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Revision: 1.303
Committed: Sun Jul 19 01:36:34 2009 UTC (15 years ago) by root
Content type: text/plain
Branch: MAIN
Changes since 1.302: +121 -13 lines
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File Contents

# Content
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
41 extern "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_SIGNALFD
139 # if HAVE_SIGNALFD && HAVE_SYS_SIGNALFD_H
140 # define EV_USE_SIGNALFD 1
141 # else
142 # define EV_USE_SIGNALFD 0
143 # endif
144 # endif
145
146 # ifndef EV_USE_EVENTFD
147 # if HAVE_EVENTFD
148 # define EV_USE_EVENTFD 1
149 # else
150 # define EV_USE_EVENTFD 0
151 # endif
152 # endif
153
154 #endif
155
156 #include <math.h>
157 #include <stdlib.h>
158 #include <fcntl.h>
159 #include <stddef.h>
160
161 #include <stdio.h>
162
163 #include <assert.h>
164 #include <errno.h>
165 #include <sys/types.h>
166 #include <time.h>
167
168 #include <signal.h>
169
170 #ifdef EV_H
171 # include EV_H
172 #else
173 # include "ev.h"
174 #endif
175
176 #ifndef _WIN32
177 # include <sys/time.h>
178 # include <sys/wait.h>
179 # include <unistd.h>
180 #else
181 # include <io.h>
182 # define WIN32_LEAN_AND_MEAN
183 # include <windows.h>
184 # ifndef EV_SELECT_IS_WINSOCKET
185 # define EV_SELECT_IS_WINSOCKET 1
186 # endif
187 #endif
188
189 /* this block tries to deduce configuration from header-defined symbols and defaults */
190
191 #ifndef EV_USE_CLOCK_SYSCALL
192 # if __linux && __GLIBC__ >= 2
193 # define EV_USE_CLOCK_SYSCALL 1
194 # else
195 # define EV_USE_CLOCK_SYSCALL 0
196 # endif
197 #endif
198
199 #ifndef EV_USE_MONOTONIC
200 # if defined (_POSIX_MONOTONIC_CLOCK) && _POSIX_MONOTONIC_CLOCK >= 0
201 # define EV_USE_MONOTONIC 1
202 # else
203 # define EV_USE_MONOTONIC 0
204 # endif
205 #endif
206
207 #ifndef EV_USE_REALTIME
208 # define EV_USE_REALTIME !EV_USE_CLOCK_SYSCALL
209 #endif
210
211 #ifndef EV_USE_NANOSLEEP
212 # if _POSIX_C_SOURCE >= 199309L
213 # define EV_USE_NANOSLEEP 1
214 # else
215 # define EV_USE_NANOSLEEP 0
216 # endif
217 #endif
218
219 #ifndef EV_USE_SELECT
220 # define EV_USE_SELECT 1
221 #endif
222
223 #ifndef EV_USE_POLL
224 # ifdef _WIN32
225 # define EV_USE_POLL 0
226 # else
227 # define EV_USE_POLL 1
228 # endif
229 #endif
230
231 #ifndef EV_USE_EPOLL
232 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
233 # define EV_USE_EPOLL 1
234 # else
235 # define EV_USE_EPOLL 0
236 # endif
237 #endif
238
239 #ifndef EV_USE_KQUEUE
240 # define EV_USE_KQUEUE 0
241 #endif
242
243 #ifndef EV_USE_PORT
244 # define EV_USE_PORT 0
245 #endif
246
247 #ifndef EV_USE_INOTIFY
248 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
249 # define EV_USE_INOTIFY 1
250 # else
251 # define EV_USE_INOTIFY 0
252 # endif
253 #endif
254
255 #ifndef EV_PID_HASHSIZE
256 # if EV_MINIMAL
257 # define EV_PID_HASHSIZE 1
258 # else
259 # define EV_PID_HASHSIZE 16
260 # endif
261 #endif
262
263 #ifndef EV_INOTIFY_HASHSIZE
264 # if EV_MINIMAL
265 # define EV_INOTIFY_HASHSIZE 1
266 # else
267 # define EV_INOTIFY_HASHSIZE 16
268 # endif
269 #endif
270
271 #ifndef EV_USE_EVENTFD
272 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
273 # define EV_USE_EVENTFD 1
274 # else
275 # define EV_USE_EVENTFD 0
276 # endif
277 #endif
278
279 #ifndef EV_USE_SIGNALFD
280 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 9))
281 # define EV_USE_SIGNALFD 1
282 # else
283 # define EV_USE_SIGNALFD 0
284 # endif
285 #endif
286
287 #if 0 /* debugging */
288 # define EV_VERIFY 3
289 # define EV_USE_4HEAP 1
290 # define EV_HEAP_CACHE_AT 1
291 #endif
292
293 #ifndef EV_VERIFY
294 # define EV_VERIFY !EV_MINIMAL
295 #endif
296
297 #ifndef EV_USE_4HEAP
298 # define EV_USE_4HEAP !EV_MINIMAL
299 #endif
300
301 #ifndef EV_HEAP_CACHE_AT
302 # define EV_HEAP_CACHE_AT !EV_MINIMAL
303 #endif
304
305 /* on linux, we can use a (slow) syscall to avoid a dependency on pthread, */
306 /* which makes programs even slower. might work on other unices, too. */
307 #if EV_USE_CLOCK_SYSCALL
308 # include <syscall.h>
309 # ifdef SYS_clock_gettime
310 # define clock_gettime(id, ts) syscall (SYS_clock_gettime, (id), (ts))
311 # undef EV_USE_MONOTONIC
312 # define EV_USE_MONOTONIC 1
313 # else
314 # undef EV_USE_CLOCK_SYSCALL
315 # define EV_USE_CLOCK_SYSCALL 0
316 # endif
317 #endif
318
319 /* this block fixes any misconfiguration where we know we run into trouble otherwise */
320
321 #ifndef CLOCK_MONOTONIC
322 # undef EV_USE_MONOTONIC
323 # define EV_USE_MONOTONIC 0
324 #endif
325
326 #ifndef CLOCK_REALTIME
327 # undef EV_USE_REALTIME
328 # define EV_USE_REALTIME 0
329 #endif
330
331 #if !EV_STAT_ENABLE
332 # undef EV_USE_INOTIFY
333 # define EV_USE_INOTIFY 0
334 #endif
335
336 #if !EV_USE_NANOSLEEP
337 # ifndef _WIN32
338 # include <sys/select.h>
339 # endif
340 #endif
341
342 #if EV_USE_INOTIFY
343 # include <sys/utsname.h>
344 # include <sys/statfs.h>
345 # include <sys/inotify.h>
346 /* some very old inotify.h headers don't have IN_DONT_FOLLOW */
347 # ifndef IN_DONT_FOLLOW
348 # undef EV_USE_INOTIFY
349 # define EV_USE_INOTIFY 0
350 # endif
351 #endif
352
353 #if EV_SELECT_IS_WINSOCKET
354 # include <winsock.h>
355 #endif
356
357 #if EV_USE_EVENTFD
358 /* our minimum requirement is glibc 2.7 which has the stub, but not the header */
359 # include <stdint.h>
360 # ifndef EFD_NONBLOCK
361 # define EFD_NONBLOCK O_NONBLOCK
362 # endif
363 # ifndef EFD_CLOEXEC
364 # define EFD_CLOEXEC O_CLOEXEC
365 # endif
366 # ifdef __cplusplus
367 extern "C" {
368 # endif
369 int eventfd (unsigned int initval, int flags);
370 # ifdef __cplusplus
371 }
372 # endif
373 #endif
374
375 #if EV_USE_SIGNALFD
376 # include <sys/signalfd.h>
377 #endif
378
379 /**/
380
381 #if EV_VERIFY >= 3
382 # define EV_FREQUENT_CHECK ev_loop_verify (EV_A)
383 #else
384 # define EV_FREQUENT_CHECK do { } while (0)
385 #endif
386
387 /*
388 * This is used to avoid floating point rounding problems.
389 * It is added to ev_rt_now when scheduling periodics
390 * to ensure progress, time-wise, even when rounding
391 * errors are against us.
392 * This value is good at least till the year 4000.
393 * Better solutions welcome.
394 */
395 #define TIME_EPSILON 0.0001220703125 /* 1/8192 */
396
397 #define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
398 #define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
399 /*#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds, TODO */
400
401 #if __GNUC__ >= 4
402 # define expect(expr,value) __builtin_expect ((expr),(value))
403 # define noinline __attribute__ ((noinline))
404 #else
405 # define expect(expr,value) (expr)
406 # define noinline
407 # if __STDC_VERSION__ < 199901L && __GNUC__ < 2
408 # define inline
409 # endif
410 #endif
411
412 #define expect_false(expr) expect ((expr) != 0, 0)
413 #define expect_true(expr) expect ((expr) != 0, 1)
414 #define inline_size static inline
415
416 #if EV_MINIMAL
417 # define inline_speed static noinline
418 #else
419 # define inline_speed static inline
420 #endif
421
422 #define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
423
424 #if EV_MINPRI == EV_MAXPRI
425 # define ABSPRI(w) (((W)w), 0)
426 #else
427 # define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
428 #endif
429
430 #define EMPTY /* required for microsofts broken pseudo-c compiler */
431 #define EMPTY2(a,b) /* used to suppress some warnings */
432
433 typedef ev_watcher *W;
434 typedef ev_watcher_list *WL;
435 typedef ev_watcher_time *WT;
436
437 #define ev_active(w) ((W)(w))->active
438 #define ev_at(w) ((WT)(w))->at
439
440 #if EV_USE_REALTIME
441 /* sig_atomic_t is used to avoid per-thread variables or locking but still */
442 /* giving it a reasonably high chance of working on typical architetcures */
443 static EV_ATOMIC_T have_realtime; /* did clock_gettime (CLOCK_REALTIME) work? */
444 #endif
445
446 #if EV_USE_MONOTONIC
447 static EV_ATOMIC_T have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
448 #endif
449
450 #ifdef _WIN32
451 # include "ev_win32.c"
452 #endif
453
454 /*****************************************************************************/
455
456 static void (*syserr_cb)(const char *msg);
457
458 void
459 ev_set_syserr_cb (void (*cb)(const char *msg))
460 {
461 syserr_cb = cb;
462 }
463
464 static void noinline
465 ev_syserr (const char *msg)
466 {
467 if (!msg)
468 msg = "(libev) system error";
469
470 if (syserr_cb)
471 syserr_cb (msg);
472 else
473 {
474 perror (msg);
475 abort ();
476 }
477 }
478
479 static void *
480 ev_realloc_emul (void *ptr, long size)
481 {
482 /* some systems, notably openbsd and darwin, fail to properly
483 * implement realloc (x, 0) (as required by both ansi c-98 and
484 * the single unix specification, so work around them here.
485 */
486
487 if (size)
488 return realloc (ptr, size);
489
490 free (ptr);
491 return 0;
492 }
493
494 static void *(*alloc)(void *ptr, long size) = ev_realloc_emul;
495
496 void
497 ev_set_allocator (void *(*cb)(void *ptr, long size))
498 {
499 alloc = cb;
500 }
501
502 inline_speed void *
503 ev_realloc (void *ptr, long size)
504 {
505 ptr = alloc (ptr, size);
506
507 if (!ptr && size)
508 {
509 fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
510 abort ();
511 }
512
513 return ptr;
514 }
515
516 #define ev_malloc(size) ev_realloc (0, (size))
517 #define ev_free(ptr) ev_realloc ((ptr), 0)
518
519 /*****************************************************************************/
520
521 /* set in reify when reification needed */
522 #define EV_ANFD_REIFY 1
523
524 /* file descriptor info structure */
525 typedef struct
526 {
527 WL head;
528 unsigned char events; /* the events watched for */
529 unsigned char reify; /* flag set when this ANFD needs reification (EV_ANFD_REIFY, EV__IOFDSET) */
530 unsigned char emask; /* the epoll backend stores the actual kernel mask in here */
531 unsigned char unused;
532 #if EV_USE_EPOLL
533 unsigned int egen; /* generation counter to counter epoll bugs */
534 #endif
535 #if EV_SELECT_IS_WINSOCKET
536 SOCKET handle;
537 #endif
538 } ANFD;
539
540 /* stores the pending event set for a given watcher */
541 typedef struct
542 {
543 W w;
544 int events; /* the pending event set for the given watcher */
545 } ANPENDING;
546
547 #if EV_USE_INOTIFY
548 /* hash table entry per inotify-id */
549 typedef struct
550 {
551 WL head;
552 } ANFS;
553 #endif
554
555 /* Heap Entry */
556 #if EV_HEAP_CACHE_AT
557 /* a heap element */
558 typedef struct {
559 ev_tstamp at;
560 WT w;
561 } ANHE;
562
563 #define ANHE_w(he) (he).w /* access watcher, read-write */
564 #define ANHE_at(he) (he).at /* access cached at, read-only */
565 #define ANHE_at_cache(he) (he).at = (he).w->at /* update at from watcher */
566 #else
567 /* a heap element */
568 typedef WT ANHE;
569
570 #define ANHE_w(he) (he)
571 #define ANHE_at(he) (he)->at
572 #define ANHE_at_cache(he)
573 #endif
574
575 #if EV_MULTIPLICITY
576
577 struct ev_loop
578 {
579 ev_tstamp ev_rt_now;
580 #define ev_rt_now ((loop)->ev_rt_now)
581 #define VAR(name,decl) decl;
582 #include "ev_vars.h"
583 #undef VAR
584 };
585 #include "ev_wrap.h"
586
587 static struct ev_loop default_loop_struct;
588 struct ev_loop *ev_default_loop_ptr;
589
590 #else
591
592 ev_tstamp ev_rt_now;
593 #define VAR(name,decl) static decl;
594 #include "ev_vars.h"
595 #undef VAR
596
597 static int ev_default_loop_ptr;
598
599 #endif
600
601 #if EV_MINIMAL < 2
602 # define EV_RELEASE_CB if (expect_false (release_cb)) release_cb (EV_A)
603 # define EV_ACQUIRE_CB if (expect_false (acquire_cb)) acquire_cb (EV_A)
604 # define EV_INVOKE_PENDING invoke_cb (EV_A)
605 #else
606 # define EV_RELEASE_CB (void)0
607 # define EV_ACQUIRE_CB (void)0
608 # define EV_INVOKE_PENDING ev_invoke_pending (EV_A)
609 #endif
610
611 #define EVUNLOOP_RECURSE 0x80
612
613 /*****************************************************************************/
614
615 #ifndef EV_HAVE_EV_TIME
616 ev_tstamp
617 ev_time (void)
618 {
619 #if EV_USE_REALTIME
620 if (expect_true (have_realtime))
621 {
622 struct timespec ts;
623 clock_gettime (CLOCK_REALTIME, &ts);
624 return ts.tv_sec + ts.tv_nsec * 1e-9;
625 }
626 #endif
627
628 struct timeval tv;
629 gettimeofday (&tv, 0);
630 return tv.tv_sec + tv.tv_usec * 1e-6;
631 }
632 #endif
633
634 inline_size ev_tstamp
635 get_clock (void)
636 {
637 #if EV_USE_MONOTONIC
638 if (expect_true (have_monotonic))
639 {
640 struct timespec ts;
641 clock_gettime (CLOCK_MONOTONIC, &ts);
642 return ts.tv_sec + ts.tv_nsec * 1e-9;
643 }
644 #endif
645
646 return ev_time ();
647 }
648
649 #if EV_MULTIPLICITY
650 ev_tstamp
651 ev_now (EV_P)
652 {
653 return ev_rt_now;
654 }
655 #endif
656
657 void
658 ev_sleep (ev_tstamp delay)
659 {
660 if (delay > 0.)
661 {
662 #if EV_USE_NANOSLEEP
663 struct timespec ts;
664
665 ts.tv_sec = (time_t)delay;
666 ts.tv_nsec = (long)((delay - (ev_tstamp)(ts.tv_sec)) * 1e9);
667
668 nanosleep (&ts, 0);
669 #elif defined(_WIN32)
670 Sleep ((unsigned long)(delay * 1e3));
671 #else
672 struct timeval tv;
673
674 tv.tv_sec = (time_t)delay;
675 tv.tv_usec = (long)((delay - (ev_tstamp)(tv.tv_sec)) * 1e6);
676
677 /* here we rely on sys/time.h + sys/types.h + unistd.h providing select */
678 /* something not guaranteed by newer posix versions, but guaranteed */
679 /* by older ones */
680 select (0, 0, 0, 0, &tv);
681 #endif
682 }
683 }
684
685 /*****************************************************************************/
686
687 #define MALLOC_ROUND 4096 /* prefer to allocate in chunks of this size, must be 2**n and >> 4 longs */
688
689 /* find a suitable new size for the given array, */
690 /* hopefully by rounding to a ncie-to-malloc size */
691 inline_size int
692 array_nextsize (int elem, int cur, int cnt)
693 {
694 int ncur = cur + 1;
695
696 do
697 ncur <<= 1;
698 while (cnt > ncur);
699
700 /* if size is large, round to MALLOC_ROUND - 4 * longs to accomodate malloc overhead */
701 if (elem * ncur > MALLOC_ROUND - sizeof (void *) * 4)
702 {
703 ncur *= elem;
704 ncur = (ncur + elem + (MALLOC_ROUND - 1) + sizeof (void *) * 4) & ~(MALLOC_ROUND - 1);
705 ncur = ncur - sizeof (void *) * 4;
706 ncur /= elem;
707 }
708
709 return ncur;
710 }
711
712 static noinline void *
713 array_realloc (int elem, void *base, int *cur, int cnt)
714 {
715 *cur = array_nextsize (elem, *cur, cnt);
716 return ev_realloc (base, elem * *cur);
717 }
718
719 #define array_init_zero(base,count) \
720 memset ((void *)(base), 0, sizeof (*(base)) * (count))
721
722 #define array_needsize(type,base,cur,cnt,init) \
723 if (expect_false ((cnt) > (cur))) \
724 { \
725 int ocur_ = (cur); \
726 (base) = (type *)array_realloc \
727 (sizeof (type), (base), &(cur), (cnt)); \
728 init ((base) + (ocur_), (cur) - ocur_); \
729 }
730
731 #if 0
732 #define array_slim(type,stem) \
733 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
734 { \
735 stem ## max = array_roundsize (stem ## cnt >> 1); \
736 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
737 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
738 }
739 #endif
740
741 #define array_free(stem, idx) \
742 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0; stem ## s idx = 0
743
744 /*****************************************************************************/
745
746 /* dummy callback for pending events */
747 static void noinline
748 pendingcb (EV_P_ ev_prepare *w, int revents)
749 {
750 }
751
752 void noinline
753 ev_feed_event (EV_P_ void *w, int revents)
754 {
755 W w_ = (W)w;
756 int pri = ABSPRI (w_);
757
758 if (expect_false (w_->pending))
759 pendings [pri][w_->pending - 1].events |= revents;
760 else
761 {
762 w_->pending = ++pendingcnt [pri];
763 array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
764 pendings [pri][w_->pending - 1].w = w_;
765 pendings [pri][w_->pending - 1].events = revents;
766 }
767 }
768
769 inline_speed void
770 feed_reverse (EV_P_ W w)
771 {
772 array_needsize (W, rfeeds, rfeedmax, rfeedcnt + 1, EMPTY2);
773 rfeeds [rfeedcnt++] = w;
774 }
775
776 inline_size void
777 feed_reverse_done (EV_P_ int revents)
778 {
779 do
780 ev_feed_event (EV_A_ rfeeds [--rfeedcnt], revents);
781 while (rfeedcnt);
782 }
783
784 inline_speed void
785 queue_events (EV_P_ W *events, int eventcnt, int type)
786 {
787 int i;
788
789 for (i = 0; i < eventcnt; ++i)
790 ev_feed_event (EV_A_ events [i], type);
791 }
792
793 /*****************************************************************************/
794
795 inline_speed void
796 fd_event_nc (EV_P_ int fd, int revents)
797 {
798 ANFD *anfd = anfds + fd;
799 ev_io *w;
800
801 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
802 {
803 int ev = w->events & revents;
804
805 if (ev)
806 ev_feed_event (EV_A_ (W)w, ev);
807 }
808 }
809
810 /* do not submit kernel events for fds that have reify set */
811 /* because that means they changed while we were polling for new events */
812 inline_speed void
813 fd_event (EV_P_ int fd, int revents)
814 {
815 ANFD *anfd = anfds + fd;
816
817 if (expect_true (!anfd->reify))
818 fd_event_nc (EV_A_ fd, revents);
819 }
820
821 void
822 ev_feed_fd_event (EV_P_ int fd, int revents)
823 {
824 if (fd >= 0 && fd < anfdmax)
825 fd_event_nc (EV_A_ fd, revents);
826 }
827
828 /* make sure the external fd watch events are in-sync */
829 /* with the kernel/libev internal state */
830 inline_size void
831 fd_reify (EV_P)
832 {
833 int i;
834
835 for (i = 0; i < fdchangecnt; ++i)
836 {
837 int fd = fdchanges [i];
838 ANFD *anfd = anfds + fd;
839 ev_io *w;
840
841 unsigned char events = 0;
842
843 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
844 events |= (unsigned char)w->events;
845
846 #if EV_SELECT_IS_WINSOCKET
847 if (events)
848 {
849 unsigned long arg;
850 #ifdef EV_FD_TO_WIN32_HANDLE
851 anfd->handle = EV_FD_TO_WIN32_HANDLE (fd);
852 #else
853 anfd->handle = _get_osfhandle (fd);
854 #endif
855 assert (("libev: only socket fds supported in this configuration", ioctlsocket (anfd->handle, FIONREAD, &arg) == 0));
856 }
857 #endif
858
859 {
860 unsigned char o_events = anfd->events;
861 unsigned char o_reify = anfd->reify;
862
863 anfd->reify = 0;
864 anfd->events = events;
865
866 if (o_events != events || o_reify & EV__IOFDSET)
867 backend_modify (EV_A_ fd, o_events, events);
868 }
869 }
870
871 fdchangecnt = 0;
872 }
873
874 /* something about the given fd changed */
875 inline_size void
876 fd_change (EV_P_ int fd, int flags)
877 {
878 unsigned char reify = anfds [fd].reify;
879 anfds [fd].reify |= flags;
880
881 if (expect_true (!reify))
882 {
883 ++fdchangecnt;
884 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
885 fdchanges [fdchangecnt - 1] = fd;
886 }
887 }
888
889 /* the given fd is invalid/unusable, so make sure it doesn't hurt us anymore */
890 inline_speed void
891 fd_kill (EV_P_ int fd)
892 {
893 ev_io *w;
894
895 while ((w = (ev_io *)anfds [fd].head))
896 {
897 ev_io_stop (EV_A_ w);
898 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
899 }
900 }
901
902 /* check whether the given fd is atcually valid, for error recovery */
903 inline_size int
904 fd_valid (int fd)
905 {
906 #ifdef _WIN32
907 return _get_osfhandle (fd) != -1;
908 #else
909 return fcntl (fd, F_GETFD) != -1;
910 #endif
911 }
912
913 /* called on EBADF to verify fds */
914 static void noinline
915 fd_ebadf (EV_P)
916 {
917 int fd;
918
919 for (fd = 0; fd < anfdmax; ++fd)
920 if (anfds [fd].events)
921 if (!fd_valid (fd) && errno == EBADF)
922 fd_kill (EV_A_ fd);
923 }
924
925 /* called on ENOMEM in select/poll to kill some fds and retry */
926 static void noinline
927 fd_enomem (EV_P)
928 {
929 int fd;
930
931 for (fd = anfdmax; fd--; )
932 if (anfds [fd].events)
933 {
934 fd_kill (EV_A_ fd);
935 return;
936 }
937 }
938
939 /* usually called after fork if backend needs to re-arm all fds from scratch */
940 static void noinline
941 fd_rearm_all (EV_P)
942 {
943 int fd;
944
945 for (fd = 0; fd < anfdmax; ++fd)
946 if (anfds [fd].events)
947 {
948 anfds [fd].events = 0;
949 anfds [fd].emask = 0;
950 fd_change (EV_A_ fd, EV__IOFDSET | EV_ANFD_REIFY);
951 }
952 }
953
954 /*****************************************************************************/
955
956 /*
957 * the heap functions want a real array index. array index 0 uis guaranteed to not
958 * be in-use at any time. the first heap entry is at array [HEAP0]. DHEAP gives
959 * the branching factor of the d-tree.
960 */
961
962 /*
963 * at the moment we allow libev the luxury of two heaps,
964 * a small-code-size 2-heap one and a ~1.5kb larger 4-heap
965 * which is more cache-efficient.
966 * the difference is about 5% with 50000+ watchers.
967 */
968 #if EV_USE_4HEAP
969
970 #define DHEAP 4
971 #define HEAP0 (DHEAP - 1) /* index of first element in heap */
972 #define HPARENT(k) ((((k) - HEAP0 - 1) / DHEAP) + HEAP0)
973 #define UPHEAP_DONE(p,k) ((p) == (k))
974
975 /* away from the root */
976 inline_speed void
977 downheap (ANHE *heap, int N, int k)
978 {
979 ANHE he = heap [k];
980 ANHE *E = heap + N + HEAP0;
981
982 for (;;)
983 {
984 ev_tstamp minat;
985 ANHE *minpos;
986 ANHE *pos = heap + DHEAP * (k - HEAP0) + HEAP0 + 1;
987
988 /* find minimum child */
989 if (expect_true (pos + DHEAP - 1 < E))
990 {
991 /* fast path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
992 if ( ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
993 if ( ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
994 if ( ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
995 }
996 else if (pos < E)
997 {
998 /* slow path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
999 if (pos + 1 < E && ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1000 if (pos + 2 < E && ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1001 if (pos + 3 < E && ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1002 }
1003 else
1004 break;
1005
1006 if (ANHE_at (he) <= minat)
1007 break;
1008
1009 heap [k] = *minpos;
1010 ev_active (ANHE_w (*minpos)) = k;
1011
1012 k = minpos - heap;
1013 }
1014
1015 heap [k] = he;
1016 ev_active (ANHE_w (he)) = k;
1017 }
1018
1019 #else /* 4HEAP */
1020
1021 #define HEAP0 1
1022 #define HPARENT(k) ((k) >> 1)
1023 #define UPHEAP_DONE(p,k) (!(p))
1024
1025 /* away from the root */
1026 inline_speed void
1027 downheap (ANHE *heap, int N, int k)
1028 {
1029 ANHE he = heap [k];
1030
1031 for (;;)
1032 {
1033 int c = k << 1;
1034
1035 if (c > N + HEAP0 - 1)
1036 break;
1037
1038 c += c + 1 < N + HEAP0 && ANHE_at (heap [c]) > ANHE_at (heap [c + 1])
1039 ? 1 : 0;
1040
1041 if (ANHE_at (he) <= ANHE_at (heap [c]))
1042 break;
1043
1044 heap [k] = heap [c];
1045 ev_active (ANHE_w (heap [k])) = k;
1046
1047 k = c;
1048 }
1049
1050 heap [k] = he;
1051 ev_active (ANHE_w (he)) = k;
1052 }
1053 #endif
1054
1055 /* towards the root */
1056 inline_speed void
1057 upheap (ANHE *heap, int k)
1058 {
1059 ANHE he = heap [k];
1060
1061 for (;;)
1062 {
1063 int p = HPARENT (k);
1064
1065 if (UPHEAP_DONE (p, k) || ANHE_at (heap [p]) <= ANHE_at (he))
1066 break;
1067
1068 heap [k] = heap [p];
1069 ev_active (ANHE_w (heap [k])) = k;
1070 k = p;
1071 }
1072
1073 heap [k] = he;
1074 ev_active (ANHE_w (he)) = k;
1075 }
1076
1077 /* move an element suitably so it is in a correct place */
1078 inline_size void
1079 adjustheap (ANHE *heap, int N, int k)
1080 {
1081 if (k > HEAP0 && ANHE_at (heap [HPARENT (k)]) >= ANHE_at (heap [k]))
1082 upheap (heap, k);
1083 else
1084 downheap (heap, N, k);
1085 }
1086
1087 /* rebuild the heap: this function is used only once and executed rarely */
1088 inline_size void
1089 reheap (ANHE *heap, int N)
1090 {
1091 int i;
1092
1093 /* we don't use floyds algorithm, upheap is simpler and is more cache-efficient */
1094 /* also, this is easy to implement and correct for both 2-heaps and 4-heaps */
1095 for (i = 0; i < N; ++i)
1096 upheap (heap, i + HEAP0);
1097 }
1098
1099 /*****************************************************************************/
1100
1101 /* associate signal watchers to a signal signal */
1102 typedef struct
1103 {
1104 WL head;
1105 EV_ATOMIC_T gotsig;
1106 } ANSIG;
1107
1108 static ANSIG *signals;
1109 static int signalmax;
1110
1111 static EV_ATOMIC_T gotsig;
1112
1113 /*****************************************************************************/
1114
1115 /* used to prepare libev internal fd's */
1116 /* this is not fork-safe */
1117 inline_speed void
1118 fd_intern (int fd)
1119 {
1120 #ifdef _WIN32
1121 unsigned long arg = 1;
1122 ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
1123 #else
1124 fcntl (fd, F_SETFD, FD_CLOEXEC);
1125 fcntl (fd, F_SETFL, O_NONBLOCK);
1126 #endif
1127 }
1128
1129 static void noinline
1130 evpipe_init (EV_P)
1131 {
1132 if (!ev_is_active (&pipe_w))
1133 {
1134 #if EV_USE_EVENTFD
1135 evfd = eventfd (0, EFD_NONBLOCK | EFD_CLOEXEC);
1136 if (evfd < 0 && errno == EINVAL)
1137 evfd = eventfd (0, 0);
1138
1139 if (evfd >= 0)
1140 {
1141 evpipe [0] = -1;
1142 fd_intern (evfd); /* doing it twice doesn't hurt */
1143 ev_io_set (&pipe_w, evfd, EV_READ);
1144 }
1145 else
1146 #endif
1147 {
1148 while (pipe (evpipe))
1149 ev_syserr ("(libev) error creating signal/async pipe");
1150
1151 fd_intern (evpipe [0]);
1152 fd_intern (evpipe [1]);
1153 ev_io_set (&pipe_w, evpipe [0], EV_READ);
1154 }
1155
1156 ev_io_start (EV_A_ &pipe_w);
1157 ev_unref (EV_A); /* watcher should not keep loop alive */
1158 }
1159 }
1160
1161 inline_size void
1162 evpipe_write (EV_P_ EV_ATOMIC_T *flag)
1163 {
1164 if (!*flag)
1165 {
1166 int old_errno = errno; /* save errno because write might clobber it */
1167
1168 *flag = 1;
1169
1170 #if EV_USE_EVENTFD
1171 if (evfd >= 0)
1172 {
1173 uint64_t counter = 1;
1174 write (evfd, &counter, sizeof (uint64_t));
1175 }
1176 else
1177 #endif
1178 write (evpipe [1], &old_errno, 1);
1179
1180 errno = old_errno;
1181 }
1182 }
1183
1184 /* called whenever the libev signal pipe */
1185 /* got some events (signal, async) */
1186 static void
1187 pipecb (EV_P_ ev_io *iow, int revents)
1188 {
1189 #if EV_USE_EVENTFD
1190 if (evfd >= 0)
1191 {
1192 uint64_t counter;
1193 read (evfd, &counter, sizeof (uint64_t));
1194 }
1195 else
1196 #endif
1197 {
1198 char dummy;
1199 read (evpipe [0], &dummy, 1);
1200 }
1201
1202 if (gotsig && ev_is_default_loop (EV_A))
1203 {
1204 int signum;
1205 gotsig = 0;
1206
1207 for (signum = signalmax; signum--; )
1208 if (signals [signum].gotsig)
1209 ev_feed_signal_event (EV_A_ signum + 1);
1210 }
1211
1212 #if EV_ASYNC_ENABLE
1213 if (gotasync)
1214 {
1215 int i;
1216 gotasync = 0;
1217
1218 for (i = asynccnt; i--; )
1219 if (asyncs [i]->sent)
1220 {
1221 asyncs [i]->sent = 0;
1222 ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
1223 }
1224 }
1225 #endif
1226 }
1227
1228 /*****************************************************************************/
1229
1230 static void
1231 ev_sighandler (int signum)
1232 {
1233 #if EV_MULTIPLICITY
1234 struct ev_loop *loop = &default_loop_struct;
1235 #endif
1236
1237 #if _WIN32
1238 signal (signum, ev_sighandler);
1239 #endif
1240
1241 signals [signum - 1].gotsig = 1;
1242 evpipe_write (EV_A_ &gotsig);
1243 }
1244
1245 void noinline
1246 ev_feed_signal_event (EV_P_ int signum)
1247 {
1248 WL w;
1249
1250 #if EV_MULTIPLICITY
1251 assert (("libev: feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
1252 #endif
1253
1254 --signum;
1255
1256 if (signum < 0 || signum >= signalmax)
1257 return;
1258
1259 signals [signum].gotsig = 0;
1260
1261 for (w = signals [signum].head; w; w = w->next)
1262 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
1263 }
1264
1265 #if EV_USE_SIGNALFD
1266 static void
1267 sigfdcb (EV_P_ ev_io *iow, int revents)
1268 {
1269 struct signalfd_siginfo si[4], *sip;
1270
1271 for (;;)
1272 {
1273 ssize_t res = read (sigfd, si, sizeof (si));
1274
1275 /* not ISO-C, as res might be -1, but works with SuS */
1276 for (sip = si; (char *)sip < (char *)si + res; ++sip)
1277 ev_feed_signal_event (EV_A_ sip->ssi_signo);
1278
1279 if (res < (ssize_t)sizeof (si))
1280 break;
1281 }
1282 }
1283 #endif
1284
1285 /*****************************************************************************/
1286
1287 static WL childs [EV_PID_HASHSIZE];
1288
1289 #ifndef _WIN32
1290
1291 static ev_signal childev;
1292
1293 #ifndef WIFCONTINUED
1294 # define WIFCONTINUED(status) 0
1295 #endif
1296
1297 /* handle a single child status event */
1298 inline_speed void
1299 child_reap (EV_P_ int chain, int pid, int status)
1300 {
1301 ev_child *w;
1302 int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
1303
1304 for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
1305 {
1306 if ((w->pid == pid || !w->pid)
1307 && (!traced || (w->flags & 1)))
1308 {
1309 ev_set_priority (w, EV_MAXPRI); /* need to do it *now*, this *must* be the same prio as the signal watcher itself */
1310 w->rpid = pid;
1311 w->rstatus = status;
1312 ev_feed_event (EV_A_ (W)w, EV_CHILD);
1313 }
1314 }
1315 }
1316
1317 #ifndef WCONTINUED
1318 # define WCONTINUED 0
1319 #endif
1320
1321 /* called on sigchld etc., calls waitpid */
1322 static void
1323 childcb (EV_P_ ev_signal *sw, int revents)
1324 {
1325 int pid, status;
1326
1327 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
1328 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
1329 if (!WCONTINUED
1330 || errno != EINVAL
1331 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
1332 return;
1333
1334 /* make sure we are called again until all children have been reaped */
1335 /* we need to do it this way so that the callback gets called before we continue */
1336 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
1337
1338 child_reap (EV_A_ pid, pid, status);
1339 if (EV_PID_HASHSIZE > 1)
1340 child_reap (EV_A_ 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
1341 }
1342
1343 #endif
1344
1345 /*****************************************************************************/
1346
1347 #if EV_USE_PORT
1348 # include "ev_port.c"
1349 #endif
1350 #if EV_USE_KQUEUE
1351 # include "ev_kqueue.c"
1352 #endif
1353 #if EV_USE_EPOLL
1354 # include "ev_epoll.c"
1355 #endif
1356 #if EV_USE_POLL
1357 # include "ev_poll.c"
1358 #endif
1359 #if EV_USE_SELECT
1360 # include "ev_select.c"
1361 #endif
1362
1363 int
1364 ev_version_major (void)
1365 {
1366 return EV_VERSION_MAJOR;
1367 }
1368
1369 int
1370 ev_version_minor (void)
1371 {
1372 return EV_VERSION_MINOR;
1373 }
1374
1375 /* return true if we are running with elevated privileges and should ignore env variables */
1376 int inline_size
1377 enable_secure (void)
1378 {
1379 #ifdef _WIN32
1380 return 0;
1381 #else
1382 return getuid () != geteuid ()
1383 || getgid () != getegid ();
1384 #endif
1385 }
1386
1387 unsigned int
1388 ev_supported_backends (void)
1389 {
1390 unsigned int flags = 0;
1391
1392 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
1393 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
1394 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
1395 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
1396 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
1397
1398 return flags;
1399 }
1400
1401 unsigned int
1402 ev_recommended_backends (void)
1403 {
1404 unsigned int flags = ev_supported_backends ();
1405
1406 #ifndef __NetBSD__
1407 /* kqueue is borked on everything but netbsd apparently */
1408 /* it usually doesn't work correctly on anything but sockets and pipes */
1409 flags &= ~EVBACKEND_KQUEUE;
1410 #endif
1411 #ifdef __APPLE__
1412 /* only select works correctly on that "unix-certified" platform */
1413 flags &= ~EVBACKEND_KQUEUE; /* horribly broken, even for sockets */
1414 flags &= ~EVBACKEND_POLL; /* poll is based on kqueue from 10.5 onwards */
1415 #endif
1416
1417 return flags;
1418 }
1419
1420 unsigned int
1421 ev_embeddable_backends (void)
1422 {
1423 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
1424
1425 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
1426 /* please fix it and tell me how to detect the fix */
1427 flags &= ~EVBACKEND_EPOLL;
1428
1429 return flags;
1430 }
1431
1432 unsigned int
1433 ev_backend (EV_P)
1434 {
1435 return backend;
1436 }
1437
1438 #if EV_MINIMAL < 2
1439 unsigned int
1440 ev_loop_count (EV_P)
1441 {
1442 return loop_count;
1443 }
1444
1445 unsigned int
1446 ev_loop_depth (EV_P)
1447 {
1448 return loop_depth;
1449 }
1450
1451 void
1452 ev_set_io_collect_interval (EV_P_ ev_tstamp interval)
1453 {
1454 io_blocktime = interval;
1455 }
1456
1457 void
1458 ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval)
1459 {
1460 timeout_blocktime = interval;
1461 }
1462
1463 void
1464 ev_set_userdata (EV_P_ void *data)
1465 {
1466 userdata = data;
1467 }
1468
1469 void *
1470 ev_userdata (EV_P)
1471 {
1472 return userdata;
1473 }
1474
1475 void ev_set_invoke_pending_cb (EV_P_ void (*invoke_pending_cb)(EV_P))
1476 {
1477 invoke_cb = invoke_pending_cb;
1478 }
1479
1480 void ev_set_loop_release_cb (EV_P_ void (*release)(EV_P), void (*acquire)(EV_P))
1481 {
1482 release_cb = release;
1483 acquire_cb = acquire;
1484 }
1485 #endif
1486
1487 /* initialise a loop structure, must be zero-initialised */
1488 static void noinline
1489 loop_init (EV_P_ unsigned int flags)
1490 {
1491 if (!backend)
1492 {
1493 #if EV_USE_REALTIME
1494 if (!have_realtime)
1495 {
1496 struct timespec ts;
1497
1498 if (!clock_gettime (CLOCK_REALTIME, &ts))
1499 have_realtime = 1;
1500 }
1501 #endif
1502
1503 #if EV_USE_MONOTONIC
1504 if (!have_monotonic)
1505 {
1506 struct timespec ts;
1507
1508 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
1509 have_monotonic = 1;
1510 }
1511 #endif
1512
1513 ev_rt_now = ev_time ();
1514 mn_now = get_clock ();
1515 now_floor = mn_now;
1516 rtmn_diff = ev_rt_now - mn_now;
1517 #if EV_MINIMAL < 2
1518 invoke_cb = ev_invoke_pending;
1519 #endif
1520
1521 io_blocktime = 0.;
1522 timeout_blocktime = 0.;
1523 backend = 0;
1524 backend_fd = -1;
1525 gotasync = 0;
1526 #if EV_USE_INOTIFY
1527 fs_fd = -2;
1528 #endif
1529 #if EV_USE_SIGNALFD
1530 sigfd = -2;
1531 #endif
1532
1533 /* pid check not overridable via env */
1534 #ifndef _WIN32
1535 if (flags & EVFLAG_FORKCHECK)
1536 curpid = getpid ();
1537 #endif
1538
1539 if (!(flags & EVFLAG_NOENV)
1540 && !enable_secure ()
1541 && getenv ("LIBEV_FLAGS"))
1542 flags = atoi (getenv ("LIBEV_FLAGS"));
1543
1544 if (!(flags & 0x0000ffffU))
1545 flags |= ev_recommended_backends ();
1546
1547 #if EV_USE_PORT
1548 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
1549 #endif
1550 #if EV_USE_KQUEUE
1551 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
1552 #endif
1553 #if EV_USE_EPOLL
1554 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
1555 #endif
1556 #if EV_USE_POLL
1557 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
1558 #endif
1559 #if EV_USE_SELECT
1560 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
1561 #endif
1562
1563 ev_prepare_init (&pending_w, pendingcb);
1564
1565 ev_init (&pipe_w, pipecb);
1566 ev_set_priority (&pipe_w, EV_MAXPRI);
1567 }
1568 }
1569
1570 /* free up a loop structure */
1571 static void noinline
1572 loop_destroy (EV_P)
1573 {
1574 int i;
1575
1576 if (ev_is_active (&pipe_w))
1577 {
1578 /*ev_ref (EV_A);*/
1579 /*ev_io_stop (EV_A_ &pipe_w);*/
1580
1581 #if EV_USE_EVENTFD
1582 if (evfd >= 0)
1583 close (evfd);
1584 #endif
1585
1586 if (evpipe [0] >= 0)
1587 {
1588 close (evpipe [0]);
1589 close (evpipe [1]);
1590 }
1591 }
1592
1593 #if EV_USE_SIGNALFD
1594 if (ev_is_active (&sigfd_w))
1595 {
1596 /*ev_ref (EV_A);*/
1597 /*ev_io_stop (EV_A_ &sigfd_w);*/
1598
1599 close (sigfd);
1600 }
1601 #endif
1602
1603 #if EV_USE_INOTIFY
1604 if (fs_fd >= 0)
1605 close (fs_fd);
1606 #endif
1607
1608 if (backend_fd >= 0)
1609 close (backend_fd);
1610
1611 #if EV_USE_PORT
1612 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
1613 #endif
1614 #if EV_USE_KQUEUE
1615 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
1616 #endif
1617 #if EV_USE_EPOLL
1618 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
1619 #endif
1620 #if EV_USE_POLL
1621 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
1622 #endif
1623 #if EV_USE_SELECT
1624 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
1625 #endif
1626
1627 for (i = NUMPRI; i--; )
1628 {
1629 array_free (pending, [i]);
1630 #if EV_IDLE_ENABLE
1631 array_free (idle, [i]);
1632 #endif
1633 }
1634
1635 ev_free (anfds); anfdmax = 0;
1636
1637 /* have to use the microsoft-never-gets-it-right macro */
1638 array_free (rfeed, EMPTY);
1639 array_free (fdchange, EMPTY);
1640 array_free (timer, EMPTY);
1641 #if EV_PERIODIC_ENABLE
1642 array_free (periodic, EMPTY);
1643 #endif
1644 #if EV_FORK_ENABLE
1645 array_free (fork, EMPTY);
1646 #endif
1647 array_free (prepare, EMPTY);
1648 array_free (check, EMPTY);
1649 #if EV_ASYNC_ENABLE
1650 array_free (async, EMPTY);
1651 #endif
1652
1653 backend = 0;
1654 }
1655
1656 #if EV_USE_INOTIFY
1657 inline_size void infy_fork (EV_P);
1658 #endif
1659
1660 inline_size void
1661 loop_fork (EV_P)
1662 {
1663 #if EV_USE_PORT
1664 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
1665 #endif
1666 #if EV_USE_KQUEUE
1667 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
1668 #endif
1669 #if EV_USE_EPOLL
1670 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
1671 #endif
1672 #if EV_USE_INOTIFY
1673 infy_fork (EV_A);
1674 #endif
1675
1676 if (ev_is_active (&pipe_w))
1677 {
1678 /* this "locks" the handlers against writing to the pipe */
1679 /* while we modify the fd vars */
1680 gotsig = 1;
1681 #if EV_ASYNC_ENABLE
1682 gotasync = 1;
1683 #endif
1684
1685 ev_ref (EV_A);
1686 ev_io_stop (EV_A_ &pipe_w);
1687
1688 #if EV_USE_EVENTFD
1689 if (evfd >= 0)
1690 close (evfd);
1691 #endif
1692
1693 if (evpipe [0] >= 0)
1694 {
1695 close (evpipe [0]);
1696 close (evpipe [1]);
1697 }
1698
1699 evpipe_init (EV_A);
1700 /* now iterate over everything, in case we missed something */
1701 pipecb (EV_A_ &pipe_w, EV_READ);
1702 }
1703
1704 postfork = 0;
1705 }
1706
1707 #if EV_MULTIPLICITY
1708
1709 struct ev_loop *
1710 ev_loop_new (unsigned int flags)
1711 {
1712 struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
1713
1714 memset (loop, 0, sizeof (struct ev_loop));
1715 loop_init (EV_A_ flags);
1716
1717 if (ev_backend (EV_A))
1718 return loop;
1719
1720 return 0;
1721 }
1722
1723 void
1724 ev_loop_destroy (EV_P)
1725 {
1726 loop_destroy (EV_A);
1727 ev_free (loop);
1728 }
1729
1730 void
1731 ev_loop_fork (EV_P)
1732 {
1733 postfork = 1; /* must be in line with ev_default_fork */
1734 }
1735 #endif /* multiplicity */
1736
1737 #if EV_VERIFY
1738 static void noinline
1739 verify_watcher (EV_P_ W w)
1740 {
1741 assert (("libev: watcher has invalid priority", ABSPRI (w) >= 0 && ABSPRI (w) < NUMPRI));
1742
1743 if (w->pending)
1744 assert (("libev: pending watcher not on pending queue", pendings [ABSPRI (w)][w->pending - 1].w == w));
1745 }
1746
1747 static void noinline
1748 verify_heap (EV_P_ ANHE *heap, int N)
1749 {
1750 int i;
1751
1752 for (i = HEAP0; i < N + HEAP0; ++i)
1753 {
1754 assert (("libev: active index mismatch in heap", ev_active (ANHE_w (heap [i])) == i));
1755 assert (("libev: heap condition violated", i == HEAP0 || ANHE_at (heap [HPARENT (i)]) <= ANHE_at (heap [i])));
1756 assert (("libev: heap at cache mismatch", ANHE_at (heap [i]) == ev_at (ANHE_w (heap [i]))));
1757
1758 verify_watcher (EV_A_ (W)ANHE_w (heap [i]));
1759 }
1760 }
1761
1762 static void noinline
1763 array_verify (EV_P_ W *ws, int cnt)
1764 {
1765 while (cnt--)
1766 {
1767 assert (("libev: active index mismatch", ev_active (ws [cnt]) == cnt + 1));
1768 verify_watcher (EV_A_ ws [cnt]);
1769 }
1770 }
1771 #endif
1772
1773 #if EV_MINIMAL < 2
1774 void
1775 ev_loop_verify (EV_P)
1776 {
1777 #if EV_VERIFY
1778 int i;
1779 WL w;
1780
1781 assert (activecnt >= -1);
1782
1783 assert (fdchangemax >= fdchangecnt);
1784 for (i = 0; i < fdchangecnt; ++i)
1785 assert (("libev: negative fd in fdchanges", fdchanges [i] >= 0));
1786
1787 assert (anfdmax >= 0);
1788 for (i = 0; i < anfdmax; ++i)
1789 for (w = anfds [i].head; w; w = w->next)
1790 {
1791 verify_watcher (EV_A_ (W)w);
1792 assert (("libev: inactive fd watcher on anfd list", ev_active (w) == 1));
1793 assert (("libev: fd mismatch between watcher and anfd", ((ev_io *)w)->fd == i));
1794 }
1795
1796 assert (timermax >= timercnt);
1797 verify_heap (EV_A_ timers, timercnt);
1798
1799 #if EV_PERIODIC_ENABLE
1800 assert (periodicmax >= periodiccnt);
1801 verify_heap (EV_A_ periodics, periodiccnt);
1802 #endif
1803
1804 for (i = NUMPRI; i--; )
1805 {
1806 assert (pendingmax [i] >= pendingcnt [i]);
1807 #if EV_IDLE_ENABLE
1808 assert (idleall >= 0);
1809 assert (idlemax [i] >= idlecnt [i]);
1810 array_verify (EV_A_ (W *)idles [i], idlecnt [i]);
1811 #endif
1812 }
1813
1814 #if EV_FORK_ENABLE
1815 assert (forkmax >= forkcnt);
1816 array_verify (EV_A_ (W *)forks, forkcnt);
1817 #endif
1818
1819 #if EV_ASYNC_ENABLE
1820 assert (asyncmax >= asynccnt);
1821 array_verify (EV_A_ (W *)asyncs, asynccnt);
1822 #endif
1823
1824 assert (preparemax >= preparecnt);
1825 array_verify (EV_A_ (W *)prepares, preparecnt);
1826
1827 assert (checkmax >= checkcnt);
1828 array_verify (EV_A_ (W *)checks, checkcnt);
1829
1830 # if 0
1831 for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
1832 for (signum = signalmax; signum--; ) if (signals [signum].gotsig)
1833 # endif
1834 #endif
1835 }
1836 #endif
1837
1838 #if EV_MULTIPLICITY
1839 struct ev_loop *
1840 ev_default_loop_init (unsigned int flags)
1841 #else
1842 int
1843 ev_default_loop (unsigned int flags)
1844 #endif
1845 {
1846 if (!ev_default_loop_ptr)
1847 {
1848 #if EV_MULTIPLICITY
1849 struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
1850 #else
1851 ev_default_loop_ptr = 1;
1852 #endif
1853
1854 loop_init (EV_A_ flags);
1855
1856 if (ev_backend (EV_A))
1857 {
1858 #ifndef _WIN32
1859 ev_signal_init (&childev, childcb, SIGCHLD);
1860 ev_set_priority (&childev, EV_MAXPRI);
1861 ev_signal_start (EV_A_ &childev);
1862 ev_unref (EV_A); /* child watcher should not keep loop alive */
1863 #endif
1864 }
1865 else
1866 ev_default_loop_ptr = 0;
1867 }
1868
1869 return ev_default_loop_ptr;
1870 }
1871
1872 void
1873 ev_default_destroy (void)
1874 {
1875 #if EV_MULTIPLICITY
1876 struct ev_loop *loop = ev_default_loop_ptr;
1877 #endif
1878
1879 ev_default_loop_ptr = 0;
1880
1881 #ifndef _WIN32
1882 ev_ref (EV_A); /* child watcher */
1883 ev_signal_stop (EV_A_ &childev);
1884 #endif
1885
1886 loop_destroy (EV_A);
1887 }
1888
1889 void
1890 ev_default_fork (void)
1891 {
1892 #if EV_MULTIPLICITY
1893 struct ev_loop *loop = ev_default_loop_ptr;
1894 #endif
1895
1896 postfork = 1; /* must be in line with ev_loop_fork */
1897 }
1898
1899 /*****************************************************************************/
1900
1901 void
1902 ev_invoke (EV_P_ void *w, int revents)
1903 {
1904 EV_CB_INVOKE ((W)w, revents);
1905 }
1906
1907 unsigned int
1908 ev_pending_count (EV_P)
1909 {
1910 int pri;
1911 unsigned int count = 0;
1912
1913 for (pri = NUMPRI; pri--; )
1914 count += pendingcnt [pri];
1915
1916 return count;
1917 }
1918
1919 void noinline
1920 ev_invoke_pending (EV_P)
1921 {
1922 int pri;
1923
1924 for (pri = NUMPRI; pri--; )
1925 while (pendingcnt [pri])
1926 {
1927 ANPENDING *p = pendings [pri] + --pendingcnt [pri];
1928
1929 /*assert (("libev: non-pending watcher on pending list", p->w->pending));*/
1930 /* ^ this is no longer true, as pending_w could be here */
1931
1932 p->w->pending = 0;
1933 EV_CB_INVOKE (p->w, p->events);
1934 EV_FREQUENT_CHECK;
1935 }
1936 }
1937
1938 #if EV_IDLE_ENABLE
1939 /* make idle watchers pending. this handles the "call-idle */
1940 /* only when higher priorities are idle" logic */
1941 inline_size void
1942 idle_reify (EV_P)
1943 {
1944 if (expect_false (idleall))
1945 {
1946 int pri;
1947
1948 for (pri = NUMPRI; pri--; )
1949 {
1950 if (pendingcnt [pri])
1951 break;
1952
1953 if (idlecnt [pri])
1954 {
1955 queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
1956 break;
1957 }
1958 }
1959 }
1960 }
1961 #endif
1962
1963 /* make timers pending */
1964 inline_size void
1965 timers_reify (EV_P)
1966 {
1967 EV_FREQUENT_CHECK;
1968
1969 if (timercnt && ANHE_at (timers [HEAP0]) < mn_now)
1970 {
1971 do
1972 {
1973 ev_timer *w = (ev_timer *)ANHE_w (timers [HEAP0]);
1974
1975 /*assert (("libev: inactive timer on timer heap detected", ev_is_active (w)));*/
1976
1977 /* first reschedule or stop timer */
1978 if (w->repeat)
1979 {
1980 ev_at (w) += w->repeat;
1981 if (ev_at (w) < mn_now)
1982 ev_at (w) = mn_now;
1983
1984 assert (("libev: negative ev_timer repeat value found while processing timers", w->repeat > 0.));
1985
1986 ANHE_at_cache (timers [HEAP0]);
1987 downheap (timers, timercnt, HEAP0);
1988 }
1989 else
1990 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
1991
1992 EV_FREQUENT_CHECK;
1993 feed_reverse (EV_A_ (W)w);
1994 }
1995 while (timercnt && ANHE_at (timers [HEAP0]) < mn_now);
1996
1997 feed_reverse_done (EV_A_ EV_TIMEOUT);
1998 }
1999 }
2000
2001 #if EV_PERIODIC_ENABLE
2002 /* make periodics pending */
2003 inline_size void
2004 periodics_reify (EV_P)
2005 {
2006 EV_FREQUENT_CHECK;
2007
2008 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now)
2009 {
2010 int feed_count = 0;
2011
2012 do
2013 {
2014 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [HEAP0]);
2015
2016 /*assert (("libev: inactive timer on periodic heap detected", ev_is_active (w)));*/
2017
2018 /* first reschedule or stop timer */
2019 if (w->reschedule_cb)
2020 {
2021 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2022
2023 assert (("libev: ev_periodic reschedule callback returned time in the past", ev_at (w) >= ev_rt_now));
2024
2025 ANHE_at_cache (periodics [HEAP0]);
2026 downheap (periodics, periodiccnt, HEAP0);
2027 }
2028 else if (w->interval)
2029 {
2030 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
2031 /* if next trigger time is not sufficiently in the future, put it there */
2032 /* this might happen because of floating point inexactness */
2033 if (ev_at (w) - ev_rt_now < TIME_EPSILON)
2034 {
2035 ev_at (w) += w->interval;
2036
2037 /* if interval is unreasonably low we might still have a time in the past */
2038 /* so correct this. this will make the periodic very inexact, but the user */
2039 /* has effectively asked to get triggered more often than possible */
2040 if (ev_at (w) < ev_rt_now)
2041 ev_at (w) = ev_rt_now;
2042 }
2043
2044 ANHE_at_cache (periodics [HEAP0]);
2045 downheap (periodics, periodiccnt, HEAP0);
2046 }
2047 else
2048 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
2049
2050 EV_FREQUENT_CHECK;
2051 feed_reverse (EV_A_ (W)w);
2052 }
2053 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now);
2054
2055 feed_reverse_done (EV_A_ EV_PERIODIC);
2056 }
2057 }
2058
2059 /* simply recalculate all periodics */
2060 /* TODO: maybe ensure that at leats one event happens when jumping forward? */
2061 static void noinline
2062 periodics_reschedule (EV_P)
2063 {
2064 int i;
2065
2066 /* adjust periodics after time jump */
2067 for (i = HEAP0; i < periodiccnt + HEAP0; ++i)
2068 {
2069 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [i]);
2070
2071 if (w->reschedule_cb)
2072 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2073 else if (w->interval)
2074 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
2075
2076 ANHE_at_cache (periodics [i]);
2077 }
2078
2079 reheap (periodics, periodiccnt);
2080 }
2081 #endif
2082
2083 /* adjust all timers by a given offset */
2084 static void noinline
2085 timers_reschedule (EV_P_ ev_tstamp adjust)
2086 {
2087 int i;
2088
2089 for (i = 0; i < timercnt; ++i)
2090 {
2091 ANHE *he = timers + i + HEAP0;
2092 ANHE_w (*he)->at += adjust;
2093 ANHE_at_cache (*he);
2094 }
2095 }
2096
2097 /* fetch new monotonic and realtime times from the kernel */
2098 /* also detetc if there was a timejump, and act accordingly */
2099 inline_speed void
2100 time_update (EV_P_ ev_tstamp max_block)
2101 {
2102 #if EV_USE_MONOTONIC
2103 if (expect_true (have_monotonic))
2104 {
2105 int i;
2106 ev_tstamp odiff = rtmn_diff;
2107
2108 mn_now = get_clock ();
2109
2110 /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
2111 /* interpolate in the meantime */
2112 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
2113 {
2114 ev_rt_now = rtmn_diff + mn_now;
2115 return;
2116 }
2117
2118 now_floor = mn_now;
2119 ev_rt_now = ev_time ();
2120
2121 /* loop a few times, before making important decisions.
2122 * on the choice of "4": one iteration isn't enough,
2123 * in case we get preempted during the calls to
2124 * ev_time and get_clock. a second call is almost guaranteed
2125 * to succeed in that case, though. and looping a few more times
2126 * doesn't hurt either as we only do this on time-jumps or
2127 * in the unlikely event of having been preempted here.
2128 */
2129 for (i = 4; --i; )
2130 {
2131 rtmn_diff = ev_rt_now - mn_now;
2132
2133 if (expect_true (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP))
2134 return; /* all is well */
2135
2136 ev_rt_now = ev_time ();
2137 mn_now = get_clock ();
2138 now_floor = mn_now;
2139 }
2140
2141 /* no timer adjustment, as the monotonic clock doesn't jump */
2142 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
2143 # if EV_PERIODIC_ENABLE
2144 periodics_reschedule (EV_A);
2145 # endif
2146 }
2147 else
2148 #endif
2149 {
2150 ev_rt_now = ev_time ();
2151
2152 if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
2153 {
2154 /* adjust timers. this is easy, as the offset is the same for all of them */
2155 timers_reschedule (EV_A_ ev_rt_now - mn_now);
2156 #if EV_PERIODIC_ENABLE
2157 periodics_reschedule (EV_A);
2158 #endif
2159 }
2160
2161 mn_now = ev_rt_now;
2162 }
2163 }
2164
2165 void
2166 ev_loop (EV_P_ int flags)
2167 {
2168 #if EV_MINIMAL < 2
2169 ++loop_depth;
2170 #endif
2171
2172 assert (("libev: ev_loop recursion during release detected", loop_done != EVUNLOOP_RECURSE));
2173
2174 loop_done = EVUNLOOP_CANCEL;
2175
2176 EV_INVOKE_PENDING; /* in case we recurse, ensure ordering stays nice and clean */
2177
2178 do
2179 {
2180 #if EV_VERIFY >= 2
2181 ev_loop_verify (EV_A);
2182 #endif
2183
2184 #ifndef _WIN32
2185 if (expect_false (curpid)) /* penalise the forking check even more */
2186 if (expect_false (getpid () != curpid))
2187 {
2188 curpid = getpid ();
2189 postfork = 1;
2190 }
2191 #endif
2192
2193 #if EV_FORK_ENABLE
2194 /* we might have forked, so queue fork handlers */
2195 if (expect_false (postfork))
2196 if (forkcnt)
2197 {
2198 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
2199 EV_INVOKE_PENDING;
2200 }
2201 #endif
2202
2203 /* queue prepare watchers (and execute them) */
2204 if (expect_false (preparecnt))
2205 {
2206 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
2207 EV_INVOKE_PENDING;
2208 }
2209
2210 if (expect_false (loop_done))
2211 break;
2212
2213 /* we might have forked, so reify kernel state if necessary */
2214 if (expect_false (postfork))
2215 loop_fork (EV_A);
2216
2217 /* update fd-related kernel structures */
2218 fd_reify (EV_A);
2219
2220 /* calculate blocking time */
2221 {
2222 ev_tstamp waittime = 0.;
2223 ev_tstamp sleeptime = 0.;
2224
2225 if (expect_true (!(flags & EVLOOP_NONBLOCK || idleall || !activecnt)))
2226 {
2227 /* remember old timestamp for io_blocktime calculation */
2228 ev_tstamp prev_mn_now = mn_now;
2229
2230 /* update time to cancel out callback processing overhead */
2231 time_update (EV_A_ 1e100);
2232
2233 waittime = MAX_BLOCKTIME;
2234
2235 if (timercnt)
2236 {
2237 ev_tstamp to = ANHE_at (timers [HEAP0]) - mn_now + backend_fudge;
2238 if (waittime > to) waittime = to;
2239 }
2240
2241 #if EV_PERIODIC_ENABLE
2242 if (periodiccnt)
2243 {
2244 ev_tstamp to = ANHE_at (periodics [HEAP0]) - ev_rt_now + backend_fudge;
2245 if (waittime > to) waittime = to;
2246 }
2247 #endif
2248
2249 /* don't let timeouts decrease the waittime below timeout_blocktime */
2250 if (expect_false (waittime < timeout_blocktime))
2251 waittime = timeout_blocktime;
2252
2253 /* extra check because io_blocktime is commonly 0 */
2254 if (expect_false (io_blocktime))
2255 {
2256 sleeptime = io_blocktime - (mn_now - prev_mn_now);
2257
2258 if (sleeptime > waittime - backend_fudge)
2259 sleeptime = waittime - backend_fudge;
2260
2261 if (expect_true (sleeptime > 0.))
2262 {
2263 ev_sleep (sleeptime);
2264 waittime -= sleeptime;
2265 }
2266 }
2267 }
2268
2269 #if EV_MINIMAL < 2
2270 ++loop_count;
2271 #endif
2272 assert ((loop_done = EVUNLOOP_RECURSE, 1)); /* assert for side effect */
2273 backend_poll (EV_A_ waittime);
2274 assert ((loop_done = EVUNLOOP_CANCEL, 1)); /* assert for side effect */
2275
2276 /* update ev_rt_now, do magic */
2277 time_update (EV_A_ waittime + sleeptime);
2278 }
2279
2280 /* queue pending timers and reschedule them */
2281 timers_reify (EV_A); /* relative timers called last */
2282 #if EV_PERIODIC_ENABLE
2283 periodics_reify (EV_A); /* absolute timers called first */
2284 #endif
2285
2286 #if EV_IDLE_ENABLE
2287 /* queue idle watchers unless other events are pending */
2288 idle_reify (EV_A);
2289 #endif
2290
2291 /* queue check watchers, to be executed first */
2292 if (expect_false (checkcnt))
2293 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
2294
2295 EV_INVOKE_PENDING;
2296 }
2297 while (expect_true (
2298 activecnt
2299 && !loop_done
2300 && !(flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK))
2301 ));
2302
2303 if (loop_done == EVUNLOOP_ONE)
2304 loop_done = EVUNLOOP_CANCEL;
2305
2306 #if EV_MINIMAL < 2
2307 --loop_depth;
2308 #endif
2309 }
2310
2311 void
2312 ev_unloop (EV_P_ int how)
2313 {
2314 loop_done = how;
2315 }
2316
2317 void
2318 ev_ref (EV_P)
2319 {
2320 ++activecnt;
2321 }
2322
2323 void
2324 ev_unref (EV_P)
2325 {
2326 --activecnt;
2327 }
2328
2329 void
2330 ev_now_update (EV_P)
2331 {
2332 time_update (EV_A_ 1e100);
2333 }
2334
2335 void
2336 ev_suspend (EV_P)
2337 {
2338 ev_now_update (EV_A);
2339 }
2340
2341 void
2342 ev_resume (EV_P)
2343 {
2344 ev_tstamp mn_prev = mn_now;
2345
2346 ev_now_update (EV_A);
2347 timers_reschedule (EV_A_ mn_now - mn_prev);
2348 #if EV_PERIODIC_ENABLE
2349 /* TODO: really do this? */
2350 periodics_reschedule (EV_A);
2351 #endif
2352 }
2353
2354 /*****************************************************************************/
2355 /* singly-linked list management, used when the expected list length is short */
2356
2357 inline_size void
2358 wlist_add (WL *head, WL elem)
2359 {
2360 elem->next = *head;
2361 *head = elem;
2362 }
2363
2364 inline_size void
2365 wlist_del (WL *head, WL elem)
2366 {
2367 while (*head)
2368 {
2369 if (*head == elem)
2370 {
2371 *head = elem->next;
2372 return;
2373 }
2374
2375 head = &(*head)->next;
2376 }
2377 }
2378
2379 /* internal, faster, version of ev_clear_pending */
2380 inline_speed void
2381 clear_pending (EV_P_ W w)
2382 {
2383 if (w->pending)
2384 {
2385 pendings [ABSPRI (w)][w->pending - 1].w = (W)&pending_w;
2386 w->pending = 0;
2387 }
2388 }
2389
2390 int
2391 ev_clear_pending (EV_P_ void *w)
2392 {
2393 W w_ = (W)w;
2394 int pending = w_->pending;
2395
2396 if (expect_true (pending))
2397 {
2398 ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
2399 p->w = (W)&pending_w;
2400 w_->pending = 0;
2401 return p->events;
2402 }
2403 else
2404 return 0;
2405 }
2406
2407 inline_size void
2408 pri_adjust (EV_P_ W w)
2409 {
2410 int pri = ev_priority (w);
2411 pri = pri < EV_MINPRI ? EV_MINPRI : pri;
2412 pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
2413 ev_set_priority (w, pri);
2414 }
2415
2416 inline_speed void
2417 ev_start (EV_P_ W w, int active)
2418 {
2419 pri_adjust (EV_A_ w);
2420 w->active = active;
2421 ev_ref (EV_A);
2422 }
2423
2424 inline_size void
2425 ev_stop (EV_P_ W w)
2426 {
2427 ev_unref (EV_A);
2428 w->active = 0;
2429 }
2430
2431 /*****************************************************************************/
2432
2433 void noinline
2434 ev_io_start (EV_P_ ev_io *w)
2435 {
2436 int fd = w->fd;
2437
2438 if (expect_false (ev_is_active (w)))
2439 return;
2440
2441 assert (("libev: ev_io_start called with negative fd", fd >= 0));
2442 assert (("libev: ev_io start called with illegal event mask", !(w->events & ~(EV__IOFDSET | EV_READ | EV_WRITE))));
2443
2444 EV_FREQUENT_CHECK;
2445
2446 ev_start (EV_A_ (W)w, 1);
2447 array_needsize (ANFD, anfds, anfdmax, fd + 1, array_init_zero);
2448 wlist_add (&anfds[fd].head, (WL)w);
2449
2450 fd_change (EV_A_ fd, w->events & EV__IOFDSET | EV_ANFD_REIFY);
2451 w->events &= ~EV__IOFDSET;
2452
2453 EV_FREQUENT_CHECK;
2454 }
2455
2456 void noinline
2457 ev_io_stop (EV_P_ ev_io *w)
2458 {
2459 clear_pending (EV_A_ (W)w);
2460 if (expect_false (!ev_is_active (w)))
2461 return;
2462
2463 assert (("libev: ev_io_stop called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
2464
2465 EV_FREQUENT_CHECK;
2466
2467 wlist_del (&anfds[w->fd].head, (WL)w);
2468 ev_stop (EV_A_ (W)w);
2469
2470 fd_change (EV_A_ w->fd, 1);
2471
2472 EV_FREQUENT_CHECK;
2473 }
2474
2475 void noinline
2476 ev_timer_start (EV_P_ ev_timer *w)
2477 {
2478 if (expect_false (ev_is_active (w)))
2479 return;
2480
2481 ev_at (w) += mn_now;
2482
2483 assert (("libev: ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
2484
2485 EV_FREQUENT_CHECK;
2486
2487 ++timercnt;
2488 ev_start (EV_A_ (W)w, timercnt + HEAP0 - 1);
2489 array_needsize (ANHE, timers, timermax, ev_active (w) + 1, EMPTY2);
2490 ANHE_w (timers [ev_active (w)]) = (WT)w;
2491 ANHE_at_cache (timers [ev_active (w)]);
2492 upheap (timers, ev_active (w));
2493
2494 EV_FREQUENT_CHECK;
2495
2496 /*assert (("libev: internal timer heap corruption", timers [ev_active (w)] == (WT)w));*/
2497 }
2498
2499 void noinline
2500 ev_timer_stop (EV_P_ ev_timer *w)
2501 {
2502 clear_pending (EV_A_ (W)w);
2503 if (expect_false (!ev_is_active (w)))
2504 return;
2505
2506 EV_FREQUENT_CHECK;
2507
2508 {
2509 int active = ev_active (w);
2510
2511 assert (("libev: internal timer heap corruption", ANHE_w (timers [active]) == (WT)w));
2512
2513 --timercnt;
2514
2515 if (expect_true (active < timercnt + HEAP0))
2516 {
2517 timers [active] = timers [timercnt + HEAP0];
2518 adjustheap (timers, timercnt, active);
2519 }
2520 }
2521
2522 EV_FREQUENT_CHECK;
2523
2524 ev_at (w) -= mn_now;
2525
2526 ev_stop (EV_A_ (W)w);
2527 }
2528
2529 void noinline
2530 ev_timer_again (EV_P_ ev_timer *w)
2531 {
2532 EV_FREQUENT_CHECK;
2533
2534 if (ev_is_active (w))
2535 {
2536 if (w->repeat)
2537 {
2538 ev_at (w) = mn_now + w->repeat;
2539 ANHE_at_cache (timers [ev_active (w)]);
2540 adjustheap (timers, timercnt, ev_active (w));
2541 }
2542 else
2543 ev_timer_stop (EV_A_ w);
2544 }
2545 else if (w->repeat)
2546 {
2547 ev_at (w) = w->repeat;
2548 ev_timer_start (EV_A_ w);
2549 }
2550
2551 EV_FREQUENT_CHECK;
2552 }
2553
2554 ev_tstamp
2555 ev_timer_remaining (EV_P_ ev_timer *w)
2556 {
2557 return ev_at (w) - (ev_is_active (w) ? mn_now : 0.);
2558 }
2559
2560 #if EV_PERIODIC_ENABLE
2561 void noinline
2562 ev_periodic_start (EV_P_ ev_periodic *w)
2563 {
2564 if (expect_false (ev_is_active (w)))
2565 return;
2566
2567 if (w->reschedule_cb)
2568 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2569 else if (w->interval)
2570 {
2571 assert (("libev: ev_periodic_start called with negative interval value", w->interval >= 0.));
2572 /* this formula differs from the one in periodic_reify because we do not always round up */
2573 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
2574 }
2575 else
2576 ev_at (w) = w->offset;
2577
2578 EV_FREQUENT_CHECK;
2579
2580 ++periodiccnt;
2581 ev_start (EV_A_ (W)w, periodiccnt + HEAP0 - 1);
2582 array_needsize (ANHE, periodics, periodicmax, ev_active (w) + 1, EMPTY2);
2583 ANHE_w (periodics [ev_active (w)]) = (WT)w;
2584 ANHE_at_cache (periodics [ev_active (w)]);
2585 upheap (periodics, ev_active (w));
2586
2587 EV_FREQUENT_CHECK;
2588
2589 /*assert (("libev: internal periodic heap corruption", ANHE_w (periodics [ev_active (w)]) == (WT)w));*/
2590 }
2591
2592 void noinline
2593 ev_periodic_stop (EV_P_ ev_periodic *w)
2594 {
2595 clear_pending (EV_A_ (W)w);
2596 if (expect_false (!ev_is_active (w)))
2597 return;
2598
2599 EV_FREQUENT_CHECK;
2600
2601 {
2602 int active = ev_active (w);
2603
2604 assert (("libev: internal periodic heap corruption", ANHE_w (periodics [active]) == (WT)w));
2605
2606 --periodiccnt;
2607
2608 if (expect_true (active < periodiccnt + HEAP0))
2609 {
2610 periodics [active] = periodics [periodiccnt + HEAP0];
2611 adjustheap (periodics, periodiccnt, active);
2612 }
2613 }
2614
2615 EV_FREQUENT_CHECK;
2616
2617 ev_stop (EV_A_ (W)w);
2618 }
2619
2620 void noinline
2621 ev_periodic_again (EV_P_ ev_periodic *w)
2622 {
2623 /* TODO: use adjustheap and recalculation */
2624 ev_periodic_stop (EV_A_ w);
2625 ev_periodic_start (EV_A_ w);
2626 }
2627 #endif
2628
2629 #ifndef SA_RESTART
2630 # define SA_RESTART 0
2631 #endif
2632
2633 void noinline
2634 ev_signal_start (EV_P_ ev_signal *w)
2635 {
2636 #if EV_MULTIPLICITY
2637 assert (("libev: signal watchers are only supported in the default loop", loop == ev_default_loop_ptr));
2638 #endif
2639 if (expect_false (ev_is_active (w)))
2640 return;
2641
2642 assert (("libev: ev_signal_start called with illegal signal number", w->signum > 0));
2643
2644 EV_FREQUENT_CHECK;
2645
2646 #if EV_USE_SIGNALFD
2647 if (sigfd == -2)
2648 {
2649 sigfd = signalfd (-1, &sigfd_set, SFD_NONBLOCK | SFD_CLOEXEC);
2650 if (sigfd < 0 && errno == EINVAL)
2651 sigfd = signalfd (-1, &sigfd_set, 0); /* retry without flags */
2652
2653 if (sigfd >= 0)
2654 {
2655 fd_intern (sigfd); /* doing it twice will not hurt */
2656
2657 sigemptyset (&sigfd_set);
2658
2659 ev_io_init (&sigfd_w, sigfdcb, sigfd, EV_READ);
2660 ev_set_priority (&sigfd_w, EV_MAXPRI);
2661 ev_io_start (EV_A_ &sigfd_w);
2662 ev_unref (EV_A); /* signalfd watcher should not keep loop alive */
2663 }
2664 }
2665
2666 if (sigfd >= 0)
2667 {
2668 /* TODO: check .head */
2669 sigaddset (&sigfd_set, w->signum);
2670 sigprocmask (SIG_BLOCK, &sigfd_set, 0);
2671
2672 signalfd (sigfd, &sigfd_set, 0);
2673 }
2674 else
2675 #endif
2676 evpipe_init (EV_A);
2677
2678 {
2679 #ifndef _WIN32
2680 sigset_t full, prev;
2681 sigfillset (&full);
2682 sigprocmask (SIG_SETMASK, &full, &prev);
2683 #endif
2684
2685 array_needsize (ANSIG, signals, signalmax, w->signum, array_init_zero);
2686
2687 #ifndef _WIN32
2688 if (sigfd < 0)/*TODO*/
2689 sigdelset (&prev, w->signum);
2690 sigprocmask (SIG_SETMASK, &prev, 0);
2691 #endif
2692 }
2693
2694 ev_start (EV_A_ (W)w, 1);
2695 wlist_add (&signals [w->signum - 1].head, (WL)w);
2696
2697 if (!((WL)w)->next)
2698 {
2699 #if _WIN32
2700 signal (w->signum, ev_sighandler);
2701 #else
2702 if (sigfd < 0) /*TODO*/
2703 {
2704 struct sigaction sa = { };
2705 sa.sa_handler = ev_sighandler;
2706 sigfillset (&sa.sa_mask);
2707 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
2708 sigaction (w->signum, &sa, 0);
2709 }
2710 #endif
2711 }
2712
2713 EV_FREQUENT_CHECK;
2714 }
2715
2716 void noinline
2717 ev_signal_stop (EV_P_ ev_signal *w)
2718 {
2719 clear_pending (EV_A_ (W)w);
2720 if (expect_false (!ev_is_active (w)))
2721 return;
2722
2723 EV_FREQUENT_CHECK;
2724
2725 wlist_del (&signals [w->signum - 1].head, (WL)w);
2726 ev_stop (EV_A_ (W)w);
2727
2728 if (!signals [w->signum - 1].head)
2729 #if EV_USE_SIGNALFD
2730 if (sigfd >= 0)
2731 {
2732 sigprocmask (SIG_UNBLOCK, &sigfd_set, 0);//D
2733 sigdelset (&sigfd_set, w->signum);
2734 signalfd (sigfd, &sigfd_set, 0);
2735 sigprocmask (SIG_BLOCK, &sigfd_set, 0);//D
2736 /*TODO: maybe unblock signal? */
2737 }
2738 else
2739 #endif
2740 signal (w->signum, SIG_DFL);
2741
2742 EV_FREQUENT_CHECK;
2743 }
2744
2745 void
2746 ev_child_start (EV_P_ ev_child *w)
2747 {
2748 #if EV_MULTIPLICITY
2749 assert (("libev: child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
2750 #endif
2751 if (expect_false (ev_is_active (w)))
2752 return;
2753
2754 EV_FREQUENT_CHECK;
2755
2756 ev_start (EV_A_ (W)w, 1);
2757 wlist_add (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
2758
2759 EV_FREQUENT_CHECK;
2760 }
2761
2762 void
2763 ev_child_stop (EV_P_ ev_child *w)
2764 {
2765 clear_pending (EV_A_ (W)w);
2766 if (expect_false (!ev_is_active (w)))
2767 return;
2768
2769 EV_FREQUENT_CHECK;
2770
2771 wlist_del (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
2772 ev_stop (EV_A_ (W)w);
2773
2774 EV_FREQUENT_CHECK;
2775 }
2776
2777 #if EV_STAT_ENABLE
2778
2779 # ifdef _WIN32
2780 # undef lstat
2781 # define lstat(a,b) _stati64 (a,b)
2782 # endif
2783
2784 #define DEF_STAT_INTERVAL 5.0074891
2785 #define NFS_STAT_INTERVAL 30.1074891 /* for filesystems potentially failing inotify */
2786 #define MIN_STAT_INTERVAL 0.1074891
2787
2788 static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
2789
2790 #if EV_USE_INOTIFY
2791 # define EV_INOTIFY_BUFSIZE 8192
2792
2793 static void noinline
2794 infy_add (EV_P_ ev_stat *w)
2795 {
2796 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);
2797
2798 if (w->wd < 0)
2799 {
2800 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
2801 ev_timer_again (EV_A_ &w->timer); /* this is not race-free, so we still need to recheck periodically */
2802
2803 /* monitor some parent directory for speedup hints */
2804 /* note that exceeding the hardcoded path limit is not a correctness issue, */
2805 /* but an efficiency issue only */
2806 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
2807 {
2808 char path [4096];
2809 strcpy (path, w->path);
2810
2811 do
2812 {
2813 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
2814 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
2815
2816 char *pend = strrchr (path, '/');
2817
2818 if (!pend || pend == path)
2819 break;
2820
2821 *pend = 0;
2822 w->wd = inotify_add_watch (fs_fd, path, mask);
2823 }
2824 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
2825 }
2826 }
2827
2828 if (w->wd >= 0)
2829 {
2830 wlist_add (&fs_hash [w->wd & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
2831
2832 /* now local changes will be tracked by inotify, but remote changes won't */
2833 /* unless the filesystem it known to be local, we therefore still poll */
2834 /* also do poll on <2.6.25, but with normal frequency */
2835 struct statfs sfs;
2836
2837 if (fs_2625 && !statfs (w->path, &sfs))
2838 if (sfs.f_type == 0x1373 /* devfs */
2839 || sfs.f_type == 0xEF53 /* ext2/3 */
2840 || sfs.f_type == 0x3153464a /* jfs */
2841 || sfs.f_type == 0x52654973 /* reiser3 */
2842 || sfs.f_type == 0x01021994 /* tempfs */
2843 || sfs.f_type == 0x58465342 /* xfs */)
2844 return;
2845
2846 w->timer.repeat = w->interval ? w->interval : fs_2625 ? NFS_STAT_INTERVAL : DEF_STAT_INTERVAL;
2847 ev_timer_again (EV_A_ &w->timer);
2848 }
2849 }
2850
2851 static void noinline
2852 infy_del (EV_P_ ev_stat *w)
2853 {
2854 int slot;
2855 int wd = w->wd;
2856
2857 if (wd < 0)
2858 return;
2859
2860 w->wd = -2;
2861 slot = wd & (EV_INOTIFY_HASHSIZE - 1);
2862 wlist_del (&fs_hash [slot].head, (WL)w);
2863
2864 /* remove this watcher, if others are watching it, they will rearm */
2865 inotify_rm_watch (fs_fd, wd);
2866 }
2867
2868 static void noinline
2869 infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
2870 {
2871 if (slot < 0)
2872 /* overflow, need to check for all hash slots */
2873 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
2874 infy_wd (EV_A_ slot, wd, ev);
2875 else
2876 {
2877 WL w_;
2878
2879 for (w_ = fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head; w_; )
2880 {
2881 ev_stat *w = (ev_stat *)w_;
2882 w_ = w_->next; /* lets us remove this watcher and all before it */
2883
2884 if (w->wd == wd || wd == -1)
2885 {
2886 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
2887 {
2888 wlist_del (&fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
2889 w->wd = -1;
2890 infy_add (EV_A_ w); /* re-add, no matter what */
2891 }
2892
2893 stat_timer_cb (EV_A_ &w->timer, 0);
2894 }
2895 }
2896 }
2897 }
2898
2899 static void
2900 infy_cb (EV_P_ ev_io *w, int revents)
2901 {
2902 char buf [EV_INOTIFY_BUFSIZE];
2903 struct inotify_event *ev = (struct inotify_event *)buf;
2904 int ofs;
2905 int len = read (fs_fd, buf, sizeof (buf));
2906
2907 for (ofs = 0; ofs < len; ofs += sizeof (struct inotify_event) + ev->len)
2908 infy_wd (EV_A_ ev->wd, ev->wd, ev);
2909 }
2910
2911 inline_size void
2912 check_2625 (EV_P)
2913 {
2914 /* kernels < 2.6.25 are borked
2915 * http://www.ussg.indiana.edu/hypermail/linux/kernel/0711.3/1208.html
2916 */
2917 struct utsname buf;
2918 int major, minor, micro;
2919
2920 if (uname (&buf))
2921 return;
2922
2923 if (sscanf (buf.release, "%d.%d.%d", &major, &minor, &micro) != 3)
2924 return;
2925
2926 if (major < 2
2927 || (major == 2 && minor < 6)
2928 || (major == 2 && minor == 6 && micro < 25))
2929 return;
2930
2931 fs_2625 = 1;
2932 }
2933
2934 inline_size void
2935 infy_init (EV_P)
2936 {
2937 if (fs_fd != -2)
2938 return;
2939
2940 fs_fd = -1;
2941
2942 check_2625 (EV_A);
2943
2944 fs_fd = inotify_init ();
2945
2946 if (fs_fd >= 0)
2947 {
2948 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
2949 ev_set_priority (&fs_w, EV_MAXPRI);
2950 ev_io_start (EV_A_ &fs_w);
2951 }
2952 }
2953
2954 inline_size void
2955 infy_fork (EV_P)
2956 {
2957 int slot;
2958
2959 if (fs_fd < 0)
2960 return;
2961
2962 close (fs_fd);
2963 fs_fd = inotify_init ();
2964
2965 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
2966 {
2967 WL w_ = fs_hash [slot].head;
2968 fs_hash [slot].head = 0;
2969
2970 while (w_)
2971 {
2972 ev_stat *w = (ev_stat *)w_;
2973 w_ = w_->next; /* lets us add this watcher */
2974
2975 w->wd = -1;
2976
2977 if (fs_fd >= 0)
2978 infy_add (EV_A_ w); /* re-add, no matter what */
2979 else
2980 ev_timer_again (EV_A_ &w->timer);
2981 }
2982 }
2983 }
2984
2985 #endif
2986
2987 #ifdef _WIN32
2988 # define EV_LSTAT(p,b) _stati64 (p, b)
2989 #else
2990 # define EV_LSTAT(p,b) lstat (p, b)
2991 #endif
2992
2993 void
2994 ev_stat_stat (EV_P_ ev_stat *w)
2995 {
2996 if (lstat (w->path, &w->attr) < 0)
2997 w->attr.st_nlink = 0;
2998 else if (!w->attr.st_nlink)
2999 w->attr.st_nlink = 1;
3000 }
3001
3002 static void noinline
3003 stat_timer_cb (EV_P_ ev_timer *w_, int revents)
3004 {
3005 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
3006
3007 /* we copy this here each the time so that */
3008 /* prev has the old value when the callback gets invoked */
3009 w->prev = w->attr;
3010 ev_stat_stat (EV_A_ w);
3011
3012 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
3013 if (
3014 w->prev.st_dev != w->attr.st_dev
3015 || w->prev.st_ino != w->attr.st_ino
3016 || w->prev.st_mode != w->attr.st_mode
3017 || w->prev.st_nlink != w->attr.st_nlink
3018 || w->prev.st_uid != w->attr.st_uid
3019 || w->prev.st_gid != w->attr.st_gid
3020 || w->prev.st_rdev != w->attr.st_rdev
3021 || w->prev.st_size != w->attr.st_size
3022 || w->prev.st_atime != w->attr.st_atime
3023 || w->prev.st_mtime != w->attr.st_mtime
3024 || w->prev.st_ctime != w->attr.st_ctime
3025 ) {
3026 #if EV_USE_INOTIFY
3027 if (fs_fd >= 0)
3028 {
3029 infy_del (EV_A_ w);
3030 infy_add (EV_A_ w);
3031 ev_stat_stat (EV_A_ w); /* avoid race... */
3032 }
3033 #endif
3034
3035 ev_feed_event (EV_A_ w, EV_STAT);
3036 }
3037 }
3038
3039 void
3040 ev_stat_start (EV_P_ ev_stat *w)
3041 {
3042 if (expect_false (ev_is_active (w)))
3043 return;
3044
3045 ev_stat_stat (EV_A_ w);
3046
3047 if (w->interval < MIN_STAT_INTERVAL && w->interval)
3048 w->interval = MIN_STAT_INTERVAL;
3049
3050 ev_timer_init (&w->timer, stat_timer_cb, 0., w->interval ? w->interval : DEF_STAT_INTERVAL);
3051 ev_set_priority (&w->timer, ev_priority (w));
3052
3053 #if EV_USE_INOTIFY
3054 infy_init (EV_A);
3055
3056 if (fs_fd >= 0)
3057 infy_add (EV_A_ w);
3058 else
3059 #endif
3060 ev_timer_again (EV_A_ &w->timer);
3061
3062 ev_start (EV_A_ (W)w, 1);
3063
3064 EV_FREQUENT_CHECK;
3065 }
3066
3067 void
3068 ev_stat_stop (EV_P_ ev_stat *w)
3069 {
3070 clear_pending (EV_A_ (W)w);
3071 if (expect_false (!ev_is_active (w)))
3072 return;
3073
3074 EV_FREQUENT_CHECK;
3075
3076 #if EV_USE_INOTIFY
3077 infy_del (EV_A_ w);
3078 #endif
3079 ev_timer_stop (EV_A_ &w->timer);
3080
3081 ev_stop (EV_A_ (W)w);
3082
3083 EV_FREQUENT_CHECK;
3084 }
3085 #endif
3086
3087 #if EV_IDLE_ENABLE
3088 void
3089 ev_idle_start (EV_P_ ev_idle *w)
3090 {
3091 if (expect_false (ev_is_active (w)))
3092 return;
3093
3094 pri_adjust (EV_A_ (W)w);
3095
3096 EV_FREQUENT_CHECK;
3097
3098 {
3099 int active = ++idlecnt [ABSPRI (w)];
3100
3101 ++idleall;
3102 ev_start (EV_A_ (W)w, active);
3103
3104 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
3105 idles [ABSPRI (w)][active - 1] = w;
3106 }
3107
3108 EV_FREQUENT_CHECK;
3109 }
3110
3111 void
3112 ev_idle_stop (EV_P_ ev_idle *w)
3113 {
3114 clear_pending (EV_A_ (W)w);
3115 if (expect_false (!ev_is_active (w)))
3116 return;
3117
3118 EV_FREQUENT_CHECK;
3119
3120 {
3121 int active = ev_active (w);
3122
3123 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
3124 ev_active (idles [ABSPRI (w)][active - 1]) = active;
3125
3126 ev_stop (EV_A_ (W)w);
3127 --idleall;
3128 }
3129
3130 EV_FREQUENT_CHECK;
3131 }
3132 #endif
3133
3134 void
3135 ev_prepare_start (EV_P_ ev_prepare *w)
3136 {
3137 if (expect_false (ev_is_active (w)))
3138 return;
3139
3140 EV_FREQUENT_CHECK;
3141
3142 ev_start (EV_A_ (W)w, ++preparecnt);
3143 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
3144 prepares [preparecnt - 1] = w;
3145
3146 EV_FREQUENT_CHECK;
3147 }
3148
3149 void
3150 ev_prepare_stop (EV_P_ ev_prepare *w)
3151 {
3152 clear_pending (EV_A_ (W)w);
3153 if (expect_false (!ev_is_active (w)))
3154 return;
3155
3156 EV_FREQUENT_CHECK;
3157
3158 {
3159 int active = ev_active (w);
3160
3161 prepares [active - 1] = prepares [--preparecnt];
3162 ev_active (prepares [active - 1]) = active;
3163 }
3164
3165 ev_stop (EV_A_ (W)w);
3166
3167 EV_FREQUENT_CHECK;
3168 }
3169
3170 void
3171 ev_check_start (EV_P_ ev_check *w)
3172 {
3173 if (expect_false (ev_is_active (w)))
3174 return;
3175
3176 EV_FREQUENT_CHECK;
3177
3178 ev_start (EV_A_ (W)w, ++checkcnt);
3179 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
3180 checks [checkcnt - 1] = w;
3181
3182 EV_FREQUENT_CHECK;
3183 }
3184
3185 void
3186 ev_check_stop (EV_P_ ev_check *w)
3187 {
3188 clear_pending (EV_A_ (W)w);
3189 if (expect_false (!ev_is_active (w)))
3190 return;
3191
3192 EV_FREQUENT_CHECK;
3193
3194 {
3195 int active = ev_active (w);
3196
3197 checks [active - 1] = checks [--checkcnt];
3198 ev_active (checks [active - 1]) = active;
3199 }
3200
3201 ev_stop (EV_A_ (W)w);
3202
3203 EV_FREQUENT_CHECK;
3204 }
3205
3206 #if EV_EMBED_ENABLE
3207 void noinline
3208 ev_embed_sweep (EV_P_ ev_embed *w)
3209 {
3210 ev_loop (w->other, EVLOOP_NONBLOCK);
3211 }
3212
3213 static void
3214 embed_io_cb (EV_P_ ev_io *io, int revents)
3215 {
3216 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
3217
3218 if (ev_cb (w))
3219 ev_feed_event (EV_A_ (W)w, EV_EMBED);
3220 else
3221 ev_loop (w->other, EVLOOP_NONBLOCK);
3222 }
3223
3224 static void
3225 embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
3226 {
3227 ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
3228
3229 {
3230 struct ev_loop *loop = w->other;
3231
3232 while (fdchangecnt)
3233 {
3234 fd_reify (EV_A);
3235 ev_loop (EV_A_ EVLOOP_NONBLOCK);
3236 }
3237 }
3238 }
3239
3240 static void
3241 embed_fork_cb (EV_P_ ev_fork *fork_w, int revents)
3242 {
3243 ev_embed *w = (ev_embed *)(((char *)fork_w) - offsetof (ev_embed, fork));
3244
3245 ev_embed_stop (EV_A_ w);
3246
3247 {
3248 struct ev_loop *loop = w->other;
3249
3250 ev_loop_fork (EV_A);
3251 ev_loop (EV_A_ EVLOOP_NONBLOCK);
3252 }
3253
3254 ev_embed_start (EV_A_ w);
3255 }
3256
3257 #if 0
3258 static void
3259 embed_idle_cb (EV_P_ ev_idle *idle, int revents)
3260 {
3261 ev_idle_stop (EV_A_ idle);
3262 }
3263 #endif
3264
3265 void
3266 ev_embed_start (EV_P_ ev_embed *w)
3267 {
3268 if (expect_false (ev_is_active (w)))
3269 return;
3270
3271 {
3272 struct ev_loop *loop = w->other;
3273 assert (("libev: loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
3274 ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
3275 }
3276
3277 EV_FREQUENT_CHECK;
3278
3279 ev_set_priority (&w->io, ev_priority (w));
3280 ev_io_start (EV_A_ &w->io);
3281
3282 ev_prepare_init (&w->prepare, embed_prepare_cb);
3283 ev_set_priority (&w->prepare, EV_MINPRI);
3284 ev_prepare_start (EV_A_ &w->prepare);
3285
3286 ev_fork_init (&w->fork, embed_fork_cb);
3287 ev_fork_start (EV_A_ &w->fork);
3288
3289 /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
3290
3291 ev_start (EV_A_ (W)w, 1);
3292
3293 EV_FREQUENT_CHECK;
3294 }
3295
3296 void
3297 ev_embed_stop (EV_P_ ev_embed *w)
3298 {
3299 clear_pending (EV_A_ (W)w);
3300 if (expect_false (!ev_is_active (w)))
3301 return;
3302
3303 EV_FREQUENT_CHECK;
3304
3305 ev_io_stop (EV_A_ &w->io);
3306 ev_prepare_stop (EV_A_ &w->prepare);
3307 ev_fork_stop (EV_A_ &w->fork);
3308
3309 EV_FREQUENT_CHECK;
3310 }
3311 #endif
3312
3313 #if EV_FORK_ENABLE
3314 void
3315 ev_fork_start (EV_P_ ev_fork *w)
3316 {
3317 if (expect_false (ev_is_active (w)))
3318 return;
3319
3320 EV_FREQUENT_CHECK;
3321
3322 ev_start (EV_A_ (W)w, ++forkcnt);
3323 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
3324 forks [forkcnt - 1] = w;
3325
3326 EV_FREQUENT_CHECK;
3327 }
3328
3329 void
3330 ev_fork_stop (EV_P_ ev_fork *w)
3331 {
3332 clear_pending (EV_A_ (W)w);
3333 if (expect_false (!ev_is_active (w)))
3334 return;
3335
3336 EV_FREQUENT_CHECK;
3337
3338 {
3339 int active = ev_active (w);
3340
3341 forks [active - 1] = forks [--forkcnt];
3342 ev_active (forks [active - 1]) = active;
3343 }
3344
3345 ev_stop (EV_A_ (W)w);
3346
3347 EV_FREQUENT_CHECK;
3348 }
3349 #endif
3350
3351 #if EV_ASYNC_ENABLE
3352 void
3353 ev_async_start (EV_P_ ev_async *w)
3354 {
3355 if (expect_false (ev_is_active (w)))
3356 return;
3357
3358 evpipe_init (EV_A);
3359
3360 EV_FREQUENT_CHECK;
3361
3362 ev_start (EV_A_ (W)w, ++asynccnt);
3363 array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
3364 asyncs [asynccnt - 1] = w;
3365
3366 EV_FREQUENT_CHECK;
3367 }
3368
3369 void
3370 ev_async_stop (EV_P_ ev_async *w)
3371 {
3372 clear_pending (EV_A_ (W)w);
3373 if (expect_false (!ev_is_active (w)))
3374 return;
3375
3376 EV_FREQUENT_CHECK;
3377
3378 {
3379 int active = ev_active (w);
3380
3381 asyncs [active - 1] = asyncs [--asynccnt];
3382 ev_active (asyncs [active - 1]) = active;
3383 }
3384
3385 ev_stop (EV_A_ (W)w);
3386
3387 EV_FREQUENT_CHECK;
3388 }
3389
3390 void
3391 ev_async_send (EV_P_ ev_async *w)
3392 {
3393 w->sent = 1;
3394 evpipe_write (EV_A_ &gotasync);
3395 }
3396 #endif
3397
3398 /*****************************************************************************/
3399
3400 struct ev_once
3401 {
3402 ev_io io;
3403 ev_timer to;
3404 void (*cb)(int revents, void *arg);
3405 void *arg;
3406 };
3407
3408 static void
3409 once_cb (EV_P_ struct ev_once *once, int revents)
3410 {
3411 void (*cb)(int revents, void *arg) = once->cb;
3412 void *arg = once->arg;
3413
3414 ev_io_stop (EV_A_ &once->io);
3415 ev_timer_stop (EV_A_ &once->to);
3416 ev_free (once);
3417
3418 cb (revents, arg);
3419 }
3420
3421 static void
3422 once_cb_io (EV_P_ ev_io *w, int revents)
3423 {
3424 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io));
3425
3426 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->to));
3427 }
3428
3429 static void
3430 once_cb_to (EV_P_ ev_timer *w, int revents)
3431 {
3432 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to));
3433
3434 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->io));
3435 }
3436
3437 void
3438 ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
3439 {
3440 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
3441
3442 if (expect_false (!once))
3443 {
3444 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
3445 return;
3446 }
3447
3448 once->cb = cb;
3449 once->arg = arg;
3450
3451 ev_init (&once->io, once_cb_io);
3452 if (fd >= 0)
3453 {
3454 ev_io_set (&once->io, fd, events);
3455 ev_io_start (EV_A_ &once->io);
3456 }
3457
3458 ev_init (&once->to, once_cb_to);
3459 if (timeout >= 0.)
3460 {
3461 ev_timer_set (&once->to, timeout, 0.);
3462 ev_timer_start (EV_A_ &once->to);
3463 }
3464 }
3465
3466 /*****************************************************************************/
3467
3468 #if EV_WALK_ENABLE
3469 void
3470 ev_walk (EV_P_ int types, void (*cb)(EV_P_ int type, void *w))
3471 {
3472 int i, j;
3473 ev_watcher_list *wl, *wn;
3474
3475 if (types & (EV_IO | EV_EMBED))
3476 for (i = 0; i < anfdmax; ++i)
3477 for (wl = anfds [i].head; wl; )
3478 {
3479 wn = wl->next;
3480
3481 #if EV_EMBED_ENABLE
3482 if (ev_cb ((ev_io *)wl) == embed_io_cb)
3483 {
3484 if (types & EV_EMBED)
3485 cb (EV_A_ EV_EMBED, ((char *)wl) - offsetof (struct ev_embed, io));
3486 }
3487 else
3488 #endif
3489 #if EV_USE_INOTIFY
3490 if (ev_cb ((ev_io *)wl) == infy_cb)
3491 ;
3492 else
3493 #endif
3494 if ((ev_io *)wl != &pipe_w)
3495 if (types & EV_IO)
3496 cb (EV_A_ EV_IO, wl);
3497
3498 wl = wn;
3499 }
3500
3501 if (types & (EV_TIMER | EV_STAT))
3502 for (i = timercnt + HEAP0; i-- > HEAP0; )
3503 #if EV_STAT_ENABLE
3504 /*TODO: timer is not always active*/
3505 if (ev_cb ((ev_timer *)ANHE_w (timers [i])) == stat_timer_cb)
3506 {
3507 if (types & EV_STAT)
3508 cb (EV_A_ EV_STAT, ((char *)ANHE_w (timers [i])) - offsetof (struct ev_stat, timer));
3509 }
3510 else
3511 #endif
3512 if (types & EV_TIMER)
3513 cb (EV_A_ EV_TIMER, ANHE_w (timers [i]));
3514
3515 #if EV_PERIODIC_ENABLE
3516 if (types & EV_PERIODIC)
3517 for (i = periodiccnt + HEAP0; i-- > HEAP0; )
3518 cb (EV_A_ EV_PERIODIC, ANHE_w (periodics [i]));
3519 #endif
3520
3521 #if EV_IDLE_ENABLE
3522 if (types & EV_IDLE)
3523 for (j = NUMPRI; i--; )
3524 for (i = idlecnt [j]; i--; )
3525 cb (EV_A_ EV_IDLE, idles [j][i]);
3526 #endif
3527
3528 #if EV_FORK_ENABLE
3529 if (types & EV_FORK)
3530 for (i = forkcnt; i--; )
3531 if (ev_cb (forks [i]) != embed_fork_cb)
3532 cb (EV_A_ EV_FORK, forks [i]);
3533 #endif
3534
3535 #if EV_ASYNC_ENABLE
3536 if (types & EV_ASYNC)
3537 for (i = asynccnt; i--; )
3538 cb (EV_A_ EV_ASYNC, asyncs [i]);
3539 #endif
3540
3541 if (types & EV_PREPARE)
3542 for (i = preparecnt; i--; )
3543 #if EV_EMBED_ENABLE
3544 if (ev_cb (prepares [i]) != embed_prepare_cb)
3545 #endif
3546 cb (EV_A_ EV_PREPARE, prepares [i]);
3547
3548 if (types & EV_CHECK)
3549 for (i = checkcnt; i--; )
3550 cb (EV_A_ EV_CHECK, checks [i]);
3551
3552 if (types & EV_SIGNAL)
3553 for (i = 0; i < signalmax; ++i)
3554 for (wl = signals [i].head; wl; )
3555 {
3556 wn = wl->next;
3557 cb (EV_A_ EV_SIGNAL, wl);
3558 wl = wn;
3559 }
3560
3561 if (types & EV_CHILD)
3562 for (i = EV_PID_HASHSIZE; i--; )
3563 for (wl = childs [i]; wl; )
3564 {
3565 wn = wl->next;
3566 cb (EV_A_ EV_CHILD, wl);
3567 wl = wn;
3568 }
3569 /* EV_STAT 0x00001000 /* stat data changed */
3570 /* EV_EMBED 0x00010000 /* embedded event loop needs sweep */
3571 }
3572 #endif
3573
3574 #if EV_MULTIPLICITY
3575 #include "ev_wrap.h"
3576 #endif
3577
3578 #ifdef __cplusplus
3579 }
3580 #endif
3581