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Comparing libev/ev.c (file contents):
Revision 1.7 by root, Wed Oct 31 00:24:16 2007 UTC vs.
Revision 1.278 by root, Tue Jan 6 19:46:56 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 1
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>
3#include <unistd.h>
4#include <fcntl.h> 148#include <fcntl.h>
5#include <signal.h> 149#include <stddef.h>
6 150
7#include <stdio.h> 151#include <stdio.h>
8 152
9#include <assert.h> 153#include <assert.h>
10#include <errno.h> 154#include <errno.h>
11#include <sys/time.h> 155#include <sys/types.h>
12#include <time.h> 156#include <time.h>
13 157
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 0
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
14#ifdef CLOCK_MONOTONIC 289#ifndef CLOCK_MONOTONIC
290# undef EV_USE_MONOTONIC
15# 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>
16#endif 307# endif
308#endif
17 309
18#define HAVE_REALTIME 1 310#if EV_USE_INOTIFY
19#define HAVE_EPOLL 1 311# include <sys/utsname.h>
20#define HAVE_SELECT 1 312# 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 */
21 363
22#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) */
23#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 */
24 367
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_MONOTONIC
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_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
406#endif
407
408#ifdef _WIN32
409# include "ev_win32.c"
410#endif
411
412/*****************************************************************************/
413
414static void (*syserr_cb)(const char *msg);
415
416void
417ev_set_syserr_cb (void (*cb)(const char *msg))
418{
419 syserr_cb = cb;
420}
421
422static void noinline
423ev_syserr (const char *msg)
424{
425 if (!msg)
426 msg = "(libev) system error";
427
428 if (syserr_cb)
429 syserr_cb (msg);
430 else
431 {
432 perror (msg);
433 abort ();
434 }
435}
436
437static void *
438ev_realloc_emul (void *ptr, long size)
439{
440 /* some systems, notably openbsd and darwin, fail to properly
441 * implement realloc (x, 0) (as required by both ansi c-98 and
442 * the single unix specification, so work around them here.
443 */
444
445 if (size)
446 return realloc (ptr, size);
447
448 free (ptr);
449 return 0;
450}
451
452static void *(*alloc)(void *ptr, long size) = ev_realloc_emul;
453
454void
455ev_set_allocator (void *(*cb)(void *ptr, long size))
456{
457 alloc = cb;
458}
459
460inline_speed void *
461ev_realloc (void *ptr, long size)
462{
463 ptr = alloc (ptr, size);
464
465 if (!ptr && size)
466 {
467 fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
468 abort ();
469 }
470
471 return ptr;
472}
473
474#define ev_malloc(size) ev_realloc (0, (size))
475#define ev_free(ptr) ev_realloc ((ptr), 0)
476
477/*****************************************************************************/
478
479typedef struct
480{
481 WL head;
482 unsigned char events;
483 unsigned char reify;
484 unsigned char emask; /* the epoll backend stores the actual kernel mask in here */
485 unsigned char unused;
486#if EV_USE_EPOLL
487 unsigned int egen; /* generation counter to counter epoll bugs */
488#endif
489#if EV_SELECT_IS_WINSOCKET
490 SOCKET handle;
491#endif
492} ANFD;
493
494typedef struct
495{
496 W w;
497 int events;
498} ANPENDING;
499
500#if EV_USE_INOTIFY
501/* hash table entry per inotify-id */
502typedef struct
503{
504 WL head;
505} ANFS;
506#endif
507
508/* Heap Entry */
509#if EV_HEAP_CACHE_AT
510 typedef struct {
511 ev_tstamp at;
512 WT w;
513 } ANHE;
514
515 #define ANHE_w(he) (he).w /* access watcher, read-write */
516 #define ANHE_at(he) (he).at /* access cached at, read-only */
517 #define ANHE_at_cache(he) (he).at = (he).w->at /* update at from watcher */
518#else
519 typedef WT ANHE;
520
521 #define ANHE_w(he) (he)
522 #define ANHE_at(he) (he)->at
523 #define ANHE_at_cache(he)
524#endif
525
526#if EV_MULTIPLICITY
527
528 struct ev_loop
529 {
530 ev_tstamp ev_rt_now;
531 #define ev_rt_now ((loop)->ev_rt_now)
532 #define VAR(name,decl) decl;
533 #include "ev_vars.h"
534 #undef VAR
535 };
25#include "ev.h" 536 #include "ev_wrap.h"
26 537
27struct ev_watcher { 538 static struct ev_loop default_loop_struct;
28 EV_WATCHER (ev_watcher); 539 struct ev_loop *ev_default_loop_ptr;
29};
30 540
31struct ev_watcher_list { 541#else
32 EV_WATCHER_LIST (ev_watcher_list);
33};
34 542
35static ev_tstamp now, diff; /* monotonic clock */
36ev_tstamp ev_now; 543 ev_tstamp ev_rt_now;
37int ev_method; 544 #define VAR(name,decl) static decl;
545 #include "ev_vars.h"
546 #undef VAR
38 547
39static int have_monotonic; /* runtime */ 548 static int ev_default_loop_ptr;
40 549
41static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */ 550#endif
42static void (*method_modify)(int fd, int oev, int nev); 551
43static void (*method_poll)(ev_tstamp timeout); 552/*****************************************************************************/
44 553
45ev_tstamp 554ev_tstamp
46ev_time (void) 555ev_time (void)
47{ 556{
48#if HAVE_REALTIME 557#if EV_USE_REALTIME
49 struct timespec ts; 558 struct timespec ts;
50 clock_gettime (CLOCK_REALTIME, &ts); 559 clock_gettime (CLOCK_REALTIME, &ts);
51 return ts.tv_sec + ts.tv_nsec * 1e-9; 560 return ts.tv_sec + ts.tv_nsec * 1e-9;
52#else 561#else
53 struct timeval tv; 562 struct timeval tv;
54 gettimeofday (&tv, 0); 563 gettimeofday (&tv, 0);
55 return tv.tv_sec + tv.tv_usec * 1e-6; 564 return tv.tv_sec + tv.tv_usec * 1e-6;
56#endif 565#endif
57} 566}
58 567
59static ev_tstamp 568ev_tstamp inline_size
60get_clock (void) 569get_clock (void)
61{ 570{
62#if HAVE_MONOTONIC 571#if EV_USE_MONOTONIC
63 if (have_monotonic) 572 if (expect_true (have_monotonic))
64 { 573 {
65 struct timespec ts; 574 struct timespec ts;
66 clock_gettime (CLOCK_MONOTONIC, &ts); 575 clock_gettime (CLOCK_MONOTONIC, &ts);
67 return ts.tv_sec + ts.tv_nsec * 1e-9; 576 return ts.tv_sec + ts.tv_nsec * 1e-9;
68 } 577 }
69#endif 578#endif
70 579
71 return ev_time (); 580 return ev_time ();
72} 581}
73 582
583#if EV_MULTIPLICITY
584ev_tstamp
585ev_now (EV_P)
586{
587 return ev_rt_now;
588}
589#endif
590
591void
592ev_sleep (ev_tstamp delay)
593{
594 if (delay > 0.)
595 {
596#if EV_USE_NANOSLEEP
597 struct timespec ts;
598
599 ts.tv_sec = (time_t)delay;
600 ts.tv_nsec = (long)((delay - (ev_tstamp)(ts.tv_sec)) * 1e9);
601
602 nanosleep (&ts, 0);
603#elif defined(_WIN32)
604 Sleep ((unsigned long)(delay * 1e3));
605#else
606 struct timeval tv;
607
608 tv.tv_sec = (time_t)delay;
609 tv.tv_usec = (long)((delay - (ev_tstamp)(tv.tv_sec)) * 1e6);
610
611 /* here we rely on sys/time.h + sys/types.h + unistd.h providing select */
612 /* somehting nto guaranteed by newer posix versions, but guaranteed */
613 /* by older ones */
614 select (0, 0, 0, 0, &tv);
615#endif
616 }
617}
618
619/*****************************************************************************/
620
621#define MALLOC_ROUND 4096 /* prefer to allocate in chunks of this size, must be 2**n and >> 4 longs */
622
623int inline_size
624array_nextsize (int elem, int cur, int cnt)
625{
626 int ncur = cur + 1;
627
628 do
629 ncur <<= 1;
630 while (cnt > ncur);
631
632 /* if size is large, round to MALLOC_ROUND - 4 * longs to accomodate malloc overhead */
633 if (elem * ncur > MALLOC_ROUND - sizeof (void *) * 4)
634 {
635 ncur *= elem;
636 ncur = (ncur + elem + (MALLOC_ROUND - 1) + sizeof (void *) * 4) & ~(MALLOC_ROUND - 1);
637 ncur = ncur - sizeof (void *) * 4;
638 ncur /= elem;
639 }
640
641 return ncur;
642}
643
644static noinline void *
645array_realloc (int elem, void *base, int *cur, int cnt)
646{
647 *cur = array_nextsize (elem, *cur, cnt);
648 return ev_realloc (base, elem * *cur);
649}
650
651#define array_init_zero(base,count) \
652 memset ((void *)(base), 0, sizeof (*(base)) * (count))
653
74#define array_needsize(base,cur,cnt,init) \ 654#define array_needsize(type,base,cur,cnt,init) \
75 if ((cnt) > cur) \ 655 if (expect_false ((cnt) > (cur))) \
76 { \ 656 { \
77 int newcnt = cur ? cur << 1 : 16; \ 657 int ocur_ = (cur); \
78 fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\ 658 (base) = (type *)array_realloc \
79 base = realloc (base, sizeof (*base) * (newcnt)); \ 659 (sizeof (type), (base), &(cur), (cnt)); \
80 init (base + cur, newcnt - cur); \ 660 init ((base) + (ocur_), (cur) - ocur_); \
81 cur = newcnt; \ 661 }
662
663#if 0
664#define array_slim(type,stem) \
665 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
666 { \
667 stem ## max = array_roundsize (stem ## cnt >> 1); \
668 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
669 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
670 }
671#endif
672
673#define array_free(stem, idx) \
674 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
675
676/*****************************************************************************/
677
678void noinline
679ev_feed_event (EV_P_ void *w, int revents)
680{
681 W w_ = (W)w;
682 int pri = ABSPRI (w_);
683
684 if (expect_false (w_->pending))
685 pendings [pri][w_->pending - 1].events |= revents;
686 else
687 {
688 w_->pending = ++pendingcnt [pri];
689 array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
690 pendings [pri][w_->pending - 1].w = w_;
691 pendings [pri][w_->pending - 1].events = revents;
692 }
693}
694
695void inline_speed
696queue_events (EV_P_ W *events, int eventcnt, int type)
697{
698 int i;
699
700 for (i = 0; i < eventcnt; ++i)
701 ev_feed_event (EV_A_ events [i], type);
702}
703
704/*****************************************************************************/
705
706void inline_speed
707fd_event (EV_P_ int fd, int revents)
708{
709 ANFD *anfd = anfds + fd;
710 ev_io *w;
711
712 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
713 {
714 int ev = w->events & revents;
715
716 if (ev)
717 ev_feed_event (EV_A_ (W)w, ev);
718 }
719}
720
721void
722ev_feed_fd_event (EV_P_ int fd, int revents)
723{
724 if (fd >= 0 && fd < anfdmax)
725 fd_event (EV_A_ fd, revents);
726}
727
728void inline_size
729fd_reify (EV_P)
730{
731 int i;
732
733 for (i = 0; i < fdchangecnt; ++i)
734 {
735 int fd = fdchanges [i];
736 ANFD *anfd = anfds + fd;
737 ev_io *w;
738
739 unsigned char events = 0;
740
741 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
742 events |= (unsigned char)w->events;
743
744#if EV_SELECT_IS_WINSOCKET
745 if (events)
746 {
747 unsigned long arg;
748 #ifdef EV_FD_TO_WIN32_HANDLE
749 anfd->handle = EV_FD_TO_WIN32_HANDLE (fd);
750 #else
751 anfd->handle = _get_osfhandle (fd);
752 #endif
753 assert (("libev: only socket fds supported in this configuration", ioctlsocket (anfd->handle, FIONREAD, &arg) == 0));
754 }
755#endif
756
757 {
758 unsigned char o_events = anfd->events;
759 unsigned char o_reify = anfd->reify;
760
761 anfd->reify = 0;
762 anfd->events = events;
763
764 if (o_events != events || o_reify & EV_IOFDSET)
765 backend_modify (EV_A_ fd, o_events, events);
82 } 766 }
767 }
768
769 fdchangecnt = 0;
770}
771
772void inline_size
773fd_change (EV_P_ int fd, int flags)
774{
775 unsigned char reify = anfds [fd].reify;
776 anfds [fd].reify |= flags;
777
778 if (expect_true (!reify))
779 {
780 ++fdchangecnt;
781 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
782 fdchanges [fdchangecnt - 1] = fd;
783 }
784}
785
786void inline_speed
787fd_kill (EV_P_ int fd)
788{
789 ev_io *w;
790
791 while ((w = (ev_io *)anfds [fd].head))
792 {
793 ev_io_stop (EV_A_ w);
794 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
795 }
796}
797
798int inline_size
799fd_valid (int fd)
800{
801#ifdef _WIN32
802 return _get_osfhandle (fd) != -1;
803#else
804 return fcntl (fd, F_GETFD) != -1;
805#endif
806}
807
808/* called on EBADF to verify fds */
809static void noinline
810fd_ebadf (EV_P)
811{
812 int fd;
813
814 for (fd = 0; fd < anfdmax; ++fd)
815 if (anfds [fd].events)
816 if (!fd_valid (fd) && errno == EBADF)
817 fd_kill (EV_A_ fd);
818}
819
820/* called on ENOMEM in select/poll to kill some fds and retry */
821static void noinline
822fd_enomem (EV_P)
823{
824 int fd;
825
826 for (fd = anfdmax; fd--; )
827 if (anfds [fd].events)
828 {
829 fd_kill (EV_A_ fd);
830 return;
831 }
832}
833
834/* usually called after fork if backend needs to re-arm all fds from scratch */
835static void noinline
836fd_rearm_all (EV_P)
837{
838 int fd;
839
840 for (fd = 0; fd < anfdmax; ++fd)
841 if (anfds [fd].events)
842 {
843 anfds [fd].events = 0;
844 anfds [fd].emask = 0;
845 fd_change (EV_A_ fd, EV_IOFDSET | 1);
846 }
847}
848
849/*****************************************************************************/
850
851/*
852 * the heap functions want a real array index. array index 0 uis guaranteed to not
853 * be in-use at any time. the first heap entry is at array [HEAP0]. DHEAP gives
854 * the branching factor of the d-tree.
855 */
856
857/*
858 * at the moment we allow libev the luxury of two heaps,
859 * a small-code-size 2-heap one and a ~1.5kb larger 4-heap
860 * which is more cache-efficient.
861 * the difference is about 5% with 50000+ watchers.
862 */
863#if EV_USE_4HEAP
864
865#define DHEAP 4
866#define HEAP0 (DHEAP - 1) /* index of first element in heap */
867#define HPARENT(k) ((((k) - HEAP0 - 1) / DHEAP) + HEAP0)
868#define UPHEAP_DONE(p,k) ((p) == (k))
869
870/* away from the root */
871void inline_speed
872downheap (ANHE *heap, int N, int k)
873{
874 ANHE he = heap [k];
875 ANHE *E = heap + N + HEAP0;
876
877 for (;;)
878 {
879 ev_tstamp minat;
880 ANHE *minpos;
881 ANHE *pos = heap + DHEAP * (k - HEAP0) + HEAP0 + 1;
882
883 /* find minimum child */
884 if (expect_true (pos + DHEAP - 1 < E))
885 {
886 /* fast path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
887 if ( ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
888 if ( ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
889 if ( ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
890 }
891 else if (pos < E)
892 {
893 /* slow path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
894 if (pos + 1 < E && ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
895 if (pos + 2 < E && ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
896 if (pos + 3 < E && ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
897 }
898 else
899 break;
900
901 if (ANHE_at (he) <= minat)
902 break;
903
904 heap [k] = *minpos;
905 ev_active (ANHE_w (*minpos)) = k;
906
907 k = minpos - heap;
908 }
909
910 heap [k] = he;
911 ev_active (ANHE_w (he)) = k;
912}
913
914#else /* 4HEAP */
915
916#define HEAP0 1
917#define HPARENT(k) ((k) >> 1)
918#define UPHEAP_DONE(p,k) (!(p))
919
920/* away from the root */
921void inline_speed
922downheap (ANHE *heap, int N, int k)
923{
924 ANHE he = heap [k];
925
926 for (;;)
927 {
928 int c = k << 1;
929
930 if (c > N + HEAP0 - 1)
931 break;
932
933 c += c + 1 < N + HEAP0 && ANHE_at (heap [c]) > ANHE_at (heap [c + 1])
934 ? 1 : 0;
935
936 if (ANHE_at (he) <= ANHE_at (heap [c]))
937 break;
938
939 heap [k] = heap [c];
940 ev_active (ANHE_w (heap [k])) = k;
941
942 k = c;
943 }
944
945 heap [k] = he;
946 ev_active (ANHE_w (he)) = k;
947}
948#endif
949
950/* towards the root */
951void inline_speed
952upheap (ANHE *heap, int k)
953{
954 ANHE he = heap [k];
955
956 for (;;)
957 {
958 int p = HPARENT (k);
959
960 if (UPHEAP_DONE (p, k) || ANHE_at (heap [p]) <= ANHE_at (he))
961 break;
962
963 heap [k] = heap [p];
964 ev_active (ANHE_w (heap [k])) = k;
965 k = p;
966 }
967
968 heap [k] = he;
969 ev_active (ANHE_w (he)) = k;
970}
971
972void inline_size
973adjustheap (ANHE *heap, int N, int k)
974{
975 if (k > HEAP0 && ANHE_at (heap [HPARENT (k)]) >= ANHE_at (heap [k]))
976 upheap (heap, k);
977 else
978 downheap (heap, N, k);
979}
980
981/* rebuild the heap: this function is used only once and executed rarely */
982void inline_size
983reheap (ANHE *heap, int N)
984{
985 int i;
986
987 /* we don't use floyds algorithm, upheap is simpler and is more cache-efficient */
988 /* also, this is easy to implement and correct for both 2-heaps and 4-heaps */
989 for (i = 0; i < N; ++i)
990 upheap (heap, i + HEAP0);
991}
992
993/*****************************************************************************/
83 994
84typedef struct 995typedef struct
85{ 996{
86 struct ev_io *head; 997 WL head;
87 unsigned char wev, rev; /* want, received event set */ 998 EV_ATOMIC_T gotsig;
88} ANFD;
89
90static ANFD *anfds;
91static int anfdmax;
92
93static int *fdchanges;
94static int fdchangemax, fdchangecnt;
95
96static void
97anfds_init (ANFD *base, int count)
98{
99 while (count--)
100 {
101 base->head = 0;
102 base->wev = base->rev = EV_NONE;
103 ++base;
104 }
105}
106
107typedef struct
108{
109 struct ev_watcher *w;
110 int events;
111} ANPENDING;
112
113static ANPENDING *pendings;
114static int pendingmax, pendingcnt;
115
116static void
117event (struct ev_watcher *w, int events)
118{
119 w->pending = ++pendingcnt;
120 array_needsize (pendings, pendingmax, pendingcnt, );
121 pendings [pendingcnt - 1].w = w;
122 pendings [pendingcnt - 1].events = events;
123}
124
125static void
126fd_event (int fd, int events)
127{
128 ANFD *anfd = anfds + fd;
129 struct ev_io *w;
130
131 for (w = anfd->head; w; w = w->next)
132 {
133 int ev = w->events & events;
134
135 if (ev)
136 event ((struct ev_watcher *)w, ev);
137 }
138}
139
140static struct ev_timer **atimers;
141static int atimermax, atimercnt;
142
143static struct ev_timer **rtimers;
144static int rtimermax, rtimercnt;
145
146static void
147upheap (struct ev_timer **timers, int k)
148{
149 struct ev_timer *w = timers [k];
150
151 while (k && timers [k >> 1]->at > w->at)
152 {
153 timers [k] = timers [k >> 1];
154 timers [k]->active = k + 1;
155 k >>= 1;
156 }
157
158 timers [k] = w;
159 timers [k]->active = k + 1;
160
161}
162
163static void
164downheap (struct ev_timer **timers, int N, int k)
165{
166 struct ev_timer *w = timers [k];
167
168 while (k < (N >> 1))
169 {
170 int j = k << 1;
171
172 if (j + 1 < N && timers [j]->at > timers [j + 1]->at)
173 ++j;
174
175 if (w->at <= timers [j]->at)
176 break;
177
178 timers [k] = timers [j];
179 timers [k]->active = k + 1;
180 k = j;
181 }
182
183 timers [k] = w;
184 timers [k]->active = k + 1;
185}
186
187typedef struct
188{
189 struct ev_signal *head;
190 sig_atomic_t gotsig;
191} ANSIG; 999} ANSIG;
192 1000
193static ANSIG *signals; 1001static ANSIG *signals;
194static int signalmax; 1002static int signalmax;
195 1003
196static int sigpipe [2]; 1004static EV_ATOMIC_T gotsig;
197static sig_atomic_t gotsig; 1005
198static struct ev_io sigev; 1006/*****************************************************************************/
1007
1008void inline_speed
1009fd_intern (int fd)
1010{
1011#ifdef _WIN32
1012 unsigned long arg = 1;
1013 ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
1014#else
1015 fcntl (fd, F_SETFD, FD_CLOEXEC);
1016 fcntl (fd, F_SETFL, O_NONBLOCK);
1017#endif
1018}
1019
1020static void noinline
1021evpipe_init (EV_P)
1022{
1023 if (!ev_is_active (&pipeev))
1024 {
1025#if EV_USE_EVENTFD
1026 if ((evfd = eventfd (0, 0)) >= 0)
1027 {
1028 evpipe [0] = -1;
1029 fd_intern (evfd);
1030 ev_io_set (&pipeev, evfd, EV_READ);
1031 }
1032 else
1033#endif
1034 {
1035 while (pipe (evpipe))
1036 ev_syserr ("(libev) error creating signal/async pipe");
1037
1038 fd_intern (evpipe [0]);
1039 fd_intern (evpipe [1]);
1040 ev_io_set (&pipeev, evpipe [0], EV_READ);
1041 }
1042
1043 ev_io_start (EV_A_ &pipeev);
1044 ev_unref (EV_A); /* watcher should not keep loop alive */
1045 }
1046}
1047
1048void inline_size
1049evpipe_write (EV_P_ EV_ATOMIC_T *flag)
1050{
1051 if (!*flag)
1052 {
1053 int old_errno = errno; /* save errno because write might clobber it */
1054
1055 *flag = 1;
1056
1057#if EV_USE_EVENTFD
1058 if (evfd >= 0)
1059 {
1060 uint64_t counter = 1;
1061 write (evfd, &counter, sizeof (uint64_t));
1062 }
1063 else
1064#endif
1065 write (evpipe [1], &old_errno, 1);
1066
1067 errno = old_errno;
1068 }
1069}
199 1070
200static void 1071static void
201signals_init (ANSIG *base, int count) 1072pipecb (EV_P_ ev_io *iow, int revents)
202{ 1073{
203 while (count--) 1074#if EV_USE_EVENTFD
1075 if (evfd >= 0)
1076 {
1077 uint64_t counter;
1078 read (evfd, &counter, sizeof (uint64_t));
204 { 1079 }
205 base->head = 0; 1080 else
1081#endif
1082 {
1083 char dummy;
1084 read (evpipe [0], &dummy, 1);
1085 }
1086
1087 if (gotsig && ev_is_default_loop (EV_A))
1088 {
1089 int signum;
206 base->gotsig = 0; 1090 gotsig = 0;
207 ++base; 1091
1092 for (signum = signalmax; signum--; )
1093 if (signals [signum].gotsig)
1094 ev_feed_signal_event (EV_A_ signum + 1);
1095 }
1096
1097#if EV_ASYNC_ENABLE
1098 if (gotasync)
208 } 1099 {
1100 int i;
1101 gotasync = 0;
1102
1103 for (i = asynccnt; i--; )
1104 if (asyncs [i]->sent)
1105 {
1106 asyncs [i]->sent = 0;
1107 ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
1108 }
1109 }
1110#endif
209} 1111}
1112
1113/*****************************************************************************/
210 1114
211static void 1115static void
212sighandler (int signum) 1116ev_sighandler (int signum)
213{ 1117{
1118#if EV_MULTIPLICITY
1119 struct ev_loop *loop = &default_loop_struct;
1120#endif
1121
1122#if _WIN32
1123 signal (signum, ev_sighandler);
1124#endif
1125
214 signals [signum - 1].gotsig = 1; 1126 signals [signum - 1].gotsig = 1;
1127 evpipe_write (EV_A_ &gotsig);
1128}
215 1129
216 if (!gotsig) 1130void noinline
1131ev_feed_signal_event (EV_P_ int signum)
1132{
1133 WL w;
1134
1135#if EV_MULTIPLICITY
1136 assert (("libev: feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
1137#endif
1138
1139 --signum;
1140
1141 if (signum < 0 || signum >= signalmax)
1142 return;
1143
1144 signals [signum].gotsig = 0;
1145
1146 for (w = signals [signum].head; w; w = w->next)
1147 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
1148}
1149
1150/*****************************************************************************/
1151
1152static WL childs [EV_PID_HASHSIZE];
1153
1154#ifndef _WIN32
1155
1156static ev_signal childev;
1157
1158#ifndef WIFCONTINUED
1159# define WIFCONTINUED(status) 0
1160#endif
1161
1162void inline_speed
1163child_reap (EV_P_ int chain, int pid, int status)
1164{
1165 ev_child *w;
1166 int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
1167
1168 for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
1169 {
1170 if ((w->pid == pid || !w->pid)
1171 && (!traced || (w->flags & 1)))
1172 {
1173 ev_set_priority (w, EV_MAXPRI); /* need to do it *now*, this *must* be the same prio as the signal watcher itself */
1174 w->rpid = pid;
1175 w->rstatus = status;
1176 ev_feed_event (EV_A_ (W)w, EV_CHILD);
1177 }
1178 }
1179}
1180
1181#ifndef WCONTINUED
1182# define WCONTINUED 0
1183#endif
1184
1185static void
1186childcb (EV_P_ ev_signal *sw, int revents)
1187{
1188 int pid, status;
1189
1190 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
1191 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
1192 if (!WCONTINUED
1193 || errno != EINVAL
1194 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
1195 return;
1196
1197 /* make sure we are called again until all children have been reaped */
1198 /* we need to do it this way so that the callback gets called before we continue */
1199 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
1200
1201 child_reap (EV_A_ pid, pid, status);
1202 if (EV_PID_HASHSIZE > 1)
1203 child_reap (EV_A_ 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
1204}
1205
1206#endif
1207
1208/*****************************************************************************/
1209
1210#if EV_USE_PORT
1211# include "ev_port.c"
1212#endif
1213#if EV_USE_KQUEUE
1214# include "ev_kqueue.c"
1215#endif
1216#if EV_USE_EPOLL
1217# include "ev_epoll.c"
1218#endif
1219#if EV_USE_POLL
1220# include "ev_poll.c"
1221#endif
1222#if EV_USE_SELECT
1223# include "ev_select.c"
1224#endif
1225
1226int
1227ev_version_major (void)
1228{
1229 return EV_VERSION_MAJOR;
1230}
1231
1232int
1233ev_version_minor (void)
1234{
1235 return EV_VERSION_MINOR;
1236}
1237
1238/* return true if we are running with elevated privileges and should ignore env variables */
1239int inline_size
1240enable_secure (void)
1241{
1242#ifdef _WIN32
1243 return 0;
1244#else
1245 return getuid () != geteuid ()
1246 || getgid () != getegid ();
1247#endif
1248}
1249
1250unsigned int
1251ev_supported_backends (void)
1252{
1253 unsigned int flags = 0;
1254
1255 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
1256 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
1257 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
1258 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
1259 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
1260
1261 return flags;
1262}
1263
1264unsigned int
1265ev_recommended_backends (void)
1266{
1267 unsigned int flags = ev_supported_backends ();
1268
1269#ifndef __NetBSD__
1270 /* kqueue is borked on everything but netbsd apparently */
1271 /* it usually doesn't work correctly on anything but sockets and pipes */
1272 flags &= ~EVBACKEND_KQUEUE;
1273#endif
1274#ifdef __APPLE__
1275 /* only select works correctly on that "unix-certified" platform */
1276 flags &= ~EVBACKEND_KQUEUE; /* horribly broken, even for sockets */
1277 flags &= ~EVBACKEND_POLL; /* poll is based on kqueue from 10.5 onwards */
1278#endif
1279
1280 return flags;
1281}
1282
1283unsigned int
1284ev_embeddable_backends (void)
1285{
1286 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
1287
1288 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
1289 /* please fix it and tell me how to detect the fix */
1290 flags &= ~EVBACKEND_EPOLL;
1291
1292 return flags;
1293}
1294
1295unsigned int
1296ev_backend (EV_P)
1297{
1298 return backend;
1299}
1300
1301unsigned int
1302ev_loop_count (EV_P)
1303{
1304 return loop_count;
1305}
1306
1307void
1308ev_set_io_collect_interval (EV_P_ ev_tstamp interval)
1309{
1310 io_blocktime = interval;
1311}
1312
1313void
1314ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval)
1315{
1316 timeout_blocktime = interval;
1317}
1318
1319static void noinline
1320loop_init (EV_P_ unsigned int flags)
1321{
1322 if (!backend)
1323 {
1324#if EV_USE_MONOTONIC
217 { 1325 {
1326 struct timespec ts;
1327 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
1328 have_monotonic = 1;
1329 }
1330#endif
1331
1332 ev_rt_now = ev_time ();
1333 mn_now = get_clock ();
1334 now_floor = mn_now;
1335 rtmn_diff = ev_rt_now - mn_now;
1336
1337 io_blocktime = 0.;
1338 timeout_blocktime = 0.;
1339 backend = 0;
1340 backend_fd = -1;
1341 gotasync = 0;
1342#if EV_USE_INOTIFY
1343 fs_fd = -2;
1344#endif
1345
1346 /* pid check not overridable via env */
1347#ifndef _WIN32
1348 if (flags & EVFLAG_FORKCHECK)
1349 curpid = getpid ();
1350#endif
1351
1352 if (!(flags & EVFLAG_NOENV)
1353 && !enable_secure ()
1354 && getenv ("LIBEV_FLAGS"))
1355 flags = atoi (getenv ("LIBEV_FLAGS"));
1356
1357 if (!(flags & 0x0000ffffU))
1358 flags |= ev_recommended_backends ();
1359
1360#if EV_USE_PORT
1361 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
1362#endif
1363#if EV_USE_KQUEUE
1364 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
1365#endif
1366#if EV_USE_EPOLL
1367 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
1368#endif
1369#if EV_USE_POLL
1370 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
1371#endif
1372#if EV_USE_SELECT
1373 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
1374#endif
1375
1376 ev_init (&pipeev, pipecb);
1377 ev_set_priority (&pipeev, EV_MAXPRI);
1378 }
1379}
1380
1381static void noinline
1382loop_destroy (EV_P)
1383{
1384 int i;
1385
1386 if (ev_is_active (&pipeev))
1387 {
1388 ev_ref (EV_A); /* signal watcher */
1389 ev_io_stop (EV_A_ &pipeev);
1390
1391#if EV_USE_EVENTFD
1392 if (evfd >= 0)
1393 close (evfd);
1394#endif
1395
1396 if (evpipe [0] >= 0)
1397 {
1398 close (evpipe [0]);
1399 close (evpipe [1]);
1400 }
1401 }
1402
1403#if EV_USE_INOTIFY
1404 if (fs_fd >= 0)
1405 close (fs_fd);
1406#endif
1407
1408 if (backend_fd >= 0)
1409 close (backend_fd);
1410
1411#if EV_USE_PORT
1412 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
1413#endif
1414#if EV_USE_KQUEUE
1415 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
1416#endif
1417#if EV_USE_EPOLL
1418 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
1419#endif
1420#if EV_USE_POLL
1421 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
1422#endif
1423#if EV_USE_SELECT
1424 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
1425#endif
1426
1427 for (i = NUMPRI; i--; )
1428 {
1429 array_free (pending, [i]);
1430#if EV_IDLE_ENABLE
1431 array_free (idle, [i]);
1432#endif
1433 }
1434
1435 ev_free (anfds); anfdmax = 0;
1436
1437 /* have to use the microsoft-never-gets-it-right macro */
1438 array_free (fdchange, EMPTY);
1439 array_free (timer, EMPTY);
1440#if EV_PERIODIC_ENABLE
1441 array_free (periodic, EMPTY);
1442#endif
1443#if EV_FORK_ENABLE
1444 array_free (fork, EMPTY);
1445#endif
1446 array_free (prepare, EMPTY);
1447 array_free (check, EMPTY);
1448#if EV_ASYNC_ENABLE
1449 array_free (async, EMPTY);
1450#endif
1451
1452 backend = 0;
1453}
1454
1455#if EV_USE_INOTIFY
1456void inline_size infy_fork (EV_P);
1457#endif
1458
1459void inline_size
1460loop_fork (EV_P)
1461{
1462#if EV_USE_PORT
1463 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
1464#endif
1465#if EV_USE_KQUEUE
1466 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
1467#endif
1468#if EV_USE_EPOLL
1469 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
1470#endif
1471#if EV_USE_INOTIFY
1472 infy_fork (EV_A);
1473#endif
1474
1475 if (ev_is_active (&pipeev))
1476 {
1477 /* this "locks" the handlers against writing to the pipe */
1478 /* while we modify the fd vars */
218 gotsig = 1; 1479 gotsig = 1;
219 write (sigpipe [1], &gotsig, 1); 1480#if EV_ASYNC_ENABLE
220 } 1481 gotasync = 1;
221} 1482#endif
222 1483
223static void 1484 ev_ref (EV_A);
224sigcb (struct ev_io *iow, int revents) 1485 ev_io_stop (EV_A_ &pipeev);
1486
1487#if EV_USE_EVENTFD
1488 if (evfd >= 0)
1489 close (evfd);
1490#endif
1491
1492 if (evpipe [0] >= 0)
1493 {
1494 close (evpipe [0]);
1495 close (evpipe [1]);
1496 }
1497
1498 evpipe_init (EV_A);
1499 /* now iterate over everything, in case we missed something */
1500 pipecb (EV_A_ &pipeev, EV_READ);
1501 }
1502
1503 postfork = 0;
1504}
1505
1506#if EV_MULTIPLICITY
1507
1508struct ev_loop *
1509ev_loop_new (unsigned int flags)
225{ 1510{
226 struct ev_signal *w; 1511 struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
1512
1513 memset (loop, 0, sizeof (struct ev_loop));
1514
1515 loop_init (EV_A_ flags);
1516
1517 if (ev_backend (EV_A))
1518 return loop;
1519
1520 return 0;
1521}
1522
1523void
1524ev_loop_destroy (EV_P)
1525{
1526 loop_destroy (EV_A);
1527 ev_free (loop);
1528}
1529
1530void
1531ev_loop_fork (EV_P)
1532{
1533 postfork = 1; /* must be in line with ev_default_fork */
1534}
1535
1536#if EV_VERIFY
1537static void noinline
1538verify_watcher (EV_P_ W w)
1539{
1540 assert (("libev: watcher has invalid priority", ABSPRI (w) >= 0 && ABSPRI (w) < NUMPRI));
1541
1542 if (w->pending)
1543 assert (("libev: pending watcher not on pending queue", pendings [ABSPRI (w)][w->pending - 1].w == w));
1544}
1545
1546static void noinline
1547verify_heap (EV_P_ ANHE *heap, int N)
1548{
227 int sig; 1549 int i;
228 1550
229 gotsig = 0; 1551 for (i = HEAP0; i < N + HEAP0; ++i)
230 read (sigpipe [0], &revents, 1); 1552 {
1553 assert (("libev: active index mismatch in heap", ev_active (ANHE_w (heap [i])) == i));
1554 assert (("libev: heap condition violated", i == HEAP0 || ANHE_at (heap [HPARENT (i)]) <= ANHE_at (heap [i])));
1555 assert (("libev: heap at cache mismatch", ANHE_at (heap [i]) == ev_at (ANHE_w (heap [i]))));
231 1556
232 for (sig = signalmax; sig--; ) 1557 verify_watcher (EV_A_ (W)ANHE_w (heap [i]));
233 if (signals [sig].gotsig) 1558 }
1559}
1560
1561static void noinline
1562array_verify (EV_P_ W *ws, int cnt)
1563{
1564 while (cnt--)
1565 {
1566 assert (("libev: active index mismatch", ev_active (ws [cnt]) == cnt + 1));
1567 verify_watcher (EV_A_ ws [cnt]);
1568 }
1569}
1570#endif
1571
1572void
1573ev_loop_verify (EV_P)
1574{
1575#if EV_VERIFY
1576 int i;
1577 WL w;
1578
1579 assert (activecnt >= -1);
1580
1581 assert (fdchangemax >= fdchangecnt);
1582 for (i = 0; i < fdchangecnt; ++i)
1583 assert (("libev: negative fd in fdchanges", fdchanges [i] >= 0));
1584
1585 assert (anfdmax >= 0);
1586 for (i = 0; i < anfdmax; ++i)
1587 for (w = anfds [i].head; w; w = w->next)
234 { 1588 {
235 signals [sig].gotsig = 0; 1589 verify_watcher (EV_A_ (W)w);
236 1590 assert (("libev: inactive fd watcher on anfd list", ev_active (w) == 1));
237 for (w = signals [sig].head; w; w = w->next) 1591 assert (("libev: fd mismatch between watcher and anfd", ((ev_io *)w)->fd == i));
238 event ((struct ev_watcher *)w, EV_SIGNAL);
239 } 1592 }
240}
241 1593
242static void 1594 assert (timermax >= timercnt);
243siginit (void) 1595 verify_heap (EV_A_ timers, timercnt);
244{
245 fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
246 fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
247 1596
248 /* rather than sort out wether we really need nb, set it */ 1597#if EV_PERIODIC_ENABLE
249 fcntl (sigpipe [0], F_SETFL, O_NONBLOCK); 1598 assert (periodicmax >= periodiccnt);
250 fcntl (sigpipe [1], F_SETFL, O_NONBLOCK); 1599 verify_heap (EV_A_ periodics, periodiccnt);
1600#endif
251 1601
252 evio_set (&sigev, sigpipe [0], EV_READ); 1602 for (i = NUMPRI; i--; )
253 evio_start (&sigev); 1603 {
254} 1604 assert (pendingmax [i] >= pendingcnt [i]);
1605#if EV_IDLE_ENABLE
1606 assert (idleall >= 0);
1607 assert (idlemax [i] >= idlecnt [i]);
1608 array_verify (EV_A_ (W *)idles [i], idlecnt [i]);
1609#endif
1610 }
255 1611
256#if HAVE_EPOLL 1612#if EV_FORK_ENABLE
257# include "ev_epoll.c" 1613 assert (forkmax >= forkcnt);
1614 array_verify (EV_A_ (W *)forks, forkcnt);
1615#endif
1616
1617#if EV_ASYNC_ENABLE
1618 assert (asyncmax >= asynccnt);
1619 array_verify (EV_A_ (W *)asyncs, asynccnt);
1620#endif
1621
1622 assert (preparemax >= preparecnt);
1623 array_verify (EV_A_ (W *)prepares, preparecnt);
1624
1625 assert (checkmax >= checkcnt);
1626 array_verify (EV_A_ (W *)checks, checkcnt);
1627
1628# if 0
1629 for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
1630 for (signum = signalmax; signum--; ) if (signals [signum].gotsig)
258#endif 1631# endif
259#if HAVE_SELECT
260# include "ev_select.c"
261#endif 1632#endif
1633}
262 1634
263int ev_init (int flags) 1635#endif /* multiplicity */
264{
265#if HAVE_MONOTONIC
266 {
267 struct timespec ts;
268 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
269 have_monotonic = 1;
270 }
271#endif
272 1636
273 ev_now = ev_time (); 1637#if EV_MULTIPLICITY
274 now = get_clock (); 1638struct ev_loop *
275 diff = ev_now - now; 1639ev_default_loop_init (unsigned int flags)
276 1640#else
277 if (pipe (sigpipe)) 1641int
278 return 0; 1642ev_default_loop (unsigned int flags)
279
280 ev_method = EVMETHOD_NONE;
281#if HAVE_EPOLL
282 if (ev_method == EVMETHOD_NONE) epoll_init (flags);
283#endif 1643#endif
284#if HAVE_SELECT 1644{
285 if (ev_method == EVMETHOD_NONE) select_init (flags); 1645 if (!ev_default_loop_ptr)
286#endif
287
288 if (ev_method)
289 {
290 evw_init (&sigev, sigcb, 0);
291 siginit ();
292 } 1646 {
293 1647#if EV_MULTIPLICITY
294 return ev_method; 1648 struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
295} 1649#else
296 1650 ev_default_loop_ptr = 1;
297void ev_prefork (void)
298{
299}
300
301void ev_postfork_parent (void)
302{
303}
304
305void ev_postfork_child (void)
306{
307#if HAVE_EPOLL
308 if (ev_method == EVMETHOD_EPOLL)
309 epoll_postfork_child ();
310#endif 1651#endif
311 1652
312 evio_stop (&sigev); 1653 loop_init (EV_A_ flags);
313 close (sigpipe [0]);
314 close (sigpipe [1]);
315 pipe (sigpipe);
316 siginit ();
317}
318 1654
319static void 1655 if (ev_backend (EV_A))
320fd_reify (void)
321{
322 int i;
323
324 for (i = 0; i < fdchangecnt; ++i)
325 {
326 int fd = fdchanges [i];
327 ANFD *anfd = anfds + fd;
328 struct ev_io *w;
329
330 int wev = 0;
331
332 for (w = anfd->head; w; w = w->next)
333 wev |= w->events;
334
335 if (anfd->wev != wev)
336 { 1656 {
337 method_modify (fd, anfd->wev, wev); 1657#ifndef _WIN32
338 anfd->wev = wev; 1658 ev_signal_init (&childev, childcb, SIGCHLD);
1659 ev_set_priority (&childev, EV_MAXPRI);
1660 ev_signal_start (EV_A_ &childev);
1661 ev_unref (EV_A); /* child watcher should not keep loop alive */
1662#endif
339 } 1663 }
1664 else
1665 ev_default_loop_ptr = 0;
340 } 1666 }
341 1667
342 fdchangecnt = 0; 1668 return ev_default_loop_ptr;
343} 1669}
344 1670
345static void 1671void
1672ev_default_destroy (void)
1673{
1674#if EV_MULTIPLICITY
1675 struct ev_loop *loop = ev_default_loop_ptr;
1676#endif
1677
1678 ev_default_loop_ptr = 0;
1679
1680#ifndef _WIN32
1681 ev_ref (EV_A); /* child watcher */
1682 ev_signal_stop (EV_A_ &childev);
1683#endif
1684
1685 loop_destroy (EV_A);
1686}
1687
1688void
1689ev_default_fork (void)
1690{
1691#if EV_MULTIPLICITY
1692 struct ev_loop *loop = ev_default_loop_ptr;
1693#endif
1694
1695 postfork = 1; /* must be in line with ev_loop_fork */
1696}
1697
1698/*****************************************************************************/
1699
1700void
1701ev_invoke (EV_P_ void *w, int revents)
1702{
1703 EV_CB_INVOKE ((W)w, revents);
1704}
1705
1706void inline_speed
346call_pending () 1707call_pending (EV_P)
347{ 1708{
348 int i; 1709 int pri;
349 1710
350 for (i = 0; i < pendingcnt; ++i) 1711 for (pri = NUMPRI; pri--; )
1712 while (pendingcnt [pri])
351 { 1713 {
352 ANPENDING *p = pendings + i; 1714 ANPENDING *p = pendings [pri] + --pendingcnt [pri];
353 1715
354 if (p->w) 1716 if (expect_true (p->w))
1717 {
1718 /*assert (("libev: non-pending watcher on pending list", p->w->pending));*/
1719
1720 p->w->pending = 0;
1721 EV_CB_INVOKE (p->w, p->events);
1722 EV_FREQUENT_CHECK;
1723 }
1724 }
1725}
1726
1727#if EV_IDLE_ENABLE
1728void inline_size
1729idle_reify (EV_P)
1730{
1731 if (expect_false (idleall))
1732 {
1733 int pri;
1734
1735 for (pri = NUMPRI; pri--; )
355 { 1736 {
356 p->w->pending = 0; 1737 if (pendingcnt [pri])
357 p->w->cb (p->w, p->events); 1738 break;
1739
1740 if (idlecnt [pri])
1741 {
1742 queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
1743 break;
1744 }
358 } 1745 }
359 } 1746 }
360
361 pendingcnt = 0;
362} 1747}
1748#endif
363 1749
364static void 1750void inline_size
365timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now) 1751timers_reify (EV_P)
366{ 1752{
1753 EV_FREQUENT_CHECK;
1754
367 while (timercnt && timers [0]->at <= now) 1755 while (timercnt && ANHE_at (timers [HEAP0]) < mn_now)
368 { 1756 {
369 struct ev_timer *w = timers [0]; 1757 ev_timer *w = (ev_timer *)ANHE_w (timers [HEAP0]);
1758
1759 /*assert (("libev: inactive timer on timer heap detected", ev_is_active (w)));*/
370 1760
371 /* first reschedule or stop timer */ 1761 /* first reschedule or stop timer */
372 if (w->repeat) 1762 if (w->repeat)
373 { 1763 {
374 if (w->is_abs) 1764 ev_at (w) += w->repeat;
375 w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat; 1765 if (ev_at (w) < mn_now)
376 else 1766 ev_at (w) = mn_now;
377 w->at = now + w->repeat;
378 1767
379 assert (w->at > now); 1768 assert (("libev: negative ev_timer repeat value found while processing timers", w->repeat > 0.));
380 1769
1770 ANHE_at_cache (timers [HEAP0]);
381 downheap (timers, timercnt, 0); 1771 downheap (timers, timercnt, HEAP0);
382 } 1772 }
383 else 1773 else
1774 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
1775
1776 EV_FREQUENT_CHECK;
1777 ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
1778 }
1779}
1780
1781#if EV_PERIODIC_ENABLE
1782void inline_size
1783periodics_reify (EV_P)
1784{
1785 EV_FREQUENT_CHECK;
1786
1787 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now)
1788 {
1789 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [HEAP0]);
1790
1791 /*assert (("libev: inactive timer on periodic heap detected", ev_is_active (w)));*/
1792
1793 /* first reschedule or stop timer */
1794 if (w->reschedule_cb)
384 { 1795 {
385 evtimer_stop (w); /* nonrepeating: stop timer */ 1796 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
386 --timercnt; /* maybe pass by reference instead? */ 1797
1798 assert (("libev: ev_periodic reschedule callback returned time in the past", ev_at (w) >= ev_rt_now));
1799
1800 ANHE_at_cache (periodics [HEAP0]);
1801 downheap (periodics, periodiccnt, HEAP0);
387 } 1802 }
1803 else if (w->interval)
1804 {
1805 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
1806 /* if next trigger time is not sufficiently in the future, put it there */
1807 /* this might happen because of floating point inexactness */
1808 if (ev_at (w) - ev_rt_now < TIME_EPSILON)
1809 {
1810 ev_at (w) += w->interval;
388 1811
389 event ((struct ev_watcher *)w, EV_TIMEOUT); 1812 /* if interval is unreasonably low we might still have a time in the past */
390 } 1813 /* so correct this. this will make the periodic very inexact, but the user */
391} 1814 /* has effectively asked to get triggered more often than possible */
1815 if (ev_at (w) < ev_rt_now)
1816 ev_at (w) = ev_rt_now;
1817 }
392 1818
393static void 1819 ANHE_at_cache (periodics [HEAP0]);
394time_update () 1820 downheap (periodics, periodiccnt, HEAP0);
1821 }
1822 else
1823 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
1824
1825 EV_FREQUENT_CHECK;
1826 ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
1827 }
1828}
1829
1830static void noinline
1831periodics_reschedule (EV_P)
395{ 1832{
396 int i; 1833 int i;
397 ev_now = ev_time ();
398 1834
399 if (have_monotonic) 1835 /* adjust periodics after time jump */
1836 for (i = HEAP0; i < periodiccnt + HEAP0; ++i)
1837 {
1838 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [i]);
1839
1840 if (w->reschedule_cb)
1841 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
1842 else if (w->interval)
1843 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
1844
1845 ANHE_at_cache (periodics [i]);
400 { 1846 }
1847
1848 reheap (periodics, periodiccnt);
1849}
1850#endif
1851
1852void inline_speed
1853time_update (EV_P_ ev_tstamp max_block)
1854{
1855 int i;
1856
1857#if EV_USE_MONOTONIC
1858 if (expect_true (have_monotonic))
1859 {
401 ev_tstamp odiff = diff; 1860 ev_tstamp odiff = rtmn_diff;
402 1861
403 /* detecting time jumps is much more difficult */ 1862 mn_now = get_clock ();
404 for (i = 2; --i; ) /* loop a few times, before making important decisions */ 1863
1864 /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
1865 /* interpolate in the meantime */
1866 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
405 { 1867 {
406 now = get_clock (); 1868 ev_rt_now = rtmn_diff + mn_now;
1869 return;
1870 }
1871
1872 now_floor = mn_now;
1873 ev_rt_now = ev_time ();
1874
1875 /* loop a few times, before making important decisions.
1876 * on the choice of "4": one iteration isn't enough,
1877 * in case we get preempted during the calls to
1878 * ev_time and get_clock. a second call is almost guaranteed
1879 * to succeed in that case, though. and looping a few more times
1880 * doesn't hurt either as we only do this on time-jumps or
1881 * in the unlikely event of having been preempted here.
1882 */
1883 for (i = 4; --i; )
1884 {
407 diff = ev_now - now; 1885 rtmn_diff = ev_rt_now - mn_now;
408 1886
409 if (fabs (odiff - diff) < MIN_TIMEJUMP) 1887 if (expect_true (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP))
410 return; /* all is well */ 1888 return; /* all is well */
411 1889
412 ev_now = ev_time (); 1890 ev_rt_now = ev_time ();
1891 mn_now = get_clock ();
1892 now_floor = mn_now;
413 } 1893 }
414 1894
415 /* time jump detected, reschedule atimers */ 1895# if EV_PERIODIC_ENABLE
416 for (i = 0; i < atimercnt; ++i) 1896 periodics_reschedule (EV_A);
1897# endif
1898 /* no timer adjustment, as the monotonic clock doesn't jump */
1899 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
1900 }
1901 else
1902#endif
1903 {
1904 ev_rt_now = ev_time ();
1905
1906 if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
417 { 1907 {
418 struct ev_timer *w = atimers [i]; 1908#if EV_PERIODIC_ENABLE
419 w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat; 1909 periodics_reschedule (EV_A);
1910#endif
1911 /* adjust timers. this is easy, as the offset is the same for all of them */
1912 for (i = 0; i < timercnt; ++i)
1913 {
1914 ANHE *he = timers + i + HEAP0;
1915 ANHE_w (*he)->at += ev_rt_now - mn_now;
1916 ANHE_at_cache (*he);
1917 }
420 } 1918 }
421 }
422 else
423 {
424 if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
425 /* time jump detected, adjust rtimers */
426 for (i = 0; i < rtimercnt; ++i)
427 rtimers [i]->at += ev_now - now;
428 1919
429 now = ev_now; 1920 mn_now = ev_rt_now;
430 } 1921 }
431} 1922}
432 1923
433int ev_loop_done; 1924void
1925ev_ref (EV_P)
1926{
1927 ++activecnt;
1928}
434 1929
1930void
1931ev_unref (EV_P)
1932{
1933 --activecnt;
1934}
1935
1936void
1937ev_now_update (EV_P)
1938{
1939 time_update (EV_A_ 1e100);
1940}
1941
1942static int loop_done;
1943
1944void
435void ev_loop (int flags) 1945ev_loop (EV_P_ int flags)
436{ 1946{
437 double block; 1947 loop_done = EVUNLOOP_CANCEL;
438 ev_loop_done = flags & EVLOOP_ONESHOT; 1948
1949 call_pending (EV_A); /* in case we recurse, ensure ordering stays nice and clean */
439 1950
440 do 1951 do
441 { 1952 {
1953#if EV_VERIFY >= 2
1954 ev_loop_verify (EV_A);
1955#endif
1956
1957#ifndef _WIN32
1958 if (expect_false (curpid)) /* penalise the forking check even more */
1959 if (expect_false (getpid () != curpid))
1960 {
1961 curpid = getpid ();
1962 postfork = 1;
1963 }
1964#endif
1965
1966#if EV_FORK_ENABLE
1967 /* we might have forked, so queue fork handlers */
1968 if (expect_false (postfork))
1969 if (forkcnt)
1970 {
1971 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
1972 call_pending (EV_A);
1973 }
1974#endif
1975
1976 /* queue prepare watchers (and execute them) */
1977 if (expect_false (preparecnt))
1978 {
1979 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
1980 call_pending (EV_A);
1981 }
1982
1983 if (expect_false (!activecnt))
1984 break;
1985
1986 /* we might have forked, so reify kernel state if necessary */
1987 if (expect_false (postfork))
1988 loop_fork (EV_A);
1989
442 /* update fd-related kernel structures */ 1990 /* update fd-related kernel structures */
443 fd_reify (); 1991 fd_reify (EV_A);
444 1992
445 /* calculate blocking time */ 1993 /* calculate blocking time */
446 if (flags & EVLOOP_NONBLOCK) 1994 {
447 block = 0.; 1995 ev_tstamp waittime = 0.;
448 else 1996 ev_tstamp sleeptime = 0.;
1997
1998 if (expect_true (!(flags & EVLOOP_NONBLOCK || idleall || !activecnt)))
449 { 1999 {
2000 /* update time to cancel out callback processing overhead */
2001 time_update (EV_A_ 1e100);
2002
450 block = MAX_BLOCKTIME; 2003 waittime = MAX_BLOCKTIME;
451 2004
452 if (rtimercnt) 2005 if (timercnt)
453 { 2006 {
454 ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge; 2007 ev_tstamp to = ANHE_at (timers [HEAP0]) - mn_now + backend_fudge;
455 if (block > to) block = to; 2008 if (waittime > to) waittime = to;
456 } 2009 }
457 2010
2011#if EV_PERIODIC_ENABLE
458 if (atimercnt) 2012 if (periodiccnt)
459 { 2013 {
460 ev_tstamp to = atimers [0]->at - ev_time () + method_fudge; 2014 ev_tstamp to = ANHE_at (periodics [HEAP0]) - ev_rt_now + backend_fudge;
461 if (block > to) block = to; 2015 if (waittime > to) waittime = to;
462 } 2016 }
2017#endif
463 2018
464 if (block < 0.) block = 0.; 2019 if (expect_false (waittime < timeout_blocktime))
2020 waittime = timeout_blocktime;
2021
2022 sleeptime = waittime - backend_fudge;
2023
2024 if (expect_true (sleeptime > io_blocktime))
2025 sleeptime = io_blocktime;
2026
2027 if (sleeptime)
2028 {
2029 ev_sleep (sleeptime);
2030 waittime -= sleeptime;
2031 }
465 } 2032 }
466 2033
467 method_poll (block); 2034 ++loop_count;
2035 backend_poll (EV_A_ waittime);
468 2036
469 /* update ev_now, do magic */ 2037 /* update ev_rt_now, do magic */
470 time_update (); 2038 time_update (EV_A_ waittime + sleeptime);
2039 }
471 2040
472 /* put pending timers into pendign queue and reschedule them */ 2041 /* queue pending timers and reschedule them */
473 /* absolute timers first */ 2042 timers_reify (EV_A); /* relative timers called last */
474 timers_reify (atimers, atimercnt, ev_now); 2043#if EV_PERIODIC_ENABLE
475 /* relative timers second */ 2044 periodics_reify (EV_A); /* absolute timers called first */
476 timers_reify (rtimers, rtimercnt, now); 2045#endif
477 2046
2047#if EV_IDLE_ENABLE
2048 /* queue idle watchers unless other events are pending */
2049 idle_reify (EV_A);
2050#endif
2051
2052 /* queue check watchers, to be executed first */
2053 if (expect_false (checkcnt))
2054 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
2055
478 call_pending (); 2056 call_pending (EV_A);
479 } 2057 }
480 while (!ev_loop_done); 2058 while (expect_true (
481} 2059 activecnt
2060 && !loop_done
2061 && !(flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK))
2062 ));
482 2063
483static void 2064 if (loop_done == EVUNLOOP_ONE)
484wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem) 2065 loop_done = EVUNLOOP_CANCEL;
2066}
2067
2068void
2069ev_unloop (EV_P_ int how)
2070{
2071 loop_done = how;
2072}
2073
2074/*****************************************************************************/
2075
2076void inline_size
2077wlist_add (WL *head, WL elem)
485{ 2078{
486 elem->next = *head; 2079 elem->next = *head;
487 *head = elem; 2080 *head = elem;
488} 2081}
489 2082
490static void 2083void inline_size
491wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem) 2084wlist_del (WL *head, WL elem)
492{ 2085{
493 while (*head) 2086 while (*head)
494 { 2087 {
495 if (*head == elem) 2088 if (*head == elem)
496 { 2089 {
… …
500 2093
501 head = &(*head)->next; 2094 head = &(*head)->next;
502 } 2095 }
503} 2096}
504 2097
505static void 2098void inline_speed
506ev_start (struct ev_watcher *w, int active) 2099clear_pending (EV_P_ W w)
507{ 2100{
2101 if (w->pending)
2102 {
2103 pendings [ABSPRI (w)][w->pending - 1].w = 0;
508 w->pending = 0; 2104 w->pending = 0;
2105 }
2106}
2107
2108int
2109ev_clear_pending (EV_P_ void *w)
2110{
2111 W w_ = (W)w;
2112 int pending = w_->pending;
2113
2114 if (expect_true (pending))
2115 {
2116 ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
2117 w_->pending = 0;
2118 p->w = 0;
2119 return p->events;
2120 }
2121 else
2122 return 0;
2123}
2124
2125void inline_size
2126pri_adjust (EV_P_ W w)
2127{
2128 int pri = w->priority;
2129 pri = pri < EV_MINPRI ? EV_MINPRI : pri;
2130 pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
2131 w->priority = pri;
2132}
2133
2134void inline_speed
2135ev_start (EV_P_ W w, int active)
2136{
2137 pri_adjust (EV_A_ w);
509 w->active = active; 2138 w->active = active;
2139 ev_ref (EV_A);
510} 2140}
511 2141
512static void 2142void inline_size
513ev_stop (struct ev_watcher *w) 2143ev_stop (EV_P_ W w)
514{ 2144{
515 if (w->pending) 2145 ev_unref (EV_A);
516 pendings [w->pending - 1].w = 0;
517
518 w->active = 0; 2146 w->active = 0;
519 /* nop */
520} 2147}
521 2148
522void 2149/*****************************************************************************/
2150
2151void noinline
523evio_start (struct ev_io *w) 2152ev_io_start (EV_P_ ev_io *w)
524{ 2153{
2154 int fd = w->fd;
2155
2156 if (expect_false (ev_is_active (w)))
2157 return;
2158
2159 assert (("libev: ev_io_start called with negative fd", fd >= 0));
2160 assert (("libev: ev_io start called with illegal event mask", !(w->events & ~(EV_IOFDSET | EV_READ | EV_WRITE))));
2161
2162 EV_FREQUENT_CHECK;
2163
2164 ev_start (EV_A_ (W)w, 1);
2165 array_needsize (ANFD, anfds, anfdmax, fd + 1, array_init_zero);
2166 wlist_add (&anfds[fd].head, (WL)w);
2167
2168 fd_change (EV_A_ fd, w->events & EV_IOFDSET | 1);
2169 w->events &= ~EV_IOFDSET;
2170
2171 EV_FREQUENT_CHECK;
2172}
2173
2174void noinline
2175ev_io_stop (EV_P_ ev_io *w)
2176{
2177 clear_pending (EV_A_ (W)w);
2178 if (expect_false (!ev_is_active (w)))
2179 return;
2180
2181 assert (("libev: ev_io_stop called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
2182
2183 EV_FREQUENT_CHECK;
2184
2185 wlist_del (&anfds[w->fd].head, (WL)w);
2186 ev_stop (EV_A_ (W)w);
2187
2188 fd_change (EV_A_ w->fd, 1);
2189
2190 EV_FREQUENT_CHECK;
2191}
2192
2193void noinline
2194ev_timer_start (EV_P_ ev_timer *w)
2195{
2196 if (expect_false (ev_is_active (w)))
2197 return;
2198
2199 ev_at (w) += mn_now;
2200
2201 assert (("libev: ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
2202
2203 EV_FREQUENT_CHECK;
2204
2205 ++timercnt;
2206 ev_start (EV_A_ (W)w, timercnt + HEAP0 - 1);
2207 array_needsize (ANHE, timers, timermax, ev_active (w) + 1, EMPTY2);
2208 ANHE_w (timers [ev_active (w)]) = (WT)w;
2209 ANHE_at_cache (timers [ev_active (w)]);
2210 upheap (timers, ev_active (w));
2211
2212 EV_FREQUENT_CHECK;
2213
2214 /*assert (("libev: internal timer heap corruption", timers [ev_active (w)] == (WT)w));*/
2215}
2216
2217void noinline
2218ev_timer_stop (EV_P_ ev_timer *w)
2219{
2220 clear_pending (EV_A_ (W)w);
2221 if (expect_false (!ev_is_active (w)))
2222 return;
2223
2224 EV_FREQUENT_CHECK;
2225
2226 {
2227 int active = ev_active (w);
2228
2229 assert (("libev: internal timer heap corruption", ANHE_w (timers [active]) == (WT)w));
2230
2231 --timercnt;
2232
2233 if (expect_true (active < timercnt + HEAP0))
2234 {
2235 timers [active] = timers [timercnt + HEAP0];
2236 adjustheap (timers, timercnt, active);
2237 }
2238 }
2239
2240 EV_FREQUENT_CHECK;
2241
2242 ev_at (w) -= mn_now;
2243
2244 ev_stop (EV_A_ (W)w);
2245}
2246
2247void noinline
2248ev_timer_again (EV_P_ ev_timer *w)
2249{
2250 EV_FREQUENT_CHECK;
2251
525 if (ev_is_active (w)) 2252 if (ev_is_active (w))
2253 {
2254 if (w->repeat)
2255 {
2256 ev_at (w) = mn_now + w->repeat;
2257 ANHE_at_cache (timers [ev_active (w)]);
2258 adjustheap (timers, timercnt, ev_active (w));
2259 }
2260 else
2261 ev_timer_stop (EV_A_ w);
2262 }
2263 else if (w->repeat)
2264 {
2265 ev_at (w) = w->repeat;
2266 ev_timer_start (EV_A_ w);
2267 }
2268
2269 EV_FREQUENT_CHECK;
2270}
2271
2272#if EV_PERIODIC_ENABLE
2273void noinline
2274ev_periodic_start (EV_P_ ev_periodic *w)
2275{
2276 if (expect_false (ev_is_active (w)))
526 return; 2277 return;
527 2278
528 int fd = w->fd; 2279 if (w->reschedule_cb)
2280 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2281 else if (w->interval)
2282 {
2283 assert (("libev: ev_periodic_start called with negative interval value", w->interval >= 0.));
2284 /* this formula differs from the one in periodic_reify because we do not always round up */
2285 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
2286 }
2287 else
2288 ev_at (w) = w->offset;
529 2289
530 ev_start ((struct ev_watcher *)w, 1); 2290 EV_FREQUENT_CHECK;
531 array_needsize (anfds, anfdmax, fd + 1, anfds_init);
532 wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w);
533 2291
534 ++fdchangecnt; 2292 ++periodiccnt;
535 array_needsize (fdchanges, fdchangemax, fdchangecnt, ); 2293 ev_start (EV_A_ (W)w, periodiccnt + HEAP0 - 1);
536 fdchanges [fdchangecnt - 1] = fd; 2294 array_needsize (ANHE, periodics, periodicmax, ev_active (w) + 1, EMPTY2);
537} 2295 ANHE_w (periodics [ev_active (w)]) = (WT)w;
2296 ANHE_at_cache (periodics [ev_active (w)]);
2297 upheap (periodics, ev_active (w));
538 2298
539void 2299 EV_FREQUENT_CHECK;
540evio_stop (struct ev_io *w) 2300
2301 /*assert (("libev: internal periodic heap corruption", ANHE_w (periodics [ev_active (w)]) == (WT)w));*/
2302}
2303
2304void noinline
2305ev_periodic_stop (EV_P_ ev_periodic *w)
541{ 2306{
2307 clear_pending (EV_A_ (W)w);
542 if (!ev_is_active (w)) 2308 if (expect_false (!ev_is_active (w)))
543 return; 2309 return;
544 2310
545 wlist_del ((struct ev_watcher_list **)&anfds[w->fd].head, (struct ev_watcher_list *)w); 2311 EV_FREQUENT_CHECK;
546 ev_stop ((struct ev_watcher *)w);
547 2312
548 ++fdchangecnt; 2313 {
549 array_needsize (fdchanges, fdchangemax, fdchangecnt, ); 2314 int active = ev_active (w);
550 fdchanges [fdchangecnt - 1] = w->fd;
551}
552 2315
553void 2316 assert (("libev: internal periodic heap corruption", ANHE_w (periodics [active]) == (WT)w));
554evtimer_start (struct ev_timer *w) 2317
2318 --periodiccnt;
2319
2320 if (expect_true (active < periodiccnt + HEAP0))
2321 {
2322 periodics [active] = periodics [periodiccnt + HEAP0];
2323 adjustheap (periodics, periodiccnt, active);
2324 }
2325 }
2326
2327 EV_FREQUENT_CHECK;
2328
2329 ev_stop (EV_A_ (W)w);
2330}
2331
2332void noinline
2333ev_periodic_again (EV_P_ ev_periodic *w)
555{ 2334{
2335 /* TODO: use adjustheap and recalculation */
2336 ev_periodic_stop (EV_A_ w);
2337 ev_periodic_start (EV_A_ w);
2338}
2339#endif
2340
2341#ifndef SA_RESTART
2342# define SA_RESTART 0
2343#endif
2344
2345void noinline
2346ev_signal_start (EV_P_ ev_signal *w)
2347{
2348#if EV_MULTIPLICITY
2349 assert (("libev: signal watchers are only supported in the default loop", loop == ev_default_loop_ptr));
2350#endif
556 if (ev_is_active (w)) 2351 if (expect_false (ev_is_active (w)))
557 return; 2352 return;
558 2353
559 if (w->is_abs) 2354 assert (("libev: ev_signal_start called with illegal signal number", w->signum > 0));
2355
2356 evpipe_init (EV_A);
2357
2358 EV_FREQUENT_CHECK;
2359
560 { 2360 {
561 /* this formula differs from the one in timer_reify becuse we do not round up */ 2361#ifndef _WIN32
562 if (w->repeat) 2362 sigset_t full, prev;
563 w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat; 2363 sigfillset (&full);
2364 sigprocmask (SIG_SETMASK, &full, &prev);
2365#endif
564 2366
565 ev_start ((struct ev_watcher *)w, ++atimercnt); 2367 array_needsize (ANSIG, signals, signalmax, w->signum, array_init_zero);
566 array_needsize (atimers, atimermax, atimercnt, ); 2368
567 atimers [atimercnt - 1] = w; 2369#ifndef _WIN32
568 upheap (atimers, atimercnt - 1); 2370 sigprocmask (SIG_SETMASK, &prev, 0);
2371#endif
2372 }
2373
2374 ev_start (EV_A_ (W)w, 1);
2375 wlist_add (&signals [w->signum - 1].head, (WL)w);
2376
2377 if (!((WL)w)->next)
569 } 2378 {
570 else 2379#if _WIN32
2380 signal (w->signum, ev_sighandler);
2381#else
2382 struct sigaction sa;
2383 sa.sa_handler = ev_sighandler;
2384 sigfillset (&sa.sa_mask);
2385 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
2386 sigaction (w->signum, &sa, 0);
2387#endif
571 { 2388 }
572 w->at += now;
573 2389
574 ev_start ((struct ev_watcher *)w, ++rtimercnt); 2390 EV_FREQUENT_CHECK;
575 array_needsize (rtimers, rtimermax, rtimercnt, );
576 rtimers [rtimercnt - 1] = w;
577 upheap (rtimers, rtimercnt - 1);
578 }
579
580} 2391}
581 2392
582void 2393void noinline
583evtimer_stop (struct ev_timer *w) 2394ev_signal_stop (EV_P_ ev_signal *w)
584{ 2395{
2396 clear_pending (EV_A_ (W)w);
585 if (!ev_is_active (w)) 2397 if (expect_false (!ev_is_active (w)))
586 return; 2398 return;
587 2399
588 if (w->is_abs) 2400 EV_FREQUENT_CHECK;
589 {
590 if (w->active < atimercnt--)
591 {
592 atimers [w->active - 1] = atimers [atimercnt];
593 downheap (atimers, atimercnt, w->active - 1);
594 }
595 }
596 else
597 {
598 if (w->active < rtimercnt--)
599 {
600 rtimers [w->active - 1] = rtimers [rtimercnt];
601 downheap (rtimers, rtimercnt, w->active - 1);
602 }
603 }
604 2401
605 ev_stop ((struct ev_watcher *)w); 2402 wlist_del (&signals [w->signum - 1].head, (WL)w);
606} 2403 ev_stop (EV_A_ (W)w);
607
608void
609evsignal_start (struct ev_signal *w)
610{
611 if (ev_is_active (w))
612 return;
613
614 ev_start ((struct ev_watcher *)w, 1);
615 array_needsize (signals, signalmax, w->signum, signals_init);
616 wlist_add ((struct ev_watcher_list **)&signals [w->signum - 1].head, (struct ev_watcher_list *)w);
617
618 if (!w->next)
619 {
620 struct sigaction sa;
621 sa.sa_handler = sighandler;
622 sigfillset (&sa.sa_mask);
623 sa.sa_flags = 0;
624 sigaction (w->signum, &sa, 0);
625 }
626}
627
628void
629evsignal_stop (struct ev_signal *w)
630{
631 if (!ev_is_active (w))
632 return;
633
634 wlist_del ((struct ev_watcher_list **)&signals [w->signum - 1].head, (struct ev_watcher_list *)w);
635 ev_stop ((struct ev_watcher *)w);
636 2404
637 if (!signals [w->signum - 1].head) 2405 if (!signals [w->signum - 1].head)
638 signal (w->signum, SIG_DFL); 2406 signal (w->signum, SIG_DFL);
2407
2408 EV_FREQUENT_CHECK;
639} 2409}
2410
2411void
2412ev_child_start (EV_P_ ev_child *w)
2413{
2414#if EV_MULTIPLICITY
2415 assert (("libev: child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
2416#endif
2417 if (expect_false (ev_is_active (w)))
2418 return;
2419
2420 EV_FREQUENT_CHECK;
2421
2422 ev_start (EV_A_ (W)w, 1);
2423 wlist_add (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
2424
2425 EV_FREQUENT_CHECK;
2426}
2427
2428void
2429ev_child_stop (EV_P_ ev_child *w)
2430{
2431 clear_pending (EV_A_ (W)w);
2432 if (expect_false (!ev_is_active (w)))
2433 return;
2434
2435 EV_FREQUENT_CHECK;
2436
2437 wlist_del (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
2438 ev_stop (EV_A_ (W)w);
2439
2440 EV_FREQUENT_CHECK;
2441}
2442
2443#if EV_STAT_ENABLE
2444
2445# ifdef _WIN32
2446# undef lstat
2447# define lstat(a,b) _stati64 (a,b)
2448# endif
2449
2450#define DEF_STAT_INTERVAL 5.0074891
2451#define NFS_STAT_INTERVAL 30.1074891 /* for filesystems potentially failing inotify */
2452#define MIN_STAT_INTERVAL 0.1074891
2453
2454static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
2455
2456#if EV_USE_INOTIFY
2457# define EV_INOTIFY_BUFSIZE 8192
2458
2459static void noinline
2460infy_add (EV_P_ ev_stat *w)
2461{
2462 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);
2463
2464 if (w->wd < 0)
2465 {
2466 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
2467 ev_timer_again (EV_A_ &w->timer); /* this is not race-free, so we still need to recheck periodically */
2468
2469 /* monitor some parent directory for speedup hints */
2470 /* note that exceeding the hardcoded path limit is not a correctness issue, */
2471 /* but an efficiency issue only */
2472 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
2473 {
2474 char path [4096];
2475 strcpy (path, w->path);
2476
2477 do
2478 {
2479 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
2480 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
2481
2482 char *pend = strrchr (path, '/');
2483
2484 if (!pend || pend == path)
2485 break;
2486
2487 *pend = 0;
2488 w->wd = inotify_add_watch (fs_fd, path, mask);
2489 }
2490 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
2491 }
2492 }
2493
2494 if (w->wd >= 0)
2495 {
2496 wlist_add (&fs_hash [w->wd & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
2497
2498 /* now local changes will be tracked by inotify, but remote changes won't */
2499 /* unless the filesystem it known to be local, we therefore still poll */
2500 /* also do poll on <2.6.25, but with normal frequency */
2501 struct statfs sfs;
2502
2503 if (fs_2625 && !statfs (w->path, &sfs))
2504 if (sfs.f_type == 0x1373 /* devfs */
2505 || sfs.f_type == 0xEF53 /* ext2/3 */
2506 || sfs.f_type == 0x3153464a /* jfs */
2507 || sfs.f_type == 0x52654973 /* reiser3 */
2508 || sfs.f_type == 0x01021994 /* tempfs */
2509 || sfs.f_type == 0x58465342 /* xfs */)
2510 return;
2511
2512 w->timer.repeat = w->interval ? w->interval : fs_2625 ? NFS_STAT_INTERVAL : DEF_STAT_INTERVAL;
2513 ev_timer_again (EV_A_ &w->timer);
2514 }
2515}
2516
2517static void noinline
2518infy_del (EV_P_ ev_stat *w)
2519{
2520 int slot;
2521 int wd = w->wd;
2522
2523 if (wd < 0)
2524 return;
2525
2526 w->wd = -2;
2527 slot = wd & (EV_INOTIFY_HASHSIZE - 1);
2528 wlist_del (&fs_hash [slot].head, (WL)w);
2529
2530 /* remove this watcher, if others are watching it, they will rearm */
2531 inotify_rm_watch (fs_fd, wd);
2532}
2533
2534static void noinline
2535infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
2536{
2537 if (slot < 0)
2538 /* overflow, need to check for all hash slots */
2539 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
2540 infy_wd (EV_A_ slot, wd, ev);
2541 else
2542 {
2543 WL w_;
2544
2545 for (w_ = fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head; w_; )
2546 {
2547 ev_stat *w = (ev_stat *)w_;
2548 w_ = w_->next; /* lets us remove this watcher and all before it */
2549
2550 if (w->wd == wd || wd == -1)
2551 {
2552 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
2553 {
2554 wlist_del (&fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
2555 w->wd = -1;
2556 infy_add (EV_A_ w); /* re-add, no matter what */
2557 }
2558
2559 stat_timer_cb (EV_A_ &w->timer, 0);
2560 }
2561 }
2562 }
2563}
2564
2565static void
2566infy_cb (EV_P_ ev_io *w, int revents)
2567{
2568 char buf [EV_INOTIFY_BUFSIZE];
2569 struct inotify_event *ev = (struct inotify_event *)buf;
2570 int ofs;
2571 int len = read (fs_fd, buf, sizeof (buf));
2572
2573 for (ofs = 0; ofs < len; ofs += sizeof (struct inotify_event) + ev->len)
2574 infy_wd (EV_A_ ev->wd, ev->wd, ev);
2575}
2576
2577void inline_size
2578check_2625 (EV_P)
2579{
2580 /* kernels < 2.6.25 are borked
2581 * http://www.ussg.indiana.edu/hypermail/linux/kernel/0711.3/1208.html
2582 */
2583 struct utsname buf;
2584 int major, minor, micro;
2585
2586 if (uname (&buf))
2587 return;
2588
2589 if (sscanf (buf.release, "%d.%d.%d", &major, &minor, &micro) != 3)
2590 return;
2591
2592 if (major < 2
2593 || (major == 2 && minor < 6)
2594 || (major == 2 && minor == 6 && micro < 25))
2595 return;
2596
2597 fs_2625 = 1;
2598}
2599
2600void inline_size
2601infy_init (EV_P)
2602{
2603 if (fs_fd != -2)
2604 return;
2605
2606 fs_fd = -1;
2607
2608 check_2625 (EV_A);
2609
2610 fs_fd = inotify_init ();
2611
2612 if (fs_fd >= 0)
2613 {
2614 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
2615 ev_set_priority (&fs_w, EV_MAXPRI);
2616 ev_io_start (EV_A_ &fs_w);
2617 }
2618}
2619
2620void inline_size
2621infy_fork (EV_P)
2622{
2623 int slot;
2624
2625 if (fs_fd < 0)
2626 return;
2627
2628 close (fs_fd);
2629 fs_fd = inotify_init ();
2630
2631 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
2632 {
2633 WL w_ = fs_hash [slot].head;
2634 fs_hash [slot].head = 0;
2635
2636 while (w_)
2637 {
2638 ev_stat *w = (ev_stat *)w_;
2639 w_ = w_->next; /* lets us add this watcher */
2640
2641 w->wd = -1;
2642
2643 if (fs_fd >= 0)
2644 infy_add (EV_A_ w); /* re-add, no matter what */
2645 else
2646 ev_timer_again (EV_A_ &w->timer);
2647 }
2648 }
2649}
2650
2651#endif
2652
2653#ifdef _WIN32
2654# define EV_LSTAT(p,b) _stati64 (p, b)
2655#else
2656# define EV_LSTAT(p,b) lstat (p, b)
2657#endif
2658
2659void
2660ev_stat_stat (EV_P_ ev_stat *w)
2661{
2662 if (lstat (w->path, &w->attr) < 0)
2663 w->attr.st_nlink = 0;
2664 else if (!w->attr.st_nlink)
2665 w->attr.st_nlink = 1;
2666}
2667
2668static void noinline
2669stat_timer_cb (EV_P_ ev_timer *w_, int revents)
2670{
2671 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
2672
2673 /* we copy this here each the time so that */
2674 /* prev has the old value when the callback gets invoked */
2675 w->prev = w->attr;
2676 ev_stat_stat (EV_A_ w);
2677
2678 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
2679 if (
2680 w->prev.st_dev != w->attr.st_dev
2681 || w->prev.st_ino != w->attr.st_ino
2682 || w->prev.st_mode != w->attr.st_mode
2683 || w->prev.st_nlink != w->attr.st_nlink
2684 || w->prev.st_uid != w->attr.st_uid
2685 || w->prev.st_gid != w->attr.st_gid
2686 || w->prev.st_rdev != w->attr.st_rdev
2687 || w->prev.st_size != w->attr.st_size
2688 || w->prev.st_atime != w->attr.st_atime
2689 || w->prev.st_mtime != w->attr.st_mtime
2690 || w->prev.st_ctime != w->attr.st_ctime
2691 ) {
2692 #if EV_USE_INOTIFY
2693 if (fs_fd >= 0)
2694 {
2695 infy_del (EV_A_ w);
2696 infy_add (EV_A_ w);
2697 ev_stat_stat (EV_A_ w); /* avoid race... */
2698 }
2699 #endif
2700
2701 ev_feed_event (EV_A_ w, EV_STAT);
2702 }
2703}
2704
2705void
2706ev_stat_start (EV_P_ ev_stat *w)
2707{
2708 if (expect_false (ev_is_active (w)))
2709 return;
2710
2711 ev_stat_stat (EV_A_ w);
2712
2713 if (w->interval < MIN_STAT_INTERVAL && w->interval)
2714 w->interval = MIN_STAT_INTERVAL;
2715
2716 ev_timer_init (&w->timer, stat_timer_cb, 0., w->interval ? w->interval : DEF_STAT_INTERVAL);
2717 ev_set_priority (&w->timer, ev_priority (w));
2718
2719#if EV_USE_INOTIFY
2720 infy_init (EV_A);
2721
2722 if (fs_fd >= 0)
2723 infy_add (EV_A_ w);
2724 else
2725#endif
2726 ev_timer_again (EV_A_ &w->timer);
2727
2728 ev_start (EV_A_ (W)w, 1);
2729
2730 EV_FREQUENT_CHECK;
2731}
2732
2733void
2734ev_stat_stop (EV_P_ ev_stat *w)
2735{
2736 clear_pending (EV_A_ (W)w);
2737 if (expect_false (!ev_is_active (w)))
2738 return;
2739
2740 EV_FREQUENT_CHECK;
2741
2742#if EV_USE_INOTIFY
2743 infy_del (EV_A_ w);
2744#endif
2745 ev_timer_stop (EV_A_ &w->timer);
2746
2747 ev_stop (EV_A_ (W)w);
2748
2749 EV_FREQUENT_CHECK;
2750}
2751#endif
2752
2753#if EV_IDLE_ENABLE
2754void
2755ev_idle_start (EV_P_ ev_idle *w)
2756{
2757 if (expect_false (ev_is_active (w)))
2758 return;
2759
2760 pri_adjust (EV_A_ (W)w);
2761
2762 EV_FREQUENT_CHECK;
2763
2764 {
2765 int active = ++idlecnt [ABSPRI (w)];
2766
2767 ++idleall;
2768 ev_start (EV_A_ (W)w, active);
2769
2770 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
2771 idles [ABSPRI (w)][active - 1] = w;
2772 }
2773
2774 EV_FREQUENT_CHECK;
2775}
2776
2777void
2778ev_idle_stop (EV_P_ ev_idle *w)
2779{
2780 clear_pending (EV_A_ (W)w);
2781 if (expect_false (!ev_is_active (w)))
2782 return;
2783
2784 EV_FREQUENT_CHECK;
2785
2786 {
2787 int active = ev_active (w);
2788
2789 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
2790 ev_active (idles [ABSPRI (w)][active - 1]) = active;
2791
2792 ev_stop (EV_A_ (W)w);
2793 --idleall;
2794 }
2795
2796 EV_FREQUENT_CHECK;
2797}
2798#endif
2799
2800void
2801ev_prepare_start (EV_P_ ev_prepare *w)
2802{
2803 if (expect_false (ev_is_active (w)))
2804 return;
2805
2806 EV_FREQUENT_CHECK;
2807
2808 ev_start (EV_A_ (W)w, ++preparecnt);
2809 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
2810 prepares [preparecnt - 1] = w;
2811
2812 EV_FREQUENT_CHECK;
2813}
2814
2815void
2816ev_prepare_stop (EV_P_ ev_prepare *w)
2817{
2818 clear_pending (EV_A_ (W)w);
2819 if (expect_false (!ev_is_active (w)))
2820 return;
2821
2822 EV_FREQUENT_CHECK;
2823
2824 {
2825 int active = ev_active (w);
2826
2827 prepares [active - 1] = prepares [--preparecnt];
2828 ev_active (prepares [active - 1]) = active;
2829 }
2830
2831 ev_stop (EV_A_ (W)w);
2832
2833 EV_FREQUENT_CHECK;
2834}
2835
2836void
2837ev_check_start (EV_P_ ev_check *w)
2838{
2839 if (expect_false (ev_is_active (w)))
2840 return;
2841
2842 EV_FREQUENT_CHECK;
2843
2844 ev_start (EV_A_ (W)w, ++checkcnt);
2845 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
2846 checks [checkcnt - 1] = w;
2847
2848 EV_FREQUENT_CHECK;
2849}
2850
2851void
2852ev_check_stop (EV_P_ ev_check *w)
2853{
2854 clear_pending (EV_A_ (W)w);
2855 if (expect_false (!ev_is_active (w)))
2856 return;
2857
2858 EV_FREQUENT_CHECK;
2859
2860 {
2861 int active = ev_active (w);
2862
2863 checks [active - 1] = checks [--checkcnt];
2864 ev_active (checks [active - 1]) = active;
2865 }
2866
2867 ev_stop (EV_A_ (W)w);
2868
2869 EV_FREQUENT_CHECK;
2870}
2871
2872#if EV_EMBED_ENABLE
2873void noinline
2874ev_embed_sweep (EV_P_ ev_embed *w)
2875{
2876 ev_loop (w->other, EVLOOP_NONBLOCK);
2877}
2878
2879static void
2880embed_io_cb (EV_P_ ev_io *io, int revents)
2881{
2882 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
2883
2884 if (ev_cb (w))
2885 ev_feed_event (EV_A_ (W)w, EV_EMBED);
2886 else
2887 ev_loop (w->other, EVLOOP_NONBLOCK);
2888}
2889
2890static void
2891embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
2892{
2893 ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
2894
2895 {
2896 struct ev_loop *loop = w->other;
2897
2898 while (fdchangecnt)
2899 {
2900 fd_reify (EV_A);
2901 ev_loop (EV_A_ EVLOOP_NONBLOCK);
2902 }
2903 }
2904}
2905
2906static void
2907embed_fork_cb (EV_P_ ev_fork *fork_w, int revents)
2908{
2909 ev_embed *w = (ev_embed *)(((char *)fork_w) - offsetof (ev_embed, fork));
2910
2911 ev_embed_stop (EV_A_ w);
2912
2913 {
2914 struct ev_loop *loop = w->other;
2915
2916 ev_loop_fork (EV_A);
2917 ev_loop (EV_A_ EVLOOP_NONBLOCK);
2918 }
2919
2920 ev_embed_start (EV_A_ w);
2921}
2922
2923#if 0
2924static void
2925embed_idle_cb (EV_P_ ev_idle *idle, int revents)
2926{
2927 ev_idle_stop (EV_A_ idle);
2928}
2929#endif
2930
2931void
2932ev_embed_start (EV_P_ ev_embed *w)
2933{
2934 if (expect_false (ev_is_active (w)))
2935 return;
2936
2937 {
2938 struct ev_loop *loop = w->other;
2939 assert (("libev: loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
2940 ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
2941 }
2942
2943 EV_FREQUENT_CHECK;
2944
2945 ev_set_priority (&w->io, ev_priority (w));
2946 ev_io_start (EV_A_ &w->io);
2947
2948 ev_prepare_init (&w->prepare, embed_prepare_cb);
2949 ev_set_priority (&w->prepare, EV_MINPRI);
2950 ev_prepare_start (EV_A_ &w->prepare);
2951
2952 ev_fork_init (&w->fork, embed_fork_cb);
2953 ev_fork_start (EV_A_ &w->fork);
2954
2955 /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
2956
2957 ev_start (EV_A_ (W)w, 1);
2958
2959 EV_FREQUENT_CHECK;
2960}
2961
2962void
2963ev_embed_stop (EV_P_ ev_embed *w)
2964{
2965 clear_pending (EV_A_ (W)w);
2966 if (expect_false (!ev_is_active (w)))
2967 return;
2968
2969 EV_FREQUENT_CHECK;
2970
2971 ev_io_stop (EV_A_ &w->io);
2972 ev_prepare_stop (EV_A_ &w->prepare);
2973 ev_fork_stop (EV_A_ &w->fork);
2974
2975 EV_FREQUENT_CHECK;
2976}
2977#endif
2978
2979#if EV_FORK_ENABLE
2980void
2981ev_fork_start (EV_P_ ev_fork *w)
2982{
2983 if (expect_false (ev_is_active (w)))
2984 return;
2985
2986 EV_FREQUENT_CHECK;
2987
2988 ev_start (EV_A_ (W)w, ++forkcnt);
2989 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
2990 forks [forkcnt - 1] = w;
2991
2992 EV_FREQUENT_CHECK;
2993}
2994
2995void
2996ev_fork_stop (EV_P_ ev_fork *w)
2997{
2998 clear_pending (EV_A_ (W)w);
2999 if (expect_false (!ev_is_active (w)))
3000 return;
3001
3002 EV_FREQUENT_CHECK;
3003
3004 {
3005 int active = ev_active (w);
3006
3007 forks [active - 1] = forks [--forkcnt];
3008 ev_active (forks [active - 1]) = active;
3009 }
3010
3011 ev_stop (EV_A_ (W)w);
3012
3013 EV_FREQUENT_CHECK;
3014}
3015#endif
3016
3017#if EV_ASYNC_ENABLE
3018void
3019ev_async_start (EV_P_ ev_async *w)
3020{
3021 if (expect_false (ev_is_active (w)))
3022 return;
3023
3024 evpipe_init (EV_A);
3025
3026 EV_FREQUENT_CHECK;
3027
3028 ev_start (EV_A_ (W)w, ++asynccnt);
3029 array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
3030 asyncs [asynccnt - 1] = w;
3031
3032 EV_FREQUENT_CHECK;
3033}
3034
3035void
3036ev_async_stop (EV_P_ ev_async *w)
3037{
3038 clear_pending (EV_A_ (W)w);
3039 if (expect_false (!ev_is_active (w)))
3040 return;
3041
3042 EV_FREQUENT_CHECK;
3043
3044 {
3045 int active = ev_active (w);
3046
3047 asyncs [active - 1] = asyncs [--asynccnt];
3048 ev_active (asyncs [active - 1]) = active;
3049 }
3050
3051 ev_stop (EV_A_ (W)w);
3052
3053 EV_FREQUENT_CHECK;
3054}
3055
3056void
3057ev_async_send (EV_P_ ev_async *w)
3058{
3059 w->sent = 1;
3060 evpipe_write (EV_A_ &gotasync);
3061}
3062#endif
640 3063
641/*****************************************************************************/ 3064/*****************************************************************************/
642#if 1 3065
3066struct ev_once
3067{
3068 ev_io io;
3069 ev_timer to;
3070 void (*cb)(int revents, void *arg);
3071 void *arg;
3072};
643 3073
644static void 3074static void
645sin_cb (struct ev_io *w, int revents) 3075once_cb (EV_P_ struct ev_once *once, int revents)
646{ 3076{
647 fprintf (stderr, "sin %d, revents %d\n", w->fd, revents); 3077 void (*cb)(int revents, void *arg) = once->cb;
3078 void *arg = once->arg;
3079
3080 ev_io_stop (EV_A_ &once->io);
3081 ev_timer_stop (EV_A_ &once->to);
3082 ev_free (once);
3083
3084 cb (revents, arg);
648} 3085}
649 3086
650static void 3087static void
651ocb (struct ev_timer *w, int revents) 3088once_cb_io (EV_P_ ev_io *w, int revents)
652{ 3089{
653 //fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data); 3090 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io));
654 evtimer_stop (w); 3091
655 evtimer_start (w); 3092 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->to));
656} 3093}
657 3094
658static void 3095static void
659scb (struct ev_signal *w, int revents) 3096once_cb_to (EV_P_ ev_timer *w, int revents)
660{ 3097{
661 fprintf (stderr, "signal %x,%d\n", revents, w->signum); 3098 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to));
662}
663 3099
664int main (void) 3100 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->io));
665{ 3101}
666 struct ev_io sin;
667 3102
668 ev_init (0); 3103void
3104ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
3105{
3106 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
669 3107
670 evw_init (&sin, sin_cb, 55); 3108 if (expect_false (!once))
671 evio_set (&sin, 0, EV_READ);
672 evio_start (&sin);
673
674 struct ev_timer t[10000];
675
676#if 0
677 int i;
678 for (i = 0; i < 10000; ++i)
679 {
680 struct ev_timer *w = t + i;
681 evw_init (w, ocb, i);
682 evtimer_set_abs (w, drand48 (), 0.99775533);
683 evtimer_start (w);
684 if (drand48 () < 0.5)
685 evtimer_stop (w);
686 } 3109 {
687#endif 3110 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
688
689 struct ev_timer t1;
690 evw_init (&t1, ocb, 0);
691 evtimer_set_abs (&t1, 5, 10);
692 evtimer_start (&t1);
693
694 struct ev_signal sig;
695 evw_init (&sig, scb, 65535);
696 evsignal_set (&sig, SIGQUIT);
697 evsignal_start (&sig);
698
699 ev_loop (0);
700
701 return 0; 3111 return;
702} 3112 }
703 3113
704#endif 3114 once->cb = cb;
3115 once->arg = arg;
705 3116
3117 ev_init (&once->io, once_cb_io);
3118 if (fd >= 0)
3119 {
3120 ev_io_set (&once->io, fd, events);
3121 ev_io_start (EV_A_ &once->io);
3122 }
706 3123
3124 ev_init (&once->to, once_cb_to);
3125 if (timeout >= 0.)
3126 {
3127 ev_timer_set (&once->to, timeout, 0.);
3128 ev_timer_start (EV_A_ &once->to);
3129 }
3130}
707 3131
3132#if EV_MULTIPLICITY
3133 #include "ev_wrap.h"
3134#endif
708 3135
3136#ifdef __cplusplus
3137}
3138#endif
3139

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