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Comparing libev/ev.c (file contents):
Revision 1.5 by root, Tue Oct 30 23:54:38 2007 UTC vs.
Revision 1.291 by root, Mon Jun 29 04:44:18 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# elif !defined(EV_USE_CLOCK_SYSCALL)
63# define EV_USE_CLOCK_SYSCALL 0
64# endif
65
66# if HAVE_CLOCK_GETTIME
67# ifndef EV_USE_MONOTONIC
68# define EV_USE_MONOTONIC 1
69# endif
70# ifndef EV_USE_REALTIME
71# define EV_USE_REALTIME 0
72# endif
73# else
74# ifndef EV_USE_MONOTONIC
75# define EV_USE_MONOTONIC 0
76# endif
77# ifndef EV_USE_REALTIME
78# define EV_USE_REALTIME 0
79# endif
80# endif
81
82# ifndef EV_USE_NANOSLEEP
83# if HAVE_NANOSLEEP
84# define EV_USE_NANOSLEEP 1
85# else
86# define EV_USE_NANOSLEEP 0
87# endif
88# endif
89
90# ifndef EV_USE_SELECT
91# if HAVE_SELECT && HAVE_SYS_SELECT_H
92# define EV_USE_SELECT 1
93# else
94# define EV_USE_SELECT 0
95# endif
96# endif
97
98# ifndef EV_USE_POLL
99# if HAVE_POLL && HAVE_POLL_H
100# define EV_USE_POLL 1
101# else
102# define EV_USE_POLL 0
103# endif
104# endif
105
106# ifndef EV_USE_EPOLL
107# if HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
108# define EV_USE_EPOLL 1
109# else
110# define EV_USE_EPOLL 0
111# endif
112# endif
113
114# ifndef EV_USE_KQUEUE
115# if HAVE_KQUEUE && HAVE_SYS_EVENT_H && HAVE_SYS_QUEUE_H
116# define EV_USE_KQUEUE 1
117# else
118# define EV_USE_KQUEUE 0
119# endif
120# endif
121
122# ifndef EV_USE_PORT
123# if HAVE_PORT_H && HAVE_PORT_CREATE
124# define EV_USE_PORT 1
125# else
126# define EV_USE_PORT 0
127# endif
128# endif
129
130# ifndef EV_USE_INOTIFY
131# if HAVE_INOTIFY_INIT && HAVE_SYS_INOTIFY_H
132# define EV_USE_INOTIFY 1
133# else
134# define EV_USE_INOTIFY 0
135# endif
136# endif
137
138# ifndef EV_USE_EVENTFD
139# if HAVE_EVENTFD
140# define EV_USE_EVENTFD 1
141# else
142# define EV_USE_EVENTFD 0
143# endif
144# endif
145
146#endif
147
1#include <math.h> 148#include <math.h>
2#include <stdlib.h> 149#include <stdlib.h>
150#include <fcntl.h>
151#include <stddef.h>
3 152
4#include <stdio.h> 153#include <stdio.h>
5 154
6#include <assert.h> 155#include <assert.h>
7#include <errno.h> 156#include <errno.h>
8#include <sys/time.h> 157#include <sys/types.h>
9#include <time.h> 158#include <time.h>
10 159
160#include <signal.h>
161
162#ifdef EV_H
163# include EV_H
164#else
165# include "ev.h"
166#endif
167
168#ifndef _WIN32
169# include <sys/time.h>
170# include <sys/wait.h>
171# include <unistd.h>
172#else
173# include <io.h>
174# define WIN32_LEAN_AND_MEAN
175# include <windows.h>
176# ifndef EV_SELECT_IS_WINSOCKET
177# define EV_SELECT_IS_WINSOCKET 1
178# endif
179#endif
180
181/* this block tries to deduce configuration from header-defined symbols and defaults */
182
183#ifndef EV_USE_CLOCK_SYSCALL
184# if __linux && __GLIBC__ >= 2
185# define EV_USE_CLOCK_SYSCALL 1
186# else
187# define EV_USE_CLOCK_SYSCALL 0
188# endif
189#endif
190
191#ifndef EV_USE_MONOTONIC
192# if defined (_POSIX_MONOTONIC_CLOCK) && _POSIX_MONOTONIC_CLOCK >= 0
193# define EV_USE_MONOTONIC 1
194# else
195# define EV_USE_MONOTONIC 0
196# endif
197#endif
198
199#ifndef EV_USE_REALTIME
200# define EV_USE_REALTIME !EV_USE_CLOCK_SYSCALL
201#endif
202
203#ifndef EV_USE_NANOSLEEP
204# if _POSIX_C_SOURCE >= 199309L
205# define EV_USE_NANOSLEEP 1
206# else
207# define EV_USE_NANOSLEEP 0
208# endif
209#endif
210
211#ifndef EV_USE_SELECT
212# define EV_USE_SELECT 1
213#endif
214
215#ifndef EV_USE_POLL
216# ifdef _WIN32
217# define EV_USE_POLL 0
218# else
219# define EV_USE_POLL 1
220# endif
221#endif
222
223#ifndef EV_USE_EPOLL
224# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
225# define EV_USE_EPOLL 1
226# else
227# define EV_USE_EPOLL 0
228# endif
229#endif
230
231#ifndef EV_USE_KQUEUE
232# define EV_USE_KQUEUE 0
233#endif
234
235#ifndef EV_USE_PORT
236# define EV_USE_PORT 0
237#endif
238
239#ifndef EV_USE_INOTIFY
240# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
241# define EV_USE_INOTIFY 1
242# else
243# define EV_USE_INOTIFY 0
244# endif
245#endif
246
247#ifndef EV_PID_HASHSIZE
248# if EV_MINIMAL
249# define EV_PID_HASHSIZE 1
250# else
251# define EV_PID_HASHSIZE 16
252# endif
253#endif
254
255#ifndef EV_INOTIFY_HASHSIZE
256# if EV_MINIMAL
257# define EV_INOTIFY_HASHSIZE 1
258# else
259# define EV_INOTIFY_HASHSIZE 16
260# endif
261#endif
262
263#ifndef EV_USE_EVENTFD
264# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
265# define EV_USE_EVENTFD 1
266# else
267# define EV_USE_EVENTFD 0
268# endif
269#endif
270
271#if 0 /* debugging */
272# define EV_VERIFY 3
273# define EV_USE_4HEAP 1
274# define EV_HEAP_CACHE_AT 1
275#endif
276
277#ifndef EV_VERIFY
278# define EV_VERIFY !EV_MINIMAL
279#endif
280
281#ifndef EV_USE_4HEAP
282# define EV_USE_4HEAP !EV_MINIMAL
283#endif
284
285#ifndef EV_HEAP_CACHE_AT
286# define EV_HEAP_CACHE_AT !EV_MINIMAL
287#endif
288
289/* on linux, we can use a (slow) syscall to avoid a dependency on pthread, */
290/* which makes programs even slower. might work on other unices, too. */
291#if EV_USE_CLOCK_SYSCALL
292# include <syscall.h>
293# ifdef SYS_clock_gettime
294# define clock_gettime(id, ts) syscall (SYS_clock_gettime, (id), (ts))
295# undef EV_USE_MONOTONIC
296# define EV_USE_MONOTONIC 1
297# else
298# undef EV_USE_CLOCK_SYSCALL
299# define EV_USE_CLOCK_SYSCALL 0
300# endif
301#endif
302
303/* this block fixes any misconfiguration where we know we run into trouble otherwise */
304
11#ifdef CLOCK_MONOTONIC 305#ifndef CLOCK_MONOTONIC
306# undef EV_USE_MONOTONIC
12# define HAVE_MONOTONIC 1 307# define EV_USE_MONOTONIC 0
308#endif
309
310#ifndef CLOCK_REALTIME
311# undef EV_USE_REALTIME
312# define EV_USE_REALTIME 0
313#endif
314
315#if !EV_STAT_ENABLE
316# undef EV_USE_INOTIFY
317# define EV_USE_INOTIFY 0
318#endif
319
320#if !EV_USE_NANOSLEEP
321# ifndef _WIN32
322# include <sys/select.h>
13#endif 323# endif
324#endif
14 325
15#define HAVE_EPOLL 1 326#if EV_USE_INOTIFY
16#define HAVE_REALTIME 1 327# include <sys/utsname.h>
17#define HAVE_SELECT 1 328# include <sys/statfs.h>
329# include <sys/inotify.h>
330/* some very old inotify.h headers don't have IN_DONT_FOLLOW */
331# ifndef IN_DONT_FOLLOW
332# undef EV_USE_INOTIFY
333# define EV_USE_INOTIFY 0
334# endif
335#endif
336
337#if EV_SELECT_IS_WINSOCKET
338# include <winsock.h>
339#endif
340
341#if EV_USE_EVENTFD
342/* our minimum requirement is glibc 2.7 which has the stub, but not the header */
343# include <stdint.h>
344# ifdef __cplusplus
345extern "C" {
346# endif
347int eventfd (unsigned int initval, int flags);
348# ifdef __cplusplus
349}
350# endif
351#endif
352
353/**/
354
355#if EV_VERIFY >= 3
356# define EV_FREQUENT_CHECK ev_loop_verify (EV_A)
357#else
358# define EV_FREQUENT_CHECK do { } while (0)
359#endif
360
361/*
362 * This is used to avoid floating point rounding problems.
363 * It is added to ev_rt_now when scheduling periodics
364 * to ensure progress, time-wise, even when rounding
365 * errors are against us.
366 * This value is good at least till the year 4000.
367 * Better solutions welcome.
368 */
369#define TIME_EPSILON 0.0001220703125 /* 1/8192 */
18 370
19#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */ 371#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
20#define MAX_BLOCKTIME 60. 372#define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
373/*#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds, TODO */
21 374
375#if __GNUC__ >= 4
376# define expect(expr,value) __builtin_expect ((expr),(value))
377# define noinline __attribute__ ((noinline))
378#else
379# define expect(expr,value) (expr)
380# define noinline
381# if __STDC_VERSION__ < 199901L && __GNUC__ < 2
382# define inline
383# endif
384#endif
385
386#define expect_false(expr) expect ((expr) != 0, 0)
387#define expect_true(expr) expect ((expr) != 0, 1)
388#define inline_size static inline
389
390#if EV_MINIMAL
391# define inline_speed static noinline
392#else
393# define inline_speed static inline
394#endif
395
396#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
397#define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
398
399#define EMPTY /* required for microsofts broken pseudo-c compiler */
400#define EMPTY2(a,b) /* used to suppress some warnings */
401
402typedef ev_watcher *W;
403typedef ev_watcher_list *WL;
404typedef ev_watcher_time *WT;
405
406#define ev_active(w) ((W)(w))->active
407#define ev_at(w) ((WT)(w))->at
408
409#if EV_USE_REALTIME
410/* sig_atomic_t is used to avoid per-thread variables or locking but still */
411/* giving it a reasonably high chance of working on typical architetcures */
412static EV_ATOMIC_T have_realtime; /* did clock_gettime (CLOCK_REALTIME) work? */
413#endif
414
415#if EV_USE_MONOTONIC
416static EV_ATOMIC_T have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
417#endif
418
419#ifdef _WIN32
420# include "ev_win32.c"
421#endif
422
423/*****************************************************************************/
424
425static void (*syserr_cb)(const char *msg);
426
427void
428ev_set_syserr_cb (void (*cb)(const char *msg))
429{
430 syserr_cb = cb;
431}
432
433static void noinline
434ev_syserr (const char *msg)
435{
436 if (!msg)
437 msg = "(libev) system error";
438
439 if (syserr_cb)
440 syserr_cb (msg);
441 else
442 {
443 perror (msg);
444 abort ();
445 }
446}
447
448static void *
449ev_realloc_emul (void *ptr, long size)
450{
451 /* some systems, notably openbsd and darwin, fail to properly
452 * implement realloc (x, 0) (as required by both ansi c-98 and
453 * the single unix specification, so work around them here.
454 */
455
456 if (size)
457 return realloc (ptr, size);
458
459 free (ptr);
460 return 0;
461}
462
463static void *(*alloc)(void *ptr, long size) = ev_realloc_emul;
464
465void
466ev_set_allocator (void *(*cb)(void *ptr, long size))
467{
468 alloc = cb;
469}
470
471inline_speed void *
472ev_realloc (void *ptr, long size)
473{
474 ptr = alloc (ptr, size);
475
476 if (!ptr && size)
477 {
478 fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
479 abort ();
480 }
481
482 return ptr;
483}
484
485#define ev_malloc(size) ev_realloc (0, (size))
486#define ev_free(ptr) ev_realloc ((ptr), 0)
487
488/*****************************************************************************/
489
490/* file descriptor info structure */
491typedef struct
492{
493 WL head;
494 unsigned char events; /* the events watched for */
495 unsigned char reify; /* flag set when this ANFD needs reification */
496 unsigned char emask; /* the epoll backend stores the actual kernel mask in here */
497 unsigned char unused;
498#if EV_USE_EPOLL
499 unsigned int egen; /* generation counter to counter epoll bugs */
500#endif
501#if EV_SELECT_IS_WINSOCKET
502 SOCKET handle;
503#endif
504} ANFD;
505
506/* stores the pending event set for a given watcher */
507typedef struct
508{
509 W w;
510 int events; /* the pending event set for the given watcher */
511} ANPENDING;
512
513#if EV_USE_INOTIFY
514/* hash table entry per inotify-id */
515typedef struct
516{
517 WL head;
518} ANFS;
519#endif
520
521/* Heap Entry */
522#if EV_HEAP_CACHE_AT
523 /* a heap element */
524 typedef struct {
525 ev_tstamp at;
526 WT w;
527 } ANHE;
528
529 #define ANHE_w(he) (he).w /* access watcher, read-write */
530 #define ANHE_at(he) (he).at /* access cached at, read-only */
531 #define ANHE_at_cache(he) (he).at = (he).w->at /* update at from watcher */
532#else
533 /* a heap element */
534 typedef WT ANHE;
535
536 #define ANHE_w(he) (he)
537 #define ANHE_at(he) (he)->at
538 #define ANHE_at_cache(he)
539#endif
540
541#if EV_MULTIPLICITY
542
543 struct ev_loop
544 {
545 ev_tstamp ev_rt_now;
546 #define ev_rt_now ((loop)->ev_rt_now)
547 #define VAR(name,decl) decl;
548 #include "ev_vars.h"
549 #undef VAR
550 };
22#include "ev.h" 551 #include "ev_wrap.h"
23 552
24struct ev_watcher { 553 static struct ev_loop default_loop_struct;
25 EV_WATCHER (ev_watcher); 554 struct ev_loop *ev_default_loop_ptr;
26};
27 555
28struct ev_watcher_list { 556#else
29 EV_WATCHER_LIST (ev_watcher_list);
30};
31 557
32static ev_tstamp now, diff; /* monotonic clock */
33ev_tstamp ev_now; 558 ev_tstamp ev_rt_now;
34int ev_method; 559 #define VAR(name,decl) static decl;
560 #include "ev_vars.h"
561 #undef VAR
35 562
36static int have_monotonic; /* runtime */ 563 static int ev_default_loop_ptr;
37 564
38static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */ 565#endif
39static void (*method_modify)(int fd, int oev, int nev); 566
40static void (*method_poll)(ev_tstamp timeout); 567/*****************************************************************************/
41 568
42ev_tstamp 569ev_tstamp
43ev_time (void) 570ev_time (void)
44{ 571{
45#if HAVE_REALTIME 572#if EV_USE_REALTIME
573 if (expect_true (have_realtime))
574 {
46 struct timespec ts; 575 struct timespec ts;
47 clock_gettime (CLOCK_REALTIME, &ts); 576 clock_gettime (CLOCK_REALTIME, &ts);
48 return ts.tv_sec + ts.tv_nsec * 1e-9; 577 return ts.tv_sec + ts.tv_nsec * 1e-9;
49#else 578 }
579#endif
580
50 struct timeval tv; 581 struct timeval tv;
51 gettimeofday (&tv, 0); 582 gettimeofday (&tv, 0);
52 return tv.tv_sec + tv.tv_usec * 1e-6; 583 return tv.tv_sec + tv.tv_usec * 1e-6;
53#endif
54} 584}
55 585
56static ev_tstamp 586inline_size ev_tstamp
57get_clock (void) 587get_clock (void)
58{ 588{
59#if HAVE_MONOTONIC 589#if EV_USE_MONOTONIC
60 if (have_monotonic) 590 if (expect_true (have_monotonic))
61 { 591 {
62 struct timespec ts; 592 struct timespec ts;
63 clock_gettime (CLOCK_MONOTONIC, &ts); 593 clock_gettime (CLOCK_MONOTONIC, &ts);
64 return ts.tv_sec + ts.tv_nsec * 1e-9; 594 return ts.tv_sec + ts.tv_nsec * 1e-9;
65 } 595 }
66#endif 596#endif
67 597
68 return ev_time (); 598 return ev_time ();
69} 599}
70 600
601#if EV_MULTIPLICITY
602ev_tstamp
603ev_now (EV_P)
604{
605 return ev_rt_now;
606}
607#endif
608
609void
610ev_sleep (ev_tstamp delay)
611{
612 if (delay > 0.)
613 {
614#if EV_USE_NANOSLEEP
615 struct timespec ts;
616
617 ts.tv_sec = (time_t)delay;
618 ts.tv_nsec = (long)((delay - (ev_tstamp)(ts.tv_sec)) * 1e9);
619
620 nanosleep (&ts, 0);
621#elif defined(_WIN32)
622 Sleep ((unsigned long)(delay * 1e3));
623#else
624 struct timeval tv;
625
626 tv.tv_sec = (time_t)delay;
627 tv.tv_usec = (long)((delay - (ev_tstamp)(tv.tv_sec)) * 1e6);
628
629 /* here we rely on sys/time.h + sys/types.h + unistd.h providing select */
630 /* somehting nto guaranteed by newer posix versions, but guaranteed */
631 /* by older ones */
632 select (0, 0, 0, 0, &tv);
633#endif
634 }
635}
636
637/*****************************************************************************/
638
639#define MALLOC_ROUND 4096 /* prefer to allocate in chunks of this size, must be 2**n and >> 4 longs */
640
641/* find a suitable new size for the given array, */
642/* hopefully by rounding to a ncie-to-malloc size */
643inline_size int
644array_nextsize (int elem, int cur, int cnt)
645{
646 int ncur = cur + 1;
647
648 do
649 ncur <<= 1;
650 while (cnt > ncur);
651
652 /* if size is large, round to MALLOC_ROUND - 4 * longs to accomodate malloc overhead */
653 if (elem * ncur > MALLOC_ROUND - sizeof (void *) * 4)
654 {
655 ncur *= elem;
656 ncur = (ncur + elem + (MALLOC_ROUND - 1) + sizeof (void *) * 4) & ~(MALLOC_ROUND - 1);
657 ncur = ncur - sizeof (void *) * 4;
658 ncur /= elem;
659 }
660
661 return ncur;
662}
663
664static noinline void *
665array_realloc (int elem, void *base, int *cur, int cnt)
666{
667 *cur = array_nextsize (elem, *cur, cnt);
668 return ev_realloc (base, elem * *cur);
669}
670
671#define array_init_zero(base,count) \
672 memset ((void *)(base), 0, sizeof (*(base)) * (count))
673
71#define array_needsize(base,cur,cnt,init) \ 674#define array_needsize(type,base,cur,cnt,init) \
72 if ((cnt) > cur) \ 675 if (expect_false ((cnt) > (cur))) \
73 { \ 676 { \
74 int newcnt = cur ? cur << 1 : 16; \ 677 int ocur_ = (cur); \
75 fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\ 678 (base) = (type *)array_realloc \
76 base = realloc (base, sizeof (*base) * (newcnt)); \ 679 (sizeof (type), (base), &(cur), (cnt)); \
77 init (base + cur, newcnt - cur); \ 680 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 { 681 }
98 base->head = 0;
99 base->wev = base->rev = EV_NONE;
100 ++base;
101 }
102}
103 682
104typedef struct 683#if 0
105{ 684#define array_slim(type,stem) \
106 struct ev_watcher *w; 685 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
107 int events; 686 { \
108} ANPENDING; 687 stem ## max = array_roundsize (stem ## cnt >> 1); \
688 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
689 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
690 }
691#endif
109 692
110static ANPENDING *pendings; 693#define array_free(stem, idx) \
111static int pendingmax, pendingcnt; 694 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0; stem ## s idx = 0
112 695
113static void 696/*****************************************************************************/
114event (struct ev_watcher *w, int events) 697
698/* dummy callback for pending events */
699static void noinline
700pendingcb (EV_P_ ev_prepare *w, int revents)
115{ 701{
116 w->pending = ++pendingcnt; 702}
117 array_needsize (pendings, pendingmax, pendingcnt, ); 703
118 pendings [pendingcnt - 1].w = w; 704void noinline
705ev_feed_event (EV_P_ void *w, int revents)
706{
707 W w_ = (W)w;
708 int pri = ABSPRI (w_);
709
710 if (expect_false (w_->pending))
119 pendings [pendingcnt - 1].events = events; 711 pendings [pri][w_->pending - 1].events |= revents;
712 else
713 {
714 w_->pending = ++pendingcnt [pri];
715 array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
716 pendings [pri][w_->pending - 1].w = w_;
717 pendings [pri][w_->pending - 1].events = revents;
718 }
120} 719}
121 720
122static void 721inline_speed void
722feed_reverse (EV_P_ W w)
723{
724 array_needsize (W, rfeeds, rfeedmax, rfeedcnt + 1, EMPTY2);
725 rfeeds [rfeedcnt++] = w;
726}
727
728inline_size void
729feed_reverse_done (EV_P_ int revents)
730{
731 do
732 ev_feed_event (EV_A_ rfeeds [--rfeedcnt], revents);
733 while (rfeedcnt);
734}
735
736inline_speed void
737queue_events (EV_P_ W *events, int eventcnt, int type)
738{
739 int i;
740
741 for (i = 0; i < eventcnt; ++i)
742 ev_feed_event (EV_A_ events [i], type);
743}
744
745/*****************************************************************************/
746
747inline_speed void
123fd_event (int fd, int events) 748fd_event (EV_P_ int fd, int revents)
124{ 749{
125 ANFD *anfd = anfds + fd; 750 ANFD *anfd = anfds + fd;
126 struct ev_io *w; 751 ev_io *w;
127 752
128 for (w = anfd->head; w; w = w->next) 753 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
129 { 754 {
130 int ev = w->events & events; 755 int ev = w->events & revents;
131 756
132 if (ev) 757 if (ev)
133 event ((struct ev_watcher *)w, ev); 758 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 { 759 }
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} 760}
159 761
160static void 762void
161downheap (struct ev_timer **timers, int N, int k) 763ev_feed_fd_event (EV_P_ int fd, int revents)
162{ 764{
163 struct ev_timer *w = timers [k]; 765 if (fd >= 0 && fd < anfdmax)
164 766 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} 767}
183 768
184static struct ev_signal **signals; 769/* make sure the external fd watch events are in-sync */
185static int signalmax; 770/* with the kernel/libev internal state */
186 771inline_size void
187static void 772fd_reify (EV_P)
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 if (ev_method == EVMETHOD_EPOLL)
240 epoll_postfork_child ();
241#endif
242}
243
244static void
245fd_reify (void)
246{ 773{
247 int i; 774 int i;
248 775
249 for (i = 0; i < fdchangecnt; ++i) 776 for (i = 0; i < fdchangecnt; ++i)
250 { 777 {
251 int fd = fdchanges [i]; 778 int fd = fdchanges [i];
252 ANFD *anfd = anfds + fd; 779 ANFD *anfd = anfds + fd;
253 struct ev_io *w; 780 ev_io *w;
254 781
255 int wev = 0; 782 unsigned char events = 0;
256 783
257 for (w = anfd->head; w; w = w->next) 784 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
258 wev |= w->events; 785 events |= (unsigned char)w->events;
259 786
260 if (anfd->wev != wev) 787#if EV_SELECT_IS_WINSOCKET
788 if (events)
261 { 789 {
262 method_modify (fd, anfd->wev, wev); 790 unsigned long arg;
263 anfd->wev = wev; 791 #ifdef EV_FD_TO_WIN32_HANDLE
792 anfd->handle = EV_FD_TO_WIN32_HANDLE (fd);
793 #else
794 anfd->handle = _get_osfhandle (fd);
795 #endif
796 assert (("libev: only socket fds supported in this configuration", ioctlsocket (anfd->handle, FIONREAD, &arg) == 0));
264 } 797 }
798#endif
799
800 {
801 unsigned char o_events = anfd->events;
802 unsigned char o_reify = anfd->reify;
803
804 anfd->reify = 0;
805 anfd->events = events;
806
807 if (o_events != events || o_reify & EV__IOFDSET)
808 backend_modify (EV_A_ fd, o_events, events);
809 }
265 } 810 }
266 811
267 fdchangecnt = 0; 812 fdchangecnt = 0;
268} 813}
269 814
270static void 815/* something about the given fd changed */
271call_pending () 816inline_size void
817fd_change (EV_P_ int fd, int flags)
272{ 818{
819 unsigned char reify = anfds [fd].reify;
820 anfds [fd].reify |= flags;
821
822 if (expect_true (!reify))
823 {
824 ++fdchangecnt;
825 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
826 fdchanges [fdchangecnt - 1] = fd;
827 }
828}
829
830/* the given fd is invalid/unusable, so make sure it doesn't hurt us anymore */
831inline_speed void
832fd_kill (EV_P_ int fd)
833{
834 ev_io *w;
835
836 while ((w = (ev_io *)anfds [fd].head))
837 {
838 ev_io_stop (EV_A_ w);
839 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
840 }
841}
842
843/* check whether the given fd is atcually valid, for error recovery */
844inline_size int
845fd_valid (int fd)
846{
847#ifdef _WIN32
848 return _get_osfhandle (fd) != -1;
849#else
850 return fcntl (fd, F_GETFD) != -1;
851#endif
852}
853
854/* called on EBADF to verify fds */
855static void noinline
856fd_ebadf (EV_P)
857{
273 int i; 858 int fd;
274 859
275 for (i = 0; i < pendingcnt; ++i) 860 for (fd = 0; fd < anfdmax; ++fd)
861 if (anfds [fd].events)
862 if (!fd_valid (fd) && errno == EBADF)
863 fd_kill (EV_A_ fd);
864}
865
866/* called on ENOMEM in select/poll to kill some fds and retry */
867static void noinline
868fd_enomem (EV_P)
869{
870 int fd;
871
872 for (fd = anfdmax; fd--; )
873 if (anfds [fd].events)
276 { 874 {
277 ANPENDING *p = pendings + i; 875 fd_kill (EV_A_ fd);
876 return;
877 }
878}
278 879
279 if (p->w) 880/* usually called after fork if backend needs to re-arm all fds from scratch */
881static void noinline
882fd_rearm_all (EV_P)
883{
884 int fd;
885
886 for (fd = 0; fd < anfdmax; ++fd)
887 if (anfds [fd].events)
888 {
889 anfds [fd].events = 0;
890 anfds [fd].emask = 0;
891 fd_change (EV_A_ fd, EV__IOFDSET | 1);
892 }
893}
894
895/*****************************************************************************/
896
897/*
898 * the heap functions want a real array index. array index 0 uis guaranteed to not
899 * be in-use at any time. the first heap entry is at array [HEAP0]. DHEAP gives
900 * the branching factor of the d-tree.
901 */
902
903/*
904 * at the moment we allow libev the luxury of two heaps,
905 * a small-code-size 2-heap one and a ~1.5kb larger 4-heap
906 * which is more cache-efficient.
907 * the difference is about 5% with 50000+ watchers.
908 */
909#if EV_USE_4HEAP
910
911#define DHEAP 4
912#define HEAP0 (DHEAP - 1) /* index of first element in heap */
913#define HPARENT(k) ((((k) - HEAP0 - 1) / DHEAP) + HEAP0)
914#define UPHEAP_DONE(p,k) ((p) == (k))
915
916/* away from the root */
917inline_speed void
918downheap (ANHE *heap, int N, int k)
919{
920 ANHE he = heap [k];
921 ANHE *E = heap + N + HEAP0;
922
923 for (;;)
924 {
925 ev_tstamp minat;
926 ANHE *minpos;
927 ANHE *pos = heap + DHEAP * (k - HEAP0) + HEAP0 + 1;
928
929 /* find minimum child */
930 if (expect_true (pos + DHEAP - 1 < E))
280 { 931 {
281 p->w->pending = 0; 932 /* fast path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
282 p->w->cb (p->w, p->events); 933 if ( ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
934 if ( ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
935 if ( ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
283 } 936 }
284 } 937 else if (pos < E)
285
286 pendingcnt = 0;
287}
288
289static void
290timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)
291{
292 while (timercnt && timers [0]->at <= now)
293 {
294 struct ev_timer *w = timers [0];
295
296 /* first reschedule or stop timer */
297 if (w->repeat)
298 { 938 {
299 if (w->is_abs) 939 /* slow path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
300 w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat; 940 if (pos + 1 < E && ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
301 else 941 if (pos + 2 < E && ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
302 w->at = now + w->repeat; 942 if (pos + 3 < E && ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
303
304 assert (w->at > now);
305
306 downheap (timers, timercnt, 0);
307 } 943 }
308 else 944 else
945 break;
946
947 if (ANHE_at (he) <= minat)
948 break;
949
950 heap [k] = *minpos;
951 ev_active (ANHE_w (*minpos)) = k;
952
953 k = minpos - heap;
954 }
955
956 heap [k] = he;
957 ev_active (ANHE_w (he)) = k;
958}
959
960#else /* 4HEAP */
961
962#define HEAP0 1
963#define HPARENT(k) ((k) >> 1)
964#define UPHEAP_DONE(p,k) (!(p))
965
966/* away from the root */
967inline_speed void
968downheap (ANHE *heap, int N, int k)
969{
970 ANHE he = heap [k];
971
972 for (;;)
973 {
974 int c = k << 1;
975
976 if (c > N + HEAP0 - 1)
977 break;
978
979 c += c + 1 < N + HEAP0 && ANHE_at (heap [c]) > ANHE_at (heap [c + 1])
980 ? 1 : 0;
981
982 if (ANHE_at (he) <= ANHE_at (heap [c]))
983 break;
984
985 heap [k] = heap [c];
986 ev_active (ANHE_w (heap [k])) = k;
987
988 k = c;
989 }
990
991 heap [k] = he;
992 ev_active (ANHE_w (he)) = k;
993}
994#endif
995
996/* towards the root */
997inline_speed void
998upheap (ANHE *heap, int k)
999{
1000 ANHE he = heap [k];
1001
1002 for (;;)
1003 {
1004 int p = HPARENT (k);
1005
1006 if (UPHEAP_DONE (p, k) || ANHE_at (heap [p]) <= ANHE_at (he))
1007 break;
1008
1009 heap [k] = heap [p];
1010 ev_active (ANHE_w (heap [k])) = k;
1011 k = p;
1012 }
1013
1014 heap [k] = he;
1015 ev_active (ANHE_w (he)) = k;
1016}
1017
1018/* move an element suitably so it is in a correct place */
1019inline_size void
1020adjustheap (ANHE *heap, int N, int k)
1021{
1022 if (k > HEAP0 && ANHE_at (heap [HPARENT (k)]) >= ANHE_at (heap [k]))
1023 upheap (heap, k);
1024 else
1025 downheap (heap, N, k);
1026}
1027
1028/* rebuild the heap: this function is used only once and executed rarely */
1029inline_size void
1030reheap (ANHE *heap, int N)
1031{
1032 int i;
1033
1034 /* we don't use floyds algorithm, upheap is simpler and is more cache-efficient */
1035 /* also, this is easy to implement and correct for both 2-heaps and 4-heaps */
1036 for (i = 0; i < N; ++i)
1037 upheap (heap, i + HEAP0);
1038}
1039
1040/*****************************************************************************/
1041
1042/* associate signal watchers to a signal signal */
1043typedef struct
1044{
1045 WL head;
1046 EV_ATOMIC_T gotsig;
1047} ANSIG;
1048
1049static ANSIG *signals;
1050static int signalmax;
1051
1052static EV_ATOMIC_T gotsig;
1053
1054/*****************************************************************************/
1055
1056/* used to prepare libev internal fd's */
1057/* this is not fork-safe */
1058inline_speed void
1059fd_intern (int fd)
1060{
1061#ifdef _WIN32
1062 unsigned long arg = 1;
1063 ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
1064#else
1065 fcntl (fd, F_SETFD, FD_CLOEXEC);
1066 fcntl (fd, F_SETFL, O_NONBLOCK);
1067#endif
1068}
1069
1070static void noinline
1071evpipe_init (EV_P)
1072{
1073 if (!ev_is_active (&pipe_w))
1074 {
1075#if EV_USE_EVENTFD
1076 if ((evfd = eventfd (0, 0)) >= 0)
309 { 1077 {
310 evtimer_stop (w); /* nonrepeating: stop timer */ 1078 evpipe [0] = -1;
311 --timercnt; /* maybe pass by reference instead? */ 1079 fd_intern (evfd);
1080 ev_io_set (&pipe_w, evfd, EV_READ);
312 } 1081 }
1082 else
1083#endif
1084 {
1085 while (pipe (evpipe))
1086 ev_syserr ("(libev) error creating signal/async pipe");
313 1087
314 event ((struct ev_watcher *)w, EV_TIMEOUT); 1088 fd_intern (evpipe [0]);
1089 fd_intern (evpipe [1]);
1090 ev_io_set (&pipe_w, evpipe [0], EV_READ);
1091 }
1092
1093 ev_io_start (EV_A_ &pipe_w);
1094 ev_unref (EV_A); /* watcher should not keep loop alive */
1095 }
1096}
1097
1098inline_size void
1099evpipe_write (EV_P_ EV_ATOMIC_T *flag)
1100{
1101 if (!*flag)
315 } 1102 {
316} 1103 int old_errno = errno; /* save errno because write might clobber it */
317 1104
1105 *flag = 1;
1106
1107#if EV_USE_EVENTFD
1108 if (evfd >= 0)
1109 {
1110 uint64_t counter = 1;
1111 write (evfd, &counter, sizeof (uint64_t));
1112 }
1113 else
1114#endif
1115 write (evpipe [1], &old_errno, 1);
1116
1117 errno = old_errno;
1118 }
1119}
1120
1121/* called whenever the libev signal pipe */
1122/* got some events (signal, async) */
318static void 1123static void
319time_update () 1124pipecb (EV_P_ ev_io *iow, int revents)
1125{
1126#if EV_USE_EVENTFD
1127 if (evfd >= 0)
1128 {
1129 uint64_t counter;
1130 read (evfd, &counter, sizeof (uint64_t));
1131 }
1132 else
1133#endif
1134 {
1135 char dummy;
1136 read (evpipe [0], &dummy, 1);
1137 }
1138
1139 if (gotsig && ev_is_default_loop (EV_A))
1140 {
1141 int signum;
1142 gotsig = 0;
1143
1144 for (signum = signalmax; signum--; )
1145 if (signals [signum].gotsig)
1146 ev_feed_signal_event (EV_A_ signum + 1);
1147 }
1148
1149#if EV_ASYNC_ENABLE
1150 if (gotasync)
1151 {
1152 int i;
1153 gotasync = 0;
1154
1155 for (i = asynccnt; i--; )
1156 if (asyncs [i]->sent)
1157 {
1158 asyncs [i]->sent = 0;
1159 ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
1160 }
1161 }
1162#endif
1163}
1164
1165/*****************************************************************************/
1166
1167static void
1168ev_sighandler (int signum)
1169{
1170#if EV_MULTIPLICITY
1171 struct ev_loop *loop = &default_loop_struct;
1172#endif
1173
1174#if _WIN32
1175 signal (signum, ev_sighandler);
1176#endif
1177
1178 signals [signum - 1].gotsig = 1;
1179 evpipe_write (EV_A_ &gotsig);
1180}
1181
1182void noinline
1183ev_feed_signal_event (EV_P_ int signum)
1184{
1185 WL w;
1186
1187#if EV_MULTIPLICITY
1188 assert (("libev: feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
1189#endif
1190
1191 --signum;
1192
1193 if (signum < 0 || signum >= signalmax)
1194 return;
1195
1196 signals [signum].gotsig = 0;
1197
1198 for (w = signals [signum].head; w; w = w->next)
1199 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
1200}
1201
1202/*****************************************************************************/
1203
1204static WL childs [EV_PID_HASHSIZE];
1205
1206#ifndef _WIN32
1207
1208static ev_signal childev;
1209
1210#ifndef WIFCONTINUED
1211# define WIFCONTINUED(status) 0
1212#endif
1213
1214/* handle a single child status event */
1215inline_speed void
1216child_reap (EV_P_ int chain, int pid, int status)
1217{
1218 ev_child *w;
1219 int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
1220
1221 for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
1222 {
1223 if ((w->pid == pid || !w->pid)
1224 && (!traced || (w->flags & 1)))
1225 {
1226 ev_set_priority (w, EV_MAXPRI); /* need to do it *now*, this *must* be the same prio as the signal watcher itself */
1227 w->rpid = pid;
1228 w->rstatus = status;
1229 ev_feed_event (EV_A_ (W)w, EV_CHILD);
1230 }
1231 }
1232}
1233
1234#ifndef WCONTINUED
1235# define WCONTINUED 0
1236#endif
1237
1238/* called on sigchld etc., calls waitpid */
1239static void
1240childcb (EV_P_ ev_signal *sw, int revents)
1241{
1242 int pid, status;
1243
1244 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
1245 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
1246 if (!WCONTINUED
1247 || errno != EINVAL
1248 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
1249 return;
1250
1251 /* make sure we are called again until all children have been reaped */
1252 /* we need to do it this way so that the callback gets called before we continue */
1253 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
1254
1255 child_reap (EV_A_ pid, pid, status);
1256 if (EV_PID_HASHSIZE > 1)
1257 child_reap (EV_A_ 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
1258}
1259
1260#endif
1261
1262/*****************************************************************************/
1263
1264#if EV_USE_PORT
1265# include "ev_port.c"
1266#endif
1267#if EV_USE_KQUEUE
1268# include "ev_kqueue.c"
1269#endif
1270#if EV_USE_EPOLL
1271# include "ev_epoll.c"
1272#endif
1273#if EV_USE_POLL
1274# include "ev_poll.c"
1275#endif
1276#if EV_USE_SELECT
1277# include "ev_select.c"
1278#endif
1279
1280int
1281ev_version_major (void)
1282{
1283 return EV_VERSION_MAJOR;
1284}
1285
1286int
1287ev_version_minor (void)
1288{
1289 return EV_VERSION_MINOR;
1290}
1291
1292/* return true if we are running with elevated privileges and should ignore env variables */
1293int inline_size
1294enable_secure (void)
1295{
1296#ifdef _WIN32
1297 return 0;
1298#else
1299 return getuid () != geteuid ()
1300 || getgid () != getegid ();
1301#endif
1302}
1303
1304unsigned int
1305ev_supported_backends (void)
1306{
1307 unsigned int flags = 0;
1308
1309 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
1310 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
1311 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
1312 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
1313 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
1314
1315 return flags;
1316}
1317
1318unsigned int
1319ev_recommended_backends (void)
1320{
1321 unsigned int flags = ev_supported_backends ();
1322
1323#ifndef __NetBSD__
1324 /* kqueue is borked on everything but netbsd apparently */
1325 /* it usually doesn't work correctly on anything but sockets and pipes */
1326 flags &= ~EVBACKEND_KQUEUE;
1327#endif
1328#ifdef __APPLE__
1329 /* only select works correctly on that "unix-certified" platform */
1330 flags &= ~EVBACKEND_KQUEUE; /* horribly broken, even for sockets */
1331 flags &= ~EVBACKEND_POLL; /* poll is based on kqueue from 10.5 onwards */
1332#endif
1333
1334 return flags;
1335}
1336
1337unsigned int
1338ev_embeddable_backends (void)
1339{
1340 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
1341
1342 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
1343 /* please fix it and tell me how to detect the fix */
1344 flags &= ~EVBACKEND_EPOLL;
1345
1346 return flags;
1347}
1348
1349unsigned int
1350ev_backend (EV_P)
1351{
1352 return backend;
1353}
1354
1355unsigned int
1356ev_loop_count (EV_P)
1357{
1358 return loop_count;
1359}
1360
1361void
1362ev_set_io_collect_interval (EV_P_ ev_tstamp interval)
1363{
1364 io_blocktime = interval;
1365}
1366
1367void
1368ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval)
1369{
1370 timeout_blocktime = interval;
1371}
1372
1373/* initialise a loop structure, must be zero-initialised */
1374static void noinline
1375loop_init (EV_P_ unsigned int flags)
1376{
1377 if (!backend)
1378 {
1379#if EV_USE_REALTIME
1380 if (!have_realtime)
1381 {
1382 struct timespec ts;
1383
1384 if (!clock_gettime (CLOCK_REALTIME, &ts))
1385 have_realtime = 1;
1386 }
1387#endif
1388
1389#if EV_USE_MONOTONIC
1390 if (!have_monotonic)
1391 {
1392 struct timespec ts;
1393
1394 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
1395 have_monotonic = 1;
1396 }
1397#endif
1398
1399 ev_rt_now = ev_time ();
1400 mn_now = get_clock ();
1401 now_floor = mn_now;
1402 rtmn_diff = ev_rt_now - mn_now;
1403
1404 io_blocktime = 0.;
1405 timeout_blocktime = 0.;
1406 backend = 0;
1407 backend_fd = -1;
1408 gotasync = 0;
1409#if EV_USE_INOTIFY
1410 fs_fd = -2;
1411#endif
1412
1413 /* pid check not overridable via env */
1414#ifndef _WIN32
1415 if (flags & EVFLAG_FORKCHECK)
1416 curpid = getpid ();
1417#endif
1418
1419 if (!(flags & EVFLAG_NOENV)
1420 && !enable_secure ()
1421 && getenv ("LIBEV_FLAGS"))
1422 flags = atoi (getenv ("LIBEV_FLAGS"));
1423
1424 if (!(flags & 0x0000ffffU))
1425 flags |= ev_recommended_backends ();
1426
1427#if EV_USE_PORT
1428 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
1429#endif
1430#if EV_USE_KQUEUE
1431 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
1432#endif
1433#if EV_USE_EPOLL
1434 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
1435#endif
1436#if EV_USE_POLL
1437 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
1438#endif
1439#if EV_USE_SELECT
1440 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
1441#endif
1442
1443 ev_prepare_init (&pending_w, pendingcb);
1444
1445 ev_init (&pipe_w, pipecb);
1446 ev_set_priority (&pipe_w, EV_MAXPRI);
1447 }
1448}
1449
1450/* free up a loop structure */
1451static void noinline
1452loop_destroy (EV_P)
320{ 1453{
321 int i; 1454 int i;
322 ev_now = ev_time ();
323 1455
324 if (have_monotonic) 1456 if (ev_is_active (&pipe_w))
325 { 1457 {
326 ev_tstamp odiff = diff; 1458 ev_ref (EV_A); /* signal watcher */
1459 ev_io_stop (EV_A_ &pipe_w);
327 1460
328 /* detecting time jumps is much more difficult */ 1461#if EV_USE_EVENTFD
329 for (i = 2; --i; ) /* loop a few times, before making important decisions */ 1462 if (evfd >= 0)
1463 close (evfd);
1464#endif
1465
1466 if (evpipe [0] >= 0)
330 { 1467 {
1468 close (evpipe [0]);
1469 close (evpipe [1]);
1470 }
1471 }
1472
1473#if EV_USE_INOTIFY
1474 if (fs_fd >= 0)
1475 close (fs_fd);
1476#endif
1477
1478 if (backend_fd >= 0)
1479 close (backend_fd);
1480
1481#if EV_USE_PORT
1482 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
1483#endif
1484#if EV_USE_KQUEUE
1485 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
1486#endif
1487#if EV_USE_EPOLL
1488 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
1489#endif
1490#if EV_USE_POLL
1491 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
1492#endif
1493#if EV_USE_SELECT
1494 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
1495#endif
1496
1497 for (i = NUMPRI; i--; )
1498 {
1499 array_free (pending, [i]);
1500#if EV_IDLE_ENABLE
1501 array_free (idle, [i]);
1502#endif
1503 }
1504
1505 ev_free (anfds); anfdmax = 0;
1506
1507 /* have to use the microsoft-never-gets-it-right macro */
1508 array_free (rfeed, EMPTY);
1509 array_free (fdchange, EMPTY);
1510 array_free (timer, EMPTY);
1511#if EV_PERIODIC_ENABLE
1512 array_free (periodic, EMPTY);
1513#endif
1514#if EV_FORK_ENABLE
1515 array_free (fork, EMPTY);
1516#endif
1517 array_free (prepare, EMPTY);
1518 array_free (check, EMPTY);
1519#if EV_ASYNC_ENABLE
1520 array_free (async, EMPTY);
1521#endif
1522
1523 backend = 0;
1524}
1525
1526#if EV_USE_INOTIFY
1527inline_size void infy_fork (EV_P);
1528#endif
1529
1530inline_size void
1531loop_fork (EV_P)
1532{
1533#if EV_USE_PORT
1534 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
1535#endif
1536#if EV_USE_KQUEUE
1537 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
1538#endif
1539#if EV_USE_EPOLL
1540 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
1541#endif
1542#if EV_USE_INOTIFY
1543 infy_fork (EV_A);
1544#endif
1545
1546 if (ev_is_active (&pipe_w))
1547 {
1548 /* this "locks" the handlers against writing to the pipe */
1549 /* while we modify the fd vars */
1550 gotsig = 1;
1551#if EV_ASYNC_ENABLE
1552 gotasync = 1;
1553#endif
1554
1555 ev_ref (EV_A);
1556 ev_io_stop (EV_A_ &pipe_w);
1557
1558#if EV_USE_EVENTFD
1559 if (evfd >= 0)
1560 close (evfd);
1561#endif
1562
1563 if (evpipe [0] >= 0)
1564 {
1565 close (evpipe [0]);
1566 close (evpipe [1]);
1567 }
1568
1569 evpipe_init (EV_A);
1570 /* now iterate over everything, in case we missed something */
1571 pipecb (EV_A_ &pipe_w, EV_READ);
1572 }
1573
1574 postfork = 0;
1575}
1576
1577#if EV_MULTIPLICITY
1578
1579struct ev_loop *
1580ev_loop_new (unsigned int flags)
1581{
1582 struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
1583
1584 memset (loop, 0, sizeof (struct ev_loop));
1585
1586 loop_init (EV_A_ flags);
1587
1588 if (ev_backend (EV_A))
1589 return loop;
1590
1591 return 0;
1592}
1593
1594void
1595ev_loop_destroy (EV_P)
1596{
1597 loop_destroy (EV_A);
1598 ev_free (loop);
1599}
1600
1601void
1602ev_loop_fork (EV_P)
1603{
1604 postfork = 1; /* must be in line with ev_default_fork */
1605}
1606
1607#if EV_VERIFY
1608static void noinline
1609verify_watcher (EV_P_ W w)
1610{
1611 assert (("libev: watcher has invalid priority", ABSPRI (w) >= 0 && ABSPRI (w) < NUMPRI));
1612
1613 if (w->pending)
1614 assert (("libev: pending watcher not on pending queue", pendings [ABSPRI (w)][w->pending - 1].w == w));
1615}
1616
1617static void noinline
1618verify_heap (EV_P_ ANHE *heap, int N)
1619{
1620 int i;
1621
1622 for (i = HEAP0; i < N + HEAP0; ++i)
1623 {
1624 assert (("libev: active index mismatch in heap", ev_active (ANHE_w (heap [i])) == i));
1625 assert (("libev: heap condition violated", i == HEAP0 || ANHE_at (heap [HPARENT (i)]) <= ANHE_at (heap [i])));
1626 assert (("libev: heap at cache mismatch", ANHE_at (heap [i]) == ev_at (ANHE_w (heap [i]))));
1627
1628 verify_watcher (EV_A_ (W)ANHE_w (heap [i]));
1629 }
1630}
1631
1632static void noinline
1633array_verify (EV_P_ W *ws, int cnt)
1634{
1635 while (cnt--)
1636 {
1637 assert (("libev: active index mismatch", ev_active (ws [cnt]) == cnt + 1));
1638 verify_watcher (EV_A_ ws [cnt]);
1639 }
1640}
1641#endif
1642
1643void
1644ev_loop_verify (EV_P)
1645{
1646#if EV_VERIFY
1647 int i;
1648 WL w;
1649
1650 assert (activecnt >= -1);
1651
1652 assert (fdchangemax >= fdchangecnt);
1653 for (i = 0; i < fdchangecnt; ++i)
1654 assert (("libev: negative fd in fdchanges", fdchanges [i] >= 0));
1655
1656 assert (anfdmax >= 0);
1657 for (i = 0; i < anfdmax; ++i)
1658 for (w = anfds [i].head; w; w = w->next)
1659 {
1660 verify_watcher (EV_A_ (W)w);
1661 assert (("libev: inactive fd watcher on anfd list", ev_active (w) == 1));
1662 assert (("libev: fd mismatch between watcher and anfd", ((ev_io *)w)->fd == i));
1663 }
1664
1665 assert (timermax >= timercnt);
1666 verify_heap (EV_A_ timers, timercnt);
1667
1668#if EV_PERIODIC_ENABLE
1669 assert (periodicmax >= periodiccnt);
1670 verify_heap (EV_A_ periodics, periodiccnt);
1671#endif
1672
1673 for (i = NUMPRI; i--; )
1674 {
1675 assert (pendingmax [i] >= pendingcnt [i]);
1676#if EV_IDLE_ENABLE
1677 assert (idleall >= 0);
1678 assert (idlemax [i] >= idlecnt [i]);
1679 array_verify (EV_A_ (W *)idles [i], idlecnt [i]);
1680#endif
1681 }
1682
1683#if EV_FORK_ENABLE
1684 assert (forkmax >= forkcnt);
1685 array_verify (EV_A_ (W *)forks, forkcnt);
1686#endif
1687
1688#if EV_ASYNC_ENABLE
1689 assert (asyncmax >= asynccnt);
1690 array_verify (EV_A_ (W *)asyncs, asynccnt);
1691#endif
1692
1693 assert (preparemax >= preparecnt);
1694 array_verify (EV_A_ (W *)prepares, preparecnt);
1695
1696 assert (checkmax >= checkcnt);
1697 array_verify (EV_A_ (W *)checks, checkcnt);
1698
1699# if 0
1700 for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
1701 for (signum = signalmax; signum--; ) if (signals [signum].gotsig)
1702# endif
1703#endif
1704}
1705
1706#endif /* multiplicity */
1707
1708#if EV_MULTIPLICITY
1709struct ev_loop *
1710ev_default_loop_init (unsigned int flags)
1711#else
1712int
1713ev_default_loop (unsigned int flags)
1714#endif
1715{
1716 if (!ev_default_loop_ptr)
1717 {
1718#if EV_MULTIPLICITY
1719 struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
1720#else
1721 ev_default_loop_ptr = 1;
1722#endif
1723
1724 loop_init (EV_A_ flags);
1725
1726 if (ev_backend (EV_A))
1727 {
1728#ifndef _WIN32
1729 ev_signal_init (&childev, childcb, SIGCHLD);
1730 ev_set_priority (&childev, EV_MAXPRI);
1731 ev_signal_start (EV_A_ &childev);
1732 ev_unref (EV_A); /* child watcher should not keep loop alive */
1733#endif
1734 }
1735 else
1736 ev_default_loop_ptr = 0;
1737 }
1738
1739 return ev_default_loop_ptr;
1740}
1741
1742void
1743ev_default_destroy (void)
1744{
1745#if EV_MULTIPLICITY
1746 struct ev_loop *loop = ev_default_loop_ptr;
1747#endif
1748
1749 ev_default_loop_ptr = 0;
1750
1751#ifndef _WIN32
1752 ev_ref (EV_A); /* child watcher */
1753 ev_signal_stop (EV_A_ &childev);
1754#endif
1755
1756 loop_destroy (EV_A);
1757}
1758
1759void
1760ev_default_fork (void)
1761{
1762#if EV_MULTIPLICITY
1763 struct ev_loop *loop = ev_default_loop_ptr;
1764#endif
1765
1766 postfork = 1; /* must be in line with ev_loop_fork */
1767}
1768
1769/*****************************************************************************/
1770
1771void
1772ev_invoke (EV_P_ void *w, int revents)
1773{
1774 EV_CB_INVOKE ((W)w, revents);
1775}
1776
1777inline_speed void
1778call_pending (EV_P)
1779{
1780 int pri;
1781
1782 for (pri = NUMPRI; pri--; )
1783 while (pendingcnt [pri])
1784 {
1785 ANPENDING *p = pendings [pri] + --pendingcnt [pri];
1786
1787 /*assert (("libev: non-pending watcher on pending list", p->w->pending));*/
1788 /* ^ this is no longer true, as pending_w could be here */
1789
1790 p->w->pending = 0;
1791 EV_CB_INVOKE (p->w, p->events);
1792 EV_FREQUENT_CHECK;
1793 }
1794}
1795
1796#if EV_IDLE_ENABLE
1797/* make idle watchers pending. this handles the "call-idle */
1798/* only when higher priorities are idle" logic */
1799inline_size void
1800idle_reify (EV_P)
1801{
1802 if (expect_false (idleall))
1803 {
1804 int pri;
1805
1806 for (pri = NUMPRI; pri--; )
1807 {
1808 if (pendingcnt [pri])
1809 break;
1810
1811 if (idlecnt [pri])
1812 {
1813 queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
1814 break;
1815 }
1816 }
1817 }
1818}
1819#endif
1820
1821/* make timers pending */
1822inline_size void
1823timers_reify (EV_P)
1824{
1825 EV_FREQUENT_CHECK;
1826
1827 if (timercnt && ANHE_at (timers [HEAP0]) < mn_now)
1828 {
1829 do
1830 {
1831 ev_timer *w = (ev_timer *)ANHE_w (timers [HEAP0]);
1832
1833 /*assert (("libev: inactive timer on timer heap detected", ev_is_active (w)));*/
1834
1835 /* first reschedule or stop timer */
1836 if (w->repeat)
1837 {
1838 ev_at (w) += w->repeat;
1839 if (ev_at (w) < mn_now)
1840 ev_at (w) = mn_now;
1841
1842 assert (("libev: negative ev_timer repeat value found while processing timers", w->repeat > 0.));
1843
1844 ANHE_at_cache (timers [HEAP0]);
1845 downheap (timers, timercnt, HEAP0);
1846 }
1847 else
1848 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
1849
1850 EV_FREQUENT_CHECK;
1851 feed_reverse (EV_A_ (W)w);
1852 }
1853 while (timercnt && ANHE_at (timers [HEAP0]) < mn_now);
1854
1855 feed_reverse_done (EV_A_ EV_TIMEOUT);
1856 }
1857}
1858
1859#if EV_PERIODIC_ENABLE
1860/* make periodics pending */
1861inline_size void
1862periodics_reify (EV_P)
1863{
1864 EV_FREQUENT_CHECK;
1865
1866 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now)
1867 {
1868 int feed_count = 0;
1869
1870 do
1871 {
1872 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [HEAP0]);
1873
1874 /*assert (("libev: inactive timer on periodic heap detected", ev_is_active (w)));*/
1875
1876 /* first reschedule or stop timer */
1877 if (w->reschedule_cb)
1878 {
1879 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
1880
1881 assert (("libev: ev_periodic reschedule callback returned time in the past", ev_at (w) >= ev_rt_now));
1882
1883 ANHE_at_cache (periodics [HEAP0]);
1884 downheap (periodics, periodiccnt, HEAP0);
1885 }
1886 else if (w->interval)
1887 {
1888 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
1889 /* if next trigger time is not sufficiently in the future, put it there */
1890 /* this might happen because of floating point inexactness */
1891 if (ev_at (w) - ev_rt_now < TIME_EPSILON)
1892 {
1893 ev_at (w) += w->interval;
1894
1895 /* if interval is unreasonably low we might still have a time in the past */
1896 /* so correct this. this will make the periodic very inexact, but the user */
1897 /* has effectively asked to get triggered more often than possible */
1898 if (ev_at (w) < ev_rt_now)
1899 ev_at (w) = ev_rt_now;
1900 }
1901
1902 ANHE_at_cache (periodics [HEAP0]);
1903 downheap (periodics, periodiccnt, HEAP0);
1904 }
1905 else
1906 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
1907
1908 EV_FREQUENT_CHECK;
1909 feed_reverse (EV_A_ (W)w);
1910 }
1911 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now);
1912
1913 feed_reverse_done (EV_A_ EV_PERIODIC);
1914 }
1915}
1916
1917/* simply recalculate all periodics */
1918/* TODO: maybe ensure that at leats one event happens when jumping forward? */
1919static void noinline
1920periodics_reschedule (EV_P)
1921{
1922 int i;
1923
1924 /* adjust periodics after time jump */
1925 for (i = HEAP0; i < periodiccnt + HEAP0; ++i)
1926 {
1927 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [i]);
1928
1929 if (w->reschedule_cb)
1930 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
1931 else if (w->interval)
1932 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
1933
1934 ANHE_at_cache (periodics [i]);
1935 }
1936
1937 reheap (periodics, periodiccnt);
1938}
1939#endif
1940
1941/* adjust all timers by a given offset */
1942static void noinline
1943timers_reschedule (EV_P_ ev_tstamp adjust)
1944{
1945 int i;
1946
1947 for (i = 0; i < timercnt; ++i)
1948 {
1949 ANHE *he = timers + i + HEAP0;
1950 ANHE_w (*he)->at += adjust;
1951 ANHE_at_cache (*he);
1952 }
1953}
1954
1955/* fetch new monotonic and realtime times from the kernel */
1956/* also detetc if there was a timejump, and act accordingly */
1957inline_speed void
1958time_update (EV_P_ ev_tstamp max_block)
1959{
1960#if EV_USE_MONOTONIC
1961 if (expect_true (have_monotonic))
1962 {
1963 int i;
1964 ev_tstamp odiff = rtmn_diff;
1965
331 now = get_clock (); 1966 mn_now = get_clock ();
1967
1968 /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
1969 /* interpolate in the meantime */
1970 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
1971 {
1972 ev_rt_now = rtmn_diff + mn_now;
1973 return;
1974 }
1975
1976 now_floor = mn_now;
1977 ev_rt_now = ev_time ();
1978
1979 /* loop a few times, before making important decisions.
1980 * on the choice of "4": one iteration isn't enough,
1981 * in case we get preempted during the calls to
1982 * ev_time and get_clock. a second call is almost guaranteed
1983 * to succeed in that case, though. and looping a few more times
1984 * doesn't hurt either as we only do this on time-jumps or
1985 * in the unlikely event of having been preempted here.
1986 */
1987 for (i = 4; --i; )
1988 {
332 diff = ev_now - now; 1989 rtmn_diff = ev_rt_now - mn_now;
333 1990
334 if (fabs (odiff - diff) < MIN_TIMEJUMP) 1991 if (expect_true (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP))
335 return; /* all is well */ 1992 return; /* all is well */
336 1993
337 ev_now = ev_time (); 1994 ev_rt_now = ev_time ();
1995 mn_now = get_clock ();
1996 now_floor = mn_now;
338 } 1997 }
339 1998
340 /* time jump detected, reschedule atimers */ 1999 /* no timer adjustment, as the monotonic clock doesn't jump */
341 for (i = 0; i < atimercnt; ++i) 2000 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
2001# if EV_PERIODIC_ENABLE
2002 periodics_reschedule (EV_A);
2003# endif
2004 }
2005 else
2006#endif
2007 {
2008 ev_rt_now = ev_time ();
2009
2010 if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
342 { 2011 {
343 struct ev_timer *w = atimers [i]; 2012 /* adjust timers. this is easy, as the offset is the same for all of them */
344 w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat; 2013 timers_reschedule (EV_A_ ev_rt_now - mn_now);
2014#if EV_PERIODIC_ENABLE
2015 periodics_reschedule (EV_A);
2016#endif
345 } 2017 }
346 }
347 else
348 {
349 if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
350 /* time jump detected, adjust rtimers */
351 for (i = 0; i < rtimercnt; ++i)
352 rtimers [i]->at += ev_now - now;
353 2018
354 now = ev_now; 2019 mn_now = ev_rt_now;
355 } 2020 }
356} 2021}
357 2022
358int ev_loop_done; 2023static int loop_done;
359 2024
2025void
360void ev_loop (int flags) 2026ev_loop (EV_P_ int flags)
361{ 2027{
362 double block; 2028 loop_done = EVUNLOOP_CANCEL;
363 ev_loop_done = flags & EVLOOP_ONESHOT; 2029
2030 call_pending (EV_A); /* in case we recurse, ensure ordering stays nice and clean */
364 2031
365 do 2032 do
366 { 2033 {
2034#if EV_VERIFY >= 2
2035 ev_loop_verify (EV_A);
2036#endif
2037
2038#ifndef _WIN32
2039 if (expect_false (curpid)) /* penalise the forking check even more */
2040 if (expect_false (getpid () != curpid))
2041 {
2042 curpid = getpid ();
2043 postfork = 1;
2044 }
2045#endif
2046
2047#if EV_FORK_ENABLE
2048 /* we might have forked, so queue fork handlers */
2049 if (expect_false (postfork))
2050 if (forkcnt)
2051 {
2052 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
2053 call_pending (EV_A);
2054 }
2055#endif
2056
2057 /* queue prepare watchers (and execute them) */
2058 if (expect_false (preparecnt))
2059 {
2060 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
2061 call_pending (EV_A);
2062 }
2063
2064 /* we might have forked, so reify kernel state if necessary */
2065 if (expect_false (postfork))
2066 loop_fork (EV_A);
2067
367 /* update fd-related kernel structures */ 2068 /* update fd-related kernel structures */
368 fd_reify (); 2069 fd_reify (EV_A);
369 2070
370 /* calculate blocking time */ 2071 /* calculate blocking time */
371 if (flags & EVLOOP_NONBLOCK) 2072 {
372 block = 0.; 2073 ev_tstamp waittime = 0.;
373 else 2074 ev_tstamp sleeptime = 0.;
2075
2076 if (expect_true (!(flags & EVLOOP_NONBLOCK || idleall || !activecnt)))
374 { 2077 {
2078 /* update time to cancel out callback processing overhead */
2079 time_update (EV_A_ 1e100);
2080
375 block = MAX_BLOCKTIME; 2081 waittime = MAX_BLOCKTIME;
376 2082
377 if (rtimercnt) 2083 if (timercnt)
378 { 2084 {
379 ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge; 2085 ev_tstamp to = ANHE_at (timers [HEAP0]) - mn_now + backend_fudge;
380 if (block > to) block = to; 2086 if (waittime > to) waittime = to;
381 } 2087 }
382 2088
2089#if EV_PERIODIC_ENABLE
383 if (atimercnt) 2090 if (periodiccnt)
384 { 2091 {
385 ev_tstamp to = atimers [0]->at - ev_time () + method_fudge; 2092 ev_tstamp to = ANHE_at (periodics [HEAP0]) - ev_rt_now + backend_fudge;
386 if (block > to) block = to; 2093 if (waittime > to) waittime = to;
387 } 2094 }
2095#endif
388 2096
389 if (block < 0.) block = 0.; 2097 if (expect_false (waittime < timeout_blocktime))
2098 waittime = timeout_blocktime;
2099
2100 sleeptime = waittime - backend_fudge;
2101
2102 if (expect_true (sleeptime > io_blocktime))
2103 sleeptime = io_blocktime;
2104
2105 if (sleeptime)
2106 {
2107 ev_sleep (sleeptime);
2108 waittime -= sleeptime;
2109 }
390 } 2110 }
391 2111
392 method_poll (block); 2112 ++loop_count;
2113 backend_poll (EV_A_ waittime);
393 2114
394 /* update ev_now, do magic */ 2115 /* update ev_rt_now, do magic */
395 time_update (); 2116 time_update (EV_A_ waittime + sleeptime);
2117 }
396 2118
397 /* put pending timers into pendign queue and reschedule them */ 2119 /* queue pending timers and reschedule them */
398 /* absolute timers first */ 2120 timers_reify (EV_A); /* relative timers called last */
399 timers_reify (atimers, atimercnt, ev_now); 2121#if EV_PERIODIC_ENABLE
400 /* relative timers second */ 2122 periodics_reify (EV_A); /* absolute timers called first */
401 timers_reify (rtimers, rtimercnt, now); 2123#endif
402 2124
2125#if EV_IDLE_ENABLE
2126 /* queue idle watchers unless other events are pending */
2127 idle_reify (EV_A);
2128#endif
2129
2130 /* queue check watchers, to be executed first */
2131 if (expect_false (checkcnt))
2132 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
2133
403 call_pending (); 2134 call_pending (EV_A);
404 } 2135 }
405 while (!ev_loop_done); 2136 while (expect_true (
406} 2137 activecnt
2138 && !loop_done
2139 && !(flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK))
2140 ));
407 2141
408static void 2142 if (loop_done == EVUNLOOP_ONE)
409wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem) 2143 loop_done = EVUNLOOP_CANCEL;
2144}
2145
2146void
2147ev_unloop (EV_P_ int how)
2148{
2149 loop_done = how;
2150}
2151
2152void
2153ev_ref (EV_P)
2154{
2155 ++activecnt;
2156}
2157
2158void
2159ev_unref (EV_P)
2160{
2161 --activecnt;
2162}
2163
2164void
2165ev_now_update (EV_P)
2166{
2167 time_update (EV_A_ 1e100);
2168}
2169
2170void
2171ev_suspend (EV_P)
2172{
2173 ev_now_update (EV_A);
2174}
2175
2176void
2177ev_resume (EV_P)
2178{
2179 ev_tstamp mn_prev = mn_now;
2180
2181 ev_now_update (EV_A);
2182 timers_reschedule (EV_A_ mn_now - mn_prev);
2183#if EV_PERIODIC_ENABLE
2184 /* TODO: really do this? */
2185 periodics_reschedule (EV_A);
2186#endif
2187}
2188
2189/*****************************************************************************/
2190/* singly-linked list management, used when the expected list length is short */
2191
2192inline_size void
2193wlist_add (WL *head, WL elem)
410{ 2194{
411 elem->next = *head; 2195 elem->next = *head;
412 *head = elem; 2196 *head = elem;
413} 2197}
414 2198
415static void 2199inline_size void
416wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem) 2200wlist_del (WL *head, WL elem)
417{ 2201{
418 while (*head) 2202 while (*head)
419 { 2203 {
420 if (*head == elem) 2204 if (*head == elem)
421 { 2205 {
… …
425 2209
426 head = &(*head)->next; 2210 head = &(*head)->next;
427 } 2211 }
428} 2212}
429 2213
2214/* internal, faster, version of ev_clear_pending */
2215inline_speed void
2216clear_pending (EV_P_ W w)
2217{
2218 if (w->pending)
2219 {
2220 pendings [ABSPRI (w)][w->pending - 1].w = (W)&pending_w;
2221 w->pending = 0;
2222 }
2223}
2224
2225int
2226ev_clear_pending (EV_P_ void *w)
2227{
2228 W w_ = (W)w;
2229 int pending = w_->pending;
2230
2231 if (expect_true (pending))
2232 {
2233 ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
2234 p->w = (W)&pending_w;
2235 w_->pending = 0;
2236 return p->events;
2237 }
2238 else
2239 return 0;
2240}
2241
2242inline_size void
2243pri_adjust (EV_P_ W w)
2244{
2245 int pri = w->priority;
2246 pri = pri < EV_MINPRI ? EV_MINPRI : pri;
2247 pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
2248 w->priority = pri;
2249}
2250
2251inline_speed void
2252ev_start (EV_P_ W w, int active)
2253{
2254 pri_adjust (EV_A_ w);
2255 w->active = active;
2256 ev_ref (EV_A);
2257}
2258
2259inline_size void
2260ev_stop (EV_P_ W w)
2261{
2262 ev_unref (EV_A);
2263 w->active = 0;
2264}
2265
2266/*****************************************************************************/
2267
2268void noinline
2269ev_io_start (EV_P_ ev_io *w)
2270{
2271 int fd = w->fd;
2272
2273 if (expect_false (ev_is_active (w)))
2274 return;
2275
2276 assert (("libev: ev_io_start called with negative fd", fd >= 0));
2277 assert (("libev: ev_io start called with illegal event mask", !(w->events & ~(EV__IOFDSET | EV_READ | EV_WRITE))));
2278
2279 EV_FREQUENT_CHECK;
2280
2281 ev_start (EV_A_ (W)w, 1);
2282 array_needsize (ANFD, anfds, anfdmax, fd + 1, array_init_zero);
2283 wlist_add (&anfds[fd].head, (WL)w);
2284
2285 fd_change (EV_A_ fd, w->events & EV__IOFDSET | 1);
2286 w->events &= ~EV__IOFDSET;
2287
2288 EV_FREQUENT_CHECK;
2289}
2290
2291void noinline
2292ev_io_stop (EV_P_ ev_io *w)
2293{
2294 clear_pending (EV_A_ (W)w);
2295 if (expect_false (!ev_is_active (w)))
2296 return;
2297
2298 assert (("libev: ev_io_stop called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
2299
2300 EV_FREQUENT_CHECK;
2301
2302 wlist_del (&anfds[w->fd].head, (WL)w);
2303 ev_stop (EV_A_ (W)w);
2304
2305 fd_change (EV_A_ w->fd, 1);
2306
2307 EV_FREQUENT_CHECK;
2308}
2309
2310void noinline
2311ev_timer_start (EV_P_ ev_timer *w)
2312{
2313 if (expect_false (ev_is_active (w)))
2314 return;
2315
2316 ev_at (w) += mn_now;
2317
2318 assert (("libev: ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
2319
2320 EV_FREQUENT_CHECK;
2321
2322 ++timercnt;
2323 ev_start (EV_A_ (W)w, timercnt + HEAP0 - 1);
2324 array_needsize (ANHE, timers, timermax, ev_active (w) + 1, EMPTY2);
2325 ANHE_w (timers [ev_active (w)]) = (WT)w;
2326 ANHE_at_cache (timers [ev_active (w)]);
2327 upheap (timers, ev_active (w));
2328
2329 EV_FREQUENT_CHECK;
2330
2331 /*assert (("libev: internal timer heap corruption", timers [ev_active (w)] == (WT)w));*/
2332}
2333
2334void noinline
2335ev_timer_stop (EV_P_ ev_timer *w)
2336{
2337 clear_pending (EV_A_ (W)w);
2338 if (expect_false (!ev_is_active (w)))
2339 return;
2340
2341 EV_FREQUENT_CHECK;
2342
2343 {
2344 int active = ev_active (w);
2345
2346 assert (("libev: internal timer heap corruption", ANHE_w (timers [active]) == (WT)w));
2347
2348 --timercnt;
2349
2350 if (expect_true (active < timercnt + HEAP0))
2351 {
2352 timers [active] = timers [timercnt + HEAP0];
2353 adjustheap (timers, timercnt, active);
2354 }
2355 }
2356
2357 EV_FREQUENT_CHECK;
2358
2359 ev_at (w) -= mn_now;
2360
2361 ev_stop (EV_A_ (W)w);
2362}
2363
2364void noinline
2365ev_timer_again (EV_P_ ev_timer *w)
2366{
2367 EV_FREQUENT_CHECK;
2368
2369 if (ev_is_active (w))
2370 {
2371 if (w->repeat)
2372 {
2373 ev_at (w) = mn_now + w->repeat;
2374 ANHE_at_cache (timers [ev_active (w)]);
2375 adjustheap (timers, timercnt, ev_active (w));
2376 }
2377 else
2378 ev_timer_stop (EV_A_ w);
2379 }
2380 else if (w->repeat)
2381 {
2382 ev_at (w) = w->repeat;
2383 ev_timer_start (EV_A_ w);
2384 }
2385
2386 EV_FREQUENT_CHECK;
2387}
2388
2389#if EV_PERIODIC_ENABLE
2390void noinline
2391ev_periodic_start (EV_P_ ev_periodic *w)
2392{
2393 if (expect_false (ev_is_active (w)))
2394 return;
2395
2396 if (w->reschedule_cb)
2397 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2398 else if (w->interval)
2399 {
2400 assert (("libev: ev_periodic_start called with negative interval value", w->interval >= 0.));
2401 /* this formula differs from the one in periodic_reify because we do not always round up */
2402 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
2403 }
2404 else
2405 ev_at (w) = w->offset;
2406
2407 EV_FREQUENT_CHECK;
2408
2409 ++periodiccnt;
2410 ev_start (EV_A_ (W)w, periodiccnt + HEAP0 - 1);
2411 array_needsize (ANHE, periodics, periodicmax, ev_active (w) + 1, EMPTY2);
2412 ANHE_w (periodics [ev_active (w)]) = (WT)w;
2413 ANHE_at_cache (periodics [ev_active (w)]);
2414 upheap (periodics, ev_active (w));
2415
2416 EV_FREQUENT_CHECK;
2417
2418 /*assert (("libev: internal periodic heap corruption", ANHE_w (periodics [ev_active (w)]) == (WT)w));*/
2419}
2420
2421void noinline
2422ev_periodic_stop (EV_P_ ev_periodic *w)
2423{
2424 clear_pending (EV_A_ (W)w);
2425 if (expect_false (!ev_is_active (w)))
2426 return;
2427
2428 EV_FREQUENT_CHECK;
2429
2430 {
2431 int active = ev_active (w);
2432
2433 assert (("libev: internal periodic heap corruption", ANHE_w (periodics [active]) == (WT)w));
2434
2435 --periodiccnt;
2436
2437 if (expect_true (active < periodiccnt + HEAP0))
2438 {
2439 periodics [active] = periodics [periodiccnt + HEAP0];
2440 adjustheap (periodics, periodiccnt, active);
2441 }
2442 }
2443
2444 EV_FREQUENT_CHECK;
2445
2446 ev_stop (EV_A_ (W)w);
2447}
2448
2449void noinline
2450ev_periodic_again (EV_P_ ev_periodic *w)
2451{
2452 /* TODO: use adjustheap and recalculation */
2453 ev_periodic_stop (EV_A_ w);
2454 ev_periodic_start (EV_A_ w);
2455}
2456#endif
2457
2458#ifndef SA_RESTART
2459# define SA_RESTART 0
2460#endif
2461
2462void noinline
2463ev_signal_start (EV_P_ ev_signal *w)
2464{
2465#if EV_MULTIPLICITY
2466 assert (("libev: signal watchers are only supported in the default loop", loop == ev_default_loop_ptr));
2467#endif
2468 if (expect_false (ev_is_active (w)))
2469 return;
2470
2471 assert (("libev: ev_signal_start called with illegal signal number", w->signum > 0));
2472
2473 evpipe_init (EV_A);
2474
2475 EV_FREQUENT_CHECK;
2476
2477 {
2478#ifndef _WIN32
2479 sigset_t full, prev;
2480 sigfillset (&full);
2481 sigprocmask (SIG_SETMASK, &full, &prev);
2482#endif
2483
2484 array_needsize (ANSIG, signals, signalmax, w->signum, array_init_zero);
2485
2486#ifndef _WIN32
2487 sigprocmask (SIG_SETMASK, &prev, 0);
2488#endif
2489 }
2490
2491 ev_start (EV_A_ (W)w, 1);
2492 wlist_add (&signals [w->signum - 1].head, (WL)w);
2493
2494 if (!((WL)w)->next)
2495 {
2496#if _WIN32
2497 signal (w->signum, ev_sighandler);
2498#else
2499 struct sigaction sa;
2500 sa.sa_handler = ev_sighandler;
2501 sigfillset (&sa.sa_mask);
2502 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
2503 sigaction (w->signum, &sa, 0);
2504#endif
2505 }
2506
2507 EV_FREQUENT_CHECK;
2508}
2509
2510void noinline
2511ev_signal_stop (EV_P_ ev_signal *w)
2512{
2513 clear_pending (EV_A_ (W)w);
2514 if (expect_false (!ev_is_active (w)))
2515 return;
2516
2517 EV_FREQUENT_CHECK;
2518
2519 wlist_del (&signals [w->signum - 1].head, (WL)w);
2520 ev_stop (EV_A_ (W)w);
2521
2522 if (!signals [w->signum - 1].head)
2523 signal (w->signum, SIG_DFL);
2524
2525 EV_FREQUENT_CHECK;
2526}
2527
2528void
2529ev_child_start (EV_P_ ev_child *w)
2530{
2531#if EV_MULTIPLICITY
2532 assert (("libev: child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
2533#endif
2534 if (expect_false (ev_is_active (w)))
2535 return;
2536
2537 EV_FREQUENT_CHECK;
2538
2539 ev_start (EV_A_ (W)w, 1);
2540 wlist_add (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
2541
2542 EV_FREQUENT_CHECK;
2543}
2544
2545void
2546ev_child_stop (EV_P_ ev_child *w)
2547{
2548 clear_pending (EV_A_ (W)w);
2549 if (expect_false (!ev_is_active (w)))
2550 return;
2551
2552 EV_FREQUENT_CHECK;
2553
2554 wlist_del (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
2555 ev_stop (EV_A_ (W)w);
2556
2557 EV_FREQUENT_CHECK;
2558}
2559
2560#if EV_STAT_ENABLE
2561
2562# ifdef _WIN32
2563# undef lstat
2564# define lstat(a,b) _stati64 (a,b)
2565# endif
2566
2567#define DEF_STAT_INTERVAL 5.0074891
2568#define NFS_STAT_INTERVAL 30.1074891 /* for filesystems potentially failing inotify */
2569#define MIN_STAT_INTERVAL 0.1074891
2570
2571static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
2572
2573#if EV_USE_INOTIFY
2574# define EV_INOTIFY_BUFSIZE 8192
2575
2576static void noinline
2577infy_add (EV_P_ ev_stat *w)
2578{
2579 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);
2580
2581 if (w->wd < 0)
2582 {
2583 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
2584 ev_timer_again (EV_A_ &w->timer); /* this is not race-free, so we still need to recheck periodically */
2585
2586 /* monitor some parent directory for speedup hints */
2587 /* note that exceeding the hardcoded path limit is not a correctness issue, */
2588 /* but an efficiency issue only */
2589 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
2590 {
2591 char path [4096];
2592 strcpy (path, w->path);
2593
2594 do
2595 {
2596 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
2597 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
2598
2599 char *pend = strrchr (path, '/');
2600
2601 if (!pend || pend == path)
2602 break;
2603
2604 *pend = 0;
2605 w->wd = inotify_add_watch (fs_fd, path, mask);
2606 }
2607 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
2608 }
2609 }
2610
2611 if (w->wd >= 0)
2612 {
2613 wlist_add (&fs_hash [w->wd & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
2614
2615 /* now local changes will be tracked by inotify, but remote changes won't */
2616 /* unless the filesystem it known to be local, we therefore still poll */
2617 /* also do poll on <2.6.25, but with normal frequency */
2618 struct statfs sfs;
2619
2620 if (fs_2625 && !statfs (w->path, &sfs))
2621 if (sfs.f_type == 0x1373 /* devfs */
2622 || sfs.f_type == 0xEF53 /* ext2/3 */
2623 || sfs.f_type == 0x3153464a /* jfs */
2624 || sfs.f_type == 0x52654973 /* reiser3 */
2625 || sfs.f_type == 0x01021994 /* tempfs */
2626 || sfs.f_type == 0x58465342 /* xfs */)
2627 return;
2628
2629 w->timer.repeat = w->interval ? w->interval : fs_2625 ? NFS_STAT_INTERVAL : DEF_STAT_INTERVAL;
2630 ev_timer_again (EV_A_ &w->timer);
2631 }
2632}
2633
2634static void noinline
2635infy_del (EV_P_ ev_stat *w)
2636{
2637 int slot;
2638 int wd = w->wd;
2639
2640 if (wd < 0)
2641 return;
2642
2643 w->wd = -2;
2644 slot = wd & (EV_INOTIFY_HASHSIZE - 1);
2645 wlist_del (&fs_hash [slot].head, (WL)w);
2646
2647 /* remove this watcher, if others are watching it, they will rearm */
2648 inotify_rm_watch (fs_fd, wd);
2649}
2650
2651static void noinline
2652infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
2653{
2654 if (slot < 0)
2655 /* overflow, need to check for all hash slots */
2656 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
2657 infy_wd (EV_A_ slot, wd, ev);
2658 else
2659 {
2660 WL w_;
2661
2662 for (w_ = fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head; w_; )
2663 {
2664 ev_stat *w = (ev_stat *)w_;
2665 w_ = w_->next; /* lets us remove this watcher and all before it */
2666
2667 if (w->wd == wd || wd == -1)
2668 {
2669 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
2670 {
2671 wlist_del (&fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
2672 w->wd = -1;
2673 infy_add (EV_A_ w); /* re-add, no matter what */
2674 }
2675
2676 stat_timer_cb (EV_A_ &w->timer, 0);
2677 }
2678 }
2679 }
2680}
2681
430static void 2682static void
431ev_start (struct ev_watcher *w, int active) 2683infy_cb (EV_P_ ev_io *w, int revents)
432{ 2684{
433 w->pending = 0; 2685 char buf [EV_INOTIFY_BUFSIZE];
434 w->active = active; 2686 struct inotify_event *ev = (struct inotify_event *)buf;
2687 int ofs;
2688 int len = read (fs_fd, buf, sizeof (buf));
2689
2690 for (ofs = 0; ofs < len; ofs += sizeof (struct inotify_event) + ev->len)
2691 infy_wd (EV_A_ ev->wd, ev->wd, ev);
2692}
2693
2694inline_size void
2695check_2625 (EV_P)
2696{
2697 /* kernels < 2.6.25 are borked
2698 * http://www.ussg.indiana.edu/hypermail/linux/kernel/0711.3/1208.html
2699 */
2700 struct utsname buf;
2701 int major, minor, micro;
2702
2703 if (uname (&buf))
2704 return;
2705
2706 if (sscanf (buf.release, "%d.%d.%d", &major, &minor, &micro) != 3)
2707 return;
2708
2709 if (major < 2
2710 || (major == 2 && minor < 6)
2711 || (major == 2 && minor == 6 && micro < 25))
2712 return;
2713
2714 fs_2625 = 1;
2715}
2716
2717inline_size void
2718infy_init (EV_P)
2719{
2720 if (fs_fd != -2)
2721 return;
2722
2723 fs_fd = -1;
2724
2725 check_2625 (EV_A);
2726
2727 fs_fd = inotify_init ();
2728
2729 if (fs_fd >= 0)
2730 {
2731 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
2732 ev_set_priority (&fs_w, EV_MAXPRI);
2733 ev_io_start (EV_A_ &fs_w);
2734 }
2735}
2736
2737inline_size void
2738infy_fork (EV_P)
2739{
2740 int slot;
2741
2742 if (fs_fd < 0)
2743 return;
2744
2745 close (fs_fd);
2746 fs_fd = inotify_init ();
2747
2748 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
2749 {
2750 WL w_ = fs_hash [slot].head;
2751 fs_hash [slot].head = 0;
2752
2753 while (w_)
2754 {
2755 ev_stat *w = (ev_stat *)w_;
2756 w_ = w_->next; /* lets us add this watcher */
2757
2758 w->wd = -1;
2759
2760 if (fs_fd >= 0)
2761 infy_add (EV_A_ w); /* re-add, no matter what */
2762 else
2763 ev_timer_again (EV_A_ &w->timer);
2764 }
2765 }
2766}
2767
2768#endif
2769
2770#ifdef _WIN32
2771# define EV_LSTAT(p,b) _stati64 (p, b)
2772#else
2773# define EV_LSTAT(p,b) lstat (p, b)
2774#endif
2775
2776void
2777ev_stat_stat (EV_P_ ev_stat *w)
2778{
2779 if (lstat (w->path, &w->attr) < 0)
2780 w->attr.st_nlink = 0;
2781 else if (!w->attr.st_nlink)
2782 w->attr.st_nlink = 1;
2783}
2784
2785static void noinline
2786stat_timer_cb (EV_P_ ev_timer *w_, int revents)
2787{
2788 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
2789
2790 /* we copy this here each the time so that */
2791 /* prev has the old value when the callback gets invoked */
2792 w->prev = w->attr;
2793 ev_stat_stat (EV_A_ w);
2794
2795 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
2796 if (
2797 w->prev.st_dev != w->attr.st_dev
2798 || w->prev.st_ino != w->attr.st_ino
2799 || w->prev.st_mode != w->attr.st_mode
2800 || w->prev.st_nlink != w->attr.st_nlink
2801 || w->prev.st_uid != w->attr.st_uid
2802 || w->prev.st_gid != w->attr.st_gid
2803 || w->prev.st_rdev != w->attr.st_rdev
2804 || w->prev.st_size != w->attr.st_size
2805 || w->prev.st_atime != w->attr.st_atime
2806 || w->prev.st_mtime != w->attr.st_mtime
2807 || w->prev.st_ctime != w->attr.st_ctime
2808 ) {
2809 #if EV_USE_INOTIFY
2810 if (fs_fd >= 0)
2811 {
2812 infy_del (EV_A_ w);
2813 infy_add (EV_A_ w);
2814 ev_stat_stat (EV_A_ w); /* avoid race... */
2815 }
2816 #endif
2817
2818 ev_feed_event (EV_A_ w, EV_STAT);
2819 }
2820}
2821
2822void
2823ev_stat_start (EV_P_ ev_stat *w)
2824{
2825 if (expect_false (ev_is_active (w)))
2826 return;
2827
2828 ev_stat_stat (EV_A_ w);
2829
2830 if (w->interval < MIN_STAT_INTERVAL && w->interval)
2831 w->interval = MIN_STAT_INTERVAL;
2832
2833 ev_timer_init (&w->timer, stat_timer_cb, 0., w->interval ? w->interval : DEF_STAT_INTERVAL);
2834 ev_set_priority (&w->timer, ev_priority (w));
2835
2836#if EV_USE_INOTIFY
2837 infy_init (EV_A);
2838
2839 if (fs_fd >= 0)
2840 infy_add (EV_A_ w);
2841 else
2842#endif
2843 ev_timer_again (EV_A_ &w->timer);
2844
2845 ev_start (EV_A_ (W)w, 1);
2846
2847 EV_FREQUENT_CHECK;
2848}
2849
2850void
2851ev_stat_stop (EV_P_ ev_stat *w)
2852{
2853 clear_pending (EV_A_ (W)w);
2854 if (expect_false (!ev_is_active (w)))
2855 return;
2856
2857 EV_FREQUENT_CHECK;
2858
2859#if EV_USE_INOTIFY
2860 infy_del (EV_A_ w);
2861#endif
2862 ev_timer_stop (EV_A_ &w->timer);
2863
2864 ev_stop (EV_A_ (W)w);
2865
2866 EV_FREQUENT_CHECK;
2867}
2868#endif
2869
2870#if EV_IDLE_ENABLE
2871void
2872ev_idle_start (EV_P_ ev_idle *w)
2873{
2874 if (expect_false (ev_is_active (w)))
2875 return;
2876
2877 pri_adjust (EV_A_ (W)w);
2878
2879 EV_FREQUENT_CHECK;
2880
2881 {
2882 int active = ++idlecnt [ABSPRI (w)];
2883
2884 ++idleall;
2885 ev_start (EV_A_ (W)w, active);
2886
2887 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
2888 idles [ABSPRI (w)][active - 1] = w;
2889 }
2890
2891 EV_FREQUENT_CHECK;
2892}
2893
2894void
2895ev_idle_stop (EV_P_ ev_idle *w)
2896{
2897 clear_pending (EV_A_ (W)w);
2898 if (expect_false (!ev_is_active (w)))
2899 return;
2900
2901 EV_FREQUENT_CHECK;
2902
2903 {
2904 int active = ev_active (w);
2905
2906 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
2907 ev_active (idles [ABSPRI (w)][active - 1]) = active;
2908
2909 ev_stop (EV_A_ (W)w);
2910 --idleall;
2911 }
2912
2913 EV_FREQUENT_CHECK;
2914}
2915#endif
2916
2917void
2918ev_prepare_start (EV_P_ ev_prepare *w)
2919{
2920 if (expect_false (ev_is_active (w)))
2921 return;
2922
2923 EV_FREQUENT_CHECK;
2924
2925 ev_start (EV_A_ (W)w, ++preparecnt);
2926 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
2927 prepares [preparecnt - 1] = w;
2928
2929 EV_FREQUENT_CHECK;
2930}
2931
2932void
2933ev_prepare_stop (EV_P_ ev_prepare *w)
2934{
2935 clear_pending (EV_A_ (W)w);
2936 if (expect_false (!ev_is_active (w)))
2937 return;
2938
2939 EV_FREQUENT_CHECK;
2940
2941 {
2942 int active = ev_active (w);
2943
2944 prepares [active - 1] = prepares [--preparecnt];
2945 ev_active (prepares [active - 1]) = active;
2946 }
2947
2948 ev_stop (EV_A_ (W)w);
2949
2950 EV_FREQUENT_CHECK;
2951}
2952
2953void
2954ev_check_start (EV_P_ ev_check *w)
2955{
2956 if (expect_false (ev_is_active (w)))
2957 return;
2958
2959 EV_FREQUENT_CHECK;
2960
2961 ev_start (EV_A_ (W)w, ++checkcnt);
2962 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
2963 checks [checkcnt - 1] = w;
2964
2965 EV_FREQUENT_CHECK;
2966}
2967
2968void
2969ev_check_stop (EV_P_ ev_check *w)
2970{
2971 clear_pending (EV_A_ (W)w);
2972 if (expect_false (!ev_is_active (w)))
2973 return;
2974
2975 EV_FREQUENT_CHECK;
2976
2977 {
2978 int active = ev_active (w);
2979
2980 checks [active - 1] = checks [--checkcnt];
2981 ev_active (checks [active - 1]) = active;
2982 }
2983
2984 ev_stop (EV_A_ (W)w);
2985
2986 EV_FREQUENT_CHECK;
2987}
2988
2989#if EV_EMBED_ENABLE
2990void noinline
2991ev_embed_sweep (EV_P_ ev_embed *w)
2992{
2993 ev_loop (w->other, EVLOOP_NONBLOCK);
435} 2994}
436 2995
437static void 2996static void
438ev_stop (struct ev_watcher *w) 2997embed_io_cb (EV_P_ ev_io *io, int revents)
439{ 2998{
440 if (w->pending) 2999 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
441 pendings [w->pending - 1].w = 0;
442 3000
443 w->active = 0;
444 /* nop */
445}
446
447void
448evio_start (struct ev_io *w)
449{
450 if (ev_is_active (w)) 3001 if (ev_cb (w))
3002 ev_feed_event (EV_A_ (W)w, EV_EMBED);
3003 else
3004 ev_loop (w->other, EVLOOP_NONBLOCK);
3005}
3006
3007static void
3008embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
3009{
3010 ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
3011
3012 {
3013 struct ev_loop *loop = w->other;
3014
3015 while (fdchangecnt)
3016 {
3017 fd_reify (EV_A);
3018 ev_loop (EV_A_ EVLOOP_NONBLOCK);
3019 }
3020 }
3021}
3022
3023static void
3024embed_fork_cb (EV_P_ ev_fork *fork_w, int revents)
3025{
3026 ev_embed *w = (ev_embed *)(((char *)fork_w) - offsetof (ev_embed, fork));
3027
3028 ev_embed_stop (EV_A_ w);
3029
3030 {
3031 struct ev_loop *loop = w->other;
3032
3033 ev_loop_fork (EV_A);
3034 ev_loop (EV_A_ EVLOOP_NONBLOCK);
3035 }
3036
3037 ev_embed_start (EV_A_ w);
3038}
3039
3040#if 0
3041static void
3042embed_idle_cb (EV_P_ ev_idle *idle, int revents)
3043{
3044 ev_idle_stop (EV_A_ idle);
3045}
3046#endif
3047
3048void
3049ev_embed_start (EV_P_ ev_embed *w)
3050{
3051 if (expect_false (ev_is_active (w)))
451 return; 3052 return;
452 3053
453 int fd = w->fd; 3054 {
3055 struct ev_loop *loop = w->other;
3056 assert (("libev: loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
3057 ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
3058 }
454 3059
455 ev_start ((struct ev_watcher *)w, 1); 3060 EV_FREQUENT_CHECK;
456 array_needsize (anfds, anfdmax, fd + 1, anfds_init);
457 wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w);
458 3061
459 ++fdchangecnt; 3062 ev_set_priority (&w->io, ev_priority (w));
460 array_needsize (fdchanges, fdchangemax, fdchangecnt, ); 3063 ev_io_start (EV_A_ &w->io);
461 fdchanges [fdchangecnt - 1] = fd;
462}
463 3064
3065 ev_prepare_init (&w->prepare, embed_prepare_cb);
3066 ev_set_priority (&w->prepare, EV_MINPRI);
3067 ev_prepare_start (EV_A_ &w->prepare);
3068
3069 ev_fork_init (&w->fork, embed_fork_cb);
3070 ev_fork_start (EV_A_ &w->fork);
3071
3072 /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
3073
3074 ev_start (EV_A_ (W)w, 1);
3075
3076 EV_FREQUENT_CHECK;
3077}
3078
464void 3079void
465evio_stop (struct ev_io *w) 3080ev_embed_stop (EV_P_ ev_embed *w)
466{ 3081{
3082 clear_pending (EV_A_ (W)w);
467 if (!ev_is_active (w)) 3083 if (expect_false (!ev_is_active (w)))
468 return; 3084 return;
469 3085
470 wlist_del ((struct ev_watcher_list **)&anfds[w->fd].head, (struct ev_watcher_list *)w); 3086 EV_FREQUENT_CHECK;
471 ev_stop ((struct ev_watcher *)w);
472 3087
473 ++fdchangecnt; 3088 ev_io_stop (EV_A_ &w->io);
474 array_needsize (fdchanges, fdchangemax, fdchangecnt, ); 3089 ev_prepare_stop (EV_A_ &w->prepare);
475 fdchanges [fdchangecnt - 1] = w->fd; 3090 ev_fork_stop (EV_A_ &w->fork);
476}
477 3091
3092 EV_FREQUENT_CHECK;
3093}
3094#endif
3095
3096#if EV_FORK_ENABLE
478void 3097void
479evtimer_start (struct ev_timer *w) 3098ev_fork_start (EV_P_ ev_fork *w)
480{ 3099{
481 if (ev_is_active (w)) 3100 if (expect_false (ev_is_active (w)))
482 return; 3101 return;
483 3102
484 if (w->is_abs) 3103 EV_FREQUENT_CHECK;
485 {
486 /* this formula differs from the one in timer_reify becuse we do not round up */
487 if (w->repeat)
488 w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;
489 3104
490 ev_start ((struct ev_watcher *)w, ++atimercnt); 3105 ev_start (EV_A_ (W)w, ++forkcnt);
491 array_needsize (atimers, atimermax, atimercnt, ); 3106 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
492 atimers [atimercnt - 1] = w; 3107 forks [forkcnt - 1] = w;
493 upheap (atimers, atimercnt - 1);
494 }
495 else
496 {
497 w->at += now;
498 3108
499 ev_start ((struct ev_watcher *)w, ++rtimercnt); 3109 EV_FREQUENT_CHECK;
500 array_needsize (rtimers, rtimermax, rtimercnt, );
501 rtimers [rtimercnt - 1] = w;
502 upheap (rtimers, rtimercnt - 1);
503 }
504
505} 3110}
506 3111
507void 3112void
508evtimer_stop (struct ev_timer *w) 3113ev_fork_stop (EV_P_ ev_fork *w)
509{ 3114{
3115 clear_pending (EV_A_ (W)w);
510 if (!ev_is_active (w)) 3116 if (expect_false (!ev_is_active (w)))
511 return; 3117 return;
512 3118
513 if (w->is_abs) 3119 EV_FREQUENT_CHECK;
3120
3121 {
3122 int active = ev_active (w);
3123
3124 forks [active - 1] = forks [--forkcnt];
3125 ev_active (forks [active - 1]) = active;
3126 }
3127
3128 ev_stop (EV_A_ (W)w);
3129
3130 EV_FREQUENT_CHECK;
3131}
3132#endif
3133
3134#if EV_ASYNC_ENABLE
3135void
3136ev_async_start (EV_P_ ev_async *w)
3137{
3138 if (expect_false (ev_is_active (w)))
3139 return;
3140
3141 evpipe_init (EV_A);
3142
3143 EV_FREQUENT_CHECK;
3144
3145 ev_start (EV_A_ (W)w, ++asynccnt);
3146 array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
3147 asyncs [asynccnt - 1] = w;
3148
3149 EV_FREQUENT_CHECK;
3150}
3151
3152void
3153ev_async_stop (EV_P_ ev_async *w)
3154{
3155 clear_pending (EV_A_ (W)w);
3156 if (expect_false (!ev_is_active (w)))
3157 return;
3158
3159 EV_FREQUENT_CHECK;
3160
3161 {
3162 int active = ev_active (w);
3163
3164 asyncs [active - 1] = asyncs [--asynccnt];
3165 ev_active (asyncs [active - 1]) = active;
3166 }
3167
3168 ev_stop (EV_A_ (W)w);
3169
3170 EV_FREQUENT_CHECK;
3171}
3172
3173void
3174ev_async_send (EV_P_ ev_async *w)
3175{
3176 w->sent = 1;
3177 evpipe_write (EV_A_ &gotasync);
3178}
3179#endif
3180
3181/*****************************************************************************/
3182
3183struct ev_once
3184{
3185 ev_io io;
3186 ev_timer to;
3187 void (*cb)(int revents, void *arg);
3188 void *arg;
3189};
3190
3191static void
3192once_cb (EV_P_ struct ev_once *once, int revents)
3193{
3194 void (*cb)(int revents, void *arg) = once->cb;
3195 void *arg = once->arg;
3196
3197 ev_io_stop (EV_A_ &once->io);
3198 ev_timer_stop (EV_A_ &once->to);
3199 ev_free (once);
3200
3201 cb (revents, arg);
3202}
3203
3204static void
3205once_cb_io (EV_P_ ev_io *w, int revents)
3206{
3207 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io));
3208
3209 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->to));
3210}
3211
3212static void
3213once_cb_to (EV_P_ ev_timer *w, int revents)
3214{
3215 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to));
3216
3217 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->io));
3218}
3219
3220void
3221ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
3222{
3223 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
3224
3225 if (expect_false (!once))
3226 {
3227 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
3228 return;
514 { 3229 }
515 if (w->active < atimercnt--) 3230
3231 once->cb = cb;
3232 once->arg = arg;
3233
3234 ev_init (&once->io, once_cb_io);
3235 if (fd >= 0)
3236 {
3237 ev_io_set (&once->io, fd, events);
3238 ev_io_start (EV_A_ &once->io);
3239 }
3240
3241 ev_init (&once->to, once_cb_to);
3242 if (timeout >= 0.)
3243 {
3244 ev_timer_set (&once->to, timeout, 0.);
3245 ev_timer_start (EV_A_ &once->to);
3246 }
3247}
3248
3249/*****************************************************************************/
3250
3251#if EV_WALK_ENABLE
3252void
3253ev_walk (EV_P_ int types, void (*cb)(EV_P_ int type, void *w))
3254{
3255 int i, j;
3256 ev_watcher_list *wl, *wn;
3257
3258 if (types & (EV_IO | EV_EMBED))
3259 for (i = 0; i < anfdmax; ++i)
3260 for (wl = anfds [i].head; wl; )
516 { 3261 {
517 atimers [w->active - 1] = atimers [atimercnt]; 3262 wn = wl->next;
518 downheap (atimers, atimercnt, w->active - 1); 3263
3264#if EV_EMBED_ENABLE
3265 if (ev_cb ((ev_io *)wl) == embed_io_cb)
3266 {
3267 if (types & EV_EMBED)
3268 cb (EV_A_ EV_EMBED, ((char *)wl) - offsetof (struct ev_embed, io));
3269 }
3270 else
3271#endif
3272#if EV_USE_INOTIFY
3273 if (ev_cb ((ev_io *)wl) == infy_cb)
3274 ;
3275 else
3276#endif
3277 if ((ev_io *)wl != &pipe_w)
3278 if (types & EV_IO)
3279 cb (EV_A_ EV_IO, wl);
3280
3281 wl = wn;
519 } 3282 }
520 } 3283
521 else 3284 if (types & (EV_TIMER | EV_STAT))
522 { 3285 for (i = timercnt + HEAP0; i-- > HEAP0; )
523 if (w->active < rtimercnt--) 3286#if EV_STAT_ENABLE
3287 /*TODO: timer is not always active*/
3288 if (ev_cb ((ev_timer *)ANHE_w (timers [i])) == stat_timer_cb)
524 { 3289 {
525 rtimers [w->active - 1] = rtimers [rtimercnt]; 3290 if (types & EV_STAT)
526 downheap (rtimers, rtimercnt, w->active - 1); 3291 cb (EV_A_ EV_STAT, ((char *)ANHE_w (timers [i])) - offsetof (struct ev_stat, timer));
527 } 3292 }
528 } 3293 else
3294#endif
3295 if (types & EV_TIMER)
3296 cb (EV_A_ EV_TIMER, ANHE_w (timers [i]));
529 3297
530 ev_stop ((struct ev_watcher *)w); 3298#if EV_PERIODIC_ENABLE
531} 3299 if (types & EV_PERIODIC)
3300 for (i = periodiccnt + HEAP0; i-- > HEAP0; )
3301 cb (EV_A_ EV_PERIODIC, ANHE_w (periodics [i]));
3302#endif
532 3303
533void 3304#if EV_IDLE_ENABLE
534evsignal_start (struct ev_signal *w) 3305 if (types & EV_IDLE)
535{ 3306 for (j = NUMPRI; i--; )
536 if (ev_is_active (w)) 3307 for (i = idlecnt [j]; i--; )
537 return; 3308 cb (EV_A_ EV_IDLE, idles [j][i]);
3309#endif
538 3310
539 ev_start ((struct ev_watcher *)w, 1); 3311#if EV_FORK_ENABLE
540 array_needsize (signals, signalmax, w->signum, signals_init); 3312 if (types & EV_FORK)
541 wlist_add ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w); 3313 for (i = forkcnt; i--; )
542} 3314 if (ev_cb (forks [i]) != embed_fork_cb)
3315 cb (EV_A_ EV_FORK, forks [i]);
3316#endif
543 3317
544void 3318#if EV_ASYNC_ENABLE
545evsignal_stop (struct ev_signal *w) 3319 if (types & EV_ASYNC)
546{ 3320 for (i = asynccnt; i--; )
547 if (!ev_is_active (w)) 3321 cb (EV_A_ EV_ASYNC, asyncs [i]);
548 return; 3322#endif
549 3323
550 wlist_del ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w); 3324 if (types & EV_PREPARE)
551 ev_stop ((struct ev_watcher *)w); 3325 for (i = preparecnt; i--; )
552} 3326#if EV_EMBED_ENABLE
3327 if (ev_cb (prepares [i]) != embed_prepare_cb)
3328#endif
3329 cb (EV_A_ EV_PREPARE, prepares [i]);
553 3330
554/*****************************************************************************/ 3331 if (types & EV_CHECK)
555#if 1 3332 for (i = checkcnt; i--; )
3333 cb (EV_A_ EV_CHECK, checks [i]);
556 3334
557static void 3335 if (types & EV_SIGNAL)
558sin_cb (struct ev_io *w, int revents)
559{
560 fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
561}
562
563static void
564ocb (struct ev_timer *w, int revents)
565{
566 //fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
567 evtimer_stop (w);
568 evtimer_start (w);
569}
570
571int main (void)
572{
573 struct ev_io sin;
574
575 ev_init (0);
576
577 evw_init (&sin, sin_cb, 55);
578 evio_set (&sin, 0, EV_READ);
579 evio_start (&sin);
580
581 struct ev_timer t[10000];
582
583#if 1
584 int i;
585 for (i = 0; i < 10000; ++i) 3336 for (i = 0; i < signalmax; ++i)
586 { 3337 for (wl = signals [i].head; wl; )
587 struct ev_timer *w = t + i; 3338 {
588 evw_init (w, ocb, i); 3339 wn = wl->next;
589 evtimer_set_abs (w, drand48 (), 0.99775533); 3340 cb (EV_A_ EV_SIGNAL, wl);
590 evtimer_start (w); 3341 wl = wn;
591 if (drand48 () < 0.5) 3342 }
592 evtimer_stop (w);
593 }
594#endif
595 3343
596 struct ev_timer t1; 3344 if (types & EV_CHILD)
597 evw_init (&t1, ocb, 0); 3345 for (i = EV_PID_HASHSIZE; i--; )
598 evtimer_set_abs (&t1, 5, 10); 3346 for (wl = childs [i]; wl; )
599 evtimer_start (&t1); 3347 {
600 3348 wn = wl->next;
601 ev_loop (0); 3349 cb (EV_A_ EV_CHILD, wl);
602 3350 wl = wn;
603 return 0; 3351 }
3352/* EV_STAT 0x00001000 /* stat data changed */
3353/* EV_EMBED 0x00010000 /* embedded event loop needs sweep */
604} 3354}
605
606#endif 3355#endif
607 3356
3357#if EV_MULTIPLICITY
3358 #include "ev_wrap.h"
3359#endif
608 3360
3361#ifdef __cplusplus
3362}
3363#endif
609 3364
610

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