev_io_start called with negative fd", fd >= 0)); 906 assert (("ev_io_start called with negative fd", fd >= 0));
774 907
775 ev_start ((W)w, 1); 908 ev_start ((W)w, 1);
776 array_needsize (anfds, anfdmax, fd + 1, anfds_init); 909 array_needsize (anfds, anfdmax, fd + 1, anfds_init);

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