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Comparing libev/ev.c (file contents):
Revision 1.16 by root, Wed Oct 31 13:57:34 2007 UTC vs.
Revision 1.43 by root, Fri Nov 2 20:21:33 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>
… …
7 41
8#include <stdio.h> 42#include <stdio.h>
9 43
10#include <assert.h> 44#include <assert.h>
11#include <errno.h> 45#include <errno.h>
46#include <sys/types.h>
47#include <sys/wait.h>
12#include <sys/time.h> 48#include <sys/time.h>
13#include <time.h> 49#include <time.h>
14 50
15#define HAVE_EPOLL 1 51/**/
16 52
17#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_REALTIME
70# define EV_USE_REALTIME 1
71#endif
72
73/**/
74
18# ifdef CLOCK_MONOTONIC 75#ifndef CLOCK_MONOTONIC
76# undef EV_USE_MONOTONIC
19# define HAVE_MONOTONIC 1 77# define EV_USE_MONOTONIC 0
20# endif 78#endif
21#endif
22 79
23#ifndef HAVE_SELECT
24# define HAVE_SELECT 1
25#endif
26
27#ifndef HAVE_EPOLL
28# define HAVE_EPOLL 0
29#endif
30
31#ifndef HAVE_REALTIME 80#ifndef CLOCK_REALTIME
32# define HAVE_REALTIME 1 /* posix requirement, but might be slower */ 81# undef EV_USE_REALTIME
82# define EV_USE_REALTIME 0
33#endif 83#endif
84
85/**/
34 86
35#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */ 87#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
36#define MAX_BLOCKTIME 60. 88#define MAX_BLOCKTIME 59.731 /* never wait longer than this time (to detect time jumps) */
89#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
90/*#define CLEANUP_INTERVAL 300. /* how often to try to free memory and re-check fds */
37 91
38#include "ev.h" 92#include "ev.h"
93
94#if __GNUC__ >= 3
95# define expect(expr,value) __builtin_expect ((expr),(value))
96# define inline inline
97#else
98# define expect(expr,value) (expr)
99# define inline static
100#endif
101
102#define expect_false(expr) expect ((expr) != 0, 0)
103#define expect_true(expr) expect ((expr) != 0, 1)
104
105#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
106#define ABSPRI(w) ((w)->priority - EV_MINPRI)
39 107
40typedef struct ev_watcher *W; 108typedef struct ev_watcher *W;
41typedef struct ev_watcher_list *WL; 109typedef struct ev_watcher_list *WL;
42typedef struct ev_watcher_time *WT; 110typedef struct ev_watcher_time *WT;
43 111
44static ev_tstamp now, diff; /* monotonic clock */ 112static ev_tstamp now_floor, now, diff; /* monotonic clock */
45ev_tstamp ev_now; 113ev_tstamp ev_now;
46int ev_method; 114int ev_method;
47 115
48static int have_monotonic; /* runtime */ 116static int have_monotonic; /* runtime */
49 117
… …
54/*****************************************************************************/ 122/*****************************************************************************/
55 123
56ev_tstamp 124ev_tstamp
57ev_time (void) 125ev_time (void)
58{ 126{
59#if HAVE_REALTIME 127#if EV_USE_REALTIME
60 struct timespec ts; 128 struct timespec ts;
61 clock_gettime (CLOCK_REALTIME, &ts); 129 clock_gettime (CLOCK_REALTIME, &ts);
62 return ts.tv_sec + ts.tv_nsec * 1e-9; 130 return ts.tv_sec + ts.tv_nsec * 1e-9;
63#else 131#else
64 struct timeval tv; 132 struct timeval tv;
… …
68} 136}
69 137
70static ev_tstamp 138static ev_tstamp
71get_clock (void) 139get_clock (void)
72{ 140{
73#if HAVE_MONOTONIC 141#if EV_USE_MONOTONIC
74 if (have_monotonic) 142 if (expect_true (have_monotonic))
75 { 143 {
76 struct timespec ts; 144 struct timespec ts;
77 clock_gettime (CLOCK_MONOTONIC, &ts); 145 clock_gettime (CLOCK_MONOTONIC, &ts);
78 return ts.tv_sec + ts.tv_nsec * 1e-9; 146 return ts.tv_sec + ts.tv_nsec * 1e-9;
79 } 147 }
80#endif 148#endif
81 149
82 return ev_time (); 150 return ev_time ();
83} 151}
84 152
153#define array_roundsize(base,n) ((n) | 4 & ~3)
154
85#define array_needsize(base,cur,cnt,init) \ 155#define array_needsize(base,cur,cnt,init) \
86 if ((cnt) > cur) \ 156 if (expect_false ((cnt) > cur)) \
87 { \ 157 { \
88 int newcnt = cur ? cur << 1 : 16; \ 158 int newcnt = cur; \
159 do \
160 { \
161 newcnt = array_roundsize (base, newcnt << 1); \
162 } \
163 while ((cnt) > newcnt); \
164 \
89 base = realloc (base, sizeof (*base) * (newcnt)); \ 165 base = realloc (base, sizeof (*base) * (newcnt)); \
90 init (base + cur, newcnt - cur); \ 166 init (base + cur, newcnt - cur); \
91 cur = newcnt; \ 167 cur = newcnt; \
92 } 168 }
93 169
94/*****************************************************************************/ 170/*****************************************************************************/
95 171
96typedef struct 172typedef struct
97{ 173{
98 struct ev_io *head; 174 struct ev_io *head;
99 unsigned char wev, rev; /* want, received event set */ 175 unsigned char events;
176 unsigned char reify;
100} ANFD; 177} ANFD;
101 178
102static ANFD *anfds; 179static ANFD *anfds;
103static int anfdmax; 180static int anfdmax;
104 181
105static int *fdchanges;
106static int fdchangemax, fdchangecnt;
107
108static void 182static void
109anfds_init (ANFD *base, int count) 183anfds_init (ANFD *base, int count)
110{ 184{
111 while (count--) 185 while (count--)
112 { 186 {
113 base->head = 0; 187 base->head = 0;
114 base->wev = base->rev = EV_NONE; 188 base->events = EV_NONE;
189 base->reify = 0;
190
115 ++base; 191 ++base;
116 } 192 }
117} 193}
118 194
119typedef struct 195typedef struct
120{ 196{
121 W w; 197 W w;
122 int events; 198 int events;
123} ANPENDING; 199} ANPENDING;
124 200
125static ANPENDING *pendings; 201static ANPENDING *pendings [NUMPRI];
126static int pendingmax, pendingcnt; 202static int pendingmax [NUMPRI], pendingcnt [NUMPRI];
127 203
128static void 204static void
129event (W w, int events) 205event (W w, int events)
130{ 206{
131 if (w->active) 207 if (w->pending)
132 { 208 {
133 w->pending = ++pendingcnt;
134 array_needsize (pendings, pendingmax, pendingcnt, );
135 pendings [pendingcnt - 1].w = w;
136 pendings [pendingcnt - 1].events = events; 209 pendings [ABSPRI (w)][w->pending - 1].events |= events;
210 return;
137 } 211 }
212
213 w->pending = ++pendingcnt [ABSPRI (w)];
214 array_needsize (pendings [ABSPRI (w)], pendingmax [ABSPRI (w)], pendingcnt [ABSPRI (w)], );
215 pendings [ABSPRI (w)][w->pending - 1].w = w;
216 pendings [ABSPRI (w)][w->pending - 1].events = events;
217}
218
219static void
220queue_events (W *events, int eventcnt, int type)
221{
222 int i;
223
224 for (i = 0; i < eventcnt; ++i)
225 event (events [i], type);
138} 226}
139 227
140static void 228static void
141fd_event (int fd, int events) 229fd_event (int fd, int events)
142{ 230{
… …
150 if (ev) 238 if (ev)
151 event ((W)w, ev); 239 event ((W)w, ev);
152 } 240 }
153} 241}
154 242
243/*****************************************************************************/
244
245static int *fdchanges;
246static int fdchangemax, fdchangecnt;
247
155static void 248static void
156queue_events (W *events, int eventcnt, int type) 249fd_reify (void)
157{ 250{
158 int i; 251 int i;
159 252
160 for (i = 0; i < eventcnt; ++i) 253 for (i = 0; i < fdchangecnt; ++i)
161 event (events [i], type); 254 {
255 int fd = fdchanges [i];
256 ANFD *anfd = anfds + fd;
257 struct ev_io *w;
258
259 int events = 0;
260
261 for (w = anfd->head; w; w = w->next)
262 events |= w->events;
263
264 anfd->reify = 0;
265
266 if (anfd->events != events)
267 {
268 method_modify (fd, anfd->events, events);
269 anfd->events = events;
270 }
271 }
272
273 fdchangecnt = 0;
274}
275
276static void
277fd_change (int fd)
278{
279 if (anfds [fd].reify || fdchangecnt < 0)
280 return;
281
282 anfds [fd].reify = 1;
283
284 ++fdchangecnt;
285 array_needsize (fdchanges, fdchangemax, fdchangecnt, );
286 fdchanges [fdchangecnt - 1] = fd;
287}
288
289static void
290fd_kill (int fd)
291{
292 struct ev_io *w;
293
294 printf ("killing fd %d\n", fd);//D
295 while ((w = anfds [fd].head))
296 {
297 ev_io_stop (w);
298 event ((W)w, EV_ERROR | EV_READ | EV_WRITE);
299 }
300}
301
302/* called on EBADF to verify fds */
303static void
304fd_ebadf (void)
305{
306 int fd;
307
308 for (fd = 0; fd < anfdmax; ++fd)
309 if (anfds [fd].events)
310 if (fcntl (fd, F_GETFD) == -1 && errno == EBADF)
311 fd_kill (fd);
312}
313
314/* called on ENOMEM in select/poll to kill some fds and retry */
315static void
316fd_enomem (void)
317{
318 int fd = anfdmax;
319
320 while (fd--)
321 if (anfds [fd].events)
322 {
323 close (fd);
324 fd_kill (fd);
325 return;
326 }
162} 327}
163 328
164/*****************************************************************************/ 329/*****************************************************************************/
165 330
166static struct ev_timer **timers; 331static struct ev_timer **timers;
… …
213/*****************************************************************************/ 378/*****************************************************************************/
214 379
215typedef struct 380typedef struct
216{ 381{
217 struct ev_signal *head; 382 struct ev_signal *head;
218 sig_atomic_t gotsig; 383 sig_atomic_t volatile gotsig;
219} ANSIG; 384} ANSIG;
220 385
221static ANSIG *signals; 386static ANSIG *signals;
222static int signalmax; 387static int signalmax;
223 388
224static int sigpipe [2]; 389static int sigpipe [2];
225static sig_atomic_t gotsig; 390static sig_atomic_t volatile gotsig;
226static struct ev_io sigev; 391static struct ev_io sigev;
227 392
228static void 393static void
229signals_init (ANSIG *base, int count) 394signals_init (ANSIG *base, int count)
230{ 395{
231 while (count--) 396 while (count--)
232 { 397 {
233 base->head = 0; 398 base->head = 0;
234 base->gotsig = 0; 399 base->gotsig = 0;
400
235 ++base; 401 ++base;
236 } 402 }
237} 403}
238 404
239static void 405static void
… …
242 signals [signum - 1].gotsig = 1; 408 signals [signum - 1].gotsig = 1;
243 409
244 if (!gotsig) 410 if (!gotsig)
245 { 411 {
246 gotsig = 1; 412 gotsig = 1;
247 write (sigpipe [1], &gotsig, 1); 413 write (sigpipe [1], &signum, 1);
248 } 414 }
249} 415}
250 416
251static void 417static void
252sigcb (struct ev_io *iow, int revents) 418sigcb (struct ev_io *iow, int revents)
253{ 419{
254 struct ev_signal *w; 420 struct ev_signal *w;
255 int sig; 421 int signum;
256 422
423 read (sigpipe [0], &revents, 1);
257 gotsig = 0; 424 gotsig = 0;
258 read (sigpipe [0], &revents, 1);
259 425
260 for (sig = signalmax; sig--; ) 426 for (signum = signalmax; signum--; )
261 if (signals [sig].gotsig) 427 if (signals [signum].gotsig)
262 { 428 {
263 signals [sig].gotsig = 0; 429 signals [signum].gotsig = 0;
264 430
265 for (w = signals [sig].head; w; w = w->next) 431 for (w = signals [signum].head; w; w = w->next)
266 event ((W)w, EV_SIGNAL); 432 event ((W)w, EV_SIGNAL);
267 } 433 }
268} 434}
269 435
270static void 436static void
… …
275 441
276 /* rather than sort out wether we really need nb, set it */ 442 /* rather than sort out wether we really need nb, set it */
277 fcntl (sigpipe [0], F_SETFL, O_NONBLOCK); 443 fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
278 fcntl (sigpipe [1], F_SETFL, O_NONBLOCK); 444 fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
279 445
280 evio_set (&sigev, sigpipe [0], EV_READ); 446 ev_io_set (&sigev, sigpipe [0], EV_READ);
281 evio_start (&sigev); 447 ev_io_start (&sigev);
282} 448}
283 449
284/*****************************************************************************/ 450/*****************************************************************************/
285 451
286static struct ev_idle **idles; 452static struct ev_idle **idles;
287static int idlemax, idlecnt; 453static int idlemax, idlecnt;
288 454
455static struct ev_prepare **prepares;
456static int preparemax, preparecnt;
457
289static struct ev_check **checks; 458static struct ev_check **checks;
290static int checkmax, checkcnt; 459static int checkmax, checkcnt;
291 460
292/*****************************************************************************/ 461/*****************************************************************************/
293 462
463static struct ev_child *childs [PID_HASHSIZE];
464static struct ev_signal childev;
465
466#ifndef WCONTINUED
467# define WCONTINUED 0
468#endif
469
470static void
471childcb (struct ev_signal *sw, int revents)
472{
473 struct ev_child *w;
474 int pid, status;
475
476 while ((pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)) != -1)
477 for (w = childs [pid & (PID_HASHSIZE - 1)]; w; w = w->next)
478 if (w->pid == pid || !w->pid)
479 {
480 w->status = status;
481 event ((W)w, EV_CHILD);
482 }
483}
484
485/*****************************************************************************/
486
294#if HAVE_EPOLL 487#if EV_USE_EPOLL
295# include "ev_epoll.c" 488# include "ev_epoll.c"
296#endif 489#endif
490#if EV_USE_POLL
491# include "ev_poll.c"
492#endif
297#if HAVE_SELECT 493#if EV_USE_SELECT
298# include "ev_select.c" 494# include "ev_select.c"
299#endif 495#endif
300 496
497int
498ev_version_major (void)
499{
500 return EV_VERSION_MAJOR;
501}
502
503int
504ev_version_minor (void)
505{
506 return EV_VERSION_MINOR;
507}
508
509/* return true if we are running with elevated privileges and ignore env variables */
510static int
511enable_secure ()
512{
513 return getuid () != geteuid ()
514 || getgid () != getegid ();
515}
516
301int ev_init (int flags) 517int ev_init (int methods)
302{ 518{
303#if HAVE_MONOTONIC
304 {
305 struct timespec ts;
306 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
307 have_monotonic = 1;
308 }
309#endif
310
311 ev_now = ev_time ();
312 now = get_clock ();
313 diff = ev_now - now;
314
315 if (pipe (sigpipe))
316 return 0;
317
318 ev_method = EVMETHOD_NONE;
319#if HAVE_EPOLL
320 if (ev_method == EVMETHOD_NONE) epoll_init (flags);
321#endif
322#if HAVE_SELECT
323 if (ev_method == EVMETHOD_NONE) select_init (flags);
324#endif
325
326 if (ev_method) 519 if (!ev_method)
520 {
521#if EV_USE_MONOTONIC
327 { 522 {
523 struct timespec ts;
524 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
525 have_monotonic = 1;
526 }
527#endif
528
529 ev_now = ev_time ();
530 now = get_clock ();
531 now_floor = now;
532 diff = ev_now - now;
533
534 if (pipe (sigpipe))
535 return 0;
536
537 if (methods == EVMETHOD_AUTO)
538 if (!enable_secure () && getenv ("LIBEV_METHODS"))
539 methods = atoi (getenv ("LIBEV_METHODS"));
540 else
541 methods = EVMETHOD_ANY;
542
543 ev_method = 0;
544#if EV_USE_EPOLL
545 if (!ev_method && (methods & EVMETHOD_EPOLL )) epoll_init (methods);
546#endif
547#if EV_USE_POLL
548 if (!ev_method && (methods & EVMETHOD_POLL )) poll_init (methods);
549#endif
550#if EV_USE_SELECT
551 if (!ev_method && (methods & EVMETHOD_SELECT)) select_init (methods);
552#endif
553
554 if (ev_method)
555 {
328 evw_init (&sigev, sigcb); 556 ev_watcher_init (&sigev, sigcb);
329 siginit (); 557 siginit ();
558
559 ev_signal_init (&childev, childcb, SIGCHLD);
560 ev_signal_start (&childev);
561 }
330 } 562 }
331 563
332 return ev_method; 564 return ev_method;
333} 565}
334 566
335/*****************************************************************************/ 567/*****************************************************************************/
336 568
337void ev_prefork (void) 569void
570ev_fork_prepare (void)
338{ 571{
339 /* nop */ 572 /* nop */
340} 573}
341 574
575void
342void ev_postfork_parent (void) 576ev_fork_parent (void)
343{ 577{
344 /* nop */ 578 /* nop */
345} 579}
346 580
581void
347void ev_postfork_child (void) 582ev_fork_child (void)
348{ 583{
349#if HAVE_EPOLL 584#if EV_USE_EPOLL
350 if (ev_method == EVMETHOD_EPOLL) 585 if (ev_method == EVMETHOD_EPOLL)
351 epoll_postfork_child (); 586 epoll_postfork_child ();
352#endif 587#endif
353 588
354 evio_stop (&sigev); 589 ev_io_stop (&sigev);
355 close (sigpipe [0]); 590 close (sigpipe [0]);
356 close (sigpipe [1]); 591 close (sigpipe [1]);
357 pipe (sigpipe); 592 pipe (sigpipe);
358 siginit (); 593 siginit ();
359} 594}
360 595
361/*****************************************************************************/ 596/*****************************************************************************/
362 597
363static void 598static void
364fd_reify (void) 599call_pending (void)
365{ 600{
366 int i; 601 int pri;
367 602
368 for (i = 0; i < fdchangecnt; ++i) 603 for (pri = NUMPRI; pri--; )
369 { 604 while (pendingcnt [pri])
370 int fd = fdchanges [i];
371 ANFD *anfd = anfds + fd;
372 struct ev_io *w;
373
374 int wev = 0;
375
376 for (w = anfd->head; w; w = w->next)
377 wev |= w->events;
378
379 if (anfd->wev != wev)
380 { 605 {
381 method_modify (fd, anfd->wev, wev); 606 ANPENDING *p = pendings [pri] + --pendingcnt [pri];
382 anfd->wev = wev;
383 }
384 }
385 607
386 fdchangecnt = 0;
387}
388
389static void
390call_pending ()
391{
392 int i;
393
394 for (i = 0; i < pendingcnt; ++i)
395 {
396 ANPENDING *p = pendings + i;
397
398 if (p->w) 608 if (p->w)
399 { 609 {
400 p->w->pending = 0; 610 p->w->pending = 0;
401 p->w->cb (p->w, p->events); 611 p->w->cb (p->w, p->events);
402 } 612 }
403 } 613 }
404
405 pendingcnt = 0;
406} 614}
407 615
408static void 616static void
409timers_reify () 617timers_reify (void)
410{ 618{
411 while (timercnt && timers [0]->at <= now) 619 while (timercnt && timers [0]->at <= now)
412 { 620 {
413 struct ev_timer *w = timers [0]; 621 struct ev_timer *w = timers [0];
414
415 event ((W)w, EV_TIMEOUT);
416 622
417 /* first reschedule or stop timer */ 623 /* first reschedule or stop timer */
418 if (w->repeat) 624 if (w->repeat)
419 { 625 {
626 assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
420 w->at = now + w->repeat; 627 w->at = now + w->repeat;
421 assert (("timer timeout in the past, negative repeat?", w->at > now));
422 downheap ((WT *)timers, timercnt, 0); 628 downheap ((WT *)timers, timercnt, 0);
423 } 629 }
424 else 630 else
425 evtimer_stop (w); /* nonrepeating: stop timer */ 631 ev_timer_stop (w); /* nonrepeating: stop timer */
426 }
427}
428 632
633 event ((W)w, EV_TIMEOUT);
634 }
635}
636
429static void 637static void
430periodics_reify () 638periodics_reify (void)
431{ 639{
432 while (periodiccnt && periodics [0]->at <= ev_now) 640 while (periodiccnt && periodics [0]->at <= ev_now)
433 { 641 {
434 struct ev_periodic *w = periodics [0]; 642 struct ev_periodic *w = periodics [0];
435 643
436 /* first reschedule or stop timer */ 644 /* first reschedule or stop timer */
437 if (w->interval) 645 if (w->interval)
438 { 646 {
439 w->at += floor ((ev_now - w->at) / w->interval + 1.) * w->interval; 647 w->at += floor ((ev_now - w->at) / w->interval + 1.) * w->interval;
440 assert (("periodic timeout in the past, negative interval?", w->at > ev_now)); 648 assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", w->at > ev_now));
441 downheap ((WT *)periodics, periodiccnt, 0); 649 downheap ((WT *)periodics, periodiccnt, 0);
442 } 650 }
443 else 651 else
444 evperiodic_stop (w); /* nonrepeating: stop timer */ 652 ev_periodic_stop (w); /* nonrepeating: stop timer */
445 653
446 event ((W)w, EV_TIMEOUT); 654 event ((W)w, EV_PERIODIC);
447 } 655 }
448} 656}
449 657
450static void 658static void
451periodics_reschedule (ev_tstamp diff) 659periodics_reschedule (ev_tstamp diff)
… …
461 { 669 {
462 ev_tstamp diff = ceil ((ev_now - w->at) / w->interval) * w->interval; 670 ev_tstamp diff = ceil ((ev_now - w->at) / w->interval) * w->interval;
463 671
464 if (fabs (diff) >= 1e-4) 672 if (fabs (diff) >= 1e-4)
465 { 673 {
466 evperiodic_stop (w); 674 ev_periodic_stop (w);
467 evperiodic_start (w); 675 ev_periodic_start (w);
468 676
469 i = 0; /* restart loop, inefficient, but time jumps should be rare */ 677 i = 0; /* restart loop, inefficient, but time jumps should be rare */
470 } 678 }
471 } 679 }
472 } 680 }
473} 681}
474 682
475static void 683static int
684time_update_monotonic (void)
685{
686 now = get_clock ();
687
688 if (expect_true (now - now_floor < MIN_TIMEJUMP * .5))
689 {
690 ev_now = now + diff;
691 return 0;
692 }
693 else
694 {
695 now_floor = now;
696 ev_now = ev_time ();
697 return 1;
698 }
699}
700
701static void
476time_update () 702time_update (void)
477{ 703{
478 int i; 704 int i;
479 705
480 ev_now = ev_time (); 706#if EV_USE_MONOTONIC
481
482 if (have_monotonic) 707 if (expect_true (have_monotonic))
483 { 708 {
709 if (time_update_monotonic ())
710 {
484 ev_tstamp odiff = diff; 711 ev_tstamp odiff = diff;
485 712
486 for (i = 4; --i; ) /* loop a few times, before making important decisions */ 713 for (i = 4; --i; ) /* loop a few times, before making important decisions */
487 { 714 {
488 now = get_clock ();
489 diff = ev_now - now; 715 diff = ev_now - now;
490 716
491 if (fabs (odiff - diff) < MIN_TIMEJUMP) 717 if (fabs (odiff - diff) < MIN_TIMEJUMP)
492 return; /* all is well */ 718 return; /* all is well */
493 719
494 ev_now = ev_time (); 720 ev_now = ev_time ();
721 now = get_clock ();
722 now_floor = now;
495 } 723 }
496 724
497 periodics_reschedule (diff - odiff); 725 periodics_reschedule (diff - odiff);
498 /* no timer adjustment, as the monotonic clock doesn't jump */ 726 /* no timer adjustment, as the monotonic clock doesn't jump */
727 }
499 } 728 }
500 else 729 else
730#endif
501 { 731 {
732 ev_now = ev_time ();
733
502 if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP) 734 if (expect_false (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
503 { 735 {
504 periodics_reschedule (ev_now - now); 736 periodics_reschedule (ev_now - now);
505 737
506 /* adjust timers. this is easy, as the offset is the same for all */ 738 /* adjust timers. this is easy, as the offset is the same for all */
507 for (i = 0; i < timercnt; ++i) 739 for (i = 0; i < timercnt; ++i)
… …
515int ev_loop_done; 747int ev_loop_done;
516 748
517void ev_loop (int flags) 749void ev_loop (int flags)
518{ 750{
519 double block; 751 double block;
520 ev_loop_done = flags & EVLOOP_ONESHOT ? 1 : 0; 752 ev_loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
521
522 if (checkcnt)
523 {
524 queue_events ((W *)checks, checkcnt, EV_CHECK);
525 call_pending ();
526 }
527 753
528 do 754 do
529 { 755 {
756 /* queue check watchers (and execute them) */
757 if (expect_false (preparecnt))
758 {
759 queue_events ((W *)prepares, preparecnt, EV_PREPARE);
760 call_pending ();
761 }
762
530 /* update fd-related kernel structures */ 763 /* update fd-related kernel structures */
531 fd_reify (); 764 fd_reify ();
532 765
533 /* calculate blocking time */ 766 /* calculate blocking time */
534 767
535 /* we only need this for !monotonic clock, but as we always have timers, we just calculate it every time */ 768 /* we only need this for !monotonic clockor timers, but as we basically
769 always have timers, we just calculate it always */
770#if EV_USE_MONOTONIC
771 if (expect_true (have_monotonic))
772 time_update_monotonic ();
773 else
774#endif
775 {
536 ev_now = ev_time (); 776 ev_now = ev_time ();
777 now = ev_now;
778 }
537 779
538 if (flags & EVLOOP_NONBLOCK || idlecnt) 780 if (flags & EVLOOP_NONBLOCK || idlecnt)
539 block = 0.; 781 block = 0.;
540 else 782 else
541 { 783 {
542 block = MAX_BLOCKTIME; 784 block = MAX_BLOCKTIME;
543 785
544 if (timercnt) 786 if (timercnt)
545 { 787 {
546 ev_tstamp to = timers [0]->at - (have_monotonic ? get_clock () : ev_now) + method_fudge; 788 ev_tstamp to = timers [0]->at - now + method_fudge;
547 if (block > to) block = to; 789 if (block > to) block = to;
548 } 790 }
549 791
550 if (periodiccnt) 792 if (periodiccnt)
551 { 793 {
… …
560 802
561 /* update ev_now, do magic */ 803 /* update ev_now, do magic */
562 time_update (); 804 time_update ();
563 805
564 /* queue pending timers and reschedule them */ 806 /* queue pending timers and reschedule them */
807 timers_reify (); /* relative timers called last */
565 periodics_reify (); /* absolute timers first */ 808 periodics_reify (); /* absolute timers called first */
566 timers_reify (); /* relative timers second */
567 809
568 /* queue idle watchers unless io or timers are pending */ 810 /* queue idle watchers unless io or timers are pending */
569 if (!pendingcnt) 811 if (!pendingcnt)
570 queue_events ((W *)idles, idlecnt, EV_IDLE); 812 queue_events ((W *)idles, idlecnt, EV_IDLE);
571 813
572 /* queue check and possibly idle watchers */ 814 /* queue check watchers, to be executed first */
815 if (checkcnt)
573 queue_events ((W *)checks, checkcnt, EV_CHECK); 816 queue_events ((W *)checks, checkcnt, EV_CHECK);
574 817
575 call_pending (); 818 call_pending ();
576 } 819 }
577 while (!ev_loop_done); 820 while (!ev_loop_done);
578 821
… …
603 head = &(*head)->next; 846 head = &(*head)->next;
604 } 847 }
605} 848}
606 849
607static void 850static void
608ev_clear (W w) 851ev_clear_pending (W w)
609{ 852{
610 if (w->pending) 853 if (w->pending)
611 { 854 {
612 pendings [w->pending - 1].w = 0; 855 pendings [ABSPRI (w)][w->pending - 1].w = 0;
613 w->pending = 0; 856 w->pending = 0;
614 } 857 }
615} 858}
616 859
617static void 860static void
618ev_start (W w, int active) 861ev_start (W w, int active)
619{ 862{
863 if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
864 if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
865
620 w->active = active; 866 w->active = active;
621} 867}
622 868
623static void 869static void
624ev_stop (W w) 870ev_stop (W w)
… …
627} 873}
628 874
629/*****************************************************************************/ 875/*****************************************************************************/
630 876
631void 877void
632evio_start (struct ev_io *w) 878ev_io_start (struct ev_io *w)
633{ 879{
880 int fd = w->fd;
881
634 if (ev_is_active (w)) 882 if (ev_is_active (w))
635 return; 883 return;
636 884
637 int fd = w->fd; 885 assert (("ev_io_start called with negative fd", fd >= 0));
638 886
639 ev_start ((W)w, 1); 887 ev_start ((W)w, 1);
640 array_needsize (anfds, anfdmax, fd + 1, anfds_init); 888 array_needsize (anfds, anfdmax, fd + 1, anfds_init);
641 wlist_add ((WL *)&anfds[fd].head, (WL)w); 889 wlist_add ((WL *)&anfds[fd].head, (WL)w);
642 890
643 ++fdchangecnt; 891 fd_change (fd);
644 array_needsize (fdchanges, fdchangemax, fdchangecnt, );
645 fdchanges [fdchangecnt - 1] = fd;
646} 892}
647 893
648void 894void
649evio_stop (struct ev_io *w) 895ev_io_stop (struct ev_io *w)
650{ 896{
651 ev_clear ((W)w); 897 ev_clear_pending ((W)w);
652 if (!ev_is_active (w)) 898 if (!ev_is_active (w))
653 return; 899 return;
654 900
655 wlist_del ((WL *)&anfds[w->fd].head, (WL)w); 901 wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
656 ev_stop ((W)w); 902 ev_stop ((W)w);
657 903
658 ++fdchangecnt; 904 fd_change (w->fd);
659 array_needsize (fdchanges, fdchangemax, fdchangecnt, );
660 fdchanges [fdchangecnt - 1] = w->fd;
661} 905}
662 906
663void 907void
664evtimer_start (struct ev_timer *w) 908ev_timer_start (struct ev_timer *w)
665{ 909{
666 if (ev_is_active (w)) 910 if (ev_is_active (w))
667 return; 911 return;
668 912
669 w->at += now; 913 w->at += now;
670 914
671 assert (("timer repeat value less than zero not allowed", w->repeat >= 0.)); 915 assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
672 916
673 ev_start ((W)w, ++timercnt); 917 ev_start ((W)w, ++timercnt);
674 array_needsize (timers, timermax, timercnt, ); 918 array_needsize (timers, timermax, timercnt, );
675 timers [timercnt - 1] = w; 919 timers [timercnt - 1] = w;
676 upheap ((WT *)timers, timercnt - 1); 920 upheap ((WT *)timers, timercnt - 1);
677} 921}
678 922
679void 923void
680evtimer_stop (struct ev_timer *w) 924ev_timer_stop (struct ev_timer *w)
681{ 925{
682 ev_clear ((W)w); 926 ev_clear_pending ((W)w);
683 if (!ev_is_active (w)) 927 if (!ev_is_active (w))
684 return; 928 return;
685 929
686 if (w->active < timercnt--) 930 if (w->active < timercnt--)
687 { 931 {
… …
693 937
694 ev_stop ((W)w); 938 ev_stop ((W)w);
695} 939}
696 940
697void 941void
698evtimer_again (struct ev_timer *w) 942ev_timer_again (struct ev_timer *w)
699{ 943{
700 if (ev_is_active (w)) 944 if (ev_is_active (w))
701 { 945 {
702 if (w->repeat) 946 if (w->repeat)
703 { 947 {
704 w->at = now + w->repeat; 948 w->at = now + w->repeat;
705 downheap ((WT *)timers, timercnt, w->active - 1); 949 downheap ((WT *)timers, timercnt, w->active - 1);
706 } 950 }
707 else 951 else
708 evtimer_stop (w); 952 ev_timer_stop (w);
709 } 953 }
710 else if (w->repeat) 954 else if (w->repeat)
711 evtimer_start (w); 955 ev_timer_start (w);
712} 956}
713 957
714void 958void
715evperiodic_start (struct ev_periodic *w) 959ev_periodic_start (struct ev_periodic *w)
716{ 960{
717 if (ev_is_active (w)) 961 if (ev_is_active (w))
718 return; 962 return;
719 963
720 assert (("periodic interval value less than zero not allowed", w->interval >= 0.)); 964 assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
721 965
722 /* this formula differs from the one in periodic_reify because we do not always round up */ 966 /* this formula differs from the one in periodic_reify because we do not always round up */
723 if (w->interval) 967 if (w->interval)
724 w->at += ceil ((ev_now - w->at) / w->interval) * w->interval; 968 w->at += ceil ((ev_now - w->at) / w->interval) * w->interval;
725 969
… …
728 periodics [periodiccnt - 1] = w; 972 periodics [periodiccnt - 1] = w;
729 upheap ((WT *)periodics, periodiccnt - 1); 973 upheap ((WT *)periodics, periodiccnt - 1);
730} 974}
731 975
732void 976void
733evperiodic_stop (struct ev_periodic *w) 977ev_periodic_stop (struct ev_periodic *w)
734{ 978{
735 ev_clear ((W)w); 979 ev_clear_pending ((W)w);
736 if (!ev_is_active (w)) 980 if (!ev_is_active (w))
737 return; 981 return;
738 982
739 if (w->active < periodiccnt--) 983 if (w->active < periodiccnt--)
740 { 984 {
… …
744 988
745 ev_stop ((W)w); 989 ev_stop ((W)w);
746} 990}
747 991
748void 992void
749evsignal_start (struct ev_signal *w) 993ev_signal_start (struct ev_signal *w)
750{ 994{
751 if (ev_is_active (w)) 995 if (ev_is_active (w))
752 return; 996 return;
997
998 assert (("ev_signal_start called with illegal signal number", w->signum > 0));
753 999
754 ev_start ((W)w, 1); 1000 ev_start ((W)w, 1);
755 array_needsize (signals, signalmax, w->signum, signals_init); 1001 array_needsize (signals, signalmax, w->signum, signals_init);
756 wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w); 1002 wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
757 1003
… …
764 sigaction (w->signum, &sa, 0); 1010 sigaction (w->signum, &sa, 0);
765 } 1011 }
766} 1012}
767 1013
768void 1014void
769evsignal_stop (struct ev_signal *w) 1015ev_signal_stop (struct ev_signal *w)
770{ 1016{
771 ev_clear ((W)w); 1017 ev_clear_pending ((W)w);
772 if (!ev_is_active (w)) 1018 if (!ev_is_active (w))
773 return; 1019 return;
774 1020
775 wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w); 1021 wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
776 ev_stop ((W)w); 1022 ev_stop ((W)w);
777 1023
778 if (!signals [w->signum - 1].head) 1024 if (!signals [w->signum - 1].head)
779 signal (w->signum, SIG_DFL); 1025 signal (w->signum, SIG_DFL);
780} 1026}
781 1027
1028void
782void evidle_start (struct ev_idle *w) 1029ev_idle_start (struct ev_idle *w)
783{ 1030{
784 if (ev_is_active (w)) 1031 if (ev_is_active (w))
785 return; 1032 return;
786 1033
787 ev_start ((W)w, ++idlecnt); 1034 ev_start ((W)w, ++idlecnt);
788 array_needsize (idles, idlemax, idlecnt, ); 1035 array_needsize (idles, idlemax, idlecnt, );
789 idles [idlecnt - 1] = w; 1036 idles [idlecnt - 1] = w;
790} 1037}
791 1038
1039void
792void evidle_stop (struct ev_idle *w) 1040ev_idle_stop (struct ev_idle *w)
793{ 1041{
794 ev_clear ((W)w); 1042 ev_clear_pending ((W)w);
795 if (ev_is_active (w)) 1043 if (ev_is_active (w))
796 return; 1044 return;
797 1045
798 idles [w->active - 1] = idles [--idlecnt]; 1046 idles [w->active - 1] = idles [--idlecnt];
799 ev_stop ((W)w); 1047 ev_stop ((W)w);
800} 1048}
801 1049
1050void
1051ev_prepare_start (struct ev_prepare *w)
1052{
1053 if (ev_is_active (w))
1054 return;
1055
1056 ev_start ((W)w, ++preparecnt);
1057 array_needsize (prepares, preparemax, preparecnt, );
1058 prepares [preparecnt - 1] = w;
1059}
1060
1061void
1062ev_prepare_stop (struct ev_prepare *w)
1063{
1064 ev_clear_pending ((W)w);
1065 if (ev_is_active (w))
1066 return;
1067
1068 prepares [w->active - 1] = prepares [--preparecnt];
1069 ev_stop ((W)w);
1070}
1071
1072void
802void evcheck_start (struct ev_check *w) 1073ev_check_start (struct ev_check *w)
803{ 1074{
804 if (ev_is_active (w)) 1075 if (ev_is_active (w))
805 return; 1076 return;
806 1077
807 ev_start ((W)w, ++checkcnt); 1078 ev_start ((W)w, ++checkcnt);
808 array_needsize (checks, checkmax, checkcnt, ); 1079 array_needsize (checks, checkmax, checkcnt, );
809 checks [checkcnt - 1] = w; 1080 checks [checkcnt - 1] = w;
810} 1081}
811 1082
1083void
812void evcheck_stop (struct ev_check *w) 1084ev_check_stop (struct ev_check *w)
813{ 1085{
814 ev_clear ((W)w); 1086 ev_clear_pending ((W)w);
815 if (ev_is_active (w)) 1087 if (ev_is_active (w))
816 return; 1088 return;
817 1089
818 checks [w->active - 1] = checks [--checkcnt]; 1090 checks [w->active - 1] = checks [--checkcnt];
1091 ev_stop ((W)w);
1092}
1093
1094void
1095ev_child_start (struct ev_child *w)
1096{
1097 if (ev_is_active (w))
1098 return;
1099
1100 ev_start ((W)w, 1);
1101 wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
1102}
1103
1104void
1105ev_child_stop (struct ev_child *w)
1106{
1107 ev_clear_pending ((W)w);
1108 if (ev_is_active (w))
1109 return;
1110
1111 wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
819 ev_stop ((W)w); 1112 ev_stop ((W)w);
820} 1113}
821 1114
822/*****************************************************************************/ 1115/*****************************************************************************/
823 1116
… …
833once_cb (struct ev_once *once, int revents) 1126once_cb (struct ev_once *once, int revents)
834{ 1127{
835 void (*cb)(int revents, void *arg) = once->cb; 1128 void (*cb)(int revents, void *arg) = once->cb;
836 void *arg = once->arg; 1129 void *arg = once->arg;
837 1130
838 evio_stop (&once->io); 1131 ev_io_stop (&once->io);
839 evtimer_stop (&once->to); 1132 ev_timer_stop (&once->to);
840 free (once); 1133 free (once);
841 1134
842 cb (revents, arg); 1135 cb (revents, arg);
843} 1136}
844 1137
… …
858ev_once (int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg) 1151ev_once (int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
859{ 1152{
860 struct ev_once *once = malloc (sizeof (struct ev_once)); 1153 struct ev_once *once = malloc (sizeof (struct ev_once));
861 1154
862 if (!once) 1155 if (!once)
863 cb (EV_ERROR, arg); 1156 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
864 else 1157 else
865 { 1158 {
866 once->cb = cb; 1159 once->cb = cb;
867 once->arg = arg; 1160 once->arg = arg;
868 1161
869 evw_init (&once->io, once_cb_io); 1162 ev_watcher_init (&once->io, once_cb_io);
870
871 if (fd >= 0) 1163 if (fd >= 0)
872 { 1164 {
873 evio_set (&once->io, fd, events); 1165 ev_io_set (&once->io, fd, events);
874 evio_start (&once->io); 1166 ev_io_start (&once->io);
875 } 1167 }
876 1168
877 evw_init (&once->to, once_cb_to); 1169 ev_watcher_init (&once->to, once_cb_to);
878
879 if (timeout >= 0.) 1170 if (timeout >= 0.)
880 { 1171 {
881 evtimer_set (&once->to, timeout, 0.); 1172 ev_timer_set (&once->to, timeout, 0.);
882 evtimer_start (&once->to); 1173 ev_timer_start (&once->to);
883 } 1174 }
884 } 1175 }
885} 1176}
886 1177
887/*****************************************************************************/ 1178/*****************************************************************************/
… …
898 1189
899static void 1190static void
900ocb (struct ev_timer *w, int revents) 1191ocb (struct ev_timer *w, int revents)
901{ 1192{
902 //fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data); 1193 //fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
903 evtimer_stop (w); 1194 ev_timer_stop (w);
904 evtimer_start (w); 1195 ev_timer_start (w);
905} 1196}
906 1197
907static void 1198static void
908scb (struct ev_signal *w, int revents) 1199scb (struct ev_signal *w, int revents)
909{ 1200{
910 fprintf (stderr, "signal %x,%d\n", revents, w->signum); 1201 fprintf (stderr, "signal %x,%d\n", revents, w->signum);
911 evio_stop (&wio); 1202 ev_io_stop (&wio);
912 evio_start (&wio); 1203 ev_io_start (&wio);
913} 1204}
914 1205
915static void 1206static void
916gcb (struct ev_signal *w, int revents) 1207gcb (struct ev_signal *w, int revents)
917{ 1208{
… …
921 1212
922int main (void) 1213int main (void)
923{ 1214{
924 ev_init (0); 1215 ev_init (0);
925 1216
926 evio_init (&wio, sin_cb, 0, EV_READ); 1217 ev_io_init (&wio, sin_cb, 0, EV_READ);
927 evio_start (&wio); 1218 ev_io_start (&wio);
928 1219
929 struct ev_timer t[10000]; 1220 struct ev_timer t[10000];
930 1221
931#if 0 1222#if 0
932 int i; 1223 int i;
933 for (i = 0; i < 10000; ++i) 1224 for (i = 0; i < 10000; ++i)
934 { 1225 {
935 struct ev_timer *w = t + i; 1226 struct ev_timer *w = t + i;
936 evw_init (w, ocb, i); 1227 ev_watcher_init (w, ocb, i);
937 evtimer_init_abs (w, ocb, drand48 (), 0.99775533); 1228 ev_timer_init_abs (w, ocb, drand48 (), 0.99775533);
938 evtimer_start (w); 1229 ev_timer_start (w);
939 if (drand48 () < 0.5) 1230 if (drand48 () < 0.5)
940 evtimer_stop (w); 1231 ev_timer_stop (w);
941 } 1232 }
942#endif 1233#endif
943 1234
944 struct ev_timer t1; 1235 struct ev_timer t1;
945 evtimer_init (&t1, ocb, 5, 10); 1236 ev_timer_init (&t1, ocb, 5, 10);
946 evtimer_start (&t1); 1237 ev_timer_start (&t1);
947 1238
948 struct ev_signal sig; 1239 struct ev_signal sig;
949 evsignal_init (&sig, scb, SIGQUIT); 1240 ev_signal_init (&sig, scb, SIGQUIT);
950 evsignal_start (&sig); 1241 ev_signal_start (&sig);
951 1242
952 struct ev_check cw; 1243 struct ev_check cw;
953 evcheck_init (&cw, gcb); 1244 ev_check_init (&cw, gcb);
954 evcheck_start (&cw); 1245 ev_check_start (&cw);
955 1246
956 struct ev_idle iw; 1247 struct ev_idle iw;
957 evidle_init (&iw, gcb); 1248 ev_idle_init (&iw, gcb);
958 evidle_start (&iw); 1249 ev_idle_start (&iw);
959 1250
960 ev_loop (0); 1251 ev_loop (0);
961 1252
962 return 0; 1253 return 0;
963} 1254}

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