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Comparing libev/ev.c (file contents):
Revision 1.13 by root, Wed Oct 31 10:50:05 2007 UTC vs.
Revision 1.44 by root, Fri Nov 2 20:59:14 2007 UTC

1/*
2 * libev event processing core, watcher management
3 *
4 * Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are
9 * met:
10 *
11 * * Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 *
14 * * Redistributions in binary form must reproduce the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer in the documentation and/or other materials provided
17 * with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
23 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
25 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
29 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31#if EV_USE_CONFIG_H
32# include "config.h"
33#endif
34
1#include <math.h> 35#include <math.h>
2#include <stdlib.h> 36#include <stdlib.h>
3#include <unistd.h> 37#include <unistd.h>
4#include <fcntl.h> 38#include <fcntl.h>
5#include <signal.h> 39#include <signal.h>
40#include <stddef.h>
6 41
7#include <stdio.h> 42#include <stdio.h>
8 43
9#include <assert.h> 44#include <assert.h>
10#include <errno.h> 45#include <errno.h>
46#include <sys/types.h>
47#include <sys/wait.h>
11#include <sys/time.h> 48#include <sys/time.h>
12#include <time.h> 49#include <time.h>
13 50
14#define HAVE_EPOLL 1 51/**/
15 52
16#ifndef HAVE_MONOTONIC 53#ifndef EV_USE_MONOTONIC
54# define EV_USE_MONOTONIC 1
55#endif
56
57#ifndef EV_USE_SELECT
58# define EV_USE_SELECT 1
59#endif
60
61#ifndef EV_USE_POLL
62# define EV_USE_POLL 0 /* poll is usually slower than select, and not as well tested */
63#endif
64
65#ifndef EV_USE_EPOLL
66# define EV_USE_EPOLL 0
67#endif
68
69#ifndef EV_USE_KQUEUE
70# define EV_USE_KQUEUE 0
71#endif
72
73#ifndef EV_USE_REALTIME
74# define EV_USE_REALTIME 1
75#endif
76
77/**/
78
17# ifdef CLOCK_MONOTONIC 79#ifndef CLOCK_MONOTONIC
80# undef EV_USE_MONOTONIC
18# define HAVE_MONOTONIC 1 81# define EV_USE_MONOTONIC 0
19# endif 82#endif
20#endif
21 83
22#ifndef HAVE_SELECT
23# define HAVE_SELECT 1
24#endif
25
26#ifndef HAVE_EPOLL
27# define HAVE_EPOLL 0
28#endif
29
30#ifndef HAVE_REALTIME 84#ifndef CLOCK_REALTIME
31# define HAVE_REALTIME 1 /* posix requirement, but might be slower */ 85# undef EV_USE_REALTIME
86# define EV_USE_REALTIME 0
32#endif 87#endif
88
89/**/
33 90
34#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */ 91#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
35#define MAX_BLOCKTIME 60. 92#define MAX_BLOCKTIME 59.731 /* never wait longer than this time (to detect time jumps) */
93#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
94/*#define CLEANUP_INTERVAL 300. /* how often to try to free memory and re-check fds */
36 95
37#include "ev.h" 96#include "ev.h"
97
98#if __GNUC__ >= 3
99# define expect(expr,value) __builtin_expect ((expr),(value))
100# define inline inline
101#else
102# define expect(expr,value) (expr)
103# define inline static
104#endif
105
106#define expect_false(expr) expect ((expr) != 0, 0)
107#define expect_true(expr) expect ((expr) != 0, 1)
108
109#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
110#define ABSPRI(w) ((w)->priority - EV_MINPRI)
38 111
39typedef struct ev_watcher *W; 112typedef struct ev_watcher *W;
40typedef struct ev_watcher_list *WL; 113typedef struct ev_watcher_list *WL;
41typedef struct ev_watcher_time *WT; 114typedef struct ev_watcher_time *WT;
42 115
43static ev_tstamp now, diff; /* monotonic clock */ 116static ev_tstamp now_floor, now, diff; /* monotonic clock */
44ev_tstamp ev_now; 117ev_tstamp ev_now;
45int ev_method; 118int ev_method;
46 119
47static int have_monotonic; /* runtime */ 120static int have_monotonic; /* runtime */
48 121
… …
53/*****************************************************************************/ 126/*****************************************************************************/
54 127
55ev_tstamp 128ev_tstamp
56ev_time (void) 129ev_time (void)
57{ 130{
58#if HAVE_REALTIME 131#if EV_USE_REALTIME
59 struct timespec ts; 132 struct timespec ts;
60 clock_gettime (CLOCK_REALTIME, &ts); 133 clock_gettime (CLOCK_REALTIME, &ts);
61 return ts.tv_sec + ts.tv_nsec * 1e-9; 134 return ts.tv_sec + ts.tv_nsec * 1e-9;
62#else 135#else
63 struct timeval tv; 136 struct timeval tv;
… …
67} 140}
68 141
69static ev_tstamp 142static ev_tstamp
70get_clock (void) 143get_clock (void)
71{ 144{
72#if HAVE_MONOTONIC 145#if EV_USE_MONOTONIC
73 if (have_monotonic) 146 if (expect_true (have_monotonic))
74 { 147 {
75 struct timespec ts; 148 struct timespec ts;
76 clock_gettime (CLOCK_MONOTONIC, &ts); 149 clock_gettime (CLOCK_MONOTONIC, &ts);
77 return ts.tv_sec + ts.tv_nsec * 1e-9; 150 return ts.tv_sec + ts.tv_nsec * 1e-9;
78 } 151 }
79#endif 152#endif
80 153
81 return ev_time (); 154 return ev_time ();
82} 155}
83 156
157#define array_roundsize(base,n) ((n) | 4 & ~3)
158
84#define array_needsize(base,cur,cnt,init) \ 159#define array_needsize(base,cur,cnt,init) \
85 if ((cnt) > cur) \ 160 if (expect_false ((cnt) > cur)) \
86 { \ 161 { \
87 int newcnt = cur ? cur << 1 : 16; \ 162 int newcnt = cur; \
88 fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\ 163 do \
164 { \
165 newcnt = array_roundsize (base, newcnt << 1); \
166 } \
167 while ((cnt) > newcnt); \
168 \
89 base = realloc (base, sizeof (*base) * (newcnt)); \ 169 base = realloc (base, sizeof (*base) * (newcnt)); \
90 init (base + cur, newcnt - cur); \ 170 init (base + cur, newcnt - cur); \
91 cur = newcnt; \ 171 cur = newcnt; \
92 } 172 }
93 173
94/*****************************************************************************/ 174/*****************************************************************************/
95 175
96typedef struct 176typedef struct
97{ 177{
98 struct ev_io *head; 178 struct ev_io *head;
99 unsigned char wev, rev; /* want, received event set */ 179 unsigned char events;
180 unsigned char reify;
100} ANFD; 181} ANFD;
101 182
102static ANFD *anfds; 183static ANFD *anfds;
103static int anfdmax; 184static int anfdmax;
104 185
105static int *fdchanges;
106static int fdchangemax, fdchangecnt;
107
108static void 186static void
109anfds_init (ANFD *base, int count) 187anfds_init (ANFD *base, int count)
110{ 188{
111 while (count--) 189 while (count--)
112 { 190 {
113 base->head = 0; 191 base->head = 0;
114 base->wev = base->rev = EV_NONE; 192 base->events = EV_NONE;
193 base->reify = 0;
194
115 ++base; 195 ++base;
116 } 196 }
117} 197}
118 198
119typedef struct 199typedef struct
120{ 200{
121 W w; 201 W w;
122 int events; 202 int events;
123} ANPENDING; 203} ANPENDING;
124 204
125static ANPENDING *pendings; 205static ANPENDING *pendings [NUMPRI];
126static int pendingmax, pendingcnt; 206static int pendingmax [NUMPRI], pendingcnt [NUMPRI];
127 207
128static void 208static void
129event (W w, int events) 209event (W w, int events)
130{ 210{
211 if (w->pending)
212 {
213 pendings [ABSPRI (w)][w->pending - 1].events |= events;
214 return;
215 }
216
131 w->pending = ++pendingcnt; 217 w->pending = ++pendingcnt [ABSPRI (w)];
132 array_needsize (pendings, pendingmax, pendingcnt, ); 218 array_needsize (pendings [ABSPRI (w)], pendingmax [ABSPRI (w)], pendingcnt [ABSPRI (w)], );
133 pendings [pendingcnt - 1].w = w; 219 pendings [ABSPRI (w)][w->pending - 1].w = w;
134 pendings [pendingcnt - 1].events = events; 220 pendings [ABSPRI (w)][w->pending - 1].events = events;
221}
222
223static void
224queue_events (W *events, int eventcnt, int type)
225{
226 int i;
227
228 for (i = 0; i < eventcnt; ++i)
229 event (events [i], type);
135} 230}
136 231
137static void 232static void
138fd_event (int fd, int events) 233fd_event (int fd, int events)
139{ 234{
… …
147 if (ev) 242 if (ev)
148 event ((W)w, ev); 243 event ((W)w, ev);
149 } 244 }
150} 245}
151 246
247/*****************************************************************************/
248
249static int *fdchanges;
250static int fdchangemax, fdchangecnt;
251
152static void 252static void
153queue_events (W *events, int eventcnt, int type) 253fd_reify (void)
154{ 254{
155 int i; 255 int i;
156 256
157 for (i = 0; i < eventcnt; ++i) 257 for (i = 0; i < fdchangecnt; ++i)
158 event (events [i], type); 258 {
259 int fd = fdchanges [i];
260 ANFD *anfd = anfds + fd;
261 struct ev_io *w;
262
263 int events = 0;
264
265 for (w = anfd->head; w; w = w->next)
266 events |= w->events;
267
268 anfd->reify = 0;
269
270 if (anfd->events != events)
271 {
272 method_modify (fd, anfd->events, events);
273 anfd->events = events;
274 }
275 }
276
277 fdchangecnt = 0;
278}
279
280static void
281fd_change (int fd)
282{
283 if (anfds [fd].reify || fdchangecnt < 0)
284 return;
285
286 anfds [fd].reify = 1;
287
288 ++fdchangecnt;
289 array_needsize (fdchanges, fdchangemax, fdchangecnt, );
290 fdchanges [fdchangecnt - 1] = fd;
291}
292
293static void
294fd_kill (int fd)
295{
296 struct ev_io *w;
297
298 printf ("killing fd %d\n", fd);//D
299 while ((w = anfds [fd].head))
300 {
301 ev_io_stop (w);
302 event ((W)w, EV_ERROR | EV_READ | EV_WRITE);
303 }
304}
305
306/* called on EBADF to verify fds */
307static void
308fd_ebadf (void)
309{
310 int fd;
311
312 for (fd = 0; fd < anfdmax; ++fd)
313 if (anfds [fd].events)
314 if (fcntl (fd, F_GETFD) == -1 && errno == EBADF)
315 fd_kill (fd);
316}
317
318/* called on ENOMEM in select/poll to kill some fds and retry */
319static void
320fd_enomem (void)
321{
322 int fd = anfdmax;
323
324 while (fd--)
325 if (anfds [fd].events)
326 {
327 close (fd);
328 fd_kill (fd);
329 return;
330 }
159} 331}
160 332
161/*****************************************************************************/ 333/*****************************************************************************/
162 334
163static struct ev_timer **timers; 335static struct ev_timer **timers;
… …
210/*****************************************************************************/ 382/*****************************************************************************/
211 383
212typedef struct 384typedef struct
213{ 385{
214 struct ev_signal *head; 386 struct ev_signal *head;
215 sig_atomic_t gotsig; 387 sig_atomic_t volatile gotsig;
216} ANSIG; 388} ANSIG;
217 389
218static ANSIG *signals; 390static ANSIG *signals;
219static int signalmax; 391static int signalmax;
220 392
221static int sigpipe [2]; 393static int sigpipe [2];
222static sig_atomic_t gotsig; 394static sig_atomic_t volatile gotsig;
223static struct ev_io sigev; 395static struct ev_io sigev;
224 396
225static void 397static void
226signals_init (ANSIG *base, int count) 398signals_init (ANSIG *base, int count)
227{ 399{
228 while (count--) 400 while (count--)
229 { 401 {
230 base->head = 0; 402 base->head = 0;
231 base->gotsig = 0; 403 base->gotsig = 0;
404
232 ++base; 405 ++base;
233 } 406 }
234} 407}
235 408
236static void 409static void
… …
239 signals [signum - 1].gotsig = 1; 412 signals [signum - 1].gotsig = 1;
240 413
241 if (!gotsig) 414 if (!gotsig)
242 { 415 {
243 gotsig = 1; 416 gotsig = 1;
244 write (sigpipe [1], &gotsig, 1); 417 write (sigpipe [1], &signum, 1);
245 } 418 }
246} 419}
247 420
248static void 421static void
249sigcb (struct ev_io *iow, int revents) 422sigcb (struct ev_io *iow, int revents)
250{ 423{
251 struct ev_signal *w; 424 struct ev_signal *w;
252 int sig; 425 int signum;
253 426
427 read (sigpipe [0], &revents, 1);
254 gotsig = 0; 428 gotsig = 0;
255 read (sigpipe [0], &revents, 1);
256 429
257 for (sig = signalmax; sig--; ) 430 for (signum = signalmax; signum--; )
258 if (signals [sig].gotsig) 431 if (signals [signum].gotsig)
259 { 432 {
260 signals [sig].gotsig = 0; 433 signals [signum].gotsig = 0;
261 434
262 for (w = signals [sig].head; w; w = w->next) 435 for (w = signals [signum].head; w; w = w->next)
263 event ((W)w, EV_SIGNAL); 436 event ((W)w, EV_SIGNAL);
264 } 437 }
265} 438}
266 439
267static void 440static void
… …
272 445
273 /* rather than sort out wether we really need nb, set it */ 446 /* rather than sort out wether we really need nb, set it */
274 fcntl (sigpipe [0], F_SETFL, O_NONBLOCK); 447 fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
275 fcntl (sigpipe [1], F_SETFL, O_NONBLOCK); 448 fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
276 449
277 evio_set (&sigev, sigpipe [0], EV_READ); 450 ev_io_set (&sigev, sigpipe [0], EV_READ);
278 evio_start (&sigev); 451 ev_io_start (&sigev);
279} 452}
280 453
281/*****************************************************************************/ 454/*****************************************************************************/
282 455
283static struct ev_idle **idles; 456static struct ev_idle **idles;
284static int idlemax, idlecnt; 457static int idlemax, idlecnt;
285 458
459static struct ev_prepare **prepares;
460static int preparemax, preparecnt;
461
286static struct ev_check **checks; 462static struct ev_check **checks;
287static int checkmax, checkcnt; 463static int checkmax, checkcnt;
288 464
289/*****************************************************************************/ 465/*****************************************************************************/
290 466
467static struct ev_child *childs [PID_HASHSIZE];
468static struct ev_signal childev;
469
470#ifndef WCONTINUED
471# define WCONTINUED 0
472#endif
473
474static void
475childcb (struct ev_signal *sw, int revents)
476{
477 struct ev_child *w;
478 int pid, status;
479
480 while ((pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)) != -1)
481 for (w = childs [pid & (PID_HASHSIZE - 1)]; w; w = w->next)
482 if (w->pid == pid || !w->pid)
483 {
484 w->status = status;
485 event ((W)w, EV_CHILD);
486 }
487}
488
489/*****************************************************************************/
490
491#if EV_USE_KQUEUE
492# include "ev_kqueue.c"
493#endif
291#if HAVE_EPOLL 494#if EV_USE_EPOLL
292# include "ev_epoll.c" 495# include "ev_epoll.c"
293#endif 496#endif
497#if EV_USE_POLL
498# include "ev_poll.c"
499#endif
294#if HAVE_SELECT 500#if EV_USE_SELECT
295# include "ev_select.c" 501# include "ev_select.c"
296#endif 502#endif
297 503
504int
505ev_version_major (void)
506{
507 return EV_VERSION_MAJOR;
508}
509
510int
511ev_version_minor (void)
512{
513 return EV_VERSION_MINOR;
514}
515
516/* return true if we are running with elevated privileges and ignore env variables */
517static int
518enable_secure ()
519{
520 return getuid () != geteuid ()
521 || getgid () != getegid ();
522}
523
298int ev_init (int flags) 524int ev_init (int methods)
299{ 525{
300#if HAVE_MONOTONIC
301 {
302 struct timespec ts;
303 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
304 have_monotonic = 1;
305 }
306#endif
307
308 ev_now = ev_time ();
309 now = get_clock ();
310 diff = ev_now - now;
311
312 if (pipe (sigpipe))
313 return 0;
314
315 ev_method = EVMETHOD_NONE;
316#if HAVE_EPOLL
317 if (ev_method == EVMETHOD_NONE) epoll_init (flags);
318#endif
319#if HAVE_SELECT
320 if (ev_method == EVMETHOD_NONE) select_init (flags);
321#endif
322
323 if (ev_method) 526 if (!ev_method)
527 {
528#if EV_USE_MONOTONIC
324 { 529 {
530 struct timespec ts;
531 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
532 have_monotonic = 1;
533 }
534#endif
535
536 ev_now = ev_time ();
537 now = get_clock ();
538 now_floor = now;
539 diff = ev_now - now;
540
541 if (pipe (sigpipe))
542 return 0;
543
544 if (methods == EVMETHOD_AUTO)
545 if (!enable_secure () && getenv ("LIBEV_METHODS"))
546 methods = atoi (getenv ("LIBEV_METHODS"));
547 else
548 methods = EVMETHOD_ANY;
549
550 ev_method = 0;
551#if EV_USE_KQUEUE
552 if (!ev_method && (methods & EVMETHOD_KQUEUE)) kqueue_init (methods);
553#endif
554#if EV_USE_EPOLL
555 if (!ev_method && (methods & EVMETHOD_EPOLL )) epoll_init (methods);
556#endif
557#if EV_USE_POLL
558 if (!ev_method && (methods & EVMETHOD_POLL )) poll_init (methods);
559#endif
560#if EV_USE_SELECT
561 if (!ev_method && (methods & EVMETHOD_SELECT)) select_init (methods);
562#endif
563
564 if (ev_method)
565 {
325 evw_init (&sigev, sigcb); 566 ev_watcher_init (&sigev, sigcb);
326 siginit (); 567 siginit ();
568
569 ev_signal_init (&childev, childcb, SIGCHLD);
570 ev_signal_start (&childev);
571 }
327 } 572 }
328 573
329 return ev_method; 574 return ev_method;
330} 575}
331 576
332/*****************************************************************************/ 577/*****************************************************************************/
333 578
334void ev_prefork (void) 579void
580ev_fork_prepare (void)
335{ 581{
336 /* nop */ 582 /* nop */
337} 583}
338 584
585void
339void ev_postfork_parent (void) 586ev_fork_parent (void)
340{ 587{
341 /* nop */ 588 /* nop */
342} 589}
343 590
591void
344void ev_postfork_child (void) 592ev_fork_child (void)
345{ 593{
346#if HAVE_EPOLL 594#if EV_USE_EPOLL
347 if (ev_method == EVMETHOD_EPOLL) 595 if (ev_method == EVMETHOD_EPOLL)
348 epoll_postfork_child (); 596 epoll_postfork_child ();
349#endif 597#endif
350 598
351 evio_stop (&sigev); 599 ev_io_stop (&sigev);
352 close (sigpipe [0]); 600 close (sigpipe [0]);
353 close (sigpipe [1]); 601 close (sigpipe [1]);
354 pipe (sigpipe); 602 pipe (sigpipe);
355 siginit (); 603 siginit ();
356} 604}
357 605
358/*****************************************************************************/ 606/*****************************************************************************/
359 607
360static void 608static void
361fd_reify (void) 609call_pending (void)
362{ 610{
363 int i; 611 int pri;
364 612
365 for (i = 0; i < fdchangecnt; ++i) 613 for (pri = NUMPRI; pri--; )
366 { 614 while (pendingcnt [pri])
367 int fd = fdchanges [i];
368 ANFD *anfd = anfds + fd;
369 struct ev_io *w;
370
371 int wev = 0;
372
373 for (w = anfd->head; w; w = w->next)
374 wev |= w->events;
375
376 if (anfd->wev != wev)
377 { 615 {
378 method_modify (fd, anfd->wev, wev); 616 ANPENDING *p = pendings [pri] + --pendingcnt [pri];
379 anfd->wev = wev;
380 }
381 }
382 617
383 fdchangecnt = 0;
384}
385
386static void
387call_pending ()
388{
389 int i;
390
391 for (i = 0; i < pendingcnt; ++i)
392 {
393 ANPENDING *p = pendings + i;
394
395 if (p->w) 618 if (p->w)
396 { 619 {
397 p->w->pending = 0; 620 p->w->pending = 0;
398 p->w->cb (p->w, p->events); 621 p->w->cb (p->w, p->events);
399 } 622 }
400 } 623 }
401
402 pendingcnt = 0;
403} 624}
404 625
405static void 626static void
406timers_reify () 627timers_reify (void)
407{ 628{
408 while (timercnt && timers [0]->at <= now) 629 while (timercnt && timers [0]->at <= now)
409 { 630 {
410 struct ev_timer *w = timers [0]; 631 struct ev_timer *w = timers [0];
411 632
412 /* first reschedule or stop timer */ 633 /* first reschedule or stop timer */
413 if (w->repeat) 634 if (w->repeat)
414 { 635 {
636 assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
415 w->at = now + w->repeat; 637 w->at = now + w->repeat;
416 assert (("timer timeout in the past, negative repeat?", w->at > now));
417 downheap ((WT *)timers, timercnt, 0); 638 downheap ((WT *)timers, timercnt, 0);
418 } 639 }
419 else 640 else
420 evtimer_stop (w); /* nonrepeating: stop timer */ 641 ev_timer_stop (w); /* nonrepeating: stop timer */
421 642
422 event ((W)w, EV_TIMEOUT); 643 event ((W)w, EV_TIMEOUT);
423 } 644 }
424} 645}
425 646
426static void 647static void
427periodics_reify () 648periodics_reify (void)
428{ 649{
429 while (periodiccnt && periodics [0]->at <= ev_now) 650 while (periodiccnt && periodics [0]->at <= ev_now)
430 { 651 {
431 struct ev_periodic *w = periodics [0]; 652 struct ev_periodic *w = periodics [0];
432 653
433 /* first reschedule or stop timer */ 654 /* first reschedule or stop timer */
434 if (w->interval) 655 if (w->interval)
435 { 656 {
436 w->at += floor ((ev_now - w->at) / w->interval + 1.) * w->interval; 657 w->at += floor ((ev_now - w->at) / w->interval + 1.) * w->interval;
437 assert (("periodic timeout in the past, negative interval?", w->at > ev_now)); 658 assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", w->at > ev_now));
438 downheap ((WT *)periodics, periodiccnt, 0); 659 downheap ((WT *)periodics, periodiccnt, 0);
439 } 660 }
440 else 661 else
441 evperiodic_stop (w); /* nonrepeating: stop timer */ 662 ev_periodic_stop (w); /* nonrepeating: stop timer */
442 663
443 event ((W)w, EV_TIMEOUT); 664 event ((W)w, EV_PERIODIC);
444 } 665 }
445} 666}
446 667
447static void 668static void
448periodics_reschedule (ev_tstamp diff) 669periodics_reschedule (ev_tstamp diff)
… …
458 { 679 {
459 ev_tstamp diff = ceil ((ev_now - w->at) / w->interval) * w->interval; 680 ev_tstamp diff = ceil ((ev_now - w->at) / w->interval) * w->interval;
460 681
461 if (fabs (diff) >= 1e-4) 682 if (fabs (diff) >= 1e-4)
462 { 683 {
463 evperiodic_stop (w); 684 ev_periodic_stop (w);
464 evperiodic_start (w); 685 ev_periodic_start (w);
465 686
466 i = 0; /* restart loop, inefficient, but time jumps should be rare */ 687 i = 0; /* restart loop, inefficient, but time jumps should be rare */
467 } 688 }
468 } 689 }
469 } 690 }
470} 691}
471 692
472static void 693static int
694time_update_monotonic (void)
695{
696 now = get_clock ();
697
698 if (expect_true (now - now_floor < MIN_TIMEJUMP * .5))
699 {
700 ev_now = now + diff;
701 return 0;
702 }
703 else
704 {
705 now_floor = now;
706 ev_now = ev_time ();
707 return 1;
708 }
709}
710
711static void
473time_update () 712time_update (void)
474{ 713{
475 int i; 714 int i;
476 715
477 ev_now = ev_time (); 716#if EV_USE_MONOTONIC
478
479 if (have_monotonic) 717 if (expect_true (have_monotonic))
480 { 718 {
719 if (time_update_monotonic ())
720 {
481 ev_tstamp odiff = diff; 721 ev_tstamp odiff = diff;
482 722
483 for (i = 4; --i; ) /* loop a few times, before making important decisions */ 723 for (i = 4; --i; ) /* loop a few times, before making important decisions */
484 { 724 {
485 now = get_clock ();
486 diff = ev_now - now; 725 diff = ev_now - now;
487 726
488 if (fabs (odiff - diff) < MIN_TIMEJUMP) 727 if (fabs (odiff - diff) < MIN_TIMEJUMP)
489 return; /* all is well */ 728 return; /* all is well */
490 729
491 ev_now = ev_time (); 730 ev_now = ev_time ();
731 now = get_clock ();
732 now_floor = now;
492 } 733 }
493 734
494 periodics_reschedule (diff - odiff); 735 periodics_reschedule (diff - odiff);
495 /* no timer adjustment, as the monotonic clock doesn't jump */ 736 /* no timer adjustment, as the monotonic clock doesn't jump */
737 }
496 } 738 }
497 else 739 else
740#endif
498 { 741 {
742 ev_now = ev_time ();
743
499 if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP) 744 if (expect_false (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
500 { 745 {
501 periodics_reschedule (ev_now - now); 746 periodics_reschedule (ev_now - now);
502 747
503 /* adjust timers. this is easy, as the offset is the same for all */ 748 /* adjust timers. this is easy, as the offset is the same for all */
504 for (i = 0; i < timercnt; ++i) 749 for (i = 0; i < timercnt; ++i)
… …
512int ev_loop_done; 757int ev_loop_done;
513 758
514void ev_loop (int flags) 759void ev_loop (int flags)
515{ 760{
516 double block; 761 double block;
517 ev_loop_done = flags & EVLOOP_ONESHOT ? 1 : 0; 762 ev_loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
518
519 if (checkcnt)
520 {
521 queue_events ((W *)checks, checkcnt, EV_CHECK);
522 call_pending ();
523 }
524 763
525 do 764 do
526 { 765 {
766 /* queue check watchers (and execute them) */
767 if (expect_false (preparecnt))
768 {
769 queue_events ((W *)prepares, preparecnt, EV_PREPARE);
770 call_pending ();
771 }
772
527 /* update fd-related kernel structures */ 773 /* update fd-related kernel structures */
528 fd_reify (); 774 fd_reify ();
529 775
530 /* calculate blocking time */ 776 /* calculate blocking time */
531 777
532 /* we only need this for !monotonic clock, but as we always have timers, we just calculate it every time */ 778 /* we only need this for !monotonic clockor timers, but as we basically
779 always have timers, we just calculate it always */
780#if EV_USE_MONOTONIC
781 if (expect_true (have_monotonic))
782 time_update_monotonic ();
783 else
784#endif
785 {
533 ev_now = ev_time (); 786 ev_now = ev_time ();
787 now = ev_now;
788 }
534 789
535 if (flags & EVLOOP_NONBLOCK || idlecnt) 790 if (flags & EVLOOP_NONBLOCK || idlecnt)
536 block = 0.; 791 block = 0.;
537 else 792 else
538 { 793 {
539 block = MAX_BLOCKTIME; 794 block = MAX_BLOCKTIME;
540 795
541 if (timercnt) 796 if (timercnt)
542 { 797 {
543 ev_tstamp to = timers [0]->at - get_clock () + method_fudge; 798 ev_tstamp to = timers [0]->at - now + method_fudge;
544 if (block > to) block = to; 799 if (block > to) block = to;
545 } 800 }
546 801
547 if (periodiccnt) 802 if (periodiccnt)
548 { 803 {
… …
557 812
558 /* update ev_now, do magic */ 813 /* update ev_now, do magic */
559 time_update (); 814 time_update ();
560 815
561 /* queue pending timers and reschedule them */ 816 /* queue pending timers and reschedule them */
817 timers_reify (); /* relative timers called last */
562 periodics_reify (); /* absolute timers first */ 818 periodics_reify (); /* absolute timers called first */
563 timers_reify (); /* relative timers second */
564 819
565 /* queue idle watchers unless io or timers are pending */ 820 /* queue idle watchers unless io or timers are pending */
566 if (!pendingcnt) 821 if (!pendingcnt)
567 queue_events ((W *)idles, idlecnt, EV_IDLE); 822 queue_events ((W *)idles, idlecnt, EV_IDLE);
568 823
569 /* queue check and possibly idle watchers */ 824 /* queue check watchers, to be executed first */
825 if (checkcnt)
570 queue_events ((W *)checks, checkcnt, EV_CHECK); 826 queue_events ((W *)checks, checkcnt, EV_CHECK);
571 827
572 call_pending (); 828 call_pending ();
573 } 829 }
574 while (!ev_loop_done); 830 while (!ev_loop_done);
575 831
… …
600 head = &(*head)->next; 856 head = &(*head)->next;
601 } 857 }
602} 858}
603 859
604static void 860static void
861ev_clear_pending (W w)
862{
863 if (w->pending)
864 {
865 pendings [ABSPRI (w)][w->pending - 1].w = 0;
866 w->pending = 0;
867 }
868}
869
870static void
605ev_start (W w, int active) 871ev_start (W w, int active)
606{ 872{
607 w->pending = 0; 873 if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
874 if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
875
608 w->active = active; 876 w->active = active;
609} 877}
610 878
611static void 879static void
612ev_stop (W w) 880ev_stop (W w)
613{ 881{
614 if (w->pending)
615 pendings [w->pending - 1].w = 0;
616
617 w->active = 0; 882 w->active = 0;
618} 883}
619 884
620/*****************************************************************************/ 885/*****************************************************************************/
621 886
622void 887void
623evio_start (struct ev_io *w) 888ev_io_start (struct ev_io *w)
624{ 889{
890 int fd = w->fd;
891
625 if (ev_is_active (w)) 892 if (ev_is_active (w))
626 return; 893 return;
627 894
628 int fd = w->fd; 895 assert (("ev_io_start called with negative fd", fd >= 0));
629 896
630 ev_start ((W)w, 1); 897 ev_start ((W)w, 1);
631 array_needsize (anfds, anfdmax, fd + 1, anfds_init); 898 array_needsize (anfds, anfdmax, fd + 1, anfds_init);
632 wlist_add ((WL *)&anfds[fd].head, (WL)w); 899 wlist_add ((WL *)&anfds[fd].head, (WL)w);
633 900
634 ++fdchangecnt; 901 fd_change (fd);
635 array_needsize (fdchanges, fdchangemax, fdchangecnt, );
636 fdchanges [fdchangecnt - 1] = fd;
637} 902}
638 903
639void 904void
640evio_stop (struct ev_io *w) 905ev_io_stop (struct ev_io *w)
641{ 906{
907 ev_clear_pending ((W)w);
642 if (!ev_is_active (w)) 908 if (!ev_is_active (w))
643 return; 909 return;
644 910
645 wlist_del ((WL *)&anfds[w->fd].head, (WL)w); 911 wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
646 ev_stop ((W)w); 912 ev_stop ((W)w);
647 913
648 ++fdchangecnt; 914 fd_change (w->fd);
649 array_needsize (fdchanges, fdchangemax, fdchangecnt, );
650 fdchanges [fdchangecnt - 1] = w->fd;
651} 915}
652 916
653
654void 917void
655evtimer_start (struct ev_timer *w) 918ev_timer_start (struct ev_timer *w)
656{ 919{
657 if (ev_is_active (w)) 920 if (ev_is_active (w))
658 return; 921 return;
659 922
660 w->at += now; 923 w->at += now;
661 924
662 assert (("timer repeat value less than zero not allowed", w->repeat >= 0.)); 925 assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
663 926
664 ev_start ((W)w, ++timercnt); 927 ev_start ((W)w, ++timercnt);
665 array_needsize (timers, timermax, timercnt, ); 928 array_needsize (timers, timermax, timercnt, );
666 timers [timercnt - 1] = w; 929 timers [timercnt - 1] = w;
667 upheap ((WT *)timers, timercnt - 1); 930 upheap ((WT *)timers, timercnt - 1);
668} 931}
669 932
670void 933void
671evtimer_stop (struct ev_timer *w) 934ev_timer_stop (struct ev_timer *w)
672{ 935{
936 ev_clear_pending ((W)w);
673 if (!ev_is_active (w)) 937 if (!ev_is_active (w))
674 return; 938 return;
675 939
676 if (w->active < timercnt--) 940 if (w->active < timercnt--)
677 { 941 {
678 timers [w->active - 1] = timers [timercnt]; 942 timers [w->active - 1] = timers [timercnt];
679 downheap ((WT *)timers, timercnt, w->active - 1); 943 downheap ((WT *)timers, timercnt, w->active - 1);
680 } 944 }
681 945
946 w->at = w->repeat;
947
682 ev_stop ((W)w); 948 ev_stop ((W)w);
683} 949}
684 950
685void 951void
686evperiodic_start (struct ev_periodic *w) 952ev_timer_again (struct ev_timer *w)
687{ 953{
688 if (ev_is_active (w)) 954 if (ev_is_active (w))
689 return; 955 {
956 if (w->repeat)
957 {
958 w->at = now + w->repeat;
959 downheap ((WT *)timers, timercnt, w->active - 1);
960 }
961 else
962 ev_timer_stop (w);
963 }
964 else if (w->repeat)
965 ev_timer_start (w);
966}
690 967
691 assert (("periodic interval value less than zero not allowed", w->interval >= 0.)); 968void
969ev_periodic_start (struct ev_periodic *w)
970{
971 if (ev_is_active (w))
972 return;
973
974 assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
692 975
693 /* this formula differs from the one in periodic_reify because we do not always round up */ 976 /* this formula differs from the one in periodic_reify because we do not always round up */
694 if (w->interval) 977 if (w->interval)
695 w->at += ceil ((ev_now - w->at) / w->interval) * w->interval; 978 w->at += ceil ((ev_now - w->at) / w->interval) * w->interval;
696 979
… …
699 periodics [periodiccnt - 1] = w; 982 periodics [periodiccnt - 1] = w;
700 upheap ((WT *)periodics, periodiccnt - 1); 983 upheap ((WT *)periodics, periodiccnt - 1);
701} 984}
702 985
703void 986void
704evperiodic_stop (struct ev_periodic *w) 987ev_periodic_stop (struct ev_periodic *w)
705{ 988{
989 ev_clear_pending ((W)w);
706 if (!ev_is_active (w)) 990 if (!ev_is_active (w))
707 return; 991 return;
708 992
709 if (w->active < periodiccnt--) 993 if (w->active < periodiccnt--)
710 { 994 {
… …
714 998
715 ev_stop ((W)w); 999 ev_stop ((W)w);
716} 1000}
717 1001
718void 1002void
719evsignal_start (struct ev_signal *w) 1003ev_signal_start (struct ev_signal *w)
720{ 1004{
721 if (ev_is_active (w)) 1005 if (ev_is_active (w))
722 return; 1006 return;
1007
1008 assert (("ev_signal_start called with illegal signal number", w->signum > 0));
723 1009
724 ev_start ((W)w, 1); 1010 ev_start ((W)w, 1);
725 array_needsize (signals, signalmax, w->signum, signals_init); 1011 array_needsize (signals, signalmax, w->signum, signals_init);
726 wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w); 1012 wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
727 1013
… …
734 sigaction (w->signum, &sa, 0); 1020 sigaction (w->signum, &sa, 0);
735 } 1021 }
736} 1022}
737 1023
738void 1024void
739evsignal_stop (struct ev_signal *w) 1025ev_signal_stop (struct ev_signal *w)
740{ 1026{
1027 ev_clear_pending ((W)w);
741 if (!ev_is_active (w)) 1028 if (!ev_is_active (w))
742 return; 1029 return;
743 1030
744 wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w); 1031 wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
745 ev_stop ((W)w); 1032 ev_stop ((W)w);
746 1033
747 if (!signals [w->signum - 1].head) 1034 if (!signals [w->signum - 1].head)
748 signal (w->signum, SIG_DFL); 1035 signal (w->signum, SIG_DFL);
749} 1036}
750 1037
1038void
751void evidle_start (struct ev_idle *w) 1039ev_idle_start (struct ev_idle *w)
752{ 1040{
753 if (ev_is_active (w)) 1041 if (ev_is_active (w))
754 return; 1042 return;
755 1043
756 ev_start ((W)w, ++idlecnt); 1044 ev_start ((W)w, ++idlecnt);
757 array_needsize (idles, idlemax, idlecnt, ); 1045 array_needsize (idles, idlemax, idlecnt, );
758 idles [idlecnt - 1] = w; 1046 idles [idlecnt - 1] = w;
759} 1047}
760 1048
1049void
761void evidle_stop (struct ev_idle *w) 1050ev_idle_stop (struct ev_idle *w)
762{ 1051{
1052 ev_clear_pending ((W)w);
1053 if (ev_is_active (w))
1054 return;
1055
763 idles [w->active - 1] = idles [--idlecnt]; 1056 idles [w->active - 1] = idles [--idlecnt];
764 ev_stop ((W)w); 1057 ev_stop ((W)w);
765} 1058}
766 1059
1060void
1061ev_prepare_start (struct ev_prepare *w)
1062{
1063 if (ev_is_active (w))
1064 return;
1065
1066 ev_start ((W)w, ++preparecnt);
1067 array_needsize (prepares, preparemax, preparecnt, );
1068 prepares [preparecnt - 1] = w;
1069}
1070
1071void
1072ev_prepare_stop (struct ev_prepare *w)
1073{
1074 ev_clear_pending ((W)w);
1075 if (ev_is_active (w))
1076 return;
1077
1078 prepares [w->active - 1] = prepares [--preparecnt];
1079 ev_stop ((W)w);
1080}
1081
1082void
767void evcheck_start (struct ev_check *w) 1083ev_check_start (struct ev_check *w)
768{ 1084{
769 if (ev_is_active (w)) 1085 if (ev_is_active (w))
770 return; 1086 return;
771 1087
772 ev_start ((W)w, ++checkcnt); 1088 ev_start ((W)w, ++checkcnt);
773 array_needsize (checks, checkmax, checkcnt, ); 1089 array_needsize (checks, checkmax, checkcnt, );
774 checks [checkcnt - 1] = w; 1090 checks [checkcnt - 1] = w;
775} 1091}
776 1092
1093void
777void evcheck_stop (struct ev_check *w) 1094ev_check_stop (struct ev_check *w)
778{ 1095{
1096 ev_clear_pending ((W)w);
1097 if (ev_is_active (w))
1098 return;
1099
779 checks [w->active - 1] = checks [--checkcnt]; 1100 checks [w->active - 1] = checks [--checkcnt];
780 ev_stop ((W)w); 1101 ev_stop ((W)w);
781} 1102}
782 1103
1104void
1105ev_child_start (struct ev_child *w)
1106{
1107 if (ev_is_active (w))
1108 return;
1109
1110 ev_start ((W)w, 1);
1111 wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
1112}
1113
1114void
1115ev_child_stop (struct ev_child *w)
1116{
1117 ev_clear_pending ((W)w);
1118 if (ev_is_active (w))
1119 return;
1120
1121 wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
1122 ev_stop ((W)w);
1123}
1124
1125/*****************************************************************************/
1126
1127struct ev_once
1128{
1129 struct ev_io io;
1130 struct ev_timer to;
1131 void (*cb)(int revents, void *arg);
1132 void *arg;
1133};
1134
1135static void
1136once_cb (struct ev_once *once, int revents)
1137{
1138 void (*cb)(int revents, void *arg) = once->cb;
1139 void *arg = once->arg;
1140
1141 ev_io_stop (&once->io);
1142 ev_timer_stop (&once->to);
1143 free (once);
1144
1145 cb (revents, arg);
1146}
1147
1148static void
1149once_cb_io (struct ev_io *w, int revents)
1150{
1151 once_cb ((struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
1152}
1153
1154static void
1155once_cb_to (struct ev_timer *w, int revents)
1156{
1157 once_cb ((struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
1158}
1159
1160void
1161ev_once (int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
1162{
1163 struct ev_once *once = malloc (sizeof (struct ev_once));
1164
1165 if (!once)
1166 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
1167 else
1168 {
1169 once->cb = cb;
1170 once->arg = arg;
1171
1172 ev_watcher_init (&once->io, once_cb_io);
1173 if (fd >= 0)
1174 {
1175 ev_io_set (&once->io, fd, events);
1176 ev_io_start (&once->io);
1177 }
1178
1179 ev_watcher_init (&once->to, once_cb_to);
1180 if (timeout >= 0.)
1181 {
1182 ev_timer_set (&once->to, timeout, 0.);
1183 ev_timer_start (&once->to);
1184 }
1185 }
1186}
1187
783/*****************************************************************************/ 1188/*****************************************************************************/
784 1189
785#if 0 1190#if 0
786 1191
787struct ev_io wio; 1192struct ev_io wio;
… …
794 1199
795static void 1200static void
796ocb (struct ev_timer *w, int revents) 1201ocb (struct ev_timer *w, int revents)
797{ 1202{
798 //fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data); 1203 //fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
799 evtimer_stop (w); 1204 ev_timer_stop (w);
800 evtimer_start (w); 1205 ev_timer_start (w);
801} 1206}
802 1207
803static void 1208static void
804scb (struct ev_signal *w, int revents) 1209scb (struct ev_signal *w, int revents)
805{ 1210{
806 fprintf (stderr, "signal %x,%d\n", revents, w->signum); 1211 fprintf (stderr, "signal %x,%d\n", revents, w->signum);
807 evio_stop (&wio); 1212 ev_io_stop (&wio);
808 evio_start (&wio); 1213 ev_io_start (&wio);
809} 1214}
810 1215
811static void 1216static void
812gcb (struct ev_signal *w, int revents) 1217gcb (struct ev_signal *w, int revents)
813{ 1218{
… …
817 1222
818int main (void) 1223int main (void)
819{ 1224{
820 ev_init (0); 1225 ev_init (0);
821 1226
822 evio_init (&wio, sin_cb, 0, EV_READ); 1227 ev_io_init (&wio, sin_cb, 0, EV_READ);
823 evio_start (&wio); 1228 ev_io_start (&wio);
824 1229
825 struct ev_timer t[10000]; 1230 struct ev_timer t[10000];
826 1231
827#if 0 1232#if 0
828 int i; 1233 int i;
829 for (i = 0; i < 10000; ++i) 1234 for (i = 0; i < 10000; ++i)
830 { 1235 {
831 struct ev_timer *w = t + i; 1236 struct ev_timer *w = t + i;
832 evw_init (w, ocb, i); 1237 ev_watcher_init (w, ocb, i);
833 evtimer_init_abs (w, ocb, drand48 (), 0.99775533); 1238 ev_timer_init_abs (w, ocb, drand48 (), 0.99775533);
834 evtimer_start (w); 1239 ev_timer_start (w);
835 if (drand48 () < 0.5) 1240 if (drand48 () < 0.5)
836 evtimer_stop (w); 1241 ev_timer_stop (w);
837 } 1242 }
838#endif 1243#endif
839 1244
840 struct ev_timer t1; 1245 struct ev_timer t1;
841 evtimer_init (&t1, ocb, 5, 10); 1246 ev_timer_init (&t1, ocb, 5, 10);
842 evtimer_start (&t1); 1247 ev_timer_start (&t1);
843 1248
844 struct ev_signal sig; 1249 struct ev_signal sig;
845 evsignal_init (&sig, scb, SIGQUIT); 1250 ev_signal_init (&sig, scb, SIGQUIT);
846 evsignal_start (&sig); 1251 ev_signal_start (&sig);
847 1252
848 struct ev_check cw; 1253 struct ev_check cw;
849 evcheck_init (&cw, gcb); 1254 ev_check_init (&cw, gcb);
850 evcheck_start (&cw); 1255 ev_check_start (&cw);
851 1256
852 struct ev_idle iw; 1257 struct ev_idle iw;
853 evidle_init (&iw, gcb); 1258 ev_idle_init (&iw, gcb);
854 evidle_start (&iw); 1259 ev_idle_start (&iw);
855 1260
856 ev_loop (0); 1261 ev_loop (0);
857 1262
858 return 0; 1263 return 0;
859} 1264}

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