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Comparing libev/ev.c (file contents):
Revision 1.371 by root, Mon Feb 7 21:45:32 2011 UTC vs.
Revision 1.401 by root, Tue Dec 20 04:08:35 2011 UTC

4 * Copyright (c) 2007,2008,2009,2010,2011 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
177#ifdef EV_H 182#ifdef EV_H
178# include EV_H 183# include EV_H
179#else 184#else
180# include "ev.h" 185# include "ev.h"
181#endif 186#endif
182
183EV_CPP(extern "C" {)
184 187
185#ifndef _WIN32 188#ifndef _WIN32
186# include <sys/time.h> 189# include <sys/time.h>
187# include <sys/wait.h> 190# include <sys/wait.h>
188# include <unistd.h> 191# include <unistd.h>
232/* to make it compile regardless, just remove the above line, */ 235/* to make it compile regardless, just remove the above line, */
233/* but consider reporting it, too! :) */ 236/* but consider reporting it, too! :) */
234# define EV_NSIG 65 237# define EV_NSIG 65
235#endif 238#endif
236 239
240#ifndef EV_USE_FLOOR
241# define EV_USE_FLOOR 0
242#endif
243
237#ifndef EV_USE_CLOCK_SYSCALL 244#ifndef EV_USE_CLOCK_SYSCALL
238# if __linux && __GLIBC__ >= 2 245# if __linux && __GLIBC__ >= 2
239# define EV_USE_CLOCK_SYSCALL EV_FEATURE_OS 246# define EV_USE_CLOCK_SYSCALL EV_FEATURE_OS
240# else 247# else
241# define EV_USE_CLOCK_SYSCALL 0 248# define EV_USE_CLOCK_SYSCALL 0
443#else 450#else
444# define EV_FREQUENT_CHECK do { } while (0) 451# define EV_FREQUENT_CHECK do { } while (0)
445#endif 452#endif
446 453
447/* 454/*
448 * This is used to avoid floating point rounding problems. 455 * 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. 456 * This value is good at least till the year 4000.
453 * Better solutions welcome.
454 */ 457 */
455#define TIME_EPSILON 0.0001220703125 /* 1/8192 */ 458#define MIN_INTERVAL 0.0001220703125 /* 1/2**13, good till 4000 */
459/*#define MIN_INTERVAL 0.00000095367431640625 /* 1/2**20, good till 2200 */
456 460
457#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */ 461#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) */ 462#define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
459 463
460#define EV_TV_SET(tv,t) do { tv.tv_sec = (long)t; tv.tv_usec = (long)((t - tv.tv_sec) * 1e6); } while (0) 464#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) 465#define EV_TS_SET(ts,t) do { ts.tv_sec = (long)t; ts.tv_nsec = (long)((t - ts.tv_sec) * 1e9); } while (0)
462 466
467/* the following is ecb.h embedded into libev - use update_ev_c to update from an external copy */
468/* ECB.H BEGIN */
469/*
470 * libecb - http://software.schmorp.de/pkg/libecb
471 *
472 * Copyright (©) 2009-2011 Marc Alexander Lehmann <libecb@schmorp.de>
473 * Copyright (©) 2011 Emanuele Giaquinta
474 * All rights reserved.
475 *
476 * Redistribution and use in source and binary forms, with or without modifica-
477 * tion, are permitted provided that the following conditions are met:
478 *
479 * 1. Redistributions of source code must retain the above copyright notice,
480 * this list of conditions and the following disclaimer.
481 *
482 * 2. Redistributions in binary form must reproduce the above copyright
483 * notice, this list of conditions and the following disclaimer in the
484 * documentation and/or other materials provided with the distribution.
485 *
486 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
487 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
488 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
489 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
490 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
491 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
492 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
493 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
494 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
495 * OF THE POSSIBILITY OF SUCH DAMAGE.
496 */
497
498#ifndef ECB_H
499#define ECB_H
500
501#ifdef _WIN32
502 typedef signed char int8_t;
503 typedef unsigned char uint8_t;
504 typedef signed short int16_t;
505 typedef unsigned short uint16_t;
506 typedef signed int int32_t;
507 typedef unsigned int uint32_t;
463#if __GNUC__ >= 4 508 #if __GNUC__
464# define expect(expr,value) __builtin_expect ((expr),(value)) 509 typedef signed long long int64_t;
465# define noinline __attribute__ ((noinline)) 510 typedef unsigned long long uint64_t;
511 #else /* _MSC_VER || __BORLANDC__ */
512 typedef signed __int64 int64_t;
513 typedef unsigned __int64 uint64_t;
514 #endif
466#else 515#else
467# define expect(expr,value) (expr) 516 #include <inttypes.h>
468# define noinline
469# if __STDC_VERSION__ < 199901L && __GNUC__ < 2
470# define inline
471# endif 517#endif
518
519/* many compilers define _GNUC_ to some versions but then only implement
520 * what their idiot authors think are the "more important" extensions,
521 * causing enormous grief in return for some better fake benchmark numbers.
522 * or so.
523 * we try to detect these and simply assume they are not gcc - if they have
524 * an issue with that they should have done it right in the first place.
525 */
526#ifndef ECB_GCC_VERSION
527 #if !defined(__GNUC_MINOR__) || defined(__INTEL_COMPILER) || defined(__SUNPRO_C) || defined(__SUNPRO_CC) || defined(__llvm__) || defined(__clang__)
528 #define ECB_GCC_VERSION(major,minor) 0
529 #else
530 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
472#endif 531 #endif
532#endif
473 533
534/*****************************************************************************/
535
536/* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
537/* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
538
539#if ECB_NO_THREADS || ECB_NO_SMP
540 #define ECB_MEMORY_FENCE do { } while (0)
541#endif
542
543#ifndef ECB_MEMORY_FENCE
544 #if ECB_GCC_VERSION(2,5) || defined(__INTEL_COMPILER) || defined(__clang__)
545 #if __i386__
546 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
547 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE /* non-lock xchg might be enough */
548 #define ECB_MEMORY_FENCE_RELEASE do { } while (0) /* unlikely to change in future cpus */
549 #elif __amd64
550 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
551 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("lfence" : : : "memory")
552 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("sfence") /* play safe - not needed in any current cpu */
553 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
554 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
555 #elif defined(__ARM_ARCH_6__ ) || defined(__ARM_ARCH_6J__ ) \
556 || defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6ZK__)
557 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
558 #elif defined(__ARM_ARCH_7__ ) || defined(__ARM_ARCH_7A__ ) \
559 || defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7R__ )
560 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
561 #endif
562 #endif
563#endif
564
565#ifndef ECB_MEMORY_FENCE
566 #if ECB_GCC_VERSION(4,4) || defined(__INTEL_COMPILER) || defined(__clang__)
567 #define ECB_MEMORY_FENCE __sync_synchronize ()
568 /*#define ECB_MEMORY_FENCE_ACQUIRE ({ char dummy = 0; __sync_lock_test_and_set (&dummy, 1); }) */
569 /*#define ECB_MEMORY_FENCE_RELEASE ({ char dummy = 1; __sync_lock_release (&dummy ); }) */
570 #elif _MSC_VER >= 1400 /* VC++ 2005 */
571 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
572 #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
573 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
574 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
575 #elif defined(_WIN32)
576 #include <WinNT.h>
577 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
578 #endif
579#endif
580
581#ifndef ECB_MEMORY_FENCE
582 #if !ECB_AVOID_PTHREADS
583 /*
584 * if you get undefined symbol references to pthread_mutex_lock,
585 * or failure to find pthread.h, then you should implement
586 * the ECB_MEMORY_FENCE operations for your cpu/compiler
587 * OR provide pthread.h and link against the posix thread library
588 * of your system.
589 */
590 #include <pthread.h>
591 #define ECB_NEEDS_PTHREADS 1
592 #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
593
594 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
595 #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
596 #endif
597#endif
598
599#if !defined(ECB_MEMORY_FENCE_ACQUIRE) && defined(ECB_MEMORY_FENCE)
600 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
601#endif
602
603#if !defined(ECB_MEMORY_FENCE_RELEASE) && defined(ECB_MEMORY_FENCE)
604 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
605#endif
606
607/*****************************************************************************/
608
609#define ECB_C99 (__STDC_VERSION__ >= 199901L)
610
611#if __cplusplus
612 #define ecb_inline static inline
613#elif ECB_GCC_VERSION(2,5)
614 #define ecb_inline static __inline__
615#elif ECB_C99
616 #define ecb_inline static inline
617#else
618 #define ecb_inline static
619#endif
620
621#if ECB_GCC_VERSION(3,3)
622 #define ecb_restrict __restrict__
623#elif ECB_C99
624 #define ecb_restrict restrict
625#else
626 #define ecb_restrict
627#endif
628
629typedef int ecb_bool;
630
631#define ECB_CONCAT_(a, b) a ## b
632#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
633#define ECB_STRINGIFY_(a) # a
634#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
635
636#define ecb_function_ ecb_inline
637
638#if ECB_GCC_VERSION(3,1)
639 #define ecb_attribute(attrlist) __attribute__(attrlist)
640 #define ecb_is_constant(expr) __builtin_constant_p (expr)
641 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
642 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
643#else
644 #define ecb_attribute(attrlist)
645 #define ecb_is_constant(expr) 0
646 #define ecb_expect(expr,value) (expr)
647 #define ecb_prefetch(addr,rw,locality)
648#endif
649
650/* no emulation for ecb_decltype */
651#if ECB_GCC_VERSION(4,5)
652 #define ecb_decltype(x) __decltype(x)
653#elif ECB_GCC_VERSION(3,0)
654 #define ecb_decltype(x) __typeof(x)
655#endif
656
657#define ecb_noinline ecb_attribute ((__noinline__))
658#define ecb_noreturn ecb_attribute ((__noreturn__))
659#define ecb_unused ecb_attribute ((__unused__))
660#define ecb_const ecb_attribute ((__const__))
661#define ecb_pure ecb_attribute ((__pure__))
662
663#if ECB_GCC_VERSION(4,3)
664 #define ecb_artificial ecb_attribute ((__artificial__))
665 #define ecb_hot ecb_attribute ((__hot__))
666 #define ecb_cold ecb_attribute ((__cold__))
667#else
668 #define ecb_artificial
669 #define ecb_hot
670 #define ecb_cold
671#endif
672
673/* put around conditional expressions if you are very sure that the */
674/* expression is mostly true or mostly false. note that these return */
675/* booleans, not the expression. */
474#define expect_false(expr) expect ((expr) != 0, 0) 676#define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
475#define expect_true(expr) expect ((expr) != 0, 1) 677#define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
678/* for compatibility to the rest of the world */
679#define ecb_likely(expr) ecb_expect_true (expr)
680#define ecb_unlikely(expr) ecb_expect_false (expr)
681
682/* count trailing zero bits and count # of one bits */
683#if ECB_GCC_VERSION(3,4)
684 /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
685 #define ecb_ld32(x) (__builtin_clz (x) ^ 31)
686 #define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
687 #define ecb_ctz32(x) __builtin_ctz (x)
688 #define ecb_ctz64(x) __builtin_ctzll (x)
689 #define ecb_popcount32(x) __builtin_popcount (x)
690 /* no popcountll */
691#else
692 ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const;
693 ecb_function_ int
694 ecb_ctz32 (uint32_t x)
695 {
696 int r = 0;
697
698 x &= ~x + 1; /* this isolates the lowest bit */
699
700#if ECB_branchless_on_i386
701 r += !!(x & 0xaaaaaaaa) << 0;
702 r += !!(x & 0xcccccccc) << 1;
703 r += !!(x & 0xf0f0f0f0) << 2;
704 r += !!(x & 0xff00ff00) << 3;
705 r += !!(x & 0xffff0000) << 4;
706#else
707 if (x & 0xaaaaaaaa) r += 1;
708 if (x & 0xcccccccc) r += 2;
709 if (x & 0xf0f0f0f0) r += 4;
710 if (x & 0xff00ff00) r += 8;
711 if (x & 0xffff0000) r += 16;
712#endif
713
714 return r;
715 }
716
717 ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const;
718 ecb_function_ int
719 ecb_ctz64 (uint64_t x)
720 {
721 int shift = x & 0xffffffffU ? 0 : 32;
722 return ecb_ctz32 (x >> shift) + shift;
723 }
724
725 ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const;
726 ecb_function_ int
727 ecb_popcount32 (uint32_t x)
728 {
729 x -= (x >> 1) & 0x55555555;
730 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
731 x = ((x >> 4) + x) & 0x0f0f0f0f;
732 x *= 0x01010101;
733
734 return x >> 24;
735 }
736
737 ecb_function_ int ecb_ld32 (uint32_t x) ecb_const;
738 ecb_function_ int ecb_ld32 (uint32_t x)
739 {
740 int r = 0;
741
742 if (x >> 16) { x >>= 16; r += 16; }
743 if (x >> 8) { x >>= 8; r += 8; }
744 if (x >> 4) { x >>= 4; r += 4; }
745 if (x >> 2) { x >>= 2; r += 2; }
746 if (x >> 1) { r += 1; }
747
748 return r;
749 }
750
751 ecb_function_ int ecb_ld64 (uint64_t x) ecb_const;
752 ecb_function_ int ecb_ld64 (uint64_t x)
753 {
754 int r = 0;
755
756 if (x >> 32) { x >>= 32; r += 32; }
757
758 return r + ecb_ld32 (x);
759 }
760#endif
761
762/* popcount64 is only available on 64 bit cpus as gcc builtin */
763/* so for this version we are lazy */
764ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;
765ecb_function_ int
766ecb_popcount64 (uint64_t x)
767{
768 return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
769}
770
771ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const;
772ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const;
773ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const;
774ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const;
775ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
776ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
777ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const;
778ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const;
779
780ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }
781ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }
782ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }
783ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }
784ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
785ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
786ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
787ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }
788
789#if ECB_GCC_VERSION(4,3)
790 #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
791 #define ecb_bswap32(x) __builtin_bswap32 (x)
792 #define ecb_bswap64(x) __builtin_bswap64 (x)
793#else
794 ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const;
795 ecb_function_ uint16_t
796 ecb_bswap16 (uint16_t x)
797 {
798 return ecb_rotl16 (x, 8);
799 }
800
801 ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const;
802 ecb_function_ uint32_t
803 ecb_bswap32 (uint32_t x)
804 {
805 return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
806 }
807
808 ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const;
809 ecb_function_ uint64_t
810 ecb_bswap64 (uint64_t x)
811 {
812 return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
813 }
814#endif
815
816#if ECB_GCC_VERSION(4,5)
817 #define ecb_unreachable() __builtin_unreachable ()
818#else
819 /* this seems to work fine, but gcc always emits a warning for it :/ */
820 ecb_function_ void ecb_unreachable (void) ecb_noreturn;
821 ecb_function_ void ecb_unreachable (void) { }
822#endif
823
824/* try to tell the compiler that some condition is definitely true */
825#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
826
827ecb_function_ unsigned char ecb_byteorder_helper (void) ecb_const;
828ecb_function_ unsigned char
829ecb_byteorder_helper (void)
830{
831 const uint32_t u = 0x11223344;
832 return *(unsigned char *)&u;
833}
834
835ecb_function_ ecb_bool ecb_big_endian (void) ecb_const;
836ecb_function_ ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
837ecb_function_ ecb_bool ecb_little_endian (void) ecb_const;
838ecb_function_ ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
839
840#if ECB_GCC_VERSION(3,0) || ECB_C99
841 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
842#else
843 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
844#endif
845
846#if __cplusplus
847 template<typename T>
848 static inline T ecb_div_rd (T val, T div)
849 {
850 return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
851 }
852 template<typename T>
853 static inline T ecb_div_ru (T val, T div)
854 {
855 return val < 0 ? - ((-val ) / div) : (val + div - 1) / div;
856 }
857#else
858 #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
859 #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
860#endif
861
862#if ecb_cplusplus_does_not_suck
863 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
864 template<typename T, int N>
865 static inline int ecb_array_length (const T (&arr)[N])
866 {
867 return N;
868 }
869#else
870 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
871#endif
872
873#endif
874
875/* ECB.H END */
876
877#if ECB_MEMORY_FENCE_NEEDS_PTHREADS
878/* if your architecture doesn't need memory fences, e.g. because it is
879 * single-cpu/core, or if you use libev in a project that doesn't use libev
880 * from multiple threads, then you can define ECB_AVOID_PTHREADS when compiling
881 * libev, in which casess the memory fences become nops.
882 * alternatively, you can remove this #error and link against libpthread,
883 * which will then provide the memory fences.
884 */
885# error "memory fences not defined for your architecture, please report"
886#endif
887
888#ifndef ECB_MEMORY_FENCE
889# define ECB_MEMORY_FENCE do { } while (0)
890# define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
891# define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
892#endif
893
894#define expect_false(cond) ecb_expect_false (cond)
895#define expect_true(cond) ecb_expect_true (cond)
896#define noinline ecb_noinline
897
476#define inline_size static inline 898#define inline_size ecb_inline
477 899
478#if EV_FEATURE_CODE 900#if EV_FEATURE_CODE
479# define inline_speed static inline 901# define inline_speed ecb_inline
480#else 902#else
481# define inline_speed static noinline 903# define inline_speed static noinline
482#endif 904#endif
483 905
484#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1) 906#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
523# include "ev_win32.c" 945# include "ev_win32.c"
524#endif 946#endif
525 947
526/*****************************************************************************/ 948/*****************************************************************************/
527 949
950/* define a suitable floor function (only used by periodics atm) */
951
952#if EV_USE_FLOOR
953# include <math.h>
954# define ev_floor(v) floor (v)
955#else
956
957#include <float.h>
958
959/* a floor() replacement function, should be independent of ev_tstamp type */
960static ev_tstamp noinline
961ev_floor (ev_tstamp v)
962{
963 /* the choice of shift factor is not terribly important */
964#if FLT_RADIX != 2 /* assume FLT_RADIX == 10 */
965 const ev_tstamp shift = sizeof (unsigned long) >= 8 ? 10000000000000000000. : 1000000000.;
966#else
967 const ev_tstamp shift = sizeof (unsigned long) >= 8 ? 18446744073709551616. : 4294967296.;
968#endif
969
970 /* argument too large for an unsigned long? */
971 if (expect_false (v >= shift))
972 {
973 ev_tstamp f;
974
975 if (v == v - 1.)
976 return v; /* very large number */
977
978 f = shift * ev_floor (v * (1. / shift));
979 return f + ev_floor (v - f);
980 }
981
982 /* special treatment for negative args? */
983 if (expect_false (v < 0.))
984 {
985 ev_tstamp f = -ev_floor (-v);
986
987 return f - (f == v ? 0 : 1);
988 }
989
990 /* fits into an unsigned long */
991 return (unsigned long)v;
992}
993
994#endif
995
996/*****************************************************************************/
997
528#ifdef __linux 998#ifdef __linux
529# include <sys/utsname.h> 999# include <sys/utsname.h>
530#endif 1000#endif
531 1001
532static unsigned int noinline 1002static unsigned int noinline ecb_cold
533ev_linux_version (void) 1003ev_linux_version (void)
534{ 1004{
535#ifdef __linux 1005#ifdef __linux
536 unsigned int v = 0; 1006 unsigned int v = 0;
537 struct utsname buf; 1007 struct utsname buf;
566} 1036}
567 1037
568/*****************************************************************************/ 1038/*****************************************************************************/
569 1039
570#if EV_AVOID_STDIO 1040#if EV_AVOID_STDIO
571static void noinline 1041static void noinline ecb_cold
572ev_printerr (const char *msg) 1042ev_printerr (const char *msg)
573{ 1043{
574 write (STDERR_FILENO, msg, strlen (msg)); 1044 write (STDERR_FILENO, msg, strlen (msg));
575} 1045}
576#endif 1046#endif
577 1047
578static void (*syserr_cb)(const char *msg); 1048static void (*syserr_cb)(const char *msg);
579 1049
580void 1050void ecb_cold
581ev_set_syserr_cb (void (*cb)(const char *msg)) 1051ev_set_syserr_cb (void (*cb)(const char *msg))
582{ 1052{
583 syserr_cb = cb; 1053 syserr_cb = cb;
584} 1054}
585 1055
586static void noinline 1056static void noinline ecb_cold
587ev_syserr (const char *msg) 1057ev_syserr (const char *msg)
588{ 1058{
589 if (!msg) 1059 if (!msg)
590 msg = "(libev) system error"; 1060 msg = "(libev) system error";
591 1061
624#endif 1094#endif
625} 1095}
626 1096
627static void *(*alloc)(void *ptr, long size) = ev_realloc_emul; 1097static void *(*alloc)(void *ptr, long size) = ev_realloc_emul;
628 1098
629void 1099void ecb_cold
630ev_set_allocator (void *(*cb)(void *ptr, long size)) 1100ev_set_allocator (void *(*cb)(void *ptr, long size))
631{ 1101{
632 alloc = cb; 1102 alloc = cb;
633} 1103}
634 1104
723 #undef VAR 1193 #undef VAR
724 }; 1194 };
725 #include "ev_wrap.h" 1195 #include "ev_wrap.h"
726 1196
727 static struct ev_loop default_loop_struct; 1197 static struct ev_loop default_loop_struct;
728 struct ev_loop *ev_default_loop_ptr; 1198 EV_API_DECL struct ev_loop *ev_default_loop_ptr = 0; /* needs to be initialised to make it a defintiino despite extern */
729 1199
730#else 1200#else
731 1201
732 ev_tstamp ev_rt_now; 1202 EV_API_DECL ev_tstamp ev_rt_now = 0; /* needs to be initialised to make it a defintiino despite extern */
733 #define VAR(name,decl) static decl; 1203 #define VAR(name,decl) static decl;
734 #include "ev_vars.h" 1204 #include "ev_vars.h"
735 #undef VAR 1205 #undef VAR
736 1206
737 static int ev_default_loop_ptr; 1207 static int ev_default_loop_ptr;
816 select (0, 0, 0, 0, &tv); 1286 select (0, 0, 0, 0, &tv);
817#endif 1287#endif
818 } 1288 }
819} 1289}
820 1290
821inline_speed int
822ev_timeout_to_ms (ev_tstamp timeout)
823{
824 int ms = timeout * 1000. + .999999;
825
826 return expect_true (ms) ? ms : timeout < 1e-6 ? 0 : 1;
827}
828
829/*****************************************************************************/ 1291/*****************************************************************************/
830 1292
831#define MALLOC_ROUND 4096 /* prefer to allocate in chunks of this size, must be 2**n and >> 4 longs */ 1293#define MALLOC_ROUND 4096 /* prefer to allocate in chunks of this size, must be 2**n and >> 4 longs */
832 1294
833/* find a suitable new size for the given array, */ 1295/* find a suitable new size for the given array, */
839 1301
840 do 1302 do
841 ncur <<= 1; 1303 ncur <<= 1;
842 while (cnt > ncur); 1304 while (cnt > ncur);
843 1305
844 /* if size is large, round to MALLOC_ROUND - 4 * longs to accomodate malloc overhead */ 1306 /* if size is large, round to MALLOC_ROUND - 4 * longs to accommodate malloc overhead */
845 if (elem * ncur > MALLOC_ROUND - sizeof (void *) * 4) 1307 if (elem * ncur > MALLOC_ROUND - sizeof (void *) * 4)
846 { 1308 {
847 ncur *= elem; 1309 ncur *= elem;
848 ncur = (ncur + elem + (MALLOC_ROUND - 1) + sizeof (void *) * 4) & ~(MALLOC_ROUND - 1); 1310 ncur = (ncur + elem + (MALLOC_ROUND - 1) + sizeof (void *) * 4) & ~(MALLOC_ROUND - 1);
849 ncur = ncur - sizeof (void *) * 4; 1311 ncur = ncur - sizeof (void *) * 4;
851 } 1313 }
852 1314
853 return ncur; 1315 return ncur;
854} 1316}
855 1317
856static noinline void * 1318static void * noinline ecb_cold
857array_realloc (int elem, void *base, int *cur, int cnt) 1319array_realloc (int elem, void *base, int *cur, int cnt)
858{ 1320{
859 *cur = array_nextsize (elem, *cur, cnt); 1321 *cur = array_nextsize (elem, *cur, cnt);
860 return ev_realloc (base, elem * *cur); 1322 return ev_realloc (base, elem * *cur);
861} 1323}
864 memset ((void *)(base), 0, sizeof (*(base)) * (count)) 1326 memset ((void *)(base), 0, sizeof (*(base)) * (count))
865 1327
866#define array_needsize(type,base,cur,cnt,init) \ 1328#define array_needsize(type,base,cur,cnt,init) \
867 if (expect_false ((cnt) > (cur))) \ 1329 if (expect_false ((cnt) > (cur))) \
868 { \ 1330 { \
869 int ocur_ = (cur); \ 1331 int ecb_unused ocur_ = (cur); \
870 (base) = (type *)array_realloc \ 1332 (base) = (type *)array_realloc \
871 (sizeof (type), (base), &(cur), (cnt)); \ 1333 (sizeof (type), (base), &(cur), (cnt)); \
872 init ((base) + (ocur_), (cur) - ocur_); \ 1334 init ((base) + (ocur_), (cur) - ocur_); \
873 } 1335 }
874 1336
980 for (i = 0; i < fdchangecnt; ++i) 1442 for (i = 0; i < fdchangecnt; ++i)
981 { 1443 {
982 int fd = fdchanges [i]; 1444 int fd = fdchanges [i];
983 ANFD *anfd = anfds + fd; 1445 ANFD *anfd = anfds + fd;
984 1446
985 if (anfd->reify & EV__IOFDSET) 1447 if (anfd->reify & EV__IOFDSET && anfd->head)
986 { 1448 {
987 SOCKET handle = EV_FD_TO_WIN32_HANDLE (fd); 1449 SOCKET handle = EV_FD_TO_WIN32_HANDLE (fd);
988 1450
989 if (handle != anfd->handle) 1451 if (handle != anfd->handle)
990 { 1452 {
1044 fdchanges [fdchangecnt - 1] = fd; 1506 fdchanges [fdchangecnt - 1] = fd;
1045 } 1507 }
1046} 1508}
1047 1509
1048/* the given fd is invalid/unusable, so make sure it doesn't hurt us anymore */ 1510/* the given fd is invalid/unusable, so make sure it doesn't hurt us anymore */
1049inline_speed void 1511inline_speed void ecb_cold
1050fd_kill (EV_P_ int fd) 1512fd_kill (EV_P_ int fd)
1051{ 1513{
1052 ev_io *w; 1514 ev_io *w;
1053 1515
1054 while ((w = (ev_io *)anfds [fd].head)) 1516 while ((w = (ev_io *)anfds [fd].head))
1057 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE); 1519 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
1058 } 1520 }
1059} 1521}
1060 1522
1061/* check whether the given fd is actually valid, for error recovery */ 1523/* check whether the given fd is actually valid, for error recovery */
1062inline_size int 1524inline_size int ecb_cold
1063fd_valid (int fd) 1525fd_valid (int fd)
1064{ 1526{
1065#ifdef _WIN32 1527#ifdef _WIN32
1066 return EV_FD_TO_WIN32_HANDLE (fd) != -1; 1528 return EV_FD_TO_WIN32_HANDLE (fd) != -1;
1067#else 1529#else
1068 return fcntl (fd, F_GETFD) != -1; 1530 return fcntl (fd, F_GETFD) != -1;
1069#endif 1531#endif
1070} 1532}
1071 1533
1072/* called on EBADF to verify fds */ 1534/* called on EBADF to verify fds */
1073static void noinline 1535static void noinline ecb_cold
1074fd_ebadf (EV_P) 1536fd_ebadf (EV_P)
1075{ 1537{
1076 int fd; 1538 int fd;
1077 1539
1078 for (fd = 0; fd < anfdmax; ++fd) 1540 for (fd = 0; fd < anfdmax; ++fd)
1080 if (!fd_valid (fd) && errno == EBADF) 1542 if (!fd_valid (fd) && errno == EBADF)
1081 fd_kill (EV_A_ fd); 1543 fd_kill (EV_A_ fd);
1082} 1544}
1083 1545
1084/* called on ENOMEM in select/poll to kill some fds and retry */ 1546/* called on ENOMEM in select/poll to kill some fds and retry */
1085static void noinline 1547static void noinline ecb_cold
1086fd_enomem (EV_P) 1548fd_enomem (EV_P)
1087{ 1549{
1088 int fd; 1550 int fd;
1089 1551
1090 for (fd = anfdmax; fd--; ) 1552 for (fd = anfdmax; fd--; )
1285 1747
1286/*****************************************************************************/ 1748/*****************************************************************************/
1287 1749
1288#if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE 1750#if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
1289 1751
1290static void noinline 1752static void noinline ecb_cold
1291evpipe_init (EV_P) 1753evpipe_init (EV_P)
1292{ 1754{
1293 if (!ev_is_active (&pipe_w)) 1755 if (!ev_is_active (&pipe_w))
1294 { 1756 {
1295# if EV_USE_EVENTFD 1757# if EV_USE_EVENTFD
1317 ev_io_start (EV_A_ &pipe_w); 1779 ev_io_start (EV_A_ &pipe_w);
1318 ev_unref (EV_A); /* watcher should not keep loop alive */ 1780 ev_unref (EV_A); /* watcher should not keep loop alive */
1319 } 1781 }
1320} 1782}
1321 1783
1322inline_size void 1784inline_speed void
1323evpipe_write (EV_P_ EV_ATOMIC_T *flag) 1785evpipe_write (EV_P_ EV_ATOMIC_T *flag)
1324{ 1786{
1325 if (!*flag) 1787 if (expect_true (*flag))
1788 return;
1789
1790 *flag = 1;
1791
1792 ECB_MEMORY_FENCE_RELEASE; /* make sure flag is visible before the wakeup */
1793
1794 pipe_write_skipped = 1;
1795
1796 ECB_MEMORY_FENCE; /* make sure pipe_write_skipped is visible before we check pipe_write_wanted */
1797
1798 if (pipe_write_wanted)
1326 { 1799 {
1800 int old_errno;
1801
1802 pipe_write_skipped = 0; /* just an optimisation, no fence needed */
1803
1327 int old_errno = errno; /* save errno because write might clobber it */ 1804 old_errno = errno; /* save errno because write will clobber it */
1328 char dummy;
1329
1330 *flag = 1;
1331 1805
1332#if EV_USE_EVENTFD 1806#if EV_USE_EVENTFD
1333 if (evfd >= 0) 1807 if (evfd >= 0)
1334 { 1808 {
1335 uint64_t counter = 1; 1809 uint64_t counter = 1;
1336 write (evfd, &counter, sizeof (uint64_t)); 1810 write (evfd, &counter, sizeof (uint64_t));
1337 } 1811 }
1338 else 1812 else
1339#endif 1813#endif
1814 {
1340 /* win32 people keep sending patches that change this write() to send() */ 1815 /* win32 people keep sending patches that change this write() to send() */
1341 /* and then run away. but send() is wrong, it wants a socket handle on win32 */ 1816 /* and then run away. but send() is wrong, it wants a socket handle on win32 */
1342 /* so when you think this write should be a send instead, please find out */ 1817 /* so when you think this write should be a send instead, please find out */
1343 /* where your send() is from - it's definitely not the microsoft send, and */ 1818 /* where your send() is from - it's definitely not the microsoft send, and */
1344 /* tell me. thank you. */ 1819 /* tell me. thank you. */
1345 write (evpipe [1], &dummy, 1); 1820 write (evpipe [1], &(evpipe [1]), 1);
1821 }
1346 1822
1347 errno = old_errno; 1823 errno = old_errno;
1348 } 1824 }
1349} 1825}
1350 1826
1353static void 1829static void
1354pipecb (EV_P_ ev_io *iow, int revents) 1830pipecb (EV_P_ ev_io *iow, int revents)
1355{ 1831{
1356 int i; 1832 int i;
1357 1833
1834 if (revents & EV_READ)
1835 {
1358#if EV_USE_EVENTFD 1836#if EV_USE_EVENTFD
1359 if (evfd >= 0) 1837 if (evfd >= 0)
1360 { 1838 {
1361 uint64_t counter; 1839 uint64_t counter;
1362 read (evfd, &counter, sizeof (uint64_t)); 1840 read (evfd, &counter, sizeof (uint64_t));
1363 } 1841 }
1364 else 1842 else
1365#endif 1843#endif
1366 { 1844 {
1367 char dummy; 1845 char dummy;
1368 /* see discussion in evpipe_write when you think this read should be recv in win32 */ 1846 /* see discussion in evpipe_write when you think this read should be recv in win32 */
1369 read (evpipe [0], &dummy, 1); 1847 read (evpipe [0], &dummy, 1);
1848 }
1370 } 1849 }
1850
1851 pipe_write_skipped = 0;
1371 1852
1372#if EV_SIGNAL_ENABLE 1853#if EV_SIGNAL_ENABLE
1373 if (sig_pending) 1854 if (sig_pending)
1374 { 1855 {
1375 sig_pending = 0; 1856 sig_pending = 0;
1376 1857
1377 for (i = EV_NSIG - 1; i--; ) 1858 for (i = EV_NSIG - 1; i--; )
1378 if (expect_false (signals [i].pending)) 1859 if (expect_false (signals [i].pending))
1379 ev_feed_signal_event (EV_A_ i + 1); 1860 ev_feed_signal_event (EV_A_ i + 1);
1404 EV_P = signals [signum - 1].loop; 1885 EV_P = signals [signum - 1].loop;
1405 1886
1406 if (!EV_A) 1887 if (!EV_A)
1407 return; 1888 return;
1408#endif 1889#endif
1890
1891 if (!ev_active (&pipe_w))
1892 return;
1409 1893
1410 signals [signum - 1].pending = 1; 1894 signals [signum - 1].pending = 1;
1411 evpipe_write (EV_A_ &sig_pending); 1895 evpipe_write (EV_A_ &sig_pending);
1412} 1896}
1413 1897
1545#endif 2029#endif
1546#if EV_USE_SELECT 2030#if EV_USE_SELECT
1547# include "ev_select.c" 2031# include "ev_select.c"
1548#endif 2032#endif
1549 2033
1550int 2034int ecb_cold
1551ev_version_major (void) 2035ev_version_major (void)
1552{ 2036{
1553 return EV_VERSION_MAJOR; 2037 return EV_VERSION_MAJOR;
1554} 2038}
1555 2039
1556int 2040int ecb_cold
1557ev_version_minor (void) 2041ev_version_minor (void)
1558{ 2042{
1559 return EV_VERSION_MINOR; 2043 return EV_VERSION_MINOR;
1560} 2044}
1561 2045
1562/* return true if we are running with elevated privileges and should ignore env variables */ 2046/* return true if we are running with elevated privileges and should ignore env variables */
1563int inline_size 2047int inline_size ecb_cold
1564enable_secure (void) 2048enable_secure (void)
1565{ 2049{
1566#ifdef _WIN32 2050#ifdef _WIN32
1567 return 0; 2051 return 0;
1568#else 2052#else
1569 return getuid () != geteuid () 2053 return getuid () != geteuid ()
1570 || getgid () != getegid (); 2054 || getgid () != getegid ();
1571#endif 2055#endif
1572} 2056}
1573 2057
1574unsigned int 2058unsigned int ecb_cold
1575ev_supported_backends (void) 2059ev_supported_backends (void)
1576{ 2060{
1577 unsigned int flags = 0; 2061 unsigned int flags = 0;
1578 2062
1579 if (EV_USE_PORT ) flags |= EVBACKEND_PORT; 2063 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
1583 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT; 2067 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
1584 2068
1585 return flags; 2069 return flags;
1586} 2070}
1587 2071
1588unsigned int 2072unsigned int ecb_cold
1589ev_recommended_backends (void) 2073ev_recommended_backends (void)
1590{ 2074{
1591 unsigned int flags = ev_supported_backends (); 2075 unsigned int flags = ev_supported_backends ();
1592 2076
1593#ifndef __NetBSD__ 2077#ifndef __NetBSD__
1605#endif 2089#endif
1606 2090
1607 return flags; 2091 return flags;
1608} 2092}
1609 2093
1610unsigned int 2094unsigned int ecb_cold
1611ev_embeddable_backends (void) 2095ev_embeddable_backends (void)
1612{ 2096{
1613 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT; 2097 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
1614 2098
1615 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */ 2099 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
1660ev_userdata (EV_P) 2144ev_userdata (EV_P)
1661{ 2145{
1662 return userdata; 2146 return userdata;
1663} 2147}
1664 2148
2149void
1665void ev_set_invoke_pending_cb (EV_P_ void (*invoke_pending_cb)(EV_P)) 2150ev_set_invoke_pending_cb (EV_P_ void (*invoke_pending_cb)(EV_P))
1666{ 2151{
1667 invoke_cb = invoke_pending_cb; 2152 invoke_cb = invoke_pending_cb;
1668} 2153}
1669 2154
2155void
1670void ev_set_loop_release_cb (EV_P_ void (*release)(EV_P), void (*acquire)(EV_P)) 2156ev_set_loop_release_cb (EV_P_ void (*release)(EV_P), void (*acquire)(EV_P))
1671{ 2157{
1672 release_cb = release; 2158 release_cb = release;
1673 acquire_cb = acquire; 2159 acquire_cb = acquire;
1674} 2160}
1675#endif 2161#endif
1676 2162
1677/* initialise a loop structure, must be zero-initialised */ 2163/* initialise a loop structure, must be zero-initialised */
1678static void noinline 2164static void noinline ecb_cold
1679loop_init (EV_P_ unsigned int flags) 2165loop_init (EV_P_ unsigned int flags)
1680{ 2166{
1681 if (!backend) 2167 if (!backend)
1682 { 2168 {
1683 origflags = flags; 2169 origflags = flags;
1711 if (!(flags & EVFLAG_NOENV) 2197 if (!(flags & EVFLAG_NOENV)
1712 && !enable_secure () 2198 && !enable_secure ()
1713 && getenv ("LIBEV_FLAGS")) 2199 && getenv ("LIBEV_FLAGS"))
1714 flags = atoi (getenv ("LIBEV_FLAGS")); 2200 flags = atoi (getenv ("LIBEV_FLAGS"));
1715 2201
1716 ev_rt_now = ev_time (); 2202 ev_rt_now = ev_time ();
1717 mn_now = get_clock (); 2203 mn_now = get_clock ();
1718 now_floor = mn_now; 2204 now_floor = mn_now;
1719 rtmn_diff = ev_rt_now - mn_now; 2205 rtmn_diff = ev_rt_now - mn_now;
1720#if EV_FEATURE_API 2206#if EV_FEATURE_API
1721 invoke_cb = ev_invoke_pending; 2207 invoke_cb = ev_invoke_pending;
1722#endif 2208#endif
1723 2209
1724 io_blocktime = 0.; 2210 io_blocktime = 0.;
1725 timeout_blocktime = 0.; 2211 timeout_blocktime = 0.;
1726 backend = 0; 2212 backend = 0;
1727 backend_fd = -1; 2213 backend_fd = -1;
1728 sig_pending = 0; 2214 sig_pending = 0;
1729#if EV_ASYNC_ENABLE 2215#if EV_ASYNC_ENABLE
1730 async_pending = 0; 2216 async_pending = 0;
1731#endif 2217#endif
2218 pipe_write_skipped = 0;
2219 pipe_write_wanted = 0;
1732#if EV_USE_INOTIFY 2220#if EV_USE_INOTIFY
1733 fs_fd = flags & EVFLAG_NOINOTIFY ? -1 : -2; 2221 fs_fd = flags & EVFLAG_NOINOTIFY ? -1 : -2;
1734#endif 2222#endif
1735#if EV_USE_SIGNALFD 2223#if EV_USE_SIGNALFD
1736 sigfd = flags & EVFLAG_SIGNALFD ? -2 : -1; 2224 sigfd = flags & EVFLAG_SIGNALFD ? -2 : -1;
1737#endif 2225#endif
1738 2226
1739 if (!(flags & EVBACKEND_MASK)) 2227 if (!(flags & EVBACKEND_MASK))
1740 flags |= ev_recommended_backends (); 2228 flags |= ev_recommended_backends ();
1741 2229
1766#endif 2254#endif
1767 } 2255 }
1768} 2256}
1769 2257
1770/* free up a loop structure */ 2258/* free up a loop structure */
1771void 2259void ecb_cold
1772ev_loop_destroy (EV_P) 2260ev_loop_destroy (EV_P)
1773{ 2261{
1774 int i; 2262 int i;
1775 2263
1776#if EV_MULTIPLICITY 2264#if EV_MULTIPLICITY
1906 infy_fork (EV_A); 2394 infy_fork (EV_A);
1907#endif 2395#endif
1908 2396
1909 if (ev_is_active (&pipe_w)) 2397 if (ev_is_active (&pipe_w))
1910 { 2398 {
1911 /* this "locks" the handlers against writing to the pipe */ 2399 /* pipe_write_wanted must be false now, so modifying fd vars should be safe */
1912 /* while we modify the fd vars */
1913 sig_pending = 1;
1914#if EV_ASYNC_ENABLE
1915 async_pending = 1;
1916#endif
1917 2400
1918 ev_ref (EV_A); 2401 ev_ref (EV_A);
1919 ev_io_stop (EV_A_ &pipe_w); 2402 ev_io_stop (EV_A_ &pipe_w);
1920 2403
1921#if EV_USE_EVENTFD 2404#if EV_USE_EVENTFD
1939 postfork = 0; 2422 postfork = 0;
1940} 2423}
1941 2424
1942#if EV_MULTIPLICITY 2425#if EV_MULTIPLICITY
1943 2426
1944struct ev_loop * 2427struct ev_loop * ecb_cold
1945ev_loop_new (unsigned int flags) 2428ev_loop_new (unsigned int flags)
1946{ 2429{
1947 EV_P = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop)); 2430 EV_P = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
1948 2431
1949 memset (EV_A, 0, sizeof (struct ev_loop)); 2432 memset (EV_A, 0, sizeof (struct ev_loop));
1957} 2440}
1958 2441
1959#endif /* multiplicity */ 2442#endif /* multiplicity */
1960 2443
1961#if EV_VERIFY 2444#if EV_VERIFY
1962static void noinline 2445static void noinline ecb_cold
1963verify_watcher (EV_P_ W w) 2446verify_watcher (EV_P_ W w)
1964{ 2447{
1965 assert (("libev: watcher has invalid priority", ABSPRI (w) >= 0 && ABSPRI (w) < NUMPRI)); 2448 assert (("libev: watcher has invalid priority", ABSPRI (w) >= 0 && ABSPRI (w) < NUMPRI));
1966 2449
1967 if (w->pending) 2450 if (w->pending)
1968 assert (("libev: pending watcher not on pending queue", pendings [ABSPRI (w)][w->pending - 1].w == w)); 2451 assert (("libev: pending watcher not on pending queue", pendings [ABSPRI (w)][w->pending - 1].w == w));
1969} 2452}
1970 2453
1971static void noinline 2454static void noinline ecb_cold
1972verify_heap (EV_P_ ANHE *heap, int N) 2455verify_heap (EV_P_ ANHE *heap, int N)
1973{ 2456{
1974 int i; 2457 int i;
1975 2458
1976 for (i = HEAP0; i < N + HEAP0; ++i) 2459 for (i = HEAP0; i < N + HEAP0; ++i)
1981 2464
1982 verify_watcher (EV_A_ (W)ANHE_w (heap [i])); 2465 verify_watcher (EV_A_ (W)ANHE_w (heap [i]));
1983 } 2466 }
1984} 2467}
1985 2468
1986static void noinline 2469static void noinline ecb_cold
1987array_verify (EV_P_ W *ws, int cnt) 2470array_verify (EV_P_ W *ws, int cnt)
1988{ 2471{
1989 while (cnt--) 2472 while (cnt--)
1990 { 2473 {
1991 assert (("libev: active index mismatch", ev_active (ws [cnt]) == cnt + 1)); 2474 assert (("libev: active index mismatch", ev_active (ws [cnt]) == cnt + 1));
1993 } 2476 }
1994} 2477}
1995#endif 2478#endif
1996 2479
1997#if EV_FEATURE_API 2480#if EV_FEATURE_API
1998void 2481void ecb_cold
1999ev_verify (EV_P) 2482ev_verify (EV_P)
2000{ 2483{
2001#if EV_VERIFY 2484#if EV_VERIFY
2002 int i; 2485 int i;
2003 WL w; 2486 WL w;
2069#endif 2552#endif
2070} 2553}
2071#endif 2554#endif
2072 2555
2073#if EV_MULTIPLICITY 2556#if EV_MULTIPLICITY
2074struct ev_loop * 2557struct ev_loop * ecb_cold
2075#else 2558#else
2076int 2559int
2077#endif 2560#endif
2078ev_default_loop (unsigned int flags) 2561ev_default_loop (unsigned int flags)
2079{ 2562{
2208 } 2691 }
2209} 2692}
2210 2693
2211#if EV_PERIODIC_ENABLE 2694#if EV_PERIODIC_ENABLE
2212 2695
2213inline_speed void 2696static void noinline
2214periodic_recalc (EV_P_ ev_periodic *w) 2697periodic_recalc (EV_P_ ev_periodic *w)
2215{ 2698{
2216 /* TODO: use slow but potentially more correct incremental algo, */ 2699 ev_tstamp interval = w->interval > MIN_INTERVAL ? w->interval : MIN_INTERVAL;
2217 /* also do not rely on ceil */ 2700 ev_tstamp at = w->offset + interval * ev_floor ((ev_rt_now - w->offset) / interval);
2218 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval; 2701
2702 /* the above almost always errs on the low side */
2703 while (at <= ev_rt_now)
2704 {
2705 ev_tstamp nat = at + w->interval;
2706
2707 /* when resolution fails us, we use ev_rt_now */
2708 if (expect_false (nat == at))
2709 {
2710 at = ev_rt_now;
2711 break;
2712 }
2713
2714 at = nat;
2715 }
2716
2717 ev_at (w) = at;
2219} 2718}
2220 2719
2221/* make periodics pending */ 2720/* make periodics pending */
2222inline_size void 2721inline_size void
2223periodics_reify (EV_P) 2722periodics_reify (EV_P)
2245 downheap (periodics, periodiccnt, HEAP0); 2744 downheap (periodics, periodiccnt, HEAP0);
2246 } 2745 }
2247 else if (w->interval) 2746 else if (w->interval)
2248 { 2747 {
2249 periodic_recalc (EV_A_ w); 2748 periodic_recalc (EV_A_ w);
2250
2251 /* if next trigger time is not sufficiently in the future, put it there */
2252 /* this might happen because of floating point inexactness */
2253 if (ev_at (w) - ev_rt_now < TIME_EPSILON)
2254 {
2255 ev_at (w) += w->interval;
2256
2257 /* if interval is unreasonably low we might still have a time in the past */
2258 /* so correct this. this will make the periodic very inexact, but the user */
2259 /* has effectively asked to get triggered more often than possible */
2260 if (ev_at (w) < ev_rt_now)
2261 ev_at (w) = ev_rt_now;
2262 }
2263
2264 ANHE_at_cache (periodics [HEAP0]); 2749 ANHE_at_cache (periodics [HEAP0]);
2265 downheap (periodics, periodiccnt, HEAP0); 2750 downheap (periodics, periodiccnt, HEAP0);
2266 } 2751 }
2267 else 2752 else
2268 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */ 2753 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
2276 } 2761 }
2277} 2762}
2278 2763
2279/* simply recalculate all periodics */ 2764/* simply recalculate all periodics */
2280/* TODO: maybe ensure that at least one event happens when jumping forward? */ 2765/* TODO: maybe ensure that at least one event happens when jumping forward? */
2281static void noinline 2766static void noinline ecb_cold
2282periodics_reschedule (EV_P) 2767periodics_reschedule (EV_P)
2283{ 2768{
2284 int i; 2769 int i;
2285 2770
2286 /* adjust periodics after time jump */ 2771 /* adjust periodics after time jump */
2299 reheap (periodics, periodiccnt); 2784 reheap (periodics, periodiccnt);
2300} 2785}
2301#endif 2786#endif
2302 2787
2303/* adjust all timers by a given offset */ 2788/* adjust all timers by a given offset */
2304static void noinline 2789static void noinline ecb_cold
2305timers_reschedule (EV_P_ ev_tstamp adjust) 2790timers_reschedule (EV_P_ ev_tstamp adjust)
2306{ 2791{
2307 int i; 2792 int i;
2308 2793
2309 for (i = 0; i < timercnt; ++i) 2794 for (i = 0; i < timercnt; ++i)
2346 * doesn't hurt either as we only do this on time-jumps or 2831 * doesn't hurt either as we only do this on time-jumps or
2347 * in the unlikely event of having been preempted here. 2832 * in the unlikely event of having been preempted here.
2348 */ 2833 */
2349 for (i = 4; --i; ) 2834 for (i = 4; --i; )
2350 { 2835 {
2836 ev_tstamp diff;
2351 rtmn_diff = ev_rt_now - mn_now; 2837 rtmn_diff = ev_rt_now - mn_now;
2352 2838
2839 diff = odiff - rtmn_diff;
2840
2353 if (expect_true (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)) 2841 if (expect_true ((diff < 0. ? -diff : diff) < MIN_TIMEJUMP))
2354 return; /* all is well */ 2842 return; /* all is well */
2355 2843
2356 ev_rt_now = ev_time (); 2844 ev_rt_now = ev_time ();
2357 mn_now = get_clock (); 2845 mn_now = get_clock ();
2358 now_floor = mn_now; 2846 now_floor = mn_now;
2448 ev_tstamp prev_mn_now = mn_now; 2936 ev_tstamp prev_mn_now = mn_now;
2449 2937
2450 /* update time to cancel out callback processing overhead */ 2938 /* update time to cancel out callback processing overhead */
2451 time_update (EV_A_ 1e100); 2939 time_update (EV_A_ 1e100);
2452 2940
2941 /* from now on, we want a pipe-wake-up */
2942 pipe_write_wanted = 1;
2943
2944 ECB_MEMORY_FENCE; /* make sure pipe_write_wanted is visible before we check for potential skips */
2945
2453 if (expect_true (!(flags & EVRUN_NOWAIT || idleall || !activecnt))) 2946 if (expect_true (!(flags & EVRUN_NOWAIT || idleall || !activecnt || pipe_write_skipped)))
2454 { 2947 {
2455 waittime = MAX_BLOCKTIME; 2948 waittime = MAX_BLOCKTIME;
2456 2949
2457 if (timercnt) 2950 if (timercnt)
2458 { 2951 {
2459 ev_tstamp to = ANHE_at (timers [HEAP0]) - mn_now + backend_fudge; 2952 ev_tstamp to = ANHE_at (timers [HEAP0]) - mn_now;
2460 if (waittime > to) waittime = to; 2953 if (waittime > to) waittime = to;
2461 } 2954 }
2462 2955
2463#if EV_PERIODIC_ENABLE 2956#if EV_PERIODIC_ENABLE
2464 if (periodiccnt) 2957 if (periodiccnt)
2465 { 2958 {
2466 ev_tstamp to = ANHE_at (periodics [HEAP0]) - ev_rt_now + backend_fudge; 2959 ev_tstamp to = ANHE_at (periodics [HEAP0]) - ev_rt_now;
2467 if (waittime > to) waittime = to; 2960 if (waittime > to) waittime = to;
2468 } 2961 }
2469#endif 2962#endif
2470 2963
2471 /* don't let timeouts decrease the waittime below timeout_blocktime */ 2964 /* don't let timeouts decrease the waittime below timeout_blocktime */
2472 if (expect_false (waittime < timeout_blocktime)) 2965 if (expect_false (waittime < timeout_blocktime))
2473 waittime = timeout_blocktime; 2966 waittime = timeout_blocktime;
2967
2968 /* at this point, we NEED to wait, so we have to ensure */
2969 /* to pass a minimum nonzero value to the backend */
2970 if (expect_false (waittime < backend_mintime))
2971 waittime = backend_mintime;
2474 2972
2475 /* extra check because io_blocktime is commonly 0 */ 2973 /* extra check because io_blocktime is commonly 0 */
2476 if (expect_false (io_blocktime)) 2974 if (expect_false (io_blocktime))
2477 { 2975 {
2478 sleeptime = io_blocktime - (mn_now - prev_mn_now); 2976 sleeptime = io_blocktime - (mn_now - prev_mn_now);
2479 2977
2480 if (sleeptime > waittime - backend_fudge) 2978 if (sleeptime > waittime - backend_mintime)
2481 sleeptime = waittime - backend_fudge; 2979 sleeptime = waittime - backend_mintime;
2482 2980
2483 if (expect_true (sleeptime > 0.)) 2981 if (expect_true (sleeptime > 0.))
2484 { 2982 {
2485 ev_sleep (sleeptime); 2983 ev_sleep (sleeptime);
2486 waittime -= sleeptime; 2984 waittime -= sleeptime;
2492 ++loop_count; 2990 ++loop_count;
2493#endif 2991#endif
2494 assert ((loop_done = EVBREAK_RECURSE, 1)); /* assert for side effect */ 2992 assert ((loop_done = EVBREAK_RECURSE, 1)); /* assert for side effect */
2495 backend_poll (EV_A_ waittime); 2993 backend_poll (EV_A_ waittime);
2496 assert ((loop_done = EVBREAK_CANCEL, 1)); /* assert for side effect */ 2994 assert ((loop_done = EVBREAK_CANCEL, 1)); /* assert for side effect */
2995
2996 pipe_write_wanted = 0; /* just an optimsiation, no fence needed */
2997
2998 if (pipe_write_skipped)
2999 {
3000 assert (("libev: pipe_w not active, but pipe not written", ev_is_active (&pipe_w)));
3001 ev_feed_event (EV_A_ &pipe_w, EV_CUSTOM);
3002 }
3003
2497 3004
2498 /* update ev_rt_now, do magic */ 3005 /* update ev_rt_now, do magic */
2499 time_update (EV_A_ waittime + sleeptime); 3006 time_update (EV_A_ waittime + sleeptime);
2500 } 3007 }
2501 3008
3078 if (!pend || pend == path) 3585 if (!pend || pend == path)
3079 break; 3586 break;
3080 3587
3081 *pend = 0; 3588 *pend = 0;
3082 w->wd = inotify_add_watch (fs_fd, path, mask); 3589 w->wd = inotify_add_watch (fs_fd, path, mask);
3083 } 3590 }
3084 while (w->wd < 0 && (errno == ENOENT || errno == EACCES)); 3591 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
3085 } 3592 }
3086 } 3593 }
3087 3594
3088 if (w->wd >= 0) 3595 if (w->wd >= 0)
3155 infy_wd (EV_A_ ev->wd, ev->wd, ev); 3662 infy_wd (EV_A_ ev->wd, ev->wd, ev);
3156 ofs += sizeof (struct inotify_event) + ev->len; 3663 ofs += sizeof (struct inotify_event) + ev->len;
3157 } 3664 }
3158} 3665}
3159 3666
3160inline_size void 3667inline_size void ecb_cold
3161ev_check_2625 (EV_P) 3668ev_check_2625 (EV_P)
3162{ 3669{
3163 /* kernels < 2.6.25 are borked 3670 /* kernels < 2.6.25 are borked
3164 * http://www.ussg.indiana.edu/hypermail/linux/kernel/0711.3/1208.html 3671 * http://www.ussg.indiana.edu/hypermail/linux/kernel/0711.3/1208.html
3165 */ 3672 */
3790} 4297}
3791 4298
3792/*****************************************************************************/ 4299/*****************************************************************************/
3793 4300
3794#if EV_WALK_ENABLE 4301#if EV_WALK_ENABLE
3795void 4302void ecb_cold
3796ev_walk (EV_P_ int types, void (*cb)(EV_P_ int type, void *w)) 4303ev_walk (EV_P_ int types, void (*cb)(EV_P_ int type, void *w))
3797{ 4304{
3798 int i, j; 4305 int i, j;
3799 ev_watcher_list *wl, *wn; 4306 ev_watcher_list *wl, *wn;
3800 4307
3844 cb (EV_A_ EV_PERIODIC, ANHE_w (periodics [i])); 4351 cb (EV_A_ EV_PERIODIC, ANHE_w (periodics [i]));
3845#endif 4352#endif
3846 4353
3847#if EV_IDLE_ENABLE 4354#if EV_IDLE_ENABLE
3848 if (types & EV_IDLE) 4355 if (types & EV_IDLE)
3849 for (j = NUMPRI; i--; ) 4356 for (j = NUMPRI; j--; )
3850 for (i = idlecnt [j]; i--; ) 4357 for (i = idlecnt [j]; i--; )
3851 cb (EV_A_ EV_IDLE, idles [j][i]); 4358 cb (EV_A_ EV_IDLE, idles [j][i]);
3852#endif 4359#endif
3853 4360
3854#if EV_FORK_ENABLE 4361#if EV_FORK_ENABLE
3907 4414
3908#if EV_MULTIPLICITY 4415#if EV_MULTIPLICITY
3909 #include "ev_wrap.h" 4416 #include "ev_wrap.h"
3910#endif 4417#endif
3911 4418
3912EV_CPP(})
3913

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