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Comparing libev/ev.c (file contents):
Revision 1.354 by root, Fri Oct 22 09:24:11 2010 UTC vs.
Revision 1.381 by root, Mon Jun 27 21:29:35 2011 UTC

1/* 1/*
2 * libev event processing core, watcher management 2 * libev event processing core, watcher management
3 * 3 *
4 * Copyright (c) 2007,2008,2009,2010 Marc Alexander Lehmann <libev@schmorp.de> 4 * Copyright (c) 2007,2008,2009,2010,2011 Marc Alexander Lehmann <libev@schmorp.de>
5 * All rights reserved. 5 * All rights reserved.
6 * 6 *
7 * Redistribution and use in source and binary forms, with or without modifica- 7 * Redistribution and use in source and binary forms, with or without modifica-
8 * tion, are permitted provided that the following conditions are met: 8 * tion, are permitted provided that the following conditions are met:
9 * 9 *
10 * 1. Redistributions of source code must retain the above copyright notice, 10 * 1. Redistributions of source code must retain the above copyright notice,
11 * this list of conditions and the following disclaimer. 11 * this list of conditions and the following disclaimer.
12 * 12 *
13 * 2. Redistributions in binary form must reproduce the above copyright 13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the 14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution. 15 * documentation and/or other materials provided with the distribution.
16 * 16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 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- 18 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
19 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO 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- 20 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
21 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 21 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
42# ifdef EV_CONFIG_H 42# ifdef EV_CONFIG_H
43# include EV_CONFIG_H 43# include EV_CONFIG_H
44# else 44# else
45# include "config.h" 45# include "config.h"
46# endif 46# endif
47
48#if HAVE_FLOOR
49# ifndef EV_USE_FLOOR
50# define EV_USE_FLOOR 1
51# endif
52#endif
47 53
48# if HAVE_CLOCK_SYSCALL 54# if HAVE_CLOCK_SYSCALL
49# ifndef EV_USE_CLOCK_SYSCALL 55# ifndef EV_USE_CLOCK_SYSCALL
50# define EV_USE_CLOCK_SYSCALL 1 56# define EV_USE_CLOCK_SYSCALL 1
51# ifndef EV_USE_REALTIME 57# ifndef EV_USE_REALTIME
156# define EV_USE_EVENTFD 0 162# define EV_USE_EVENTFD 0
157# endif 163# endif
158 164
159#endif 165#endif
160 166
161#include <math.h>
162#include <stdlib.h> 167#include <stdlib.h>
163#include <string.h> 168#include <string.h>
164#include <fcntl.h> 169#include <fcntl.h>
165#include <stddef.h> 170#include <stddef.h>
166 171
232/* to make it compile regardless, just remove the above line, */ 237/* to make it compile regardless, just remove the above line, */
233/* but consider reporting it, too! :) */ 238/* but consider reporting it, too! :) */
234# define EV_NSIG 65 239# define EV_NSIG 65
235#endif 240#endif
236 241
242#ifndef EV_USE_FLOOR
243# define EV_USE_FLOOR 0
244#endif
245
237#ifndef EV_USE_CLOCK_SYSCALL 246#ifndef EV_USE_CLOCK_SYSCALL
238# if __linux && __GLIBC__ >= 2 247# if __linux && __GLIBC__ >= 2
239# define EV_USE_CLOCK_SYSCALL EV_FEATURE_OS 248# define EV_USE_CLOCK_SYSCALL EV_FEATURE_OS
240# else 249# else
241# define EV_USE_CLOCK_SYSCALL 0 250# define EV_USE_CLOCK_SYSCALL 0
376# undef EV_USE_INOTIFY 385# undef EV_USE_INOTIFY
377# define EV_USE_INOTIFY 0 386# define EV_USE_INOTIFY 0
378#endif 387#endif
379 388
380#if !EV_USE_NANOSLEEP 389#if !EV_USE_NANOSLEEP
381# ifndef _WIN32 390/* hp-ux has it in sys/time.h, which we unconditionally include above */
391# if !defined(_WIN32) && !defined(__hpux)
382# include <sys/select.h> 392# include <sys/select.h>
383# endif 393# endif
384#endif 394#endif
385 395
386#if EV_USE_INOTIFY 396#if EV_USE_INOTIFY
387# include <sys/utsname.h>
388# include <sys/statfs.h> 397# include <sys/statfs.h>
389# include <sys/inotify.h> 398# include <sys/inotify.h>
390/* some very old inotify.h headers don't have IN_DONT_FOLLOW */ 399/* some very old inotify.h headers don't have IN_DONT_FOLLOW */
391# ifndef IN_DONT_FOLLOW 400# ifndef IN_DONT_FOLLOW
392# undef EV_USE_INOTIFY 401# undef EV_USE_INOTIFY
443#else 452#else
444# define EV_FREQUENT_CHECK do { } while (0) 453# define EV_FREQUENT_CHECK do { } while (0)
445#endif 454#endif
446 455
447/* 456/*
448 * This is used to avoid floating point rounding problems. 457 * This is used to work around floating point rounding problems.
449 * It is added to ev_rt_now when scheduling periodics
450 * to ensure progress, time-wise, even when rounding
451 * errors are against us.
452 * This value is good at least till the year 4000. 458 * This value is good at least till the year 4000.
453 * Better solutions welcome.
454 */ 459 */
455#define TIME_EPSILON 0.0001220703125 /* 1/8192 */ 460#define MIN_INTERVAL 0.0001220703125 /* 1/2**13, good till 4000 */
461/*#define MIN_INTERVAL 0.00000095367431640625 /* 1/2**20, good till 2200 */
456 462
457#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */ 463#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
458#define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */ 464#define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
459 465
460#define EV_TV_SET(tv,t) do { tv.tv_sec = (long)t; tv.tv_usec = (long)((t - tv.tv_sec) * 1e6); } while (0) 466#define EV_TV_SET(tv,t) do { tv.tv_sec = (long)t; tv.tv_usec = (long)((t - tv.tv_sec) * 1e6); } while (0)
461#define EV_TS_SET(ts,t) do { ts.tv_sec = (long)t; ts.tv_nsec = (long)((t - ts.tv_sec) * 1e9); } while (0) 467#define EV_TS_SET(ts,t) do { ts.tv_sec = (long)t; ts.tv_nsec = (long)((t - ts.tv_sec) * 1e9); } while (0)
462 468
463#if __GNUC__ >= 4 469/* the following are taken from libecb */
464# define expect(expr,value) __builtin_expect ((expr),(value)) 470/* ecb.h start */
465# define noinline __attribute__ ((noinline)) 471
472/* many compilers define _GNUC_ to some versions but then only implement
473 * what their idiot authors think are the "more important" extensions,
474 * causing enourmous grief in return for some better fake benchmark numbers.
475 * or so.
476 * we try to detect these and simply assume they are not gcc - if they have
477 * an issue with that they should have done it right in the first place.
478 */
479#ifndef ECB_GCC_VERSION
480 #if !defined(__GNUC_MINOR__) || defined(__INTEL_COMPILER) || defined(__SUNPRO_C) || defined(__SUNPRO_CC) || defined(__llvm__) || defined(__clang__)
481 #define ECB_GCC_VERSION(major,minor) 0
482 #else
483 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
484 #endif
485#endif
486
487#if __cplusplus
488 #define ecb_inline static inline
489#elif ECB_GCC_VERSION(2,5)
490 #define ecb_inline static __inline__
491#elif ECB_C99
492 #define ecb_inline static inline
466#else 493#else
467# define expect(expr,value) (expr) 494 #define ecb_inline static
468# define noinline
469# if __STDC_VERSION__ < 199901L && __GNUC__ < 2
470# define inline
471# endif 495#endif
472#endif
473 496
497#if ECB_GCC_VERSION(3,1)
498 #define ecb_attribute(attrlist) __attribute__(attrlist)
499 #define ecb_is_constant(expr) __builtin_constant_p (expr)
500 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
501 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
502#else
503 #define ecb_attribute(attrlist)
504 #define ecb_is_constant(expr) 0
505 #define ecb_expect(expr,value) (expr)
506 #define ecb_prefetch(addr,rw,locality)
507#endif
508
509#define ecb_noinline ecb_attribute ((__noinline__))
510#define ecb_noreturn ecb_attribute ((__noreturn__))
511#define ecb_unused ecb_attribute ((__unused__))
512#define ecb_const ecb_attribute ((__const__))
513#define ecb_pure ecb_attribute ((__pure__))
514
515#if ECB_GCC_VERSION(4,3)
516 #define ecb_artificial ecb_attribute ((__artificial__))
517 #define ecb_hot ecb_attribute ((__hot__))
518 #define ecb_cold ecb_attribute ((__cold__))
519#else
520 #define ecb_artificial
521 #define ecb_hot
522 #define ecb_cold
523#endif
524
525/* put around conditional expressions if you are very sure that the */
526/* expression is mostly true or mostly false. note that these return */
527/* booleans, not the expression. */
474#define expect_false(expr) expect ((expr) != 0, 0) 528#define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
475#define expect_true(expr) expect ((expr) != 0, 1) 529#define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
530/* ecb.h end */
531
532#define expect_false(cond) ecb_expect_false (cond)
533#define expect_true(cond) ecb_expect_true (cond)
534#define noinline ecb_noinline
535
476#define inline_size static inline 536#define inline_size ecb_inline
477 537
478#if EV_FEATURE_CODE 538#if EV_FEATURE_CODE
479# define inline_speed static inline 539# define inline_speed ecb_inline
480#else 540#else
481# define inline_speed static noinline 541# define inline_speed static noinline
482#endif 542#endif
483 543
484#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1) 544#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
523# include "ev_win32.c" 583# include "ev_win32.c"
524#endif 584#endif
525 585
526/*****************************************************************************/ 586/*****************************************************************************/
527 587
588/* define a suitable floor function (only used by periodics atm) */
589
590#if EV_USE_FLOOR
591# include <math.h>
592# define ev_floor(v) floor (v)
593#else
594
595#include <float.h>
596
597/* a floor() replacement function, should be independent of ev_tstamp type */
598static ev_tstamp noinline
599ev_floor (ev_tstamp v)
600{
601 /* the choice of shift factor is not terribly important */
602#if FLT_RADIX != 2 /* assume FLT_RADIX == 10 */
603 const ev_tstamp shift = sizeof (unsigned long) >= 8 ? 10000000000000000000. : 1000000000.;
604#else
605 const ev_tstamp shift = sizeof (unsigned long) >= 8 ? 18446744073709551616. : 4294967296.;
606#endif
607
608 /* argument too large for an unsigned long? */
609 if (expect_false (v >= shift))
610 {
611 ev_tstamp f;
612
613 if (v == v - 1.)
614 return v; /* very large number */
615
616 f = shift * ev_floor (v * (1. / shift));
617 return f + ev_floor (v - f);
618 }
619
620 /* special treatment for negative args? */
621 if (expect_false (v < 0.))
622 {
623 ev_tstamp f = -ev_floor (-v);
624
625 return f - (f == v ? 0 : 1);
626 }
627
628 /* fits into an unsigned long */
629 return (unsigned long)v;
630}
631
632#endif
633
634/*****************************************************************************/
635
636#ifdef __linux
637# include <sys/utsname.h>
638#endif
639
640static unsigned int noinline ecb_cold
641ev_linux_version (void)
642{
643#ifdef __linux
644 unsigned int v = 0;
645 struct utsname buf;
646 int i;
647 char *p = buf.release;
648
649 if (uname (&buf))
650 return 0;
651
652 for (i = 3+1; --i; )
653 {
654 unsigned int c = 0;
655
656 for (;;)
657 {
658 if (*p >= '0' && *p <= '9')
659 c = c * 10 + *p++ - '0';
660 else
661 {
662 p += *p == '.';
663 break;
664 }
665 }
666
667 v = (v << 8) | c;
668 }
669
670 return v;
671#else
672 return 0;
673#endif
674}
675
676/*****************************************************************************/
677
528#if EV_AVOID_STDIO 678#if EV_AVOID_STDIO
529static void noinline 679static void noinline ecb_cold
530ev_printerr (const char *msg) 680ev_printerr (const char *msg)
531{ 681{
532 write (STDERR_FILENO, msg, strlen (msg)); 682 write (STDERR_FILENO, msg, strlen (msg));
533} 683}
534#endif 684#endif
535 685
536static void (*syserr_cb)(const char *msg); 686static void (*syserr_cb)(const char *msg);
537 687
538void 688void ecb_cold
539ev_set_syserr_cb (void (*cb)(const char *msg)) 689ev_set_syserr_cb (void (*cb)(const char *msg))
540{ 690{
541 syserr_cb = cb; 691 syserr_cb = cb;
542} 692}
543 693
544static void noinline 694static void noinline ecb_cold
545ev_syserr (const char *msg) 695ev_syserr (const char *msg)
546{ 696{
547 if (!msg) 697 if (!msg)
548 msg = "(libev) system error"; 698 msg = "(libev) system error";
549 699
550 if (syserr_cb) 700 if (syserr_cb)
551 syserr_cb (msg); 701 syserr_cb (msg);
552 else 702 else
553 { 703 {
554#if EV_AVOID_STDIO 704#if EV_AVOID_STDIO
555 const char *err = strerror (errno);
556
557 ev_printerr (msg); 705 ev_printerr (msg);
558 ev_printerr (": "); 706 ev_printerr (": ");
559 ev_printerr (err); 707 ev_printerr (strerror (errno));
560 ev_printerr ("\n"); 708 ev_printerr ("\n");
561#else 709#else
562 perror (msg); 710 perror (msg);
563#endif 711#endif
564 abort (); 712 abort ();
584#endif 732#endif
585} 733}
586 734
587static void *(*alloc)(void *ptr, long size) = ev_realloc_emul; 735static void *(*alloc)(void *ptr, long size) = ev_realloc_emul;
588 736
589void 737void ecb_cold
590ev_set_allocator (void *(*cb)(void *ptr, long size)) 738ev_set_allocator (void *(*cb)(void *ptr, long size))
591{ 739{
592 alloc = cb; 740 alloc = cb;
593} 741}
594 742
598 ptr = alloc (ptr, size); 746 ptr = alloc (ptr, size);
599 747
600 if (!ptr && size) 748 if (!ptr && size)
601 { 749 {
602#if EV_AVOID_STDIO 750#if EV_AVOID_STDIO
603 ev_printerr ("libev: memory allocation failed, aborting.\n"); 751 ev_printerr ("(libev) memory allocation failed, aborting.\n");
604#else 752#else
605 fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size); 753 fprintf (stderr, "(libev) cannot allocate %ld bytes, aborting.", size);
606#endif 754#endif
607 abort (); 755 abort ();
608 } 756 }
609 757
610 return ptr; 758 return ptr;
627 unsigned char emask; /* the epoll backend stores the actual kernel mask in here */ 775 unsigned char emask; /* the epoll backend stores the actual kernel mask in here */
628 unsigned char unused; 776 unsigned char unused;
629#if EV_USE_EPOLL 777#if EV_USE_EPOLL
630 unsigned int egen; /* generation counter to counter epoll bugs */ 778 unsigned int egen; /* generation counter to counter epoll bugs */
631#endif 779#endif
632#if EV_SELECT_IS_WINSOCKET 780#if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
633 SOCKET handle; 781 SOCKET handle;
782#endif
783#if EV_USE_IOCP
784 OVERLAPPED or, ow;
634#endif 785#endif
635} ANFD; 786} ANFD;
636 787
637/* stores the pending event set for a given watcher */ 788/* stores the pending event set for a given watcher */
638typedef struct 789typedef struct
800 } 951 }
801 952
802 return ncur; 953 return ncur;
803} 954}
804 955
805static noinline void * 956static void * noinline ecb_cold
806array_realloc (int elem, void *base, int *cur, int cnt) 957array_realloc (int elem, void *base, int *cur, int cnt)
807{ 958{
808 *cur = array_nextsize (elem, *cur, cnt); 959 *cur = array_nextsize (elem, *cur, cnt);
809 return ev_realloc (base, elem * *cur); 960 return ev_realloc (base, elem * *cur);
810} 961}
923inline_size void 1074inline_size void
924fd_reify (EV_P) 1075fd_reify (EV_P)
925{ 1076{
926 int i; 1077 int i;
927 1078
1079#if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
1080 for (i = 0; i < fdchangecnt; ++i)
1081 {
1082 int fd = fdchanges [i];
1083 ANFD *anfd = anfds + fd;
1084
1085 if (anfd->reify & EV__IOFDSET && anfd->head)
1086 {
1087 SOCKET handle = EV_FD_TO_WIN32_HANDLE (fd);
1088
1089 if (handle != anfd->handle)
1090 {
1091 unsigned long arg;
1092
1093 assert (("libev: only socket fds supported in this configuration", ioctlsocket (handle, FIONREAD, &arg) == 0));
1094
1095 /* handle changed, but fd didn't - we need to do it in two steps */
1096 backend_modify (EV_A_ fd, anfd->events, 0);
1097 anfd->events = 0;
1098 anfd->handle = handle;
1099 }
1100 }
1101 }
1102#endif
1103
928 for (i = 0; i < fdchangecnt; ++i) 1104 for (i = 0; i < fdchangecnt; ++i)
929 { 1105 {
930 int fd = fdchanges [i]; 1106 int fd = fdchanges [i];
931 ANFD *anfd = anfds + fd; 1107 ANFD *anfd = anfds + fd;
932 ev_io *w; 1108 ev_io *w;
934 unsigned char o_events = anfd->events; 1110 unsigned char o_events = anfd->events;
935 unsigned char o_reify = anfd->reify; 1111 unsigned char o_reify = anfd->reify;
936 1112
937 anfd->reify = 0; 1113 anfd->reify = 0;
938 1114
939#if EV_SELECT_IS_WINSOCKET
940 if (o_reify & EV__IOFDSET)
941 {
942 unsigned long arg;
943 anfd->handle = EV_FD_TO_WIN32_HANDLE (fd);
944 assert (("libev: only socket fds supported in this configuration", ioctlsocket (anfd->handle, FIONREAD, &arg) == 0));
945 }
946#endif
947
948 /*if (expect_true (o_reify & EV_ANFD_REIFY)) probably a deoptimisation */ 1115 /*if (expect_true (o_reify & EV_ANFD_REIFY)) probably a deoptimisation */
949 { 1116 {
950 anfd->events = 0; 1117 anfd->events = 0;
951 1118
952 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next) 1119 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
977 fdchanges [fdchangecnt - 1] = fd; 1144 fdchanges [fdchangecnt - 1] = fd;
978 } 1145 }
979} 1146}
980 1147
981/* the given fd is invalid/unusable, so make sure it doesn't hurt us anymore */ 1148/* the given fd is invalid/unusable, so make sure it doesn't hurt us anymore */
982inline_speed void 1149inline_speed void ecb_cold
983fd_kill (EV_P_ int fd) 1150fd_kill (EV_P_ int fd)
984{ 1151{
985 ev_io *w; 1152 ev_io *w;
986 1153
987 while ((w = (ev_io *)anfds [fd].head)) 1154 while ((w = (ev_io *)anfds [fd].head))
990 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE); 1157 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
991 } 1158 }
992} 1159}
993 1160
994/* check whether the given fd is actually valid, for error recovery */ 1161/* check whether the given fd is actually valid, for error recovery */
995inline_size int 1162inline_size int ecb_cold
996fd_valid (int fd) 1163fd_valid (int fd)
997{ 1164{
998#ifdef _WIN32 1165#ifdef _WIN32
999 return EV_FD_TO_WIN32_HANDLE (fd) != -1; 1166 return EV_FD_TO_WIN32_HANDLE (fd) != -1;
1000#else 1167#else
1001 return fcntl (fd, F_GETFD) != -1; 1168 return fcntl (fd, F_GETFD) != -1;
1002#endif 1169#endif
1003} 1170}
1004 1171
1005/* called on EBADF to verify fds */ 1172/* called on EBADF to verify fds */
1006static void noinline 1173static void noinline ecb_cold
1007fd_ebadf (EV_P) 1174fd_ebadf (EV_P)
1008{ 1175{
1009 int fd; 1176 int fd;
1010 1177
1011 for (fd = 0; fd < anfdmax; ++fd) 1178 for (fd = 0; fd < anfdmax; ++fd)
1013 if (!fd_valid (fd) && errno == EBADF) 1180 if (!fd_valid (fd) && errno == EBADF)
1014 fd_kill (EV_A_ fd); 1181 fd_kill (EV_A_ fd);
1015} 1182}
1016 1183
1017/* called on ENOMEM in select/poll to kill some fds and retry */ 1184/* called on ENOMEM in select/poll to kill some fds and retry */
1018static void noinline 1185static void noinline ecb_cold
1019fd_enomem (EV_P) 1186fd_enomem (EV_P)
1020{ 1187{
1021 int fd; 1188 int fd;
1022 1189
1023 for (fd = anfdmax; fd--; ) 1190 for (fd = anfdmax; fd--; )
1218 1385
1219/*****************************************************************************/ 1386/*****************************************************************************/
1220 1387
1221#if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE 1388#if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
1222 1389
1223static void noinline 1390static void noinline ecb_cold
1224evpipe_init (EV_P) 1391evpipe_init (EV_P)
1225{ 1392{
1226 if (!ev_is_active (&pipe_w)) 1393 if (!ev_is_active (&pipe_w))
1227 { 1394 {
1228# if EV_USE_EVENTFD 1395# if EV_USE_EVENTFD
1250 ev_io_start (EV_A_ &pipe_w); 1417 ev_io_start (EV_A_ &pipe_w);
1251 ev_unref (EV_A); /* watcher should not keep loop alive */ 1418 ev_unref (EV_A); /* watcher should not keep loop alive */
1252 } 1419 }
1253} 1420}
1254 1421
1255inline_size void 1422inline_speed void
1256evpipe_write (EV_P_ EV_ATOMIC_T *flag) 1423evpipe_write (EV_P_ EV_ATOMIC_T *flag)
1257{ 1424{
1258 if (!*flag) 1425 if (!*flag)
1259 { 1426 {
1260 int old_errno = errno; /* save errno because write might clobber it */
1261 char dummy;
1262
1263 *flag = 1; 1427 *flag = 1;
1264 1428
1429 pipe_write_skipped = 1;
1430
1431 if (pipe_write_wanted)
1432 {
1433 int old_errno;
1434
1435 pipe_write_skipped = 0;
1436
1437 old_errno = errno; /* save errno because write will clobber it */
1438
1265#if EV_USE_EVENTFD 1439#if EV_USE_EVENTFD
1266 if (evfd >= 0) 1440 if (evfd >= 0)
1267 { 1441 {
1268 uint64_t counter = 1; 1442 uint64_t counter = 1;
1269 write (evfd, &counter, sizeof (uint64_t)); 1443 write (evfd, &counter, sizeof (uint64_t));
1444 }
1445 else
1446#endif
1447 {
1448 /* win32 people keep sending patches that change this write() to send() */
1449 /* and then run away. but send() is wrong, it wants a socket handle on win32 */
1450 /* so when you think this write should be a send instead, please find out */
1451 /* where your send() is from - it's definitely not the microsoft send, and */
1452 /* tell me. thank you. */
1453 write (evpipe [1], &(evpipe [1]), 1);
1454 }
1455
1456 errno = old_errno;
1270 } 1457 }
1271 else
1272#endif
1273 /* win32 people keep sending patches that change this write() to send() */
1274 /* and then run away. but send() is wrong, it wants a socket handle on win32 */
1275 /* so when you think this write should be a send instead, please find out */
1276 /* where your send() is from - it's definitely not the microsoft send, and */
1277 /* tell me. thank you. */
1278 write (evpipe [1], &dummy, 1);
1279
1280 errno = old_errno;
1281 } 1458 }
1282} 1459}
1283 1460
1284/* called whenever the libev signal pipe */ 1461/* called whenever the libev signal pipe */
1285/* got some events (signal, async) */ 1462/* got some events (signal, async) */
1286static void 1463static void
1287pipecb (EV_P_ ev_io *iow, int revents) 1464pipecb (EV_P_ ev_io *iow, int revents)
1288{ 1465{
1289 int i; 1466 int i;
1290 1467
1468 if (revents & EV_READ)
1469 {
1291#if EV_USE_EVENTFD 1470#if EV_USE_EVENTFD
1292 if (evfd >= 0) 1471 if (evfd >= 0)
1293 { 1472 {
1294 uint64_t counter; 1473 uint64_t counter;
1295 read (evfd, &counter, sizeof (uint64_t)); 1474 read (evfd, &counter, sizeof (uint64_t));
1296 } 1475 }
1297 else 1476 else
1298#endif 1477#endif
1299 { 1478 {
1300 char dummy; 1479 char dummy;
1301 /* see discussion in evpipe_write when you think this read should be recv in win32 */ 1480 /* see discussion in evpipe_write when you think this read should be recv in win32 */
1302 read (evpipe [0], &dummy, 1); 1481 read (evpipe [0], &dummy, 1);
1482 }
1303 } 1483 }
1304 1484
1485 pipe_write_skipped = 0;
1486
1487#if EV_SIGNAL_ENABLE
1305 if (sig_pending) 1488 if (sig_pending)
1306 { 1489 {
1307 sig_pending = 0; 1490 sig_pending = 0;
1308 1491
1309 for (i = EV_NSIG - 1; i--; ) 1492 for (i = EV_NSIG - 1; i--; )
1310 if (expect_false (signals [i].pending)) 1493 if (expect_false (signals [i].pending))
1311 ev_feed_signal_event (EV_A_ i + 1); 1494 ev_feed_signal_event (EV_A_ i + 1);
1312 } 1495 }
1496#endif
1313 1497
1314#if EV_ASYNC_ENABLE 1498#if EV_ASYNC_ENABLE
1315 if (async_pending) 1499 if (async_pending)
1316 { 1500 {
1317 async_pending = 0; 1501 async_pending = 0;
1326#endif 1510#endif
1327} 1511}
1328 1512
1329/*****************************************************************************/ 1513/*****************************************************************************/
1330 1514
1515void
1516ev_feed_signal (int signum)
1517{
1518#if EV_MULTIPLICITY
1519 EV_P = signals [signum - 1].loop;
1520
1521 if (!EV_A)
1522 return;
1523#endif
1524
1525 if (!ev_active (&pipe_w))
1526 return;
1527
1528 signals [signum - 1].pending = 1;
1529 evpipe_write (EV_A_ &sig_pending);
1530}
1531
1331static void 1532static void
1332ev_sighandler (int signum) 1533ev_sighandler (int signum)
1333{ 1534{
1334#if EV_MULTIPLICITY
1335 EV_P = signals [signum - 1].loop;
1336#endif
1337
1338#ifdef _WIN32 1535#ifdef _WIN32
1339 signal (signum, ev_sighandler); 1536 signal (signum, ev_sighandler);
1340#endif 1537#endif
1341 1538
1342 signals [signum - 1].pending = 1; 1539 ev_feed_signal (signum);
1343 evpipe_write (EV_A_ &sig_pending);
1344} 1540}
1345 1541
1346void noinline 1542void noinline
1347ev_feed_signal_event (EV_P_ int signum) 1543ev_feed_signal_event (EV_P_ int signum)
1348{ 1544{
1448 1644
1449#endif 1645#endif
1450 1646
1451/*****************************************************************************/ 1647/*****************************************************************************/
1452 1648
1649#if EV_USE_IOCP
1650# include "ev_iocp.c"
1651#endif
1453#if EV_USE_PORT 1652#if EV_USE_PORT
1454# include "ev_port.c" 1653# include "ev_port.c"
1455#endif 1654#endif
1456#if EV_USE_KQUEUE 1655#if EV_USE_KQUEUE
1457# include "ev_kqueue.c" 1656# include "ev_kqueue.c"
1464#endif 1663#endif
1465#if EV_USE_SELECT 1664#if EV_USE_SELECT
1466# include "ev_select.c" 1665# include "ev_select.c"
1467#endif 1666#endif
1468 1667
1469int 1668int ecb_cold
1470ev_version_major (void) 1669ev_version_major (void)
1471{ 1670{
1472 return EV_VERSION_MAJOR; 1671 return EV_VERSION_MAJOR;
1473} 1672}
1474 1673
1475int 1674int ecb_cold
1476ev_version_minor (void) 1675ev_version_minor (void)
1477{ 1676{
1478 return EV_VERSION_MINOR; 1677 return EV_VERSION_MINOR;
1479} 1678}
1480 1679
1481/* return true if we are running with elevated privileges and should ignore env variables */ 1680/* return true if we are running with elevated privileges and should ignore env variables */
1482int inline_size 1681int inline_size ecb_cold
1483enable_secure (void) 1682enable_secure (void)
1484{ 1683{
1485#ifdef _WIN32 1684#ifdef _WIN32
1486 return 0; 1685 return 0;
1487#else 1686#else
1488 return getuid () != geteuid () 1687 return getuid () != geteuid ()
1489 || getgid () != getegid (); 1688 || getgid () != getegid ();
1490#endif 1689#endif
1491} 1690}
1492 1691
1493unsigned int 1692unsigned int ecb_cold
1494ev_supported_backends (void) 1693ev_supported_backends (void)
1495{ 1694{
1496 unsigned int flags = 0; 1695 unsigned int flags = 0;
1497 1696
1498 if (EV_USE_PORT ) flags |= EVBACKEND_PORT; 1697 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
1502 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT; 1701 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
1503 1702
1504 return flags; 1703 return flags;
1505} 1704}
1506 1705
1507unsigned int 1706unsigned int ecb_cold
1508ev_recommended_backends (void) 1707ev_recommended_backends (void)
1509{ 1708{
1510 unsigned int flags = ev_supported_backends (); 1709 unsigned int flags = ev_supported_backends ();
1511 1710
1512#ifndef __NetBSD__ 1711#ifndef __NetBSD__
1524#endif 1723#endif
1525 1724
1526 return flags; 1725 return flags;
1527} 1726}
1528 1727
1529unsigned int 1728unsigned int ecb_cold
1530ev_embeddable_backends (void) 1729ev_embeddable_backends (void)
1531{ 1730{
1532 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT; 1731 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
1533 1732
1534 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */ 1733 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
1535 /* please fix it and tell me how to detect the fix */ 1734 if (ev_linux_version () < 0x020620) /* disable it on linux < 2.6.32 */
1536 flags &= ~EVBACKEND_EPOLL; 1735 flags &= ~EVBACKEND_EPOLL;
1537 1736
1538 return flags; 1737 return flags;
1539} 1738}
1540 1739
1541unsigned int 1740unsigned int
1579ev_userdata (EV_P) 1778ev_userdata (EV_P)
1580{ 1779{
1581 return userdata; 1780 return userdata;
1582} 1781}
1583 1782
1783void
1584void ev_set_invoke_pending_cb (EV_P_ void (*invoke_pending_cb)(EV_P)) 1784ev_set_invoke_pending_cb (EV_P_ void (*invoke_pending_cb)(EV_P))
1585{ 1785{
1586 invoke_cb = invoke_pending_cb; 1786 invoke_cb = invoke_pending_cb;
1587} 1787}
1588 1788
1789void
1589void ev_set_loop_release_cb (EV_P_ void (*release)(EV_P), void (*acquire)(EV_P)) 1790ev_set_loop_release_cb (EV_P_ void (*release)(EV_P), void (*acquire)(EV_P))
1590{ 1791{
1591 release_cb = release; 1792 release_cb = release;
1592 acquire_cb = acquire; 1793 acquire_cb = acquire;
1593} 1794}
1594#endif 1795#endif
1595 1796
1596/* initialise a loop structure, must be zero-initialised */ 1797/* initialise a loop structure, must be zero-initialised */
1597static void noinline 1798static void noinline ecb_cold
1598loop_init (EV_P_ unsigned int flags) 1799loop_init (EV_P_ unsigned int flags)
1599{ 1800{
1600 if (!backend) 1801 if (!backend)
1601 { 1802 {
1803 origflags = flags;
1804
1602#if EV_USE_REALTIME 1805#if EV_USE_REALTIME
1603 if (!have_realtime) 1806 if (!have_realtime)
1604 { 1807 {
1605 struct timespec ts; 1808 struct timespec ts;
1606 1809
1628 if (!(flags & EVFLAG_NOENV) 1831 if (!(flags & EVFLAG_NOENV)
1629 && !enable_secure () 1832 && !enable_secure ()
1630 && getenv ("LIBEV_FLAGS")) 1833 && getenv ("LIBEV_FLAGS"))
1631 flags = atoi (getenv ("LIBEV_FLAGS")); 1834 flags = atoi (getenv ("LIBEV_FLAGS"));
1632 1835
1633 ev_rt_now = ev_time (); 1836 ev_rt_now = ev_time ();
1634 mn_now = get_clock (); 1837 mn_now = get_clock ();
1635 now_floor = mn_now; 1838 now_floor = mn_now;
1636 rtmn_diff = ev_rt_now - mn_now; 1839 rtmn_diff = ev_rt_now - mn_now;
1637#if EV_FEATURE_API 1840#if EV_FEATURE_API
1638 invoke_cb = ev_invoke_pending; 1841 invoke_cb = ev_invoke_pending;
1639#endif 1842#endif
1640 1843
1641 io_blocktime = 0.; 1844 io_blocktime = 0.;
1642 timeout_blocktime = 0.; 1845 timeout_blocktime = 0.;
1643 backend = 0; 1846 backend = 0;
1644 backend_fd = -1; 1847 backend_fd = -1;
1645 sig_pending = 0; 1848 sig_pending = 0;
1646#if EV_ASYNC_ENABLE 1849#if EV_ASYNC_ENABLE
1647 async_pending = 0; 1850 async_pending = 0;
1648#endif 1851#endif
1852 pipe_write_skipped = 0;
1853 pipe_write_wanted = 0;
1649#if EV_USE_INOTIFY 1854#if EV_USE_INOTIFY
1650 fs_fd = flags & EVFLAG_NOINOTIFY ? -1 : -2; 1855 fs_fd = flags & EVFLAG_NOINOTIFY ? -1 : -2;
1651#endif 1856#endif
1652#if EV_USE_SIGNALFD 1857#if EV_USE_SIGNALFD
1653 sigfd = flags & EVFLAG_SIGNALFD ? -2 : -1; 1858 sigfd = flags & EVFLAG_SIGNALFD ? -2 : -1;
1654#endif 1859#endif
1655 1860
1656 if (!(flags & 0x0000ffffU)) 1861 if (!(flags & EVBACKEND_MASK))
1657 flags |= ev_recommended_backends (); 1862 flags |= ev_recommended_backends ();
1658 1863
1864#if EV_USE_IOCP
1865 if (!backend && (flags & EVBACKEND_IOCP )) backend = iocp_init (EV_A_ flags);
1866#endif
1659#if EV_USE_PORT 1867#if EV_USE_PORT
1660 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags); 1868 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
1661#endif 1869#endif
1662#if EV_USE_KQUEUE 1870#if EV_USE_KQUEUE
1663 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags); 1871 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
1680#endif 1888#endif
1681 } 1889 }
1682} 1890}
1683 1891
1684/* free up a loop structure */ 1892/* free up a loop structure */
1685static void noinline 1893void ecb_cold
1686loop_destroy (EV_P) 1894ev_loop_destroy (EV_P)
1687{ 1895{
1688 int i; 1896 int i;
1897
1898#if EV_MULTIPLICITY
1899 /* mimic free (0) */
1900 if (!EV_A)
1901 return;
1902#endif
1903
1904#if EV_CLEANUP_ENABLE
1905 /* queue cleanup watchers (and execute them) */
1906 if (expect_false (cleanupcnt))
1907 {
1908 queue_events (EV_A_ (W *)cleanups, cleanupcnt, EV_CLEANUP);
1909 EV_INVOKE_PENDING;
1910 }
1911#endif
1912
1913#if EV_CHILD_ENABLE
1914 if (ev_is_active (&childev))
1915 {
1916 ev_ref (EV_A); /* child watcher */
1917 ev_signal_stop (EV_A_ &childev);
1918 }
1919#endif
1689 1920
1690 if (ev_is_active (&pipe_w)) 1921 if (ev_is_active (&pipe_w))
1691 { 1922 {
1692 /*ev_ref (EV_A);*/ 1923 /*ev_ref (EV_A);*/
1693 /*ev_io_stop (EV_A_ &pipe_w);*/ 1924 /*ev_io_stop (EV_A_ &pipe_w);*/
1715#endif 1946#endif
1716 1947
1717 if (backend_fd >= 0) 1948 if (backend_fd >= 0)
1718 close (backend_fd); 1949 close (backend_fd);
1719 1950
1951#if EV_USE_IOCP
1952 if (backend == EVBACKEND_IOCP ) iocp_destroy (EV_A);
1953#endif
1720#if EV_USE_PORT 1954#if EV_USE_PORT
1721 if (backend == EVBACKEND_PORT ) port_destroy (EV_A); 1955 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
1722#endif 1956#endif
1723#if EV_USE_KQUEUE 1957#if EV_USE_KQUEUE
1724 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A); 1958 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
1751 array_free (periodic, EMPTY); 1985 array_free (periodic, EMPTY);
1752#endif 1986#endif
1753#if EV_FORK_ENABLE 1987#if EV_FORK_ENABLE
1754 array_free (fork, EMPTY); 1988 array_free (fork, EMPTY);
1755#endif 1989#endif
1990#if EV_CLEANUP_ENABLE
1991 array_free (cleanup, EMPTY);
1992#endif
1756 array_free (prepare, EMPTY); 1993 array_free (prepare, EMPTY);
1757 array_free (check, EMPTY); 1994 array_free (check, EMPTY);
1758#if EV_ASYNC_ENABLE 1995#if EV_ASYNC_ENABLE
1759 array_free (async, EMPTY); 1996 array_free (async, EMPTY);
1760#endif 1997#endif
1761 1998
1762 backend = 0; 1999 backend = 0;
2000
2001#if EV_MULTIPLICITY
2002 if (ev_is_default_loop (EV_A))
2003#endif
2004 ev_default_loop_ptr = 0;
2005#if EV_MULTIPLICITY
2006 else
2007 ev_free (EV_A);
2008#endif
1763} 2009}
1764 2010
1765#if EV_USE_INOTIFY 2011#if EV_USE_INOTIFY
1766inline_size void infy_fork (EV_P); 2012inline_size void infy_fork (EV_P);
1767#endif 2013#endif
1782 infy_fork (EV_A); 2028 infy_fork (EV_A);
1783#endif 2029#endif
1784 2030
1785 if (ev_is_active (&pipe_w)) 2031 if (ev_is_active (&pipe_w))
1786 { 2032 {
1787 /* this "locks" the handlers against writing to the pipe */ 2033 /* pipe_write_wanted must be false now, so modifying fd vars should be safe */
1788 /* while we modify the fd vars */
1789 sig_pending = 1;
1790#if EV_ASYNC_ENABLE
1791 async_pending = 1;
1792#endif
1793 2034
1794 ev_ref (EV_A); 2035 ev_ref (EV_A);
1795 ev_io_stop (EV_A_ &pipe_w); 2036 ev_io_stop (EV_A_ &pipe_w);
1796 2037
1797#if EV_USE_EVENTFD 2038#if EV_USE_EVENTFD
1815 postfork = 0; 2056 postfork = 0;
1816} 2057}
1817 2058
1818#if EV_MULTIPLICITY 2059#if EV_MULTIPLICITY
1819 2060
1820struct ev_loop * 2061struct ev_loop * ecb_cold
1821ev_loop_new (unsigned int flags) 2062ev_loop_new (unsigned int flags)
1822{ 2063{
1823 EV_P = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop)); 2064 EV_P = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
1824 2065
1825 memset (EV_A, 0, sizeof (struct ev_loop)); 2066 memset (EV_A, 0, sizeof (struct ev_loop));
1826 loop_init (EV_A_ flags); 2067 loop_init (EV_A_ flags);
1827 2068
1828 if (ev_backend (EV_A)) 2069 if (ev_backend (EV_A))
1829 return EV_A; 2070 return EV_A;
1830 2071
2072 ev_free (EV_A);
1831 return 0; 2073 return 0;
1832} 2074}
1833 2075
1834void
1835ev_loop_destroy (EV_P)
1836{
1837 loop_destroy (EV_A);
1838 ev_free (loop);
1839}
1840
1841void
1842ev_loop_fork (EV_P)
1843{
1844 postfork = 1; /* must be in line with ev_default_fork */
1845}
1846#endif /* multiplicity */ 2076#endif /* multiplicity */
1847 2077
1848#if EV_VERIFY 2078#if EV_VERIFY
1849static void noinline 2079static void noinline ecb_cold
1850verify_watcher (EV_P_ W w) 2080verify_watcher (EV_P_ W w)
1851{ 2081{
1852 assert (("libev: watcher has invalid priority", ABSPRI (w) >= 0 && ABSPRI (w) < NUMPRI)); 2082 assert (("libev: watcher has invalid priority", ABSPRI (w) >= 0 && ABSPRI (w) < NUMPRI));
1853 2083
1854 if (w->pending) 2084 if (w->pending)
1855 assert (("libev: pending watcher not on pending queue", pendings [ABSPRI (w)][w->pending - 1].w == w)); 2085 assert (("libev: pending watcher not on pending queue", pendings [ABSPRI (w)][w->pending - 1].w == w));
1856} 2086}
1857 2087
1858static void noinline 2088static void noinline ecb_cold
1859verify_heap (EV_P_ ANHE *heap, int N) 2089verify_heap (EV_P_ ANHE *heap, int N)
1860{ 2090{
1861 int i; 2091 int i;
1862 2092
1863 for (i = HEAP0; i < N + HEAP0; ++i) 2093 for (i = HEAP0; i < N + HEAP0; ++i)
1868 2098
1869 verify_watcher (EV_A_ (W)ANHE_w (heap [i])); 2099 verify_watcher (EV_A_ (W)ANHE_w (heap [i]));
1870 } 2100 }
1871} 2101}
1872 2102
1873static void noinline 2103static void noinline ecb_cold
1874array_verify (EV_P_ W *ws, int cnt) 2104array_verify (EV_P_ W *ws, int cnt)
1875{ 2105{
1876 while (cnt--) 2106 while (cnt--)
1877 { 2107 {
1878 assert (("libev: active index mismatch", ev_active (ws [cnt]) == cnt + 1)); 2108 assert (("libev: active index mismatch", ev_active (ws [cnt]) == cnt + 1));
1880 } 2110 }
1881} 2111}
1882#endif 2112#endif
1883 2113
1884#if EV_FEATURE_API 2114#if EV_FEATURE_API
1885void 2115void ecb_cold
1886ev_verify (EV_P) 2116ev_verify (EV_P)
1887{ 2117{
1888#if EV_VERIFY 2118#if EV_VERIFY
1889 int i; 2119 int i;
1890 WL w; 2120 WL w;
1925#if EV_FORK_ENABLE 2155#if EV_FORK_ENABLE
1926 assert (forkmax >= forkcnt); 2156 assert (forkmax >= forkcnt);
1927 array_verify (EV_A_ (W *)forks, forkcnt); 2157 array_verify (EV_A_ (W *)forks, forkcnt);
1928#endif 2158#endif
1929 2159
2160#if EV_CLEANUP_ENABLE
2161 assert (cleanupmax >= cleanupcnt);
2162 array_verify (EV_A_ (W *)cleanups, cleanupcnt);
2163#endif
2164
1930#if EV_ASYNC_ENABLE 2165#if EV_ASYNC_ENABLE
1931 assert (asyncmax >= asynccnt); 2166 assert (asyncmax >= asynccnt);
1932 array_verify (EV_A_ (W *)asyncs, asynccnt); 2167 array_verify (EV_A_ (W *)asyncs, asynccnt);
1933#endif 2168#endif
1934 2169
1951#endif 2186#endif
1952} 2187}
1953#endif 2188#endif
1954 2189
1955#if EV_MULTIPLICITY 2190#if EV_MULTIPLICITY
1956struct ev_loop * 2191struct ev_loop * ecb_cold
1957ev_default_loop_init (unsigned int flags)
1958#else 2192#else
1959int 2193int
2194#endif
1960ev_default_loop (unsigned int flags) 2195ev_default_loop (unsigned int flags)
1961#endif
1962{ 2196{
1963 if (!ev_default_loop_ptr) 2197 if (!ev_default_loop_ptr)
1964 { 2198 {
1965#if EV_MULTIPLICITY 2199#if EV_MULTIPLICITY
1966 EV_P = ev_default_loop_ptr = &default_loop_struct; 2200 EV_P = ev_default_loop_ptr = &default_loop_struct;
1985 2219
1986 return ev_default_loop_ptr; 2220 return ev_default_loop_ptr;
1987} 2221}
1988 2222
1989void 2223void
1990ev_default_destroy (void) 2224ev_loop_fork (EV_P)
1991{ 2225{
1992#if EV_MULTIPLICITY
1993 EV_P = ev_default_loop_ptr;
1994#endif
1995
1996 ev_default_loop_ptr = 0;
1997
1998#if EV_CHILD_ENABLE
1999 ev_ref (EV_A); /* child watcher */
2000 ev_signal_stop (EV_A_ &childev);
2001#endif
2002
2003 loop_destroy (EV_A);
2004}
2005
2006void
2007ev_default_fork (void)
2008{
2009#if EV_MULTIPLICITY
2010 EV_P = ev_default_loop_ptr;
2011#endif
2012
2013 postfork = 1; /* must be in line with ev_loop_fork */ 2226 postfork = 1; /* must be in line with ev_default_fork */
2014} 2227}
2015 2228
2016/*****************************************************************************/ 2229/*****************************************************************************/
2017 2230
2018void 2231void
2040 2253
2041 for (pri = NUMPRI; pri--; ) 2254 for (pri = NUMPRI; pri--; )
2042 while (pendingcnt [pri]) 2255 while (pendingcnt [pri])
2043 { 2256 {
2044 ANPENDING *p = pendings [pri] + --pendingcnt [pri]; 2257 ANPENDING *p = pendings [pri] + --pendingcnt [pri];
2045
2046 /*assert (("libev: non-pending watcher on pending list", p->w->pending));*/
2047 /* ^ this is no longer true, as pending_w could be here */
2048 2258
2049 p->w->pending = 0; 2259 p->w->pending = 0;
2050 EV_CB_INVOKE (p->w, p->events); 2260 EV_CB_INVOKE (p->w, p->events);
2051 EV_FREQUENT_CHECK; 2261 EV_FREQUENT_CHECK;
2052 } 2262 }
2114 feed_reverse_done (EV_A_ EV_TIMER); 2324 feed_reverse_done (EV_A_ EV_TIMER);
2115 } 2325 }
2116} 2326}
2117 2327
2118#if EV_PERIODIC_ENABLE 2328#if EV_PERIODIC_ENABLE
2329
2330static void noinline
2331periodic_recalc (EV_P_ ev_periodic *w)
2332{
2333 ev_tstamp interval = w->interval > MIN_INTERVAL ? w->interval : MIN_INTERVAL;
2334 ev_tstamp at = w->offset + interval * ev_floor ((ev_rt_now - w->offset) / interval);
2335
2336 /* the above almost always errs on the low side */
2337 while (at <= ev_rt_now)
2338 {
2339 ev_tstamp nat = at + w->interval;
2340
2341 /* when resolution fails us, we use ev_rt_now */
2342 if (expect_false (nat == at))
2343 {
2344 at = ev_rt_now;
2345 break;
2346 }
2347
2348 at = nat;
2349 }
2350
2351 ev_at (w) = at;
2352}
2353
2119/* make periodics pending */ 2354/* make periodics pending */
2120inline_size void 2355inline_size void
2121periodics_reify (EV_P) 2356periodics_reify (EV_P)
2122{ 2357{
2123 EV_FREQUENT_CHECK; 2358 EV_FREQUENT_CHECK;
2142 ANHE_at_cache (periodics [HEAP0]); 2377 ANHE_at_cache (periodics [HEAP0]);
2143 downheap (periodics, periodiccnt, HEAP0); 2378 downheap (periodics, periodiccnt, HEAP0);
2144 } 2379 }
2145 else if (w->interval) 2380 else if (w->interval)
2146 { 2381 {
2147 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval; 2382 periodic_recalc (EV_A_ w);
2148 /* if next trigger time is not sufficiently in the future, put it there */
2149 /* this might happen because of floating point inexactness */
2150 if (ev_at (w) - ev_rt_now < TIME_EPSILON)
2151 {
2152 ev_at (w) += w->interval;
2153
2154 /* if interval is unreasonably low we might still have a time in the past */
2155 /* so correct this. this will make the periodic very inexact, but the user */
2156 /* has effectively asked to get triggered more often than possible */
2157 if (ev_at (w) < ev_rt_now)
2158 ev_at (w) = ev_rt_now;
2159 }
2160
2161 ANHE_at_cache (periodics [HEAP0]); 2383 ANHE_at_cache (periodics [HEAP0]);
2162 downheap (periodics, periodiccnt, HEAP0); 2384 downheap (periodics, periodiccnt, HEAP0);
2163 } 2385 }
2164 else 2386 else
2165 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */ 2387 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
2173 } 2395 }
2174} 2396}
2175 2397
2176/* simply recalculate all periodics */ 2398/* simply recalculate all periodics */
2177/* TODO: maybe ensure that at least one event happens when jumping forward? */ 2399/* TODO: maybe ensure that at least one event happens when jumping forward? */
2178static void noinline 2400static void noinline ecb_cold
2179periodics_reschedule (EV_P) 2401periodics_reschedule (EV_P)
2180{ 2402{
2181 int i; 2403 int i;
2182 2404
2183 /* adjust periodics after time jump */ 2405 /* adjust periodics after time jump */
2186 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [i]); 2408 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [i]);
2187 2409
2188 if (w->reschedule_cb) 2410 if (w->reschedule_cb)
2189 ev_at (w) = w->reschedule_cb (w, ev_rt_now); 2411 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2190 else if (w->interval) 2412 else if (w->interval)
2191 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval; 2413 periodic_recalc (EV_A_ w);
2192 2414
2193 ANHE_at_cache (periodics [i]); 2415 ANHE_at_cache (periodics [i]);
2194 } 2416 }
2195 2417
2196 reheap (periodics, periodiccnt); 2418 reheap (periodics, periodiccnt);
2197} 2419}
2198#endif 2420#endif
2199 2421
2200/* adjust all timers by a given offset */ 2422/* adjust all timers by a given offset */
2201static void noinline 2423static void noinline ecb_cold
2202timers_reschedule (EV_P_ ev_tstamp adjust) 2424timers_reschedule (EV_P_ ev_tstamp adjust)
2203{ 2425{
2204 int i; 2426 int i;
2205 2427
2206 for (i = 0; i < timercnt; ++i) 2428 for (i = 0; i < timercnt; ++i)
2243 * doesn't hurt either as we only do this on time-jumps or 2465 * doesn't hurt either as we only do this on time-jumps or
2244 * in the unlikely event of having been preempted here. 2466 * in the unlikely event of having been preempted here.
2245 */ 2467 */
2246 for (i = 4; --i; ) 2468 for (i = 4; --i; )
2247 { 2469 {
2470 ev_tstamp diff;
2248 rtmn_diff = ev_rt_now - mn_now; 2471 rtmn_diff = ev_rt_now - mn_now;
2249 2472
2473 diff = odiff - rtmn_diff;
2474
2250 if (expect_true (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)) 2475 if (expect_true ((diff < 0. ? -diff : diff) < MIN_TIMEJUMP))
2251 return; /* all is well */ 2476 return; /* all is well */
2252 2477
2253 ev_rt_now = ev_time (); 2478 ev_rt_now = ev_time ();
2254 mn_now = get_clock (); 2479 mn_now = get_clock ();
2255 now_floor = mn_now; 2480 now_floor = mn_now;
2345 ev_tstamp prev_mn_now = mn_now; 2570 ev_tstamp prev_mn_now = mn_now;
2346 2571
2347 /* update time to cancel out callback processing overhead */ 2572 /* update time to cancel out callback processing overhead */
2348 time_update (EV_A_ 1e100); 2573 time_update (EV_A_ 1e100);
2349 2574
2575 /* from now on, we want a pipe-wake-up */
2576 pipe_write_wanted = 1;
2577
2350 if (expect_true (!(flags & EVRUN_NOWAIT || idleall || !activecnt))) 2578 if (expect_true (!(flags & EVRUN_NOWAIT || idleall || !activecnt || pipe_write_skipped)))
2351 { 2579 {
2352 waittime = MAX_BLOCKTIME; 2580 waittime = MAX_BLOCKTIME;
2353 2581
2354 if (timercnt) 2582 if (timercnt)
2355 { 2583 {
2356 ev_tstamp to = ANHE_at (timers [HEAP0]) - mn_now + backend_fudge; 2584 ev_tstamp to = ANHE_at (timers [HEAP0]) - mn_now;
2357 if (waittime > to) waittime = to; 2585 if (waittime > to) waittime = to;
2358 } 2586 }
2359 2587
2360#if EV_PERIODIC_ENABLE 2588#if EV_PERIODIC_ENABLE
2361 if (periodiccnt) 2589 if (periodiccnt)
2362 { 2590 {
2363 ev_tstamp to = ANHE_at (periodics [HEAP0]) - ev_rt_now + backend_fudge; 2591 ev_tstamp to = ANHE_at (periodics [HEAP0]) - ev_rt_now;
2364 if (waittime > to) waittime = to; 2592 if (waittime > to) waittime = to;
2365 } 2593 }
2366#endif 2594#endif
2367 2595
2368 /* don't let timeouts decrease the waittime below timeout_blocktime */ 2596 /* don't let timeouts decrease the waittime below timeout_blocktime */
2369 if (expect_false (waittime < timeout_blocktime)) 2597 if (expect_false (waittime < timeout_blocktime))
2370 waittime = timeout_blocktime; 2598 waittime = timeout_blocktime;
2599
2600 /* at this point, we NEED to wait, so we have to ensure */
2601 /* to pass a minimum nonzero value to the backend */
2602 if (expect_false (waittime < backend_mintime))
2603 waittime = backend_mintime;
2371 2604
2372 /* extra check because io_blocktime is commonly 0 */ 2605 /* extra check because io_blocktime is commonly 0 */
2373 if (expect_false (io_blocktime)) 2606 if (expect_false (io_blocktime))
2374 { 2607 {
2375 sleeptime = io_blocktime - (mn_now - prev_mn_now); 2608 sleeptime = io_blocktime - (mn_now - prev_mn_now);
2376 2609
2377 if (sleeptime > waittime - backend_fudge) 2610 if (sleeptime > waittime - backend_mintime)
2378 sleeptime = waittime - backend_fudge; 2611 sleeptime = waittime - backend_mintime;
2379 2612
2380 if (expect_true (sleeptime > 0.)) 2613 if (expect_true (sleeptime > 0.))
2381 { 2614 {
2382 ev_sleep (sleeptime); 2615 ev_sleep (sleeptime);
2383 waittime -= sleeptime; 2616 waittime -= sleeptime;
2389 ++loop_count; 2622 ++loop_count;
2390#endif 2623#endif
2391 assert ((loop_done = EVBREAK_RECURSE, 1)); /* assert for side effect */ 2624 assert ((loop_done = EVBREAK_RECURSE, 1)); /* assert for side effect */
2392 backend_poll (EV_A_ waittime); 2625 backend_poll (EV_A_ waittime);
2393 assert ((loop_done = EVBREAK_CANCEL, 1)); /* assert for side effect */ 2626 assert ((loop_done = EVBREAK_CANCEL, 1)); /* assert for side effect */
2627
2628 pipe_write_wanted = 0;
2629
2630 if (pipe_write_skipped)
2631 {
2632 assert (("libev: pipe_w not active, but pipe not written", ev_is_active (&pipe_w)));
2633 ev_feed_event (EV_A_ &pipe_w, EV_CUSTOM);
2634 }
2635
2394 2636
2395 /* update ev_rt_now, do magic */ 2637 /* update ev_rt_now, do magic */
2396 time_update (EV_A_ waittime + sleeptime); 2638 time_update (EV_A_ waittime + sleeptime);
2397 } 2639 }
2398 2640
2688 if (w->reschedule_cb) 2930 if (w->reschedule_cb)
2689 ev_at (w) = w->reschedule_cb (w, ev_rt_now); 2931 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2690 else if (w->interval) 2932 else if (w->interval)
2691 { 2933 {
2692 assert (("libev: ev_periodic_start called with negative interval value", w->interval >= 0.)); 2934 assert (("libev: ev_periodic_start called with negative interval value", w->interval >= 0.));
2693 /* this formula differs from the one in periodic_reify because we do not always round up */ 2935 periodic_recalc (EV_A_ w);
2694 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
2695 } 2936 }
2696 else 2937 else
2697 ev_at (w) = w->offset; 2938 ev_at (w) = w->offset;
2698 2939
2699 EV_FREQUENT_CHECK; 2940 EV_FREQUENT_CHECK;
2820 sa.sa_handler = ev_sighandler; 3061 sa.sa_handler = ev_sighandler;
2821 sigfillset (&sa.sa_mask); 3062 sigfillset (&sa.sa_mask);
2822 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */ 3063 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
2823 sigaction (w->signum, &sa, 0); 3064 sigaction (w->signum, &sa, 0);
2824 3065
3066 if (origflags & EVFLAG_NOSIGMASK)
3067 {
2825 sigemptyset (&sa.sa_mask); 3068 sigemptyset (&sa.sa_mask);
2826 sigaddset (&sa.sa_mask, w->signum); 3069 sigaddset (&sa.sa_mask, w->signum);
2827 sigprocmask (SIG_UNBLOCK, &sa.sa_mask, 0); 3070 sigprocmask (SIG_UNBLOCK, &sa.sa_mask, 0);
3071 }
2828#endif 3072#endif
2829 } 3073 }
2830 3074
2831 EV_FREQUENT_CHECK; 3075 EV_FREQUENT_CHECK;
2832} 3076}
2973 if (!pend || pend == path) 3217 if (!pend || pend == path)
2974 break; 3218 break;
2975 3219
2976 *pend = 0; 3220 *pend = 0;
2977 w->wd = inotify_add_watch (fs_fd, path, mask); 3221 w->wd = inotify_add_watch (fs_fd, path, mask);
2978 } 3222 }
2979 while (w->wd < 0 && (errno == ENOENT || errno == EACCES)); 3223 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
2980 } 3224 }
2981 } 3225 }
2982 3226
2983 if (w->wd >= 0) 3227 if (w->wd >= 0)
3050 infy_wd (EV_A_ ev->wd, ev->wd, ev); 3294 infy_wd (EV_A_ ev->wd, ev->wd, ev);
3051 ofs += sizeof (struct inotify_event) + ev->len; 3295 ofs += sizeof (struct inotify_event) + ev->len;
3052 } 3296 }
3053} 3297}
3054 3298
3055inline_size unsigned int
3056ev_linux_version (void)
3057{
3058 struct utsname buf;
3059 unsigned int v;
3060 int i;
3061 char *p = buf.release;
3062
3063 if (uname (&buf))
3064 return 0;
3065
3066 for (i = 3+1; --i; )
3067 {
3068 unsigned int c = 0;
3069
3070 for (;;)
3071 {
3072 if (*p >= '0' && *p <= '9')
3073 c = c * 10 + *p++ - '0';
3074 else
3075 {
3076 p += *p == '.';
3077 break;
3078 }
3079 }
3080
3081 v = (v << 8) | c;
3082 }
3083
3084 return v;
3085}
3086
3087inline_size void 3299inline_size void ecb_cold
3088ev_check_2625 (EV_P) 3300ev_check_2625 (EV_P)
3089{ 3301{
3090 /* kernels < 2.6.25 are borked 3302 /* kernels < 2.6.25 are borked
3091 * http://www.ussg.indiana.edu/hypermail/linux/kernel/0711.3/1208.html 3303 * http://www.ussg.indiana.edu/hypermail/linux/kernel/0711.3/1208.html
3092 */ 3304 */
3556 3768
3557 EV_FREQUENT_CHECK; 3769 EV_FREQUENT_CHECK;
3558} 3770}
3559#endif 3771#endif
3560 3772
3773#if EV_CLEANUP_ENABLE
3774void
3775ev_cleanup_start (EV_P_ ev_cleanup *w)
3776{
3777 if (expect_false (ev_is_active (w)))
3778 return;
3779
3780 EV_FREQUENT_CHECK;
3781
3782 ev_start (EV_A_ (W)w, ++cleanupcnt);
3783 array_needsize (ev_cleanup *, cleanups, cleanupmax, cleanupcnt, EMPTY2);
3784 cleanups [cleanupcnt - 1] = w;
3785
3786 /* cleanup watchers should never keep a refcount on the loop */
3787 ev_unref (EV_A);
3788 EV_FREQUENT_CHECK;
3789}
3790
3791void
3792ev_cleanup_stop (EV_P_ ev_cleanup *w)
3793{
3794 clear_pending (EV_A_ (W)w);
3795 if (expect_false (!ev_is_active (w)))
3796 return;
3797
3798 EV_FREQUENT_CHECK;
3799 ev_ref (EV_A);
3800
3801 {
3802 int active = ev_active (w);
3803
3804 cleanups [active - 1] = cleanups [--cleanupcnt];
3805 ev_active (cleanups [active - 1]) = active;
3806 }
3807
3808 ev_stop (EV_A_ (W)w);
3809
3810 EV_FREQUENT_CHECK;
3811}
3812#endif
3813
3561#if EV_ASYNC_ENABLE 3814#if EV_ASYNC_ENABLE
3562void 3815void
3563ev_async_start (EV_P_ ev_async *w) 3816ev_async_start (EV_P_ ev_async *w)
3564{ 3817{
3565 if (expect_false (ev_is_active (w))) 3818 if (expect_false (ev_is_active (w)))
3676} 3929}
3677 3930
3678/*****************************************************************************/ 3931/*****************************************************************************/
3679 3932
3680#if EV_WALK_ENABLE 3933#if EV_WALK_ENABLE
3681void 3934void ecb_cold
3682ev_walk (EV_P_ int types, void (*cb)(EV_P_ int type, void *w)) 3935ev_walk (EV_P_ int types, void (*cb)(EV_P_ int type, void *w))
3683{ 3936{
3684 int i, j; 3937 int i, j;
3685 ev_watcher_list *wl, *wn; 3938 ev_watcher_list *wl, *wn;
3686 3939

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