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Comparing libev/ev.c (file contents):
Revision 1.4 by root, Tue Oct 30 23:10:33 2007 UTC vs.
Revision 1.287 by root, Mon Apr 20 19:45:58 2009 UTC

1/*
2 * libev event processing core, watcher management
3 *
4 * Copyright (c) 2007,2008,2009 Marc Alexander Lehmann <libev@schmorp.de>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without modifica-
8 * tion, are permitted provided that the following conditions are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright notice,
11 * this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
19 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
20 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
21 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
23 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
25 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
26 * OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * Alternatively, the contents of this file may be used under the terms of
29 * the GNU General Public License ("GPL") version 2 or any later version,
30 * in which case the provisions of the GPL are applicable instead of
31 * the above. If you wish to allow the use of your version of this file
32 * only under the terms of the GPL and not to allow others to use your
33 * version of this file under the BSD license, indicate your decision
34 * by deleting the provisions above and replace them with the notice
35 * and other provisions required by the GPL. If you do not delete the
36 * provisions above, a recipient may use your version of this file under
37 * either the BSD or the GPL.
38 */
39
40#ifdef __cplusplus
41extern "C" {
42#endif
43
44/* this big block deduces configuration from config.h */
45#ifndef EV_STANDALONE
46# ifdef EV_CONFIG_H
47# include EV_CONFIG_H
48# else
49# include "config.h"
50# endif
51
52# if HAVE_CLOCK_SYSCALL
53# ifndef EV_USE_CLOCK_SYSCALL
54# define EV_USE_CLOCK_SYSCALL 1
55# ifndef EV_USE_REALTIME
56# define EV_USE_REALTIME 0
57# endif
58# ifndef EV_USE_MONOTONIC
59# define EV_USE_MONOTONIC 1
60# endif
61# endif
62# endif
63
64# if HAVE_CLOCK_GETTIME
65# ifndef EV_USE_MONOTONIC
66# define EV_USE_MONOTONIC 1
67# endif
68# ifndef EV_USE_REALTIME
69# define EV_USE_REALTIME 0
70# endif
71# else
72# ifndef EV_USE_MONOTONIC
73# define EV_USE_MONOTONIC 0
74# endif
75# ifndef EV_USE_REALTIME
76# define EV_USE_REALTIME 0
77# endif
78# endif
79
80# ifndef EV_USE_NANOSLEEP
81# if HAVE_NANOSLEEP
82# define EV_USE_NANOSLEEP 1
83# else
84# define EV_USE_NANOSLEEP 0
85# endif
86# endif
87
88# ifndef EV_USE_SELECT
89# if HAVE_SELECT && HAVE_SYS_SELECT_H
90# define EV_USE_SELECT 1
91# else
92# define EV_USE_SELECT 0
93# endif
94# endif
95
96# ifndef EV_USE_POLL
97# if HAVE_POLL && HAVE_POLL_H
98# define EV_USE_POLL 1
99# else
100# define EV_USE_POLL 0
101# endif
102# endif
103
104# ifndef EV_USE_EPOLL
105# if HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
106# define EV_USE_EPOLL 1
107# else
108# define EV_USE_EPOLL 0
109# endif
110# endif
111
112# ifndef EV_USE_KQUEUE
113# if HAVE_KQUEUE && HAVE_SYS_EVENT_H && HAVE_SYS_QUEUE_H
114# define EV_USE_KQUEUE 1
115# else
116# define EV_USE_KQUEUE 0
117# endif
118# endif
119
120# ifndef EV_USE_PORT
121# if HAVE_PORT_H && HAVE_PORT_CREATE
122# define EV_USE_PORT 1
123# else
124# define EV_USE_PORT 0
125# endif
126# endif
127
128# ifndef EV_USE_INOTIFY
129# if HAVE_INOTIFY_INIT && HAVE_SYS_INOTIFY_H
130# define EV_USE_INOTIFY 1
131# else
132# define EV_USE_INOTIFY 0
133# endif
134# endif
135
136# ifndef EV_USE_EVENTFD
137# if HAVE_EVENTFD
138# define EV_USE_EVENTFD 1
139# else
140# define EV_USE_EVENTFD 0
141# endif
142# endif
143
144#endif
145
1#include <math.h> 146#include <math.h>
2#include <stdlib.h> 147#include <stdlib.h>
148#include <fcntl.h>
149#include <stddef.h>
3 150
4#include <stdio.h> 151#include <stdio.h>
5 152
6#include <assert.h> 153#include <assert.h>
7#include <errno.h> 154#include <errno.h>
8#include <sys/time.h> 155#include <sys/types.h>
9#include <time.h> 156#include <time.h>
10 157
158#include <signal.h>
159
160#ifdef EV_H
161# include EV_H
162#else
163# include "ev.h"
164#endif
165
166#ifndef _WIN32
167# include <sys/time.h>
168# include <sys/wait.h>
169# include <unistd.h>
170#else
171# include <io.h>
172# define WIN32_LEAN_AND_MEAN
173# include <windows.h>
174# ifndef EV_SELECT_IS_WINSOCKET
175# define EV_SELECT_IS_WINSOCKET 1
176# endif
177#endif
178
179/* this block tries to deduce configuration from header-defined symbols and defaults */
180
181#ifndef EV_USE_CLOCK_SYSCALL
182# if __linux && __GLIBC__ >= 2
183# define EV_USE_CLOCK_SYSCALL 1
184# else
185# define EV_USE_CLOCK_SYSCALL 0
186# endif
187#endif
188
189#ifndef EV_USE_MONOTONIC
190# if defined (_POSIX_MONOTONIC_CLOCK) && _POSIX_MONOTONIC_CLOCK >= 0
191# define EV_USE_MONOTONIC 1
192# else
193# define EV_USE_MONOTONIC 0
194# endif
195#endif
196
197#ifndef EV_USE_REALTIME
198# define EV_USE_REALTIME !EV_USE_CLOCK_SYSCALL
199#endif
200
201#ifndef EV_USE_NANOSLEEP
202# if _POSIX_C_SOURCE >= 199309L
203# define EV_USE_NANOSLEEP 1
204# else
205# define EV_USE_NANOSLEEP 0
206# endif
207#endif
208
209#ifndef EV_USE_SELECT
210# define EV_USE_SELECT 1
211#endif
212
213#ifndef EV_USE_POLL
214# ifdef _WIN32
215# define EV_USE_POLL 0
216# else
217# define EV_USE_POLL 1
218# endif
219#endif
220
221#ifndef EV_USE_EPOLL
222# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
223# define EV_USE_EPOLL 1
224# else
225# define EV_USE_EPOLL 0
226# endif
227#endif
228
229#ifndef EV_USE_KQUEUE
230# define EV_USE_KQUEUE 0
231#endif
232
233#ifndef EV_USE_PORT
234# define EV_USE_PORT 0
235#endif
236
237#ifndef EV_USE_INOTIFY
238# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
239# define EV_USE_INOTIFY 1
240# else
241# define EV_USE_INOTIFY 0
242# endif
243#endif
244
245#ifndef EV_PID_HASHSIZE
246# if EV_MINIMAL
247# define EV_PID_HASHSIZE 1
248# else
249# define EV_PID_HASHSIZE 16
250# endif
251#endif
252
253#ifndef EV_INOTIFY_HASHSIZE
254# if EV_MINIMAL
255# define EV_INOTIFY_HASHSIZE 1
256# else
257# define EV_INOTIFY_HASHSIZE 16
258# endif
259#endif
260
261#ifndef EV_USE_EVENTFD
262# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
263# define EV_USE_EVENTFD 1
264# else
265# define EV_USE_EVENTFD 0
266# endif
267#endif
268
269#if 0 /* debugging */
270# define EV_VERIFY 3
271# define EV_USE_4HEAP 1
272# define EV_HEAP_CACHE_AT 1
273#endif
274
275#ifndef EV_VERIFY
276# define EV_VERIFY !EV_MINIMAL
277#endif
278
279#ifndef EV_USE_4HEAP
280# define EV_USE_4HEAP !EV_MINIMAL
281#endif
282
283#ifndef EV_HEAP_CACHE_AT
284# define EV_HEAP_CACHE_AT !EV_MINIMAL
285#endif
286
287/* this block fixes any misconfiguration where we know we run into trouble otherwise */
288
11#ifdef CLOCK_MONOTONIC 289#ifndef CLOCK_MONOTONIC
290# undef EV_USE_MONOTONIC
12# define HAVE_MONOTONIC 1 291# define EV_USE_MONOTONIC 0
292#endif
293
294#ifndef CLOCK_REALTIME
295# undef EV_USE_REALTIME
296# define EV_USE_REALTIME 0
297#endif
298
299#if !EV_STAT_ENABLE
300# undef EV_USE_INOTIFY
301# define EV_USE_INOTIFY 0
302#endif
303
304#if !EV_USE_NANOSLEEP
305# ifndef _WIN32
306# include <sys/select.h>
13#endif 307# endif
308#endif
14 309
15#define HAVE_EPOLL 1 310#if EV_USE_INOTIFY
16#define HAVE_REALTIME 1 311# include <sys/utsname.h>
17#define HAVE_SELECT 0 312# include <sys/statfs.h>
313# include <sys/inotify.h>
314/* some very old inotify.h headers don't have IN_DONT_FOLLOW */
315# ifndef IN_DONT_FOLLOW
316# undef EV_USE_INOTIFY
317# define EV_USE_INOTIFY 0
318# endif
319#endif
320
321#if EV_SELECT_IS_WINSOCKET
322# include <winsock.h>
323#endif
324
325/* on linux, we can use a (slow) syscall to avoid a dependency on pthread, */
326/* which makes programs even slower. might work on other unices, too. */
327#if EV_USE_CLOCK_SYSCALL
328# include <syscall.h>
329# define clock_gettime(id, ts) syscall (SYS_clock_gettime, (id), (ts))
330# undef EV_USE_MONOTONIC
331# define EV_USE_MONOTONIC 1
332#endif
333
334#if EV_USE_EVENTFD
335/* our minimum requirement is glibc 2.7 which has the stub, but not the header */
336# include <stdint.h>
337# ifdef __cplusplus
338extern "C" {
339# endif
340int eventfd (unsigned int initval, int flags);
341# ifdef __cplusplus
342}
343# endif
344#endif
345
346/**/
347
348#if EV_VERIFY >= 3
349# define EV_FREQUENT_CHECK ev_loop_verify (EV_A)
350#else
351# define EV_FREQUENT_CHECK do { } while (0)
352#endif
353
354/*
355 * This is used to avoid floating point rounding problems.
356 * It is added to ev_rt_now when scheduling periodics
357 * to ensure progress, time-wise, even when rounding
358 * errors are against us.
359 * This value is good at least till the year 4000.
360 * Better solutions welcome.
361 */
362#define TIME_EPSILON 0.0001220703125 /* 1/8192 */
18 363
19#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */ 364#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
20#define MAX_BLOCKTIME 60. 365#define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
366/*#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds, TODO */
21 367
368#if __GNUC__ >= 4
369# define expect(expr,value) __builtin_expect ((expr),(value))
370# define noinline __attribute__ ((noinline))
371#else
372# define expect(expr,value) (expr)
373# define noinline
374# if __STDC_VERSION__ < 199901L && __GNUC__ < 2
375# define inline
376# endif
377#endif
378
379#define expect_false(expr) expect ((expr) != 0, 0)
380#define expect_true(expr) expect ((expr) != 0, 1)
381#define inline_size static inline
382
383#if EV_MINIMAL
384# define inline_speed static noinline
385#else
386# define inline_speed static inline
387#endif
388
389#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
390#define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
391
392#define EMPTY /* required for microsofts broken pseudo-c compiler */
393#define EMPTY2(a,b) /* used to suppress some warnings */
394
395typedef ev_watcher *W;
396typedef ev_watcher_list *WL;
397typedef ev_watcher_time *WT;
398
399#define ev_active(w) ((W)(w))->active
400#define ev_at(w) ((WT)(w))->at
401
402#if EV_USE_REALTIME
403/* sig_atomic_t is used to avoid per-thread variables or locking but still */
404/* giving it a reasonably high chance of working on typical architetcures */
405static EV_ATOMIC_T have_realtime; /* did clock_gettime (CLOCK_REALTIME) work? */
406#endif
407
408#if EV_USE_MONOTONIC
409static EV_ATOMIC_T have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
410#endif
411
412#ifdef _WIN32
413# include "ev_win32.c"
414#endif
415
416/*****************************************************************************/
417
418static void (*syserr_cb)(const char *msg);
419
420void
421ev_set_syserr_cb (void (*cb)(const char *msg))
422{
423 syserr_cb = cb;
424}
425
426static void noinline
427ev_syserr (const char *msg)
428{
429 if (!msg)
430 msg = "(libev) system error";
431
432 if (syserr_cb)
433 syserr_cb (msg);
434 else
435 {
436 perror (msg);
437 abort ();
438 }
439}
440
441static void *
442ev_realloc_emul (void *ptr, long size)
443{
444 /* some systems, notably openbsd and darwin, fail to properly
445 * implement realloc (x, 0) (as required by both ansi c-98 and
446 * the single unix specification, so work around them here.
447 */
448
449 if (size)
450 return realloc (ptr, size);
451
452 free (ptr);
453 return 0;
454}
455
456static void *(*alloc)(void *ptr, long size) = ev_realloc_emul;
457
458void
459ev_set_allocator (void *(*cb)(void *ptr, long size))
460{
461 alloc = cb;
462}
463
464inline_speed void *
465ev_realloc (void *ptr, long size)
466{
467 ptr = alloc (ptr, size);
468
469 if (!ptr && size)
470 {
471 fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
472 abort ();
473 }
474
475 return ptr;
476}
477
478#define ev_malloc(size) ev_realloc (0, (size))
479#define ev_free(ptr) ev_realloc ((ptr), 0)
480
481/*****************************************************************************/
482
483typedef struct
484{
485 WL head;
486 unsigned char events;
487 unsigned char reify;
488 unsigned char emask; /* the epoll backend stores the actual kernel mask in here */
489 unsigned char unused;
490#if EV_USE_EPOLL
491 unsigned int egen; /* generation counter to counter epoll bugs */
492#endif
493#if EV_SELECT_IS_WINSOCKET
494 SOCKET handle;
495#endif
496} ANFD;
497
498typedef struct
499{
500 W w;
501 int events;
502} ANPENDING;
503
504#if EV_USE_INOTIFY
505/* hash table entry per inotify-id */
506typedef struct
507{
508 WL head;
509} ANFS;
510#endif
511
512/* Heap Entry */
513#if EV_HEAP_CACHE_AT
514 typedef struct {
515 ev_tstamp at;
516 WT w;
517 } ANHE;
518
519 #define ANHE_w(he) (he).w /* access watcher, read-write */
520 #define ANHE_at(he) (he).at /* access cached at, read-only */
521 #define ANHE_at_cache(he) (he).at = (he).w->at /* update at from watcher */
522#else
523 typedef WT ANHE;
524
525 #define ANHE_w(he) (he)
526 #define ANHE_at(he) (he)->at
527 #define ANHE_at_cache(he)
528#endif
529
530#if EV_MULTIPLICITY
531
532 struct ev_loop
533 {
534 ev_tstamp ev_rt_now;
535 #define ev_rt_now ((loop)->ev_rt_now)
536 #define VAR(name,decl) decl;
537 #include "ev_vars.h"
538 #undef VAR
539 };
22#include "ev.h" 540 #include "ev_wrap.h"
23 541
24struct ev_watcher { 542 static struct ev_loop default_loop_struct;
25 EV_WATCHER (ev_watcher); 543 struct ev_loop *ev_default_loop_ptr;
26};
27 544
28struct ev_watcher_list { 545#else
29 EV_WATCHER_LIST (ev_watcher_list);
30};
31 546
32static ev_tstamp now, diff; /* monotonic clock */
33ev_tstamp ev_now; 547 ev_tstamp ev_rt_now;
34int ev_method; 548 #define VAR(name,decl) static decl;
549 #include "ev_vars.h"
550 #undef VAR
35 551
36static int have_monotonic; /* runtime */ 552 static int ev_default_loop_ptr;
37 553
38static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */ 554#endif
39static void (*method_reify)(void); 555
40static void (*method_poll)(ev_tstamp timeout); 556/*****************************************************************************/
41 557
42ev_tstamp 558ev_tstamp
43ev_time (void) 559ev_time (void)
44{ 560{
45#if HAVE_REALTIME 561#if EV_USE_REALTIME
562 if (expect_true (have_realtime))
563 {
46 struct timespec ts; 564 struct timespec ts;
47 clock_gettime (CLOCK_REALTIME, &ts); 565 clock_gettime (CLOCK_REALTIME, &ts);
48 return ts.tv_sec + ts.tv_nsec * 1e-9; 566 return ts.tv_sec + ts.tv_nsec * 1e-9;
49#else 567 }
568#endif
569
50 struct timeval tv; 570 struct timeval tv;
51 gettimeofday (&tv, 0); 571 gettimeofday (&tv, 0);
52 return tv.tv_sec + tv.tv_usec * 1e-6; 572 return tv.tv_sec + tv.tv_usec * 1e-6;
53#endif
54} 573}
55 574
56static ev_tstamp 575inline_size ev_tstamp
57get_clock (void) 576get_clock (void)
58{ 577{
59#if HAVE_MONOTONIC 578#if EV_USE_MONOTONIC
60 if (have_monotonic) 579 if (expect_true (have_monotonic))
61 { 580 {
62 struct timespec ts; 581 struct timespec ts;
63 clock_gettime (CLOCK_MONOTONIC, &ts); 582 clock_gettime (CLOCK_MONOTONIC, &ts);
64 return ts.tv_sec + ts.tv_nsec * 1e-9; 583 return ts.tv_sec + ts.tv_nsec * 1e-9;
65 } 584 }
66#endif 585#endif
67 586
68 return ev_time (); 587 return ev_time ();
69} 588}
70 589
590#if EV_MULTIPLICITY
591ev_tstamp
592ev_now (EV_P)
593{
594 return ev_rt_now;
595}
596#endif
597
598void
599ev_sleep (ev_tstamp delay)
600{
601 if (delay > 0.)
602 {
603#if EV_USE_NANOSLEEP
604 struct timespec ts;
605
606 ts.tv_sec = (time_t)delay;
607 ts.tv_nsec = (long)((delay - (ev_tstamp)(ts.tv_sec)) * 1e9);
608
609 nanosleep (&ts, 0);
610#elif defined(_WIN32)
611 Sleep ((unsigned long)(delay * 1e3));
612#else
613 struct timeval tv;
614
615 tv.tv_sec = (time_t)delay;
616 tv.tv_usec = (long)((delay - (ev_tstamp)(tv.tv_sec)) * 1e6);
617
618 /* here we rely on sys/time.h + sys/types.h + unistd.h providing select */
619 /* somehting nto guaranteed by newer posix versions, but guaranteed */
620 /* by older ones */
621 select (0, 0, 0, 0, &tv);
622#endif
623 }
624}
625
626/*****************************************************************************/
627
628#define MALLOC_ROUND 4096 /* prefer to allocate in chunks of this size, must be 2**n and >> 4 longs */
629
630inline_size int
631array_nextsize (int elem, int cur, int cnt)
632{
633 int ncur = cur + 1;
634
635 do
636 ncur <<= 1;
637 while (cnt > ncur);
638
639 /* if size is large, round to MALLOC_ROUND - 4 * longs to accomodate malloc overhead */
640 if (elem * ncur > MALLOC_ROUND - sizeof (void *) * 4)
641 {
642 ncur *= elem;
643 ncur = (ncur + elem + (MALLOC_ROUND - 1) + sizeof (void *) * 4) & ~(MALLOC_ROUND - 1);
644 ncur = ncur - sizeof (void *) * 4;
645 ncur /= elem;
646 }
647
648 return ncur;
649}
650
651static noinline void *
652array_realloc (int elem, void *base, int *cur, int cnt)
653{
654 *cur = array_nextsize (elem, *cur, cnt);
655 return ev_realloc (base, elem * *cur);
656}
657
658#define array_init_zero(base,count) \
659 memset ((void *)(base), 0, sizeof (*(base)) * (count))
660
71#define array_needsize(base,cur,cnt,init) \ 661#define array_needsize(type,base,cur,cnt,init) \
72 if ((cnt) > cur) \ 662 if (expect_false ((cnt) > (cur))) \
73 { \ 663 { \
74 int newcnt = cur ? cur << 1 : 16; \ 664 int ocur_ = (cur); \
75 fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\ 665 (base) = (type *)array_realloc \
76 base = realloc (base, sizeof (*base) * (newcnt)); \ 666 (sizeof (type), (base), &(cur), (cnt)); \
77 init (base + cur, newcnt - cur); \ 667 init ((base) + (ocur_), (cur) - ocur_); \
78 cur = newcnt; \
79 }
80
81typedef struct
82{
83 struct ev_io *head;
84 unsigned char wev, rev; /* want, received event set */
85} ANFD;
86
87static ANFD *anfds;
88static int anfdmax;
89
90static int *fdchanges;
91static int fdchangemax, fdchangecnt;
92
93static void
94anfds_init (ANFD *base, int count)
95{
96 while (count--)
97 { 668 }
98 base->head = 0;
99 base->wev = base->rev = EV_NONE;
100 ++base;
101 }
102}
103 669
104typedef struct 670#if 0
105{ 671#define array_slim(type,stem) \
106 struct ev_watcher *w; 672 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
107 int events; 673 { \
108} ANPENDING; 674 stem ## max = array_roundsize (stem ## cnt >> 1); \
675 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
676 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
677 }
678#endif
109 679
110static ANPENDING *pendings; 680#define array_free(stem, idx) \
111static int pendingmax, pendingcnt; 681 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0; stem ## s idx = 0
112 682
113static void 683/*****************************************************************************/
114event (struct ev_watcher *w, int events) 684
685void noinline
686ev_feed_event (EV_P_ void *w, int revents)
115{ 687{
116 w->pending = ++pendingcnt; 688 W w_ = (W)w;
117 array_needsize (pendings, pendingmax, pendingcnt, ); 689 int pri = ABSPRI (w_);
118 pendings [pendingcnt - 1].w = w; 690
691 if (expect_false (w_->pending))
119 pendings [pendingcnt - 1].events = events; 692 pendings [pri][w_->pending - 1].events |= revents;
693 else
694 {
695 w_->pending = ++pendingcnt [pri];
696 array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
697 pendings [pri][w_->pending - 1].w = w_;
698 pendings [pri][w_->pending - 1].events = revents;
699 }
120} 700}
121 701
122static void 702inline_speed void
703feed_reverse (EV_P_ W w)
704{
705 array_needsize (W, rfeeds, rfeedmax, rfeedcnt + 1, EMPTY2);
706 rfeeds [rfeedcnt++] = w;
707}
708
709inline_size void
710feed_reverse_done (EV_P_ int revents)
711{
712 do
713 ev_feed_event (EV_A_ rfeeds [--rfeedcnt], revents);
714 while (rfeedcnt);
715}
716
717inline_speed void
718queue_events (EV_P_ W *events, int eventcnt, int type)
719{
720 int i;
721
722 for (i = 0; i < eventcnt; ++i)
723 ev_feed_event (EV_A_ events [i], type);
724}
725
726/*****************************************************************************/
727
728inline_speed void
123fd_event (int fd, int events) 729fd_event (EV_P_ int fd, int revents)
124{ 730{
125 ANFD *anfd = anfds + fd; 731 ANFD *anfd = anfds + fd;
126 struct ev_io *w; 732 ev_io *w;
127 733
128 for (w = anfd->head; w; w = w->next) 734 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
129 { 735 {
130 int ev = w->events & events; 736 int ev = w->events & revents;
131 737
132 if (ev) 738 if (ev)
133 event ((struct ev_watcher *)w, ev); 739 ev_feed_event (EV_A_ (W)w, ev);
134 }
135}
136
137static struct ev_timer **atimers;
138static int atimermax, atimercnt;
139
140static struct ev_timer **rtimers;
141static int rtimermax, rtimercnt;
142
143static void
144upheap (struct ev_timer **timers, int k)
145{
146 struct ev_timer *w = timers [k];
147
148 while (k && timers [k >> 1]->at > w->at)
149 { 740 }
150 timers [k] = timers [k >> 1];
151 timers [k]->active = k + 1;
152 k >>= 1;
153 }
154
155 timers [k] = w;
156 timers [k]->active = k + 1;
157
158} 741}
159 742
160static void 743void
161downheap (struct ev_timer **timers, int N, int k) 744ev_feed_fd_event (EV_P_ int fd, int revents)
162{ 745{
163 struct ev_timer *w = timers [k]; 746 if (fd >= 0 && fd < anfdmax)
164 747 fd_event (EV_A_ fd, revents);
165 while (k < (N >> 1))
166 {
167 int j = k << 1;
168
169 if (j + 1 < N && timers [j]->at > timers [j + 1]->at)
170 ++j;
171
172 if (w->at <= timers [j]->at)
173 break;
174
175 timers [k] = timers [j];
176 timers [k]->active = k + 1;
177 k = j;
178 }
179
180 timers [k] = w;
181 timers [k]->active = k + 1;
182} 748}
183 749
184static struct ev_signal **signals; 750inline_size void
185static int signalmax; 751fd_reify (EV_P)
186
187static void
188signals_init (struct ev_signal **base, int count)
189{
190 while (count--)
191 *base++ = 0;
192}
193
194#if HAVE_EPOLL
195# include "ev_epoll.c"
196#endif
197#if HAVE_SELECT
198# include "ev_select.c"
199#endif
200
201int ev_init (int flags)
202{
203#if HAVE_MONOTONIC
204 {
205 struct timespec ts;
206 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
207 have_monotonic = 1;
208 }
209#endif
210
211 ev_now = ev_time ();
212 now = get_clock ();
213 diff = ev_now - now;
214
215#if HAVE_EPOLL
216 if (epoll_init (flags))
217 return ev_method;
218#endif
219#if HAVE_SELECT
220 if (select_init (flags))
221 return ev_method;
222#endif
223
224 ev_method = EVMETHOD_NONE;
225 return ev_method;
226}
227
228void ev_prefork (void)
229{
230}
231
232void ev_postfork_parent (void)
233{
234}
235
236void ev_postfork_child (void)
237{
238#if HAVE_EPOLL
239 epoll_postfork_child ();
240#endif
241}
242
243static void
244call_pending ()
245{ 752{
246 int i; 753 int i;
247 754
248 for (i = 0; i < pendingcnt; ++i) 755 for (i = 0; i < fdchangecnt; ++i)
249 { 756 {
250 ANPENDING *p = pendings + i; 757 int fd = fdchanges [i];
758 ANFD *anfd = anfds + fd;
759 ev_io *w;
251 760
252 if (p->w) 761 unsigned char events = 0;
762
763 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
764 events |= (unsigned char)w->events;
765
766#if EV_SELECT_IS_WINSOCKET
767 if (events)
253 { 768 {
254 p->w->pending = 0; 769 unsigned long arg;
255 p->w->cb (p->w, p->events); 770 #ifdef EV_FD_TO_WIN32_HANDLE
771 anfd->handle = EV_FD_TO_WIN32_HANDLE (fd);
772 #else
773 anfd->handle = _get_osfhandle (fd);
774 #endif
775 assert (("libev: only socket fds supported in this configuration", ioctlsocket (anfd->handle, FIONREAD, &arg) == 0));
256 } 776 }
257 } 777#endif
258 778
259 pendingcnt = 0;
260}
261
262static void
263timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)
264{
265 while (timercnt && timers [0]->at <= now)
266 { 779 {
267 struct ev_timer *w = timers [0]; 780 unsigned char o_events = anfd->events;
781 unsigned char o_reify = anfd->reify;
268 782
269 /* first reschedule or stop timer */ 783 anfd->reify = 0;
270 if (w->repeat) 784 anfd->events = events;
785
786 if (o_events != events || o_reify & EV__IOFDSET)
787 backend_modify (EV_A_ fd, o_events, events);
788 }
789 }
790
791 fdchangecnt = 0;
792}
793
794inline_size void
795fd_change (EV_P_ int fd, int flags)
796{
797 unsigned char reify = anfds [fd].reify;
798 anfds [fd].reify |= flags;
799
800 if (expect_true (!reify))
801 {
802 ++fdchangecnt;
803 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
804 fdchanges [fdchangecnt - 1] = fd;
805 }
806}
807
808inline_speed void
809fd_kill (EV_P_ int fd)
810{
811 ev_io *w;
812
813 while ((w = (ev_io *)anfds [fd].head))
814 {
815 ev_io_stop (EV_A_ w);
816 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
817 }
818}
819
820inline_size int
821fd_valid (int fd)
822{
823#ifdef _WIN32
824 return _get_osfhandle (fd) != -1;
825#else
826 return fcntl (fd, F_GETFD) != -1;
827#endif
828}
829
830/* called on EBADF to verify fds */
831static void noinline
832fd_ebadf (EV_P)
833{
834 int fd;
835
836 for (fd = 0; fd < anfdmax; ++fd)
837 if (anfds [fd].events)
838 if (!fd_valid (fd) && errno == EBADF)
839 fd_kill (EV_A_ fd);
840}
841
842/* called on ENOMEM in select/poll to kill some fds and retry */
843static void noinline
844fd_enomem (EV_P)
845{
846 int fd;
847
848 for (fd = anfdmax; fd--; )
849 if (anfds [fd].events)
850 {
851 fd_kill (EV_A_ fd);
852 return;
853 }
854}
855
856/* usually called after fork if backend needs to re-arm all fds from scratch */
857static void noinline
858fd_rearm_all (EV_P)
859{
860 int fd;
861
862 for (fd = 0; fd < anfdmax; ++fd)
863 if (anfds [fd].events)
864 {
865 anfds [fd].events = 0;
866 anfds [fd].emask = 0;
867 fd_change (EV_A_ fd, EV__IOFDSET | 1);
868 }
869}
870
871/*****************************************************************************/
872
873/*
874 * the heap functions want a real array index. array index 0 uis guaranteed to not
875 * be in-use at any time. the first heap entry is at array [HEAP0]. DHEAP gives
876 * the branching factor of the d-tree.
877 */
878
879/*
880 * at the moment we allow libev the luxury of two heaps,
881 * a small-code-size 2-heap one and a ~1.5kb larger 4-heap
882 * which is more cache-efficient.
883 * the difference is about 5% with 50000+ watchers.
884 */
885#if EV_USE_4HEAP
886
887#define DHEAP 4
888#define HEAP0 (DHEAP - 1) /* index of first element in heap */
889#define HPARENT(k) ((((k) - HEAP0 - 1) / DHEAP) + HEAP0)
890#define UPHEAP_DONE(p,k) ((p) == (k))
891
892/* away from the root */
893inline_speed void
894downheap (ANHE *heap, int N, int k)
895{
896 ANHE he = heap [k];
897 ANHE *E = heap + N + HEAP0;
898
899 for (;;)
900 {
901 ev_tstamp minat;
902 ANHE *minpos;
903 ANHE *pos = heap + DHEAP * (k - HEAP0) + HEAP0 + 1;
904
905 /* find minimum child */
906 if (expect_true (pos + DHEAP - 1 < E))
271 { 907 {
272 if (w->is_abs) 908 /* fast path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
273 w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat; 909 if ( ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
274 else 910 if ( ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
275 w->at = now + w->repeat; 911 if ( ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
276 912 }
277 assert (w->at > now); 913 else if (pos < E)
278 914 {
279 downheap (timers, timercnt, 0); 915 /* slow path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
916 if (pos + 1 < E && ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
917 if (pos + 2 < E && ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
918 if (pos + 3 < E && ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
280 } 919 }
281 else 920 else
921 break;
922
923 if (ANHE_at (he) <= minat)
924 break;
925
926 heap [k] = *minpos;
927 ev_active (ANHE_w (*minpos)) = k;
928
929 k = minpos - heap;
930 }
931
932 heap [k] = he;
933 ev_active (ANHE_w (he)) = k;
934}
935
936#else /* 4HEAP */
937
938#define HEAP0 1
939#define HPARENT(k) ((k) >> 1)
940#define UPHEAP_DONE(p,k) (!(p))
941
942/* away from the root */
943inline_speed void
944downheap (ANHE *heap, int N, int k)
945{
946 ANHE he = heap [k];
947
948 for (;;)
949 {
950 int c = k << 1;
951
952 if (c > N + HEAP0 - 1)
953 break;
954
955 c += c + 1 < N + HEAP0 && ANHE_at (heap [c]) > ANHE_at (heap [c + 1])
956 ? 1 : 0;
957
958 if (ANHE_at (he) <= ANHE_at (heap [c]))
959 break;
960
961 heap [k] = heap [c];
962 ev_active (ANHE_w (heap [k])) = k;
963
964 k = c;
965 }
966
967 heap [k] = he;
968 ev_active (ANHE_w (he)) = k;
969}
970#endif
971
972/* towards the root */
973inline_speed void
974upheap (ANHE *heap, int k)
975{
976 ANHE he = heap [k];
977
978 for (;;)
979 {
980 int p = HPARENT (k);
981
982 if (UPHEAP_DONE (p, k) || ANHE_at (heap [p]) <= ANHE_at (he))
983 break;
984
985 heap [k] = heap [p];
986 ev_active (ANHE_w (heap [k])) = k;
987 k = p;
988 }
989
990 heap [k] = he;
991 ev_active (ANHE_w (he)) = k;
992}
993
994inline_size void
995adjustheap (ANHE *heap, int N, int k)
996{
997 if (k > HEAP0 && ANHE_at (heap [HPARENT (k)]) >= ANHE_at (heap [k]))
998 upheap (heap, k);
999 else
1000 downheap (heap, N, k);
1001}
1002
1003/* rebuild the heap: this function is used only once and executed rarely */
1004inline_size void
1005reheap (ANHE *heap, int N)
1006{
1007 int i;
1008
1009 /* we don't use floyds algorithm, upheap is simpler and is more cache-efficient */
1010 /* also, this is easy to implement and correct for both 2-heaps and 4-heaps */
1011 for (i = 0; i < N; ++i)
1012 upheap (heap, i + HEAP0);
1013}
1014
1015/*****************************************************************************/
1016
1017typedef struct
1018{
1019 WL head;
1020 EV_ATOMIC_T gotsig;
1021} ANSIG;
1022
1023static ANSIG *signals;
1024static int signalmax;
1025
1026static EV_ATOMIC_T gotsig;
1027
1028/*****************************************************************************/
1029
1030inline_speed void
1031fd_intern (int fd)
1032{
1033#ifdef _WIN32
1034 unsigned long arg = 1;
1035 ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
1036#else
1037 fcntl (fd, F_SETFD, FD_CLOEXEC);
1038 fcntl (fd, F_SETFL, O_NONBLOCK);
1039#endif
1040}
1041
1042static void noinline
1043evpipe_init (EV_P)
1044{
1045 if (!ev_is_active (&pipeev))
1046 {
1047#if EV_USE_EVENTFD
1048 if ((evfd = eventfd (0, 0)) >= 0)
282 { 1049 {
283 evtimer_stop (w); /* nonrepeating: stop timer */ 1050 evpipe [0] = -1;
284 --timercnt; /* maybe pass by reference instead? */ 1051 fd_intern (evfd);
1052 ev_io_set (&pipeev, evfd, EV_READ);
285 } 1053 }
1054 else
1055#endif
1056 {
1057 while (pipe (evpipe))
1058 ev_syserr ("(libev) error creating signal/async pipe");
286 1059
287 event ((struct ev_watcher *)w, EV_TIMEOUT); 1060 fd_intern (evpipe [0]);
1061 fd_intern (evpipe [1]);
1062 ev_io_set (&pipeev, evpipe [0], EV_READ);
1063 }
1064
1065 ev_io_start (EV_A_ &pipeev);
1066 ev_unref (EV_A); /* watcher should not keep loop alive */
1067 }
1068}
1069
1070inline_size void
1071evpipe_write (EV_P_ EV_ATOMIC_T *flag)
1072{
1073 if (!*flag)
1074 {
1075 int old_errno = errno; /* save errno because write might clobber it */
1076
1077 *flag = 1;
1078
1079#if EV_USE_EVENTFD
1080 if (evfd >= 0)
1081 {
1082 uint64_t counter = 1;
1083 write (evfd, &counter, sizeof (uint64_t));
1084 }
1085 else
1086#endif
1087 write (evpipe [1], &old_errno, 1);
1088
1089 errno = old_errno;
288 } 1090 }
289} 1091}
290 1092
291static void 1093static void
292time_update () 1094pipecb (EV_P_ ev_io *iow, int revents)
1095{
1096#if EV_USE_EVENTFD
1097 if (evfd >= 0)
1098 {
1099 uint64_t counter;
1100 read (evfd, &counter, sizeof (uint64_t));
1101 }
1102 else
1103#endif
1104 {
1105 char dummy;
1106 read (evpipe [0], &dummy, 1);
1107 }
1108
1109 if (gotsig && ev_is_default_loop (EV_A))
1110 {
1111 int signum;
1112 gotsig = 0;
1113
1114 for (signum = signalmax; signum--; )
1115 if (signals [signum].gotsig)
1116 ev_feed_signal_event (EV_A_ signum + 1);
1117 }
1118
1119#if EV_ASYNC_ENABLE
1120 if (gotasync)
1121 {
1122 int i;
1123 gotasync = 0;
1124
1125 for (i = asynccnt; i--; )
1126 if (asyncs [i]->sent)
1127 {
1128 asyncs [i]->sent = 0;
1129 ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
1130 }
1131 }
1132#endif
1133}
1134
1135/*****************************************************************************/
1136
1137static void
1138ev_sighandler (int signum)
1139{
1140#if EV_MULTIPLICITY
1141 struct ev_loop *loop = &default_loop_struct;
1142#endif
1143
1144#if _WIN32
1145 signal (signum, ev_sighandler);
1146#endif
1147
1148 signals [signum - 1].gotsig = 1;
1149 evpipe_write (EV_A_ &gotsig);
1150}
1151
1152void noinline
1153ev_feed_signal_event (EV_P_ int signum)
1154{
1155 WL w;
1156
1157#if EV_MULTIPLICITY
1158 assert (("libev: feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
1159#endif
1160
1161 --signum;
1162
1163 if (signum < 0 || signum >= signalmax)
1164 return;
1165
1166 signals [signum].gotsig = 0;
1167
1168 for (w = signals [signum].head; w; w = w->next)
1169 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
1170}
1171
1172/*****************************************************************************/
1173
1174static WL childs [EV_PID_HASHSIZE];
1175
1176#ifndef _WIN32
1177
1178static ev_signal childev;
1179
1180#ifndef WIFCONTINUED
1181# define WIFCONTINUED(status) 0
1182#endif
1183
1184inline_speed void
1185child_reap (EV_P_ int chain, int pid, int status)
1186{
1187 ev_child *w;
1188 int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
1189
1190 for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
1191 {
1192 if ((w->pid == pid || !w->pid)
1193 && (!traced || (w->flags & 1)))
1194 {
1195 ev_set_priority (w, EV_MAXPRI); /* need to do it *now*, this *must* be the same prio as the signal watcher itself */
1196 w->rpid = pid;
1197 w->rstatus = status;
1198 ev_feed_event (EV_A_ (W)w, EV_CHILD);
1199 }
1200 }
1201}
1202
1203#ifndef WCONTINUED
1204# define WCONTINUED 0
1205#endif
1206
1207static void
1208childcb (EV_P_ ev_signal *sw, int revents)
1209{
1210 int pid, status;
1211
1212 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
1213 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
1214 if (!WCONTINUED
1215 || errno != EINVAL
1216 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
1217 return;
1218
1219 /* make sure we are called again until all children have been reaped */
1220 /* we need to do it this way so that the callback gets called before we continue */
1221 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
1222
1223 child_reap (EV_A_ pid, pid, status);
1224 if (EV_PID_HASHSIZE > 1)
1225 child_reap (EV_A_ 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
1226}
1227
1228#endif
1229
1230/*****************************************************************************/
1231
1232#if EV_USE_PORT
1233# include "ev_port.c"
1234#endif
1235#if EV_USE_KQUEUE
1236# include "ev_kqueue.c"
1237#endif
1238#if EV_USE_EPOLL
1239# include "ev_epoll.c"
1240#endif
1241#if EV_USE_POLL
1242# include "ev_poll.c"
1243#endif
1244#if EV_USE_SELECT
1245# include "ev_select.c"
1246#endif
1247
1248int
1249ev_version_major (void)
1250{
1251 return EV_VERSION_MAJOR;
1252}
1253
1254int
1255ev_version_minor (void)
1256{
1257 return EV_VERSION_MINOR;
1258}
1259
1260/* return true if we are running with elevated privileges and should ignore env variables */
1261int inline_size
1262enable_secure (void)
1263{
1264#ifdef _WIN32
1265 return 0;
1266#else
1267 return getuid () != geteuid ()
1268 || getgid () != getegid ();
1269#endif
1270}
1271
1272unsigned int
1273ev_supported_backends (void)
1274{
1275 unsigned int flags = 0;
1276
1277 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
1278 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
1279 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
1280 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
1281 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
1282
1283 return flags;
1284}
1285
1286unsigned int
1287ev_recommended_backends (void)
1288{
1289 unsigned int flags = ev_supported_backends ();
1290
1291#ifndef __NetBSD__
1292 /* kqueue is borked on everything but netbsd apparently */
1293 /* it usually doesn't work correctly on anything but sockets and pipes */
1294 flags &= ~EVBACKEND_KQUEUE;
1295#endif
1296#ifdef __APPLE__
1297 /* only select works correctly on that "unix-certified" platform */
1298 flags &= ~EVBACKEND_KQUEUE; /* horribly broken, even for sockets */
1299 flags &= ~EVBACKEND_POLL; /* poll is based on kqueue from 10.5 onwards */
1300#endif
1301
1302 return flags;
1303}
1304
1305unsigned int
1306ev_embeddable_backends (void)
1307{
1308 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
1309
1310 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
1311 /* please fix it and tell me how to detect the fix */
1312 flags &= ~EVBACKEND_EPOLL;
1313
1314 return flags;
1315}
1316
1317unsigned int
1318ev_backend (EV_P)
1319{
1320 return backend;
1321}
1322
1323unsigned int
1324ev_loop_count (EV_P)
1325{
1326 return loop_count;
1327}
1328
1329void
1330ev_set_io_collect_interval (EV_P_ ev_tstamp interval)
1331{
1332 io_blocktime = interval;
1333}
1334
1335void
1336ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval)
1337{
1338 timeout_blocktime = interval;
1339}
1340
1341static void noinline
1342loop_init (EV_P_ unsigned int flags)
1343{
1344 if (!backend)
1345 {
1346#if EV_USE_REALTIME
1347 if (!have_realtime)
1348 {
1349 struct timespec ts;
1350
1351 if (!clock_gettime (CLOCK_REALTIME, &ts))
1352 have_realtime = 1;
1353 }
1354#endif
1355
1356#if EV_USE_MONOTONIC
1357 if (!have_monotonic)
1358 {
1359 struct timespec ts;
1360
1361 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
1362 have_monotonic = 1;
1363 }
1364#endif
1365
1366 ev_rt_now = ev_time ();
1367 mn_now = get_clock ();
1368 now_floor = mn_now;
1369 rtmn_diff = ev_rt_now - mn_now;
1370
1371 io_blocktime = 0.;
1372 timeout_blocktime = 0.;
1373 backend = 0;
1374 backend_fd = -1;
1375 gotasync = 0;
1376#if EV_USE_INOTIFY
1377 fs_fd = -2;
1378#endif
1379
1380 /* pid check not overridable via env */
1381#ifndef _WIN32
1382 if (flags & EVFLAG_FORKCHECK)
1383 curpid = getpid ();
1384#endif
1385
1386 if (!(flags & EVFLAG_NOENV)
1387 && !enable_secure ()
1388 && getenv ("LIBEV_FLAGS"))
1389 flags = atoi (getenv ("LIBEV_FLAGS"));
1390
1391 if (!(flags & 0x0000ffffU))
1392 flags |= ev_recommended_backends ();
1393
1394#if EV_USE_PORT
1395 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
1396#endif
1397#if EV_USE_KQUEUE
1398 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
1399#endif
1400#if EV_USE_EPOLL
1401 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
1402#endif
1403#if EV_USE_POLL
1404 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
1405#endif
1406#if EV_USE_SELECT
1407 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
1408#endif
1409
1410 ev_init (&pipeev, pipecb);
1411 ev_set_priority (&pipeev, EV_MAXPRI);
1412 }
1413}
1414
1415static void noinline
1416loop_destroy (EV_P)
293{ 1417{
294 int i; 1418 int i;
295 ev_now = ev_time ();
296 1419
297 if (have_monotonic) 1420 if (ev_is_active (&pipeev))
298 { 1421 {
299 ev_tstamp odiff = diff; 1422 ev_ref (EV_A); /* signal watcher */
1423 ev_io_stop (EV_A_ &pipeev);
300 1424
301 /* detecting time jumps is much more difficult */ 1425#if EV_USE_EVENTFD
302 for (i = 2; --i; ) /* loop a few times, before making important decisions */ 1426 if (evfd >= 0)
1427 close (evfd);
1428#endif
1429
1430 if (evpipe [0] >= 0)
303 { 1431 {
1432 close (evpipe [0]);
1433 close (evpipe [1]);
1434 }
1435 }
1436
1437#if EV_USE_INOTIFY
1438 if (fs_fd >= 0)
1439 close (fs_fd);
1440#endif
1441
1442 if (backend_fd >= 0)
1443 close (backend_fd);
1444
1445#if EV_USE_PORT
1446 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
1447#endif
1448#if EV_USE_KQUEUE
1449 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
1450#endif
1451#if EV_USE_EPOLL
1452 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
1453#endif
1454#if EV_USE_POLL
1455 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
1456#endif
1457#if EV_USE_SELECT
1458 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
1459#endif
1460
1461 for (i = NUMPRI; i--; )
1462 {
1463 array_free (pending, [i]);
1464#if EV_IDLE_ENABLE
1465 array_free (idle, [i]);
1466#endif
1467 }
1468
1469 ev_free (anfds); anfdmax = 0;
1470
1471 /* have to use the microsoft-never-gets-it-right macro */
1472 array_free (rfeed, EMPTY);
1473 array_free (fdchange, EMPTY);
1474 array_free (timer, EMPTY);
1475#if EV_PERIODIC_ENABLE
1476 array_free (periodic, EMPTY);
1477#endif
1478#if EV_FORK_ENABLE
1479 array_free (fork, EMPTY);
1480#endif
1481 array_free (prepare, EMPTY);
1482 array_free (check, EMPTY);
1483#if EV_ASYNC_ENABLE
1484 array_free (async, EMPTY);
1485#endif
1486
1487 backend = 0;
1488}
1489
1490#if EV_USE_INOTIFY
1491inline_size void infy_fork (EV_P);
1492#endif
1493
1494inline_size void
1495loop_fork (EV_P)
1496{
1497#if EV_USE_PORT
1498 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
1499#endif
1500#if EV_USE_KQUEUE
1501 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
1502#endif
1503#if EV_USE_EPOLL
1504 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
1505#endif
1506#if EV_USE_INOTIFY
1507 infy_fork (EV_A);
1508#endif
1509
1510 if (ev_is_active (&pipeev))
1511 {
1512 /* this "locks" the handlers against writing to the pipe */
1513 /* while we modify the fd vars */
1514 gotsig = 1;
1515#if EV_ASYNC_ENABLE
1516 gotasync = 1;
1517#endif
1518
1519 ev_ref (EV_A);
1520 ev_io_stop (EV_A_ &pipeev);
1521
1522#if EV_USE_EVENTFD
1523 if (evfd >= 0)
1524 close (evfd);
1525#endif
1526
1527 if (evpipe [0] >= 0)
1528 {
1529 close (evpipe [0]);
1530 close (evpipe [1]);
1531 }
1532
1533 evpipe_init (EV_A);
1534 /* now iterate over everything, in case we missed something */
1535 pipecb (EV_A_ &pipeev, EV_READ);
1536 }
1537
1538 postfork = 0;
1539}
1540
1541#if EV_MULTIPLICITY
1542
1543struct ev_loop *
1544ev_loop_new (unsigned int flags)
1545{
1546 struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
1547
1548 memset (loop, 0, sizeof (struct ev_loop));
1549
1550 loop_init (EV_A_ flags);
1551
1552 if (ev_backend (EV_A))
1553 return loop;
1554
1555 return 0;
1556}
1557
1558void
1559ev_loop_destroy (EV_P)
1560{
1561 loop_destroy (EV_A);
1562 ev_free (loop);
1563}
1564
1565void
1566ev_loop_fork (EV_P)
1567{
1568 postfork = 1; /* must be in line with ev_default_fork */
1569}
1570
1571#if EV_VERIFY
1572static void noinline
1573verify_watcher (EV_P_ W w)
1574{
1575 assert (("libev: watcher has invalid priority", ABSPRI (w) >= 0 && ABSPRI (w) < NUMPRI));
1576
1577 if (w->pending)
1578 assert (("libev: pending watcher not on pending queue", pendings [ABSPRI (w)][w->pending - 1].w == w));
1579}
1580
1581static void noinline
1582verify_heap (EV_P_ ANHE *heap, int N)
1583{
1584 int i;
1585
1586 for (i = HEAP0; i < N + HEAP0; ++i)
1587 {
1588 assert (("libev: active index mismatch in heap", ev_active (ANHE_w (heap [i])) == i));
1589 assert (("libev: heap condition violated", i == HEAP0 || ANHE_at (heap [HPARENT (i)]) <= ANHE_at (heap [i])));
1590 assert (("libev: heap at cache mismatch", ANHE_at (heap [i]) == ev_at (ANHE_w (heap [i]))));
1591
1592 verify_watcher (EV_A_ (W)ANHE_w (heap [i]));
1593 }
1594}
1595
1596static void noinline
1597array_verify (EV_P_ W *ws, int cnt)
1598{
1599 while (cnt--)
1600 {
1601 assert (("libev: active index mismatch", ev_active (ws [cnt]) == cnt + 1));
1602 verify_watcher (EV_A_ ws [cnt]);
1603 }
1604}
1605#endif
1606
1607void
1608ev_loop_verify (EV_P)
1609{
1610#if EV_VERIFY
1611 int i;
1612 WL w;
1613
1614 assert (activecnt >= -1);
1615
1616 assert (fdchangemax >= fdchangecnt);
1617 for (i = 0; i < fdchangecnt; ++i)
1618 assert (("libev: negative fd in fdchanges", fdchanges [i] >= 0));
1619
1620 assert (anfdmax >= 0);
1621 for (i = 0; i < anfdmax; ++i)
1622 for (w = anfds [i].head; w; w = w->next)
1623 {
1624 verify_watcher (EV_A_ (W)w);
1625 assert (("libev: inactive fd watcher on anfd list", ev_active (w) == 1));
1626 assert (("libev: fd mismatch between watcher and anfd", ((ev_io *)w)->fd == i));
1627 }
1628
1629 assert (timermax >= timercnt);
1630 verify_heap (EV_A_ timers, timercnt);
1631
1632#if EV_PERIODIC_ENABLE
1633 assert (periodicmax >= periodiccnt);
1634 verify_heap (EV_A_ periodics, periodiccnt);
1635#endif
1636
1637 for (i = NUMPRI; i--; )
1638 {
1639 assert (pendingmax [i] >= pendingcnt [i]);
1640#if EV_IDLE_ENABLE
1641 assert (idleall >= 0);
1642 assert (idlemax [i] >= idlecnt [i]);
1643 array_verify (EV_A_ (W *)idles [i], idlecnt [i]);
1644#endif
1645 }
1646
1647#if EV_FORK_ENABLE
1648 assert (forkmax >= forkcnt);
1649 array_verify (EV_A_ (W *)forks, forkcnt);
1650#endif
1651
1652#if EV_ASYNC_ENABLE
1653 assert (asyncmax >= asynccnt);
1654 array_verify (EV_A_ (W *)asyncs, asynccnt);
1655#endif
1656
1657 assert (preparemax >= preparecnt);
1658 array_verify (EV_A_ (W *)prepares, preparecnt);
1659
1660 assert (checkmax >= checkcnt);
1661 array_verify (EV_A_ (W *)checks, checkcnt);
1662
1663# if 0
1664 for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
1665 for (signum = signalmax; signum--; ) if (signals [signum].gotsig)
1666# endif
1667#endif
1668}
1669
1670#endif /* multiplicity */
1671
1672#if EV_MULTIPLICITY
1673struct ev_loop *
1674ev_default_loop_init (unsigned int flags)
1675#else
1676int
1677ev_default_loop (unsigned int flags)
1678#endif
1679{
1680 if (!ev_default_loop_ptr)
1681 {
1682#if EV_MULTIPLICITY
1683 struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
1684#else
1685 ev_default_loop_ptr = 1;
1686#endif
1687
1688 loop_init (EV_A_ flags);
1689
1690 if (ev_backend (EV_A))
1691 {
1692#ifndef _WIN32
1693 ev_signal_init (&childev, childcb, SIGCHLD);
1694 ev_set_priority (&childev, EV_MAXPRI);
1695 ev_signal_start (EV_A_ &childev);
1696 ev_unref (EV_A); /* child watcher should not keep loop alive */
1697#endif
1698 }
1699 else
1700 ev_default_loop_ptr = 0;
1701 }
1702
1703 return ev_default_loop_ptr;
1704}
1705
1706void
1707ev_default_destroy (void)
1708{
1709#if EV_MULTIPLICITY
1710 struct ev_loop *loop = ev_default_loop_ptr;
1711#endif
1712
1713 ev_default_loop_ptr = 0;
1714
1715#ifndef _WIN32
1716 ev_ref (EV_A); /* child watcher */
1717 ev_signal_stop (EV_A_ &childev);
1718#endif
1719
1720 loop_destroy (EV_A);
1721}
1722
1723void
1724ev_default_fork (void)
1725{
1726#if EV_MULTIPLICITY
1727 struct ev_loop *loop = ev_default_loop_ptr;
1728#endif
1729
1730 postfork = 1; /* must be in line with ev_loop_fork */
1731}
1732
1733/*****************************************************************************/
1734
1735void
1736ev_invoke (EV_P_ void *w, int revents)
1737{
1738 EV_CB_INVOKE ((W)w, revents);
1739}
1740
1741inline_speed void
1742call_pending (EV_P)
1743{
1744 int pri;
1745
1746 for (pri = NUMPRI; pri--; )
1747 while (pendingcnt [pri])
1748 {
1749 ANPENDING *p = pendings [pri] + --pendingcnt [pri];
1750
1751 if (expect_true (p->w))
1752 {
1753 /*assert (("libev: non-pending watcher on pending list", p->w->pending));*/
1754
1755 p->w->pending = 0;
1756 EV_CB_INVOKE (p->w, p->events);
1757 EV_FREQUENT_CHECK;
1758 }
1759 }
1760}
1761
1762#if EV_IDLE_ENABLE
1763inline_size void
1764idle_reify (EV_P)
1765{
1766 if (expect_false (idleall))
1767 {
1768 int pri;
1769
1770 for (pri = NUMPRI; pri--; )
1771 {
1772 if (pendingcnt [pri])
1773 break;
1774
1775 if (idlecnt [pri])
1776 {
1777 queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
1778 break;
1779 }
1780 }
1781 }
1782}
1783#endif
1784
1785inline_size void
1786timers_reify (EV_P)
1787{
1788 EV_FREQUENT_CHECK;
1789
1790 if (timercnt && ANHE_at (timers [HEAP0]) < mn_now)
1791 {
1792 do
1793 {
1794 ev_timer *w = (ev_timer *)ANHE_w (timers [HEAP0]);
1795
1796 /*assert (("libev: inactive timer on timer heap detected", ev_is_active (w)));*/
1797
1798 /* first reschedule or stop timer */
1799 if (w->repeat)
1800 {
1801 ev_at (w) += w->repeat;
1802 if (ev_at (w) < mn_now)
1803 ev_at (w) = mn_now;
1804
1805 assert (("libev: negative ev_timer repeat value found while processing timers", w->repeat > 0.));
1806
1807 ANHE_at_cache (timers [HEAP0]);
1808 downheap (timers, timercnt, HEAP0);
1809 }
1810 else
1811 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
1812
1813 EV_FREQUENT_CHECK;
1814 feed_reverse (EV_A_ (W)w);
1815 }
1816 while (timercnt && ANHE_at (timers [HEAP0]) < mn_now);
1817
1818 feed_reverse_done (EV_A_ EV_TIMEOUT);
1819 }
1820}
1821
1822#if EV_PERIODIC_ENABLE
1823inline_size void
1824periodics_reify (EV_P)
1825{
1826 EV_FREQUENT_CHECK;
1827
1828 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now)
1829 {
1830 int feed_count = 0;
1831
1832 do
1833 {
1834 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [HEAP0]);
1835
1836 /*assert (("libev: inactive timer on periodic heap detected", ev_is_active (w)));*/
1837
1838 /* first reschedule or stop timer */
1839 if (w->reschedule_cb)
1840 {
1841 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
1842
1843 assert (("libev: ev_periodic reschedule callback returned time in the past", ev_at (w) >= ev_rt_now));
1844
1845 ANHE_at_cache (periodics [HEAP0]);
1846 downheap (periodics, periodiccnt, HEAP0);
1847 }
1848 else if (w->interval)
1849 {
1850 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
1851 /* if next trigger time is not sufficiently in the future, put it there */
1852 /* this might happen because of floating point inexactness */
1853 if (ev_at (w) - ev_rt_now < TIME_EPSILON)
1854 {
1855 ev_at (w) += w->interval;
1856
1857 /* if interval is unreasonably low we might still have a time in the past */
1858 /* so correct this. this will make the periodic very inexact, but the user */
1859 /* has effectively asked to get triggered more often than possible */
1860 if (ev_at (w) < ev_rt_now)
1861 ev_at (w) = ev_rt_now;
1862 }
1863
1864 ANHE_at_cache (periodics [HEAP0]);
1865 downheap (periodics, periodiccnt, HEAP0);
1866 }
1867 else
1868 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
1869
1870 EV_FREQUENT_CHECK;
1871 feed_reverse (EV_A_ (W)w);
1872 }
1873 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now);
1874
1875 feed_reverse_done (EV_A_ EV_PERIODIC);
1876 }
1877}
1878
1879static void noinline
1880periodics_reschedule (EV_P)
1881{
1882 int i;
1883
1884 /* adjust periodics after time jump */
1885 for (i = HEAP0; i < periodiccnt + HEAP0; ++i)
1886 {
1887 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [i]);
1888
1889 if (w->reschedule_cb)
1890 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
1891 else if (w->interval)
1892 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
1893
1894 ANHE_at_cache (periodics [i]);
1895 }
1896
1897 reheap (periodics, periodiccnt);
1898}
1899#endif
1900
1901static void noinline
1902timers_reschedule (EV_P_ ev_tstamp adjust)
1903{
1904 int i;
1905
1906 for (i = 0; i < timercnt; ++i)
1907 {
1908 ANHE *he = timers + i + HEAP0;
1909 ANHE_w (*he)->at += adjust;
1910 ANHE_at_cache (*he);
1911 }
1912}
1913
1914inline_speed void
1915time_update (EV_P_ ev_tstamp max_block)
1916{
1917 int i;
1918
1919#if EV_USE_MONOTONIC
1920 if (expect_true (have_monotonic))
1921 {
1922 ev_tstamp odiff = rtmn_diff;
1923
304 now = get_clock (); 1924 mn_now = get_clock ();
1925
1926 /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
1927 /* interpolate in the meantime */
1928 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
1929 {
1930 ev_rt_now = rtmn_diff + mn_now;
1931 return;
1932 }
1933
1934 now_floor = mn_now;
1935 ev_rt_now = ev_time ();
1936
1937 /* loop a few times, before making important decisions.
1938 * on the choice of "4": one iteration isn't enough,
1939 * in case we get preempted during the calls to
1940 * ev_time and get_clock. a second call is almost guaranteed
1941 * to succeed in that case, though. and looping a few more times
1942 * doesn't hurt either as we only do this on time-jumps or
1943 * in the unlikely event of having been preempted here.
1944 */
1945 for (i = 4; --i; )
1946 {
305 diff = ev_now - now; 1947 rtmn_diff = ev_rt_now - mn_now;
306 1948
307 if (fabs (odiff - diff) < MIN_TIMEJUMP) 1949 if (expect_true (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP))
308 return; /* all is well */ 1950 return; /* all is well */
309 1951
310 ev_now = ev_time (); 1952 ev_rt_now = ev_time ();
1953 mn_now = get_clock ();
1954 now_floor = mn_now;
311 } 1955 }
312 1956
313 /* time jump detected, reschedule atimers */ 1957 /* no timer adjustment, as the monotonic clock doesn't jump */
314 for (i = 0; i < atimercnt; ++i) 1958 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
1959# if EV_PERIODIC_ENABLE
1960 periodics_reschedule (EV_A);
1961# endif
1962 }
1963 else
1964#endif
1965 {
1966 ev_rt_now = ev_time ();
1967
1968 if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
315 { 1969 {
316 struct ev_timer *w = atimers [i]; 1970 /* adjust timers. this is easy, as the offset is the same for all of them */
317 w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat; 1971 timers_reschedule (EV_A_ ev_rt_now - mn_now);
1972#if EV_PERIODIC_ENABLE
1973 periodics_reschedule (EV_A);
1974#endif
318 } 1975 }
319 }
320 else
321 {
322 if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
323 /* time jump detected, adjust rtimers */
324 for (i = 0; i < rtimercnt; ++i)
325 rtimers [i]->at += ev_now - now;
326 1976
327 now = ev_now; 1977 mn_now = ev_rt_now;
328 } 1978 }
329} 1979}
330 1980
331int ev_loop_done; 1981static int loop_done;
332 1982
1983void
333void ev_loop (int flags) 1984ev_loop (EV_P_ int flags)
334{ 1985{
335 double block; 1986 loop_done = EVUNLOOP_CANCEL;
336 ev_loop_done = flags & EVLOOP_ONESHOT; 1987
1988 call_pending (EV_A); /* in case we recurse, ensure ordering stays nice and clean */
337 1989
338 do 1990 do
339 { 1991 {
1992#if EV_VERIFY >= 2
1993 ev_loop_verify (EV_A);
1994#endif
1995
1996#ifndef _WIN32
1997 if (expect_false (curpid)) /* penalise the forking check even more */
1998 if (expect_false (getpid () != curpid))
1999 {
2000 curpid = getpid ();
2001 postfork = 1;
2002 }
2003#endif
2004
2005#if EV_FORK_ENABLE
2006 /* we might have forked, so queue fork handlers */
2007 if (expect_false (postfork))
2008 if (forkcnt)
2009 {
2010 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
2011 call_pending (EV_A);
2012 }
2013#endif
2014
2015 /* queue prepare watchers (and execute them) */
2016 if (expect_false (preparecnt))
2017 {
2018 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
2019 call_pending (EV_A);
2020 }
2021
2022 /* we might have forked, so reify kernel state if necessary */
2023 if (expect_false (postfork))
2024 loop_fork (EV_A);
2025
340 /* update fd-related kernel structures */ 2026 /* update fd-related kernel structures */
341 method_reify (); fdchangecnt = 0; 2027 fd_reify (EV_A);
342 2028
343 /* calculate blocking time */ 2029 /* calculate blocking time */
344 if (flags & EVLOOP_NONBLOCK) 2030 {
345 block = 0.; 2031 ev_tstamp waittime = 0.;
346 else 2032 ev_tstamp sleeptime = 0.;
2033
2034 if (expect_true (!(flags & EVLOOP_NONBLOCK || idleall || !activecnt)))
347 { 2035 {
2036 /* update time to cancel out callback processing overhead */
2037 time_update (EV_A_ 1e100);
2038
348 block = MAX_BLOCKTIME; 2039 waittime = MAX_BLOCKTIME;
349 2040
350 if (rtimercnt) 2041 if (timercnt)
351 { 2042 {
352 ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge; 2043 ev_tstamp to = ANHE_at (timers [HEAP0]) - mn_now + backend_fudge;
353 if (block > to) block = to; 2044 if (waittime > to) waittime = to;
354 } 2045 }
355 2046
2047#if EV_PERIODIC_ENABLE
356 if (atimercnt) 2048 if (periodiccnt)
357 { 2049 {
358 ev_tstamp to = atimers [0]->at - ev_time () + method_fudge; 2050 ev_tstamp to = ANHE_at (periodics [HEAP0]) - ev_rt_now + backend_fudge;
359 if (block > to) block = to; 2051 if (waittime > to) waittime = to;
360 } 2052 }
2053#endif
361 2054
362 if (block < 0.) block = 0.; 2055 if (expect_false (waittime < timeout_blocktime))
2056 waittime = timeout_blocktime;
2057
2058 sleeptime = waittime - backend_fudge;
2059
2060 if (expect_true (sleeptime > io_blocktime))
2061 sleeptime = io_blocktime;
2062
2063 if (sleeptime)
2064 {
2065 ev_sleep (sleeptime);
2066 waittime -= sleeptime;
2067 }
363 } 2068 }
364 2069
365 method_poll (block); 2070 ++loop_count;
2071 backend_poll (EV_A_ waittime);
366 2072
367 /* update ev_now, do magic */ 2073 /* update ev_rt_now, do magic */
368 time_update (); 2074 time_update (EV_A_ waittime + sleeptime);
2075 }
369 2076
370 /* put pending timers into pendign queue and reschedule them */ 2077 /* queue pending timers and reschedule them */
371 /* absolute timers first */ 2078 timers_reify (EV_A); /* relative timers called last */
372 timers_reify (atimers, atimercnt, ev_now); 2079#if EV_PERIODIC_ENABLE
373 /* relative timers second */ 2080 periodics_reify (EV_A); /* absolute timers called first */
374 timers_reify (rtimers, rtimercnt, now); 2081#endif
375 2082
2083#if EV_IDLE_ENABLE
2084 /* queue idle watchers unless other events are pending */
2085 idle_reify (EV_A);
2086#endif
2087
2088 /* queue check watchers, to be executed first */
2089 if (expect_false (checkcnt))
2090 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
2091
376 call_pending (); 2092 call_pending (EV_A);
377 } 2093 }
378 while (!ev_loop_done); 2094 while (expect_true (
379} 2095 activecnt
2096 && !loop_done
2097 && !(flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK))
2098 ));
380 2099
381static void 2100 if (loop_done == EVUNLOOP_ONE)
382wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem) 2101 loop_done = EVUNLOOP_CANCEL;
2102}
2103
2104void
2105ev_unloop (EV_P_ int how)
2106{
2107 loop_done = how;
2108}
2109
2110void
2111ev_ref (EV_P)
2112{
2113 ++activecnt;
2114}
2115
2116void
2117ev_unref (EV_P)
2118{
2119 --activecnt;
2120}
2121
2122void
2123ev_now_update (EV_P)
2124{
2125 time_update (EV_A_ 1e100);
2126}
2127
2128void
2129ev_suspend (EV_P)
2130{
2131 ev_now_update (EV_A);
2132}
2133
2134void
2135ev_resume (EV_P)
2136{
2137 ev_tstamp mn_prev = mn_now;
2138
2139 ev_now_update (EV_A);
2140 timers_reschedule (EV_A_ mn_now - mn_prev);
2141#if EV_PERIODIC_ENABLE
2142 periodics_reschedule (EV_A);
2143#endif
2144}
2145
2146/*****************************************************************************/
2147
2148inline_size void
2149wlist_add (WL *head, WL elem)
383{ 2150{
384 elem->next = *head; 2151 elem->next = *head;
385 *head = elem; 2152 *head = elem;
386} 2153}
387 2154
388static void 2155inline_size void
389wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem) 2156wlist_del (WL *head, WL elem)
390{ 2157{
391 while (*head) 2158 while (*head)
392 { 2159 {
393 if (*head == elem) 2160 if (*head == elem)
394 { 2161 {
… …
398 2165
399 head = &(*head)->next; 2166 head = &(*head)->next;
400 } 2167 }
401} 2168}
402 2169
2170inline_speed void
2171clear_pending (EV_P_ W w)
2172{
2173 if (w->pending)
2174 {
2175 pendings [ABSPRI (w)][w->pending - 1].w = 0;
2176 w->pending = 0;
2177 }
2178}
2179
2180int
2181ev_clear_pending (EV_P_ void *w)
2182{
2183 W w_ = (W)w;
2184 int pending = w_->pending;
2185
2186 if (expect_true (pending))
2187 {
2188 ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
2189 w_->pending = 0;
2190 p->w = 0;
2191 return p->events;
2192 }
2193 else
2194 return 0;
2195}
2196
2197inline_size void
2198pri_adjust (EV_P_ W w)
2199{
2200 int pri = w->priority;
2201 pri = pri < EV_MINPRI ? EV_MINPRI : pri;
2202 pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
2203 w->priority = pri;
2204}
2205
2206inline_speed void
2207ev_start (EV_P_ W w, int active)
2208{
2209 pri_adjust (EV_A_ w);
2210 w->active = active;
2211 ev_ref (EV_A);
2212}
2213
2214inline_size void
2215ev_stop (EV_P_ W w)
2216{
2217 ev_unref (EV_A);
2218 w->active = 0;
2219}
2220
2221/*****************************************************************************/
2222
2223void noinline
2224ev_io_start (EV_P_ ev_io *w)
2225{
2226 int fd = w->fd;
2227
2228 if (expect_false (ev_is_active (w)))
2229 return;
2230
2231 assert (("libev: ev_io_start called with negative fd", fd >= 0));
2232 assert (("libev: ev_io start called with illegal event mask", !(w->events & ~(EV__IOFDSET | EV_READ | EV_WRITE))));
2233
2234 EV_FREQUENT_CHECK;
2235
2236 ev_start (EV_A_ (W)w, 1);
2237 array_needsize (ANFD, anfds, anfdmax, fd + 1, array_init_zero);
2238 wlist_add (&anfds[fd].head, (WL)w);
2239
2240 fd_change (EV_A_ fd, w->events & EV__IOFDSET | 1);
2241 w->events &= ~EV__IOFDSET;
2242
2243 EV_FREQUENT_CHECK;
2244}
2245
2246void noinline
2247ev_io_stop (EV_P_ ev_io *w)
2248{
2249 clear_pending (EV_A_ (W)w);
2250 if (expect_false (!ev_is_active (w)))
2251 return;
2252
2253 assert (("libev: ev_io_stop called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
2254
2255 EV_FREQUENT_CHECK;
2256
2257 wlist_del (&anfds[w->fd].head, (WL)w);
2258 ev_stop (EV_A_ (W)w);
2259
2260 fd_change (EV_A_ w->fd, 1);
2261
2262 EV_FREQUENT_CHECK;
2263}
2264
2265void noinline
2266ev_timer_start (EV_P_ ev_timer *w)
2267{
2268 if (expect_false (ev_is_active (w)))
2269 return;
2270
2271 ev_at (w) += mn_now;
2272
2273 assert (("libev: ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
2274
2275 EV_FREQUENT_CHECK;
2276
2277 ++timercnt;
2278 ev_start (EV_A_ (W)w, timercnt + HEAP0 - 1);
2279 array_needsize (ANHE, timers, timermax, ev_active (w) + 1, EMPTY2);
2280 ANHE_w (timers [ev_active (w)]) = (WT)w;
2281 ANHE_at_cache (timers [ev_active (w)]);
2282 upheap (timers, ev_active (w));
2283
2284 EV_FREQUENT_CHECK;
2285
2286 /*assert (("libev: internal timer heap corruption", timers [ev_active (w)] == (WT)w));*/
2287}
2288
2289void noinline
2290ev_timer_stop (EV_P_ ev_timer *w)
2291{
2292 clear_pending (EV_A_ (W)w);
2293 if (expect_false (!ev_is_active (w)))
2294 return;
2295
2296 EV_FREQUENT_CHECK;
2297
2298 {
2299 int active = ev_active (w);
2300
2301 assert (("libev: internal timer heap corruption", ANHE_w (timers [active]) == (WT)w));
2302
2303 --timercnt;
2304
2305 if (expect_true (active < timercnt + HEAP0))
2306 {
2307 timers [active] = timers [timercnt + HEAP0];
2308 adjustheap (timers, timercnt, active);
2309 }
2310 }
2311
2312 EV_FREQUENT_CHECK;
2313
2314 ev_at (w) -= mn_now;
2315
2316 ev_stop (EV_A_ (W)w);
2317}
2318
2319void noinline
2320ev_timer_again (EV_P_ ev_timer *w)
2321{
2322 EV_FREQUENT_CHECK;
2323
2324 if (ev_is_active (w))
2325 {
2326 if (w->repeat)
2327 {
2328 ev_at (w) = mn_now + w->repeat;
2329 ANHE_at_cache (timers [ev_active (w)]);
2330 adjustheap (timers, timercnt, ev_active (w));
2331 }
2332 else
2333 ev_timer_stop (EV_A_ w);
2334 }
2335 else if (w->repeat)
2336 {
2337 ev_at (w) = w->repeat;
2338 ev_timer_start (EV_A_ w);
2339 }
2340
2341 EV_FREQUENT_CHECK;
2342}
2343
2344#if EV_PERIODIC_ENABLE
2345void noinline
2346ev_periodic_start (EV_P_ ev_periodic *w)
2347{
2348 if (expect_false (ev_is_active (w)))
2349 return;
2350
2351 if (w->reschedule_cb)
2352 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2353 else if (w->interval)
2354 {
2355 assert (("libev: ev_periodic_start called with negative interval value", w->interval >= 0.));
2356 /* this formula differs from the one in periodic_reify because we do not always round up */
2357 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
2358 }
2359 else
2360 ev_at (w) = w->offset;
2361
2362 EV_FREQUENT_CHECK;
2363
2364 ++periodiccnt;
2365 ev_start (EV_A_ (W)w, periodiccnt + HEAP0 - 1);
2366 array_needsize (ANHE, periodics, periodicmax, ev_active (w) + 1, EMPTY2);
2367 ANHE_w (periodics [ev_active (w)]) = (WT)w;
2368 ANHE_at_cache (periodics [ev_active (w)]);
2369 upheap (periodics, ev_active (w));
2370
2371 EV_FREQUENT_CHECK;
2372
2373 /*assert (("libev: internal periodic heap corruption", ANHE_w (periodics [ev_active (w)]) == (WT)w));*/
2374}
2375
2376void noinline
2377ev_periodic_stop (EV_P_ ev_periodic *w)
2378{
2379 clear_pending (EV_A_ (W)w);
2380 if (expect_false (!ev_is_active (w)))
2381 return;
2382
2383 EV_FREQUENT_CHECK;
2384
2385 {
2386 int active = ev_active (w);
2387
2388 assert (("libev: internal periodic heap corruption", ANHE_w (periodics [active]) == (WT)w));
2389
2390 --periodiccnt;
2391
2392 if (expect_true (active < periodiccnt + HEAP0))
2393 {
2394 periodics [active] = periodics [periodiccnt + HEAP0];
2395 adjustheap (periodics, periodiccnt, active);
2396 }
2397 }
2398
2399 EV_FREQUENT_CHECK;
2400
2401 ev_stop (EV_A_ (W)w);
2402}
2403
2404void noinline
2405ev_periodic_again (EV_P_ ev_periodic *w)
2406{
2407 /* TODO: use adjustheap and recalculation */
2408 ev_periodic_stop (EV_A_ w);
2409 ev_periodic_start (EV_A_ w);
2410}
2411#endif
2412
2413#ifndef SA_RESTART
2414# define SA_RESTART 0
2415#endif
2416
2417void noinline
2418ev_signal_start (EV_P_ ev_signal *w)
2419{
2420#if EV_MULTIPLICITY
2421 assert (("libev: signal watchers are only supported in the default loop", loop == ev_default_loop_ptr));
2422#endif
2423 if (expect_false (ev_is_active (w)))
2424 return;
2425
2426 assert (("libev: ev_signal_start called with illegal signal number", w->signum > 0));
2427
2428 evpipe_init (EV_A);
2429
2430 EV_FREQUENT_CHECK;
2431
2432 {
2433#ifndef _WIN32
2434 sigset_t full, prev;
2435 sigfillset (&full);
2436 sigprocmask (SIG_SETMASK, &full, &prev);
2437#endif
2438
2439 array_needsize (ANSIG, signals, signalmax, w->signum, array_init_zero);
2440
2441#ifndef _WIN32
2442 sigprocmask (SIG_SETMASK, &prev, 0);
2443#endif
2444 }
2445
2446 ev_start (EV_A_ (W)w, 1);
2447 wlist_add (&signals [w->signum - 1].head, (WL)w);
2448
2449 if (!((WL)w)->next)
2450 {
2451#if _WIN32
2452 signal (w->signum, ev_sighandler);
2453#else
2454 struct sigaction sa;
2455 sa.sa_handler = ev_sighandler;
2456 sigfillset (&sa.sa_mask);
2457 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
2458 sigaction (w->signum, &sa, 0);
2459#endif
2460 }
2461
2462 EV_FREQUENT_CHECK;
2463}
2464
2465void noinline
2466ev_signal_stop (EV_P_ ev_signal *w)
2467{
2468 clear_pending (EV_A_ (W)w);
2469 if (expect_false (!ev_is_active (w)))
2470 return;
2471
2472 EV_FREQUENT_CHECK;
2473
2474 wlist_del (&signals [w->signum - 1].head, (WL)w);
2475 ev_stop (EV_A_ (W)w);
2476
2477 if (!signals [w->signum - 1].head)
2478 signal (w->signum, SIG_DFL);
2479
2480 EV_FREQUENT_CHECK;
2481}
2482
2483void
2484ev_child_start (EV_P_ ev_child *w)
2485{
2486#if EV_MULTIPLICITY
2487 assert (("libev: child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
2488#endif
2489 if (expect_false (ev_is_active (w)))
2490 return;
2491
2492 EV_FREQUENT_CHECK;
2493
2494 ev_start (EV_A_ (W)w, 1);
2495 wlist_add (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
2496
2497 EV_FREQUENT_CHECK;
2498}
2499
2500void
2501ev_child_stop (EV_P_ ev_child *w)
2502{
2503 clear_pending (EV_A_ (W)w);
2504 if (expect_false (!ev_is_active (w)))
2505 return;
2506
2507 EV_FREQUENT_CHECK;
2508
2509 wlist_del (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
2510 ev_stop (EV_A_ (W)w);
2511
2512 EV_FREQUENT_CHECK;
2513}
2514
2515#if EV_STAT_ENABLE
2516
2517# ifdef _WIN32
2518# undef lstat
2519# define lstat(a,b) _stati64 (a,b)
2520# endif
2521
2522#define DEF_STAT_INTERVAL 5.0074891
2523#define NFS_STAT_INTERVAL 30.1074891 /* for filesystems potentially failing inotify */
2524#define MIN_STAT_INTERVAL 0.1074891
2525
2526static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
2527
2528#if EV_USE_INOTIFY
2529# define EV_INOTIFY_BUFSIZE 8192
2530
2531static void noinline
2532infy_add (EV_P_ ev_stat *w)
2533{
2534 w->wd = inotify_add_watch (fs_fd, w->path, IN_ATTRIB | IN_DELETE_SELF | IN_MOVE_SELF | IN_MODIFY | IN_DONT_FOLLOW | IN_MASK_ADD);
2535
2536 if (w->wd < 0)
2537 {
2538 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
2539 ev_timer_again (EV_A_ &w->timer); /* this is not race-free, so we still need to recheck periodically */
2540
2541 /* monitor some parent directory for speedup hints */
2542 /* note that exceeding the hardcoded path limit is not a correctness issue, */
2543 /* but an efficiency issue only */
2544 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
2545 {
2546 char path [4096];
2547 strcpy (path, w->path);
2548
2549 do
2550 {
2551 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
2552 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
2553
2554 char *pend = strrchr (path, '/');
2555
2556 if (!pend || pend == path)
2557 break;
2558
2559 *pend = 0;
2560 w->wd = inotify_add_watch (fs_fd, path, mask);
2561 }
2562 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
2563 }
2564 }
2565
2566 if (w->wd >= 0)
2567 {
2568 wlist_add (&fs_hash [w->wd & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
2569
2570 /* now local changes will be tracked by inotify, but remote changes won't */
2571 /* unless the filesystem it known to be local, we therefore still poll */
2572 /* also do poll on <2.6.25, but with normal frequency */
2573 struct statfs sfs;
2574
2575 if (fs_2625 && !statfs (w->path, &sfs))
2576 if (sfs.f_type == 0x1373 /* devfs */
2577 || sfs.f_type == 0xEF53 /* ext2/3 */
2578 || sfs.f_type == 0x3153464a /* jfs */
2579 || sfs.f_type == 0x52654973 /* reiser3 */
2580 || sfs.f_type == 0x01021994 /* tempfs */
2581 || sfs.f_type == 0x58465342 /* xfs */)
2582 return;
2583
2584 w->timer.repeat = w->interval ? w->interval : fs_2625 ? NFS_STAT_INTERVAL : DEF_STAT_INTERVAL;
2585 ev_timer_again (EV_A_ &w->timer);
2586 }
2587}
2588
2589static void noinline
2590infy_del (EV_P_ ev_stat *w)
2591{
2592 int slot;
2593 int wd = w->wd;
2594
2595 if (wd < 0)
2596 return;
2597
2598 w->wd = -2;
2599 slot = wd & (EV_INOTIFY_HASHSIZE - 1);
2600 wlist_del (&fs_hash [slot].head, (WL)w);
2601
2602 /* remove this watcher, if others are watching it, they will rearm */
2603 inotify_rm_watch (fs_fd, wd);
2604}
2605
2606static void noinline
2607infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
2608{
2609 if (slot < 0)
2610 /* overflow, need to check for all hash slots */
2611 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
2612 infy_wd (EV_A_ slot, wd, ev);
2613 else
2614 {
2615 WL w_;
2616
2617 for (w_ = fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head; w_; )
2618 {
2619 ev_stat *w = (ev_stat *)w_;
2620 w_ = w_->next; /* lets us remove this watcher and all before it */
2621
2622 if (w->wd == wd || wd == -1)
2623 {
2624 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
2625 {
2626 wlist_del (&fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
2627 w->wd = -1;
2628 infy_add (EV_A_ w); /* re-add, no matter what */
2629 }
2630
2631 stat_timer_cb (EV_A_ &w->timer, 0);
2632 }
2633 }
2634 }
2635}
2636
403static void 2637static void
404ev_start (struct ev_watcher *w, int active) 2638infy_cb (EV_P_ ev_io *w, int revents)
405{ 2639{
406 w->pending = 0; 2640 char buf [EV_INOTIFY_BUFSIZE];
407 w->active = active; 2641 struct inotify_event *ev = (struct inotify_event *)buf;
2642 int ofs;
2643 int len = read (fs_fd, buf, sizeof (buf));
2644
2645 for (ofs = 0; ofs < len; ofs += sizeof (struct inotify_event) + ev->len)
2646 infy_wd (EV_A_ ev->wd, ev->wd, ev);
2647}
2648
2649inline_size void
2650check_2625 (EV_P)
2651{
2652 /* kernels < 2.6.25 are borked
2653 * http://www.ussg.indiana.edu/hypermail/linux/kernel/0711.3/1208.html
2654 */
2655 struct utsname buf;
2656 int major, minor, micro;
2657
2658 if (uname (&buf))
2659 return;
2660
2661 if (sscanf (buf.release, "%d.%d.%d", &major, &minor, &micro) != 3)
2662 return;
2663
2664 if (major < 2
2665 || (major == 2 && minor < 6)
2666 || (major == 2 && minor == 6 && micro < 25))
2667 return;
2668
2669 fs_2625 = 1;
2670}
2671
2672inline_size void
2673infy_init (EV_P)
2674{
2675 if (fs_fd != -2)
2676 return;
2677
2678 fs_fd = -1;
2679
2680 check_2625 (EV_A);
2681
2682 fs_fd = inotify_init ();
2683
2684 if (fs_fd >= 0)
2685 {
2686 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
2687 ev_set_priority (&fs_w, EV_MAXPRI);
2688 ev_io_start (EV_A_ &fs_w);
2689 }
2690}
2691
2692inline_size void
2693infy_fork (EV_P)
2694{
2695 int slot;
2696
2697 if (fs_fd < 0)
2698 return;
2699
2700 close (fs_fd);
2701 fs_fd = inotify_init ();
2702
2703 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
2704 {
2705 WL w_ = fs_hash [slot].head;
2706 fs_hash [slot].head = 0;
2707
2708 while (w_)
2709 {
2710 ev_stat *w = (ev_stat *)w_;
2711 w_ = w_->next; /* lets us add this watcher */
2712
2713 w->wd = -1;
2714
2715 if (fs_fd >= 0)
2716 infy_add (EV_A_ w); /* re-add, no matter what */
2717 else
2718 ev_timer_again (EV_A_ &w->timer);
2719 }
2720 }
2721}
2722
2723#endif
2724
2725#ifdef _WIN32
2726# define EV_LSTAT(p,b) _stati64 (p, b)
2727#else
2728# define EV_LSTAT(p,b) lstat (p, b)
2729#endif
2730
2731void
2732ev_stat_stat (EV_P_ ev_stat *w)
2733{
2734 if (lstat (w->path, &w->attr) < 0)
2735 w->attr.st_nlink = 0;
2736 else if (!w->attr.st_nlink)
2737 w->attr.st_nlink = 1;
2738}
2739
2740static void noinline
2741stat_timer_cb (EV_P_ ev_timer *w_, int revents)
2742{
2743 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
2744
2745 /* we copy this here each the time so that */
2746 /* prev has the old value when the callback gets invoked */
2747 w->prev = w->attr;
2748 ev_stat_stat (EV_A_ w);
2749
2750 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
2751 if (
2752 w->prev.st_dev != w->attr.st_dev
2753 || w->prev.st_ino != w->attr.st_ino
2754 || w->prev.st_mode != w->attr.st_mode
2755 || w->prev.st_nlink != w->attr.st_nlink
2756 || w->prev.st_uid != w->attr.st_uid
2757 || w->prev.st_gid != w->attr.st_gid
2758 || w->prev.st_rdev != w->attr.st_rdev
2759 || w->prev.st_size != w->attr.st_size
2760 || w->prev.st_atime != w->attr.st_atime
2761 || w->prev.st_mtime != w->attr.st_mtime
2762 || w->prev.st_ctime != w->attr.st_ctime
2763 ) {
2764 #if EV_USE_INOTIFY
2765 if (fs_fd >= 0)
2766 {
2767 infy_del (EV_A_ w);
2768 infy_add (EV_A_ w);
2769 ev_stat_stat (EV_A_ w); /* avoid race... */
2770 }
2771 #endif
2772
2773 ev_feed_event (EV_A_ w, EV_STAT);
2774 }
2775}
2776
2777void
2778ev_stat_start (EV_P_ ev_stat *w)
2779{
2780 if (expect_false (ev_is_active (w)))
2781 return;
2782
2783 ev_stat_stat (EV_A_ w);
2784
2785 if (w->interval < MIN_STAT_INTERVAL && w->interval)
2786 w->interval = MIN_STAT_INTERVAL;
2787
2788 ev_timer_init (&w->timer, stat_timer_cb, 0., w->interval ? w->interval : DEF_STAT_INTERVAL);
2789 ev_set_priority (&w->timer, ev_priority (w));
2790
2791#if EV_USE_INOTIFY
2792 infy_init (EV_A);
2793
2794 if (fs_fd >= 0)
2795 infy_add (EV_A_ w);
2796 else
2797#endif
2798 ev_timer_again (EV_A_ &w->timer);
2799
2800 ev_start (EV_A_ (W)w, 1);
2801
2802 EV_FREQUENT_CHECK;
2803}
2804
2805void
2806ev_stat_stop (EV_P_ ev_stat *w)
2807{
2808 clear_pending (EV_A_ (W)w);
2809 if (expect_false (!ev_is_active (w)))
2810 return;
2811
2812 EV_FREQUENT_CHECK;
2813
2814#if EV_USE_INOTIFY
2815 infy_del (EV_A_ w);
2816#endif
2817 ev_timer_stop (EV_A_ &w->timer);
2818
2819 ev_stop (EV_A_ (W)w);
2820
2821 EV_FREQUENT_CHECK;
2822}
2823#endif
2824
2825#if EV_IDLE_ENABLE
2826void
2827ev_idle_start (EV_P_ ev_idle *w)
2828{
2829 if (expect_false (ev_is_active (w)))
2830 return;
2831
2832 pri_adjust (EV_A_ (W)w);
2833
2834 EV_FREQUENT_CHECK;
2835
2836 {
2837 int active = ++idlecnt [ABSPRI (w)];
2838
2839 ++idleall;
2840 ev_start (EV_A_ (W)w, active);
2841
2842 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
2843 idles [ABSPRI (w)][active - 1] = w;
2844 }
2845
2846 EV_FREQUENT_CHECK;
2847}
2848
2849void
2850ev_idle_stop (EV_P_ ev_idle *w)
2851{
2852 clear_pending (EV_A_ (W)w);
2853 if (expect_false (!ev_is_active (w)))
2854 return;
2855
2856 EV_FREQUENT_CHECK;
2857
2858 {
2859 int active = ev_active (w);
2860
2861 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
2862 ev_active (idles [ABSPRI (w)][active - 1]) = active;
2863
2864 ev_stop (EV_A_ (W)w);
2865 --idleall;
2866 }
2867
2868 EV_FREQUENT_CHECK;
2869}
2870#endif
2871
2872void
2873ev_prepare_start (EV_P_ ev_prepare *w)
2874{
2875 if (expect_false (ev_is_active (w)))
2876 return;
2877
2878 EV_FREQUENT_CHECK;
2879
2880 ev_start (EV_A_ (W)w, ++preparecnt);
2881 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
2882 prepares [preparecnt - 1] = w;
2883
2884 EV_FREQUENT_CHECK;
2885}
2886
2887void
2888ev_prepare_stop (EV_P_ ev_prepare *w)
2889{
2890 clear_pending (EV_A_ (W)w);
2891 if (expect_false (!ev_is_active (w)))
2892 return;
2893
2894 EV_FREQUENT_CHECK;
2895
2896 {
2897 int active = ev_active (w);
2898
2899 prepares [active - 1] = prepares [--preparecnt];
2900 ev_active (prepares [active - 1]) = active;
2901 }
2902
2903 ev_stop (EV_A_ (W)w);
2904
2905 EV_FREQUENT_CHECK;
2906}
2907
2908void
2909ev_check_start (EV_P_ ev_check *w)
2910{
2911 if (expect_false (ev_is_active (w)))
2912 return;
2913
2914 EV_FREQUENT_CHECK;
2915
2916 ev_start (EV_A_ (W)w, ++checkcnt);
2917 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
2918 checks [checkcnt - 1] = w;
2919
2920 EV_FREQUENT_CHECK;
2921}
2922
2923void
2924ev_check_stop (EV_P_ ev_check *w)
2925{
2926 clear_pending (EV_A_ (W)w);
2927 if (expect_false (!ev_is_active (w)))
2928 return;
2929
2930 EV_FREQUENT_CHECK;
2931
2932 {
2933 int active = ev_active (w);
2934
2935 checks [active - 1] = checks [--checkcnt];
2936 ev_active (checks [active - 1]) = active;
2937 }
2938
2939 ev_stop (EV_A_ (W)w);
2940
2941 EV_FREQUENT_CHECK;
2942}
2943
2944#if EV_EMBED_ENABLE
2945void noinline
2946ev_embed_sweep (EV_P_ ev_embed *w)
2947{
2948 ev_loop (w->other, EVLOOP_NONBLOCK);
408} 2949}
409 2950
410static void 2951static void
411ev_stop (struct ev_watcher *w) 2952embed_io_cb (EV_P_ ev_io *io, int revents)
412{ 2953{
413 if (w->pending) 2954 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
414 pendings [w->pending - 1].w = 0;
415 2955
416 w->active = 0;
417 /* nop */
418}
419
420void
421evio_start (struct ev_io *w)
422{
423 if (ev_is_active (w)) 2956 if (ev_cb (w))
2957 ev_feed_event (EV_A_ (W)w, EV_EMBED);
2958 else
2959 ev_loop (w->other, EVLOOP_NONBLOCK);
2960}
2961
2962static void
2963embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
2964{
2965 ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
2966
2967 {
2968 struct ev_loop *loop = w->other;
2969
2970 while (fdchangecnt)
2971 {
2972 fd_reify (EV_A);
2973 ev_loop (EV_A_ EVLOOP_NONBLOCK);
2974 }
2975 }
2976}
2977
2978static void
2979embed_fork_cb (EV_P_ ev_fork *fork_w, int revents)
2980{
2981 ev_embed *w = (ev_embed *)(((char *)fork_w) - offsetof (ev_embed, fork));
2982
2983 ev_embed_stop (EV_A_ w);
2984
2985 {
2986 struct ev_loop *loop = w->other;
2987
2988 ev_loop_fork (EV_A);
2989 ev_loop (EV_A_ EVLOOP_NONBLOCK);
2990 }
2991
2992 ev_embed_start (EV_A_ w);
2993}
2994
2995#if 0
2996static void
2997embed_idle_cb (EV_P_ ev_idle *idle, int revents)
2998{
2999 ev_idle_stop (EV_A_ idle);
3000}
3001#endif
3002
3003void
3004ev_embed_start (EV_P_ ev_embed *w)
3005{
3006 if (expect_false (ev_is_active (w)))
424 return; 3007 return;
425 3008
426 int fd = w->fd; 3009 {
3010 struct ev_loop *loop = w->other;
3011 assert (("libev: loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
3012 ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
3013 }
427 3014
428 ev_start ((struct ev_watcher *)w, 1); 3015 EV_FREQUENT_CHECK;
429 array_needsize (anfds, anfdmax, fd + 1, anfds_init);
430 wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w);
431 3016
432 ++fdchangecnt; 3017 ev_set_priority (&w->io, ev_priority (w));
433 array_needsize (fdchanges, fdchangemax, fdchangecnt, ); 3018 ev_io_start (EV_A_ &w->io);
434 fdchanges [fdchangecnt - 1] = fd;
435}
436 3019
3020 ev_prepare_init (&w->prepare, embed_prepare_cb);
3021 ev_set_priority (&w->prepare, EV_MINPRI);
3022 ev_prepare_start (EV_A_ &w->prepare);
3023
3024 ev_fork_init (&w->fork, embed_fork_cb);
3025 ev_fork_start (EV_A_ &w->fork);
3026
3027 /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
3028
3029 ev_start (EV_A_ (W)w, 1);
3030
3031 EV_FREQUENT_CHECK;
3032}
3033
437void 3034void
438evio_stop (struct ev_io *w) 3035ev_embed_stop (EV_P_ ev_embed *w)
439{ 3036{
3037 clear_pending (EV_A_ (W)w);
440 if (!ev_is_active (w)) 3038 if (expect_false (!ev_is_active (w)))
441 return; 3039 return;
442 3040
443 wlist_del ((struct ev_watcher_list **)&anfds[w->fd].head, (struct ev_watcher_list *)w); 3041 EV_FREQUENT_CHECK;
444 ev_stop ((struct ev_watcher *)w);
445 3042
446 ++fdchangecnt; 3043 ev_io_stop (EV_A_ &w->io);
447 array_needsize (fdchanges, fdchangemax, fdchangecnt, ); 3044 ev_prepare_stop (EV_A_ &w->prepare);
448 fdchanges [fdchangecnt - 1] = w->fd; 3045 ev_fork_stop (EV_A_ &w->fork);
449}
450 3046
3047 EV_FREQUENT_CHECK;
3048}
3049#endif
3050
3051#if EV_FORK_ENABLE
451void 3052void
452evtimer_start (struct ev_timer *w) 3053ev_fork_start (EV_P_ ev_fork *w)
453{ 3054{
454 if (ev_is_active (w)) 3055 if (expect_false (ev_is_active (w)))
455 return; 3056 return;
456 3057
457 if (w->is_abs) 3058 EV_FREQUENT_CHECK;
458 {
459 /* this formula differs from the one in timer_reify becuse we do not round up */
460 if (w->repeat)
461 w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;
462 3059
463 ev_start ((struct ev_watcher *)w, ++atimercnt); 3060 ev_start (EV_A_ (W)w, ++forkcnt);
464 array_needsize (atimers, atimermax, atimercnt, ); 3061 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
465 atimers [atimercnt - 1] = w; 3062 forks [forkcnt - 1] = w;
466 upheap (atimers, atimercnt - 1);
467 }
468 else
469 {
470 w->at += now;
471 3063
472 ev_start ((struct ev_watcher *)w, ++rtimercnt); 3064 EV_FREQUENT_CHECK;
473 array_needsize (rtimers, rtimermax, rtimercnt, );
474 rtimers [rtimercnt - 1] = w;
475 upheap (rtimers, rtimercnt - 1);
476 }
477
478} 3065}
479 3066
480void 3067void
481evtimer_stop (struct ev_timer *w) 3068ev_fork_stop (EV_P_ ev_fork *w)
482{ 3069{
3070 clear_pending (EV_A_ (W)w);
483 if (!ev_is_active (w)) 3071 if (expect_false (!ev_is_active (w)))
484 return; 3072 return;
485 3073
486 if (w->is_abs) 3074 EV_FREQUENT_CHECK;
3075
3076 {
3077 int active = ev_active (w);
3078
3079 forks [active - 1] = forks [--forkcnt];
3080 ev_active (forks [active - 1]) = active;
3081 }
3082
3083 ev_stop (EV_A_ (W)w);
3084
3085 EV_FREQUENT_CHECK;
3086}
3087#endif
3088
3089#if EV_ASYNC_ENABLE
3090void
3091ev_async_start (EV_P_ ev_async *w)
3092{
3093 if (expect_false (ev_is_active (w)))
3094 return;
3095
3096 evpipe_init (EV_A);
3097
3098 EV_FREQUENT_CHECK;
3099
3100 ev_start (EV_A_ (W)w, ++asynccnt);
3101 array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
3102 asyncs [asynccnt - 1] = w;
3103
3104 EV_FREQUENT_CHECK;
3105}
3106
3107void
3108ev_async_stop (EV_P_ ev_async *w)
3109{
3110 clear_pending (EV_A_ (W)w);
3111 if (expect_false (!ev_is_active (w)))
3112 return;
3113
3114 EV_FREQUENT_CHECK;
3115
3116 {
3117 int active = ev_active (w);
3118
3119 asyncs [active - 1] = asyncs [--asynccnt];
3120 ev_active (asyncs [active - 1]) = active;
3121 }
3122
3123 ev_stop (EV_A_ (W)w);
3124
3125 EV_FREQUENT_CHECK;
3126}
3127
3128void
3129ev_async_send (EV_P_ ev_async *w)
3130{
3131 w->sent = 1;
3132 evpipe_write (EV_A_ &gotasync);
3133}
3134#endif
3135
3136/*****************************************************************************/
3137
3138struct ev_once
3139{
3140 ev_io io;
3141 ev_timer to;
3142 void (*cb)(int revents, void *arg);
3143 void *arg;
3144};
3145
3146static void
3147once_cb (EV_P_ struct ev_once *once, int revents)
3148{
3149 void (*cb)(int revents, void *arg) = once->cb;
3150 void *arg = once->arg;
3151
3152 ev_io_stop (EV_A_ &once->io);
3153 ev_timer_stop (EV_A_ &once->to);
3154 ev_free (once);
3155
3156 cb (revents, arg);
3157}
3158
3159static void
3160once_cb_io (EV_P_ ev_io *w, int revents)
3161{
3162 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io));
3163
3164 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->to));
3165}
3166
3167static void
3168once_cb_to (EV_P_ ev_timer *w, int revents)
3169{
3170 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to));
3171
3172 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->io));
3173}
3174
3175void
3176ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
3177{
3178 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
3179
3180 if (expect_false (!once))
3181 {
3182 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
3183 return;
487 { 3184 }
488 if (w->active < atimercnt--) 3185
3186 once->cb = cb;
3187 once->arg = arg;
3188
3189 ev_init (&once->io, once_cb_io);
3190 if (fd >= 0)
3191 {
3192 ev_io_set (&once->io, fd, events);
3193 ev_io_start (EV_A_ &once->io);
3194 }
3195
3196 ev_init (&once->to, once_cb_to);
3197 if (timeout >= 0.)
3198 {
3199 ev_timer_set (&once->to, timeout, 0.);
3200 ev_timer_start (EV_A_ &once->to);
3201 }
3202}
3203
3204/*****************************************************************************/
3205
3206#if 0
3207void
3208ev_walk (EV_P_ int types, void (*cb)(EV_P_ int type, void *w))
3209{
3210 int i, j;
3211 ev_watcher_list *wl, *wn;
3212
3213 if (types & (EV_IO | EV_EMBED))
3214 for (i = 0; i < anfdmax; ++i)
3215 for (wl = anfds [i].head; wl; )
489 { 3216 {
490 atimers [w->active - 1] = atimers [atimercnt]; 3217 wn = wl->next;
491 downheap (atimers, atimercnt, w->active - 1); 3218
3219#if EV_EMBED_ENABLE
3220 if (ev_cb ((ev_io *)wl) == embed_io_cb)
3221 {
3222 if (types & EV_EMBED)
3223 cb (EV_A_ EV_EMBED, ((char *)wl) - offsetof (struct ev_embed, io));
3224 }
3225 else
3226#endif
3227#if EV_USE_INOTIFY
3228 if (ev_cb ((ev_io *)wl) == infy_cb)
3229 ;
3230 else
3231#endif
3232 if ((ev_io *)wl != &pipeev)
3233 if (types & EV_IO)
3234 cb (EV_A_ EV_IO, wl);
3235
3236 wl = wn;
492 } 3237 }
493 } 3238
494 else 3239 if (types & (EV_TIMER | EV_STAT))
495 { 3240 for (i = timercnt + HEAP0; i-- > HEAP0; )
496 if (w->active < rtimercnt--) 3241#if EV_STAT_ENABLE
3242 /*TODO: timer is not always active*/
3243 if (ev_cb ((ev_timer *)ANHE_w (timers [i])) == stat_timer_cb)
497 { 3244 {
498 rtimers [w->active - 1] = rtimers [rtimercnt]; 3245 if (types & EV_STAT)
499 downheap (rtimers, rtimercnt, w->active - 1); 3246 cb (EV_A_ EV_STAT, ((char *)ANHE_w (timers [i])) - offsetof (struct ev_stat, timer));
500 } 3247 }
501 } 3248 else
3249#endif
3250 if (types & EV_TIMER)
3251 cb (EV_A_ EV_TIMER, ANHE_w (timers [i]));
502 3252
503 ev_stop ((struct ev_watcher *)w); 3253#if EV_PERIODIC_ENABLE
504} 3254 if (types & EV_PERIODIC)
3255 for (i = periodiccnt + HEAP0; i-- > HEAP0; )
3256 cb (EV_A_ EV_PERIODIC, ANHE_w (periodics [i]));
3257#endif
505 3258
506void 3259#if EV_IDLE_ENABLE
507evsignal_start (struct ev_signal *w) 3260 if (types & EV_IDLE)
508{ 3261 for (j = NUMPRI; i--; )
509 if (ev_is_active (w)) 3262 for (i = idlecnt [j]; i--; )
510 return; 3263 cb (EV_A_ EV_IDLE, idles [j][i]);
3264#endif
511 3265
512 ev_start ((struct ev_watcher *)w, 1); 3266#if EV_FORK_ENABLE
513 array_needsize (signals, signalmax, w->signum, signals_init); 3267 if (types & EV_FORK)
514 wlist_add ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w); 3268 for (i = forkcnt; i--; )
515} 3269 if (ev_cb (forks [i]) != embed_fork_cb)
3270 cb (EV_A_ EV_FORK, forks [i]);
3271#endif
516 3272
517void 3273#if EV_ASYNC_ENABLE
518evsignal_stop (struct ev_signal *w) 3274 if (types & EV_ASYNC)
519{ 3275 for (i = asynccnt; i--; )
520 if (!ev_is_active (w)) 3276 cb (EV_A_ EV_ASYNC, asyncs [i]);
521 return; 3277#endif
522 3278
523 wlist_del ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w); 3279 if (types & EV_PREPARE)
524 ev_stop ((struct ev_watcher *)w); 3280 for (i = preparecnt; i--; )
525} 3281#if EV_EMBED_ENABLE
3282 if (ev_cb (prepares [i]) != embed_prepare_cb)
3283#endif
3284 cb (EV_A_ EV_PREPARE, prepares [i]);
526 3285
527/*****************************************************************************/ 3286 if (types & EV_CHECK)
528#if 1 3287 for (i = checkcnt; i--; )
3288 cb (EV_A_ EV_CHECK, checks [i]);
529 3289
530static void 3290 if (types & EV_SIGNAL)
531sin_cb (struct ev_io *w, int revents)
532{
533 fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
534}
535
536static void
537ocb (struct ev_timer *w, int revents)
538{
539 //fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
540 evtimer_stop (w);
541 evtimer_start (w);
542}
543
544int main (void)
545{
546 struct ev_io sin;
547
548 ev_init (0);
549
550 evw_init (&sin, sin_cb, 55);
551 evio_set (&sin, 0, EV_READ);
552 evio_start (&sin);
553
554 struct ev_timer t[10000];
555
556#if 1
557 int i;
558 for (i = 0; i < 10000; ++i) 3291 for (i = 0; i < signalmax; ++i)
559 { 3292 for (wl = signals [i].head; wl; )
560 struct ev_timer *w = t + i; 3293 {
561 evw_init (w, ocb, i); 3294 wn = wl->next;
562 evtimer_set_abs (w, drand48 (), 0.99775533); 3295 cb (EV_A_ EV_SIGNAL, wl);
563 evtimer_start (w); 3296 wl = wn;
564 if (drand48 () < 0.5) 3297 }
565 evtimer_stop (w);
566 }
567#endif
568 3298
569 struct ev_timer t1; 3299 if (types & EV_CHILD)
570 evw_init (&t1, ocb, 0); 3300 for (i = EV_PID_HASHSIZE; i--; )
571 evtimer_set_abs (&t1, 5, 10); 3301 for (wl = childs [i]; wl; )
572 evtimer_start (&t1); 3302 {
573 3303 wn = wl->next;
574 ev_loop (0); 3304 cb (EV_A_ EV_CHILD, wl);
575 3305 wl = wn;
576 return 0; 3306 }
3307/* EV_STAT 0x00001000 /* stat data changed */
3308/* EV_EMBED 0x00010000 /* embedded event loop needs sweep */
577} 3309}
578
579#endif 3310#endif
580 3311
3312#if EV_MULTIPLICITY
3313 #include "ev_wrap.h"
3314#endif
581 3315
3316#ifdef __cplusplus
3317}
3318#endif
582 3319
583

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