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Comparing libev/ev.c (file contents):
Revision 1.367 by root, Tue Jan 11 02:15:58 2011 UTC vs.
Revision 1.398 by root, Sun Sep 25 21:27:35 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
… …
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
… …
442#else 452#else
443# define EV_FREQUENT_CHECK do { } while (0) 453# define EV_FREQUENT_CHECK do { } while (0)
444#endif 454#endif
445 455
446/* 456/*
447 * This is used to avoid floating point rounding problems. 457 * This is used to work around floating point rounding problems.
448 * It is added to ev_rt_now when scheduling periodics
449 * to ensure progress, time-wise, even when rounding
450 * errors are against us.
451 * This value is good at least till the year 4000. 458 * This value is good at least till the year 4000.
452 * Better solutions welcome.
453 */ 459 */
454#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 */
455 462
456#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) */
457#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) */
458 465
459#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)
460#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)
461 468
469/* the following is ecb.h embedded into libev - use update_ev_c to update from an external copy */
470/* ECB.H BEGIN */
471/*
472 * libecb - http://software.schmorp.de/pkg/libecb
473 *
474 * Copyright (©) 2009-2011 Marc Alexander Lehmann <libecb@schmorp.de>
475 * Copyright (©) 2011 Emanuele Giaquinta
476 * All rights reserved.
477 *
478 * Redistribution and use in source and binary forms, with or without modifica-
479 * tion, are permitted provided that the following conditions are met:
480 *
481 * 1. Redistributions of source code must retain the above copyright notice,
482 * this list of conditions and the following disclaimer.
483 *
484 * 2. Redistributions in binary form must reproduce the above copyright
485 * notice, this list of conditions and the following disclaimer in the
486 * documentation and/or other materials provided with the distribution.
487 *
488 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
489 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
490 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
491 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
492 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
493 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
494 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
495 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
496 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
497 * OF THE POSSIBILITY OF SUCH DAMAGE.
498 */
499
500#ifndef ECB_H
501#define ECB_H
502
503#ifdef _WIN32
504 typedef signed char int8_t;
505 typedef unsigned char uint8_t;
506 typedef signed short int16_t;
507 typedef unsigned short uint16_t;
508 typedef signed int int32_t;
509 typedef unsigned int uint32_t;
462#if __GNUC__ >= 4 510 #if __GNUC__
463# define expect(expr,value) __builtin_expect ((expr),(value)) 511 typedef signed long long int64_t;
464# define noinline __attribute__ ((noinline)) 512 typedef unsigned long long uint64_t;
513 #else /* _MSC_VER || __BORLANDC__ */
514 typedef signed __int64 int64_t;
515 typedef unsigned __int64 uint64_t;
516 #endif
465#else 517#else
466# define expect(expr,value) (expr) 518 #include <inttypes.h>
467# define noinline
468# if __STDC_VERSION__ < 199901L && __GNUC__ < 2
469# define inline
470# endif 519#endif
520
521/* many compilers define _GNUC_ to some versions but then only implement
522 * what their idiot authors think are the "more important" extensions,
523 * causing enormous grief in return for some better fake benchmark numbers.
524 * or so.
525 * we try to detect these and simply assume they are not gcc - if they have
526 * an issue with that they should have done it right in the first place.
527 */
528#ifndef ECB_GCC_VERSION
529 #if !defined(__GNUC_MINOR__) || defined(__INTEL_COMPILER) || defined(__SUNPRO_C) || defined(__SUNPRO_CC) || defined(__llvm__) || defined(__clang__)
530 #define ECB_GCC_VERSION(major,minor) 0
531 #else
532 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
471#endif 533 #endif
534#endif
472 535
536/*****************************************************************************/
537
538/* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
539/* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
540
541#if ECB_NO_THREADS || ECB_NO_SMP
542 #define ECB_MEMORY_FENCE do { } while (0)
543#endif
544
545#ifndef ECB_MEMORY_FENCE
546 #if ECB_GCC_VERSION(2,5) || defined(__INTEL_COMPILER) || defined(__clang__)
547 #if __i386__
548 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
549 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE /* non-lock xchg might be enough */
550 #define ECB_MEMORY_FENCE_RELEASE do { } while (0) /* unlikely to change in future cpus */
551 #elif __amd64
552 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
553 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("lfence" : : : "memory")
554 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("sfence") /* play safe - not needed in any current cpu */
555 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
556 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
557 #elif defined(__ARM_ARCH_6__ ) || defined(__ARM_ARCH_6J__ ) \
558 || defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6ZK__)
559 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
560 #elif defined(__ARM_ARCH_7__ ) || defined(__ARM_ARCH_7A__ ) \
561 || defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7R__ )
562 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
563 #endif
564 #endif
565#endif
566
567#ifndef ECB_MEMORY_FENCE
568 #if ECB_GCC_VERSION(4,4) || defined(__INTEL_COMPILER) || defined(__clang__)
569 #define ECB_MEMORY_FENCE __sync_synchronize ()
570 /*#define ECB_MEMORY_FENCE_ACQUIRE ({ char dummy = 0; __sync_lock_test_and_set (&dummy, 1); }) */
571 /*#define ECB_MEMORY_FENCE_RELEASE ({ char dummy = 1; __sync_lock_release (&dummy ); }) */
572 #elif _MSC_VER >= 1400 /* VC++ 2005 */
573 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
574 #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
575 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
576 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
577 #elif defined(_WIN32)
578 #include <WinNT.h>
579 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
580 #endif
581#endif
582
583#ifndef ECB_MEMORY_FENCE
584 #if !ECB_AVOID_PTHREADS
585 /*
586 * if you get undefined symbol references to pthread_mutex_lock,
587 * or failure to find pthread.h, then you should implement
588 * the ECB_MEMORY_FENCE operations for your cpu/compiler
589 * OR provide pthread.h and link against the posix thread library
590 * of your system.
591 */
592 #include <pthread.h>
593 #define ECB_NEEDS_PTHREADS 1
594 #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
595
596 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
597 #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
598 #endif
599#endif
600
601#if !defined(ECB_MEMORY_FENCE_ACQUIRE) && defined(ECB_MEMORY_FENCE)
602 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
603#endif
604
605#if !defined(ECB_MEMORY_FENCE_RELEASE) && defined(ECB_MEMORY_FENCE)
606 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
607#endif
608
609/*****************************************************************************/
610
611#define ECB_C99 (__STDC_VERSION__ >= 199901L)
612
613#if __cplusplus
614 #define ecb_inline static inline
615#elif ECB_GCC_VERSION(2,5)
616 #define ecb_inline static __inline__
617#elif ECB_C99
618 #define ecb_inline static inline
619#else
620 #define ecb_inline static
621#endif
622
623#if ECB_GCC_VERSION(3,3)
624 #define ecb_restrict __restrict__
625#elif ECB_C99
626 #define ecb_restrict restrict
627#else
628 #define ecb_restrict
629#endif
630
631typedef int ecb_bool;
632
633#define ECB_CONCAT_(a, b) a ## b
634#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
635#define ECB_STRINGIFY_(a) # a
636#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
637
638#define ecb_function_ ecb_inline
639
640#if ECB_GCC_VERSION(3,1)
641 #define ecb_attribute(attrlist) __attribute__(attrlist)
642 #define ecb_is_constant(expr) __builtin_constant_p (expr)
643 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
644 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
645#else
646 #define ecb_attribute(attrlist)
647 #define ecb_is_constant(expr) 0
648 #define ecb_expect(expr,value) (expr)
649 #define ecb_prefetch(addr,rw,locality)
650#endif
651
652/* no emulation for ecb_decltype */
653#if ECB_GCC_VERSION(4,5)
654 #define ecb_decltype(x) __decltype(x)
655#elif ECB_GCC_VERSION(3,0)
656 #define ecb_decltype(x) __typeof(x)
657#endif
658
659#define ecb_noinline ecb_attribute ((__noinline__))
660#define ecb_noreturn ecb_attribute ((__noreturn__))
661#define ecb_unused ecb_attribute ((__unused__))
662#define ecb_const ecb_attribute ((__const__))
663#define ecb_pure ecb_attribute ((__pure__))
664
665#if ECB_GCC_VERSION(4,3)
666 #define ecb_artificial ecb_attribute ((__artificial__))
667 #define ecb_hot ecb_attribute ((__hot__))
668 #define ecb_cold ecb_attribute ((__cold__))
669#else
670 #define ecb_artificial
671 #define ecb_hot
672 #define ecb_cold
673#endif
674
675/* put around conditional expressions if you are very sure that the */
676/* expression is mostly true or mostly false. note that these return */
677/* booleans, not the expression. */
473#define expect_false(expr) expect ((expr) != 0, 0) 678#define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
474#define expect_true(expr) expect ((expr) != 0, 1) 679#define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
680/* for compatibility to the rest of the world */
681#define ecb_likely(expr) ecb_expect_true (expr)
682#define ecb_unlikely(expr) ecb_expect_false (expr)
683
684/* count trailing zero bits and count # of one bits */
685#if ECB_GCC_VERSION(3,4)
686 /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
687 #define ecb_ld32(x) (__builtin_clz (x) ^ 31)
688 #define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
689 #define ecb_ctz32(x) __builtin_ctz (x)
690 #define ecb_ctz64(x) __builtin_ctzll (x)
691 #define ecb_popcount32(x) __builtin_popcount (x)
692 /* no popcountll */
693#else
694 ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const;
695 ecb_function_ int
696 ecb_ctz32 (uint32_t x)
697 {
698 int r = 0;
699
700 x &= ~x + 1; /* this isolates the lowest bit */
701
702#if ECB_branchless_on_i386
703 r += !!(x & 0xaaaaaaaa) << 0;
704 r += !!(x & 0xcccccccc) << 1;
705 r += !!(x & 0xf0f0f0f0) << 2;
706 r += !!(x & 0xff00ff00) << 3;
707 r += !!(x & 0xffff0000) << 4;
708#else
709 if (x & 0xaaaaaaaa) r += 1;
710 if (x & 0xcccccccc) r += 2;
711 if (x & 0xf0f0f0f0) r += 4;
712 if (x & 0xff00ff00) r += 8;
713 if (x & 0xffff0000) r += 16;
714#endif
715
716 return r;
717 }
718
719 ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const;
720 ecb_function_ int
721 ecb_ctz64 (uint64_t x)
722 {
723 int shift = x & 0xffffffffU ? 0 : 32;
724 return ecb_ctz32 (x >> shift) + shift;
725 }
726
727 ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const;
728 ecb_function_ int
729 ecb_popcount32 (uint32_t x)
730 {
731 x -= (x >> 1) & 0x55555555;
732 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
733 x = ((x >> 4) + x) & 0x0f0f0f0f;
734 x *= 0x01010101;
735
736 return x >> 24;
737 }
738
739 ecb_function_ int ecb_ld32 (uint32_t x) ecb_const;
740 ecb_function_ int ecb_ld32 (uint32_t x)
741 {
742 int r = 0;
743
744 if (x >> 16) { x >>= 16; r += 16; }
745 if (x >> 8) { x >>= 8; r += 8; }
746 if (x >> 4) { x >>= 4; r += 4; }
747 if (x >> 2) { x >>= 2; r += 2; }
748 if (x >> 1) { r += 1; }
749
750 return r;
751 }
752
753 ecb_function_ int ecb_ld64 (uint64_t x) ecb_const;
754 ecb_function_ int ecb_ld64 (uint64_t x)
755 {
756 int r = 0;
757
758 if (x >> 32) { x >>= 32; r += 32; }
759
760 return r + ecb_ld32 (x);
761 }
762#endif
763
764/* popcount64 is only available on 64 bit cpus as gcc builtin */
765/* so for this version we are lazy */
766ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;
767ecb_function_ int
768ecb_popcount64 (uint64_t x)
769{
770 return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
771}
772
773ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const;
774ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const;
775ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const;
776ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const;
777ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
778ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
779ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const;
780ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const;
781
782ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }
783ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }
784ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }
785ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }
786ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
787ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
788ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
789ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }
790
791#if ECB_GCC_VERSION(4,3)
792 #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
793 #define ecb_bswap32(x) __builtin_bswap32 (x)
794 #define ecb_bswap64(x) __builtin_bswap64 (x)
795#else
796 ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const;
797 ecb_function_ uint16_t
798 ecb_bswap16 (uint16_t x)
799 {
800 return ecb_rotl16 (x, 8);
801 }
802
803 ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const;
804 ecb_function_ uint32_t
805 ecb_bswap32 (uint32_t x)
806 {
807 return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
808 }
809
810 ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const;
811 ecb_function_ uint64_t
812 ecb_bswap64 (uint64_t x)
813 {
814 return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
815 }
816#endif
817
818#if ECB_GCC_VERSION(4,5)
819 #define ecb_unreachable() __builtin_unreachable ()
820#else
821 /* this seems to work fine, but gcc always emits a warning for it :/ */
822 ecb_function_ void ecb_unreachable (void) ecb_noreturn;
823 ecb_function_ void ecb_unreachable (void) { }
824#endif
825
826/* try to tell the compiler that some condition is definitely true */
827#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
828
829ecb_function_ unsigned char ecb_byteorder_helper (void) ecb_const;
830ecb_function_ unsigned char
831ecb_byteorder_helper (void)
832{
833 const uint32_t u = 0x11223344;
834 return *(unsigned char *)&u;
835}
836
837ecb_function_ ecb_bool ecb_big_endian (void) ecb_const;
838ecb_function_ ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
839ecb_function_ ecb_bool ecb_little_endian (void) ecb_const;
840ecb_function_ ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
841
842#if ECB_GCC_VERSION(3,0) || ECB_C99
843 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
844#else
845 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
846#endif
847
848#if __cplusplus
849 template<typename T>
850 static inline T ecb_div_rd (T val, T div)
851 {
852 return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
853 }
854 template<typename T>
855 static inline T ecb_div_ru (T val, T div)
856 {
857 return val < 0 ? - ((-val ) / div) : (val + div - 1) / div;
858 }
859#else
860 #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
861 #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
862#endif
863
864#if ecb_cplusplus_does_not_suck
865 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
866 template<typename T, int N>
867 static inline int ecb_array_length (const T (&arr)[N])
868 {
869 return N;
870 }
871#else
872 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
873#endif
874
875#endif
876
877/* ECB.H END */
878
879#if ECB_MEMORY_FENCE_NEEDS_PTHREADS
880/* if your architecture doesn't need memory fences, e.g. because it is
881 * single-cpu/core, or if you use libev in a project that doesn't use libev
882 * from multiple threads, then you can define ECB_AVOID_PTHREADS when compiling
883 * libev, in which casess the memory fences become nops.
884 * alternatively, you can remove this #error and link against libpthread,
885 * which will then provide the memory fences.
886 */
887# error "memory fences not defined for your architecture, please report"
888#endif
889
890#ifndef ECB_MEMORY_FENCE
891# define ECB_MEMORY_FENCE do { } while (0)
892# define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
893# define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
894#endif
895
896#define expect_false(cond) ecb_expect_false (cond)
897#define expect_true(cond) ecb_expect_true (cond)
898#define noinline ecb_noinline
899
475#define inline_size static inline 900#define inline_size ecb_inline
476 901
477#if EV_FEATURE_CODE 902#if EV_FEATURE_CODE
478# define inline_speed static inline 903# define inline_speed ecb_inline
479#else 904#else
480# define inline_speed static noinline 905# define inline_speed static noinline
481#endif 906#endif
482 907
483#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1) 908#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
… …
522# include "ev_win32.c" 947# include "ev_win32.c"
523#endif 948#endif
524 949
525/*****************************************************************************/ 950/*****************************************************************************/
526 951
952/* define a suitable floor function (only used by periodics atm) */
953
954#if EV_USE_FLOOR
955# include <math.h>
956# define ev_floor(v) floor (v)
957#else
958
959#include <float.h>
960
961/* a floor() replacement function, should be independent of ev_tstamp type */
962static ev_tstamp noinline
963ev_floor (ev_tstamp v)
964{
965 /* the choice of shift factor is not terribly important */
966#if FLT_RADIX != 2 /* assume FLT_RADIX == 10 */
967 const ev_tstamp shift = sizeof (unsigned long) >= 8 ? 10000000000000000000. : 1000000000.;
968#else
969 const ev_tstamp shift = sizeof (unsigned long) >= 8 ? 18446744073709551616. : 4294967296.;
970#endif
971
972 /* argument too large for an unsigned long? */
973 if (expect_false (v >= shift))
974 {
975 ev_tstamp f;
976
977 if (v == v - 1.)
978 return v; /* very large number */
979
980 f = shift * ev_floor (v * (1. / shift));
981 return f + ev_floor (v - f);
982 }
983
984 /* special treatment for negative args? */
985 if (expect_false (v < 0.))
986 {
987 ev_tstamp f = -ev_floor (-v);
988
989 return f - (f == v ? 0 : 1);
990 }
991
992 /* fits into an unsigned long */
993 return (unsigned long)v;
994}
995
996#endif
997
998/*****************************************************************************/
999
527#ifdef __linux 1000#ifdef __linux
528# include <sys/utsname.h> 1001# include <sys/utsname.h>
529#endif 1002#endif
530 1003
531static unsigned int noinline 1004static unsigned int noinline ecb_cold
532ev_linux_version (void) 1005ev_linux_version (void)
533{ 1006{
534#ifdef __linux 1007#ifdef __linux
535 unsigned int v = 0; 1008 unsigned int v = 0;
536 struct utsname buf; 1009 struct utsname buf;
… …
565} 1038}
566 1039
567/*****************************************************************************/ 1040/*****************************************************************************/
568 1041
569#if EV_AVOID_STDIO 1042#if EV_AVOID_STDIO
570static void noinline 1043static void noinline ecb_cold
571ev_printerr (const char *msg) 1044ev_printerr (const char *msg)
572{ 1045{
573 write (STDERR_FILENO, msg, strlen (msg)); 1046 write (STDERR_FILENO, msg, strlen (msg));
574} 1047}
575#endif 1048#endif
576 1049
577static void (*syserr_cb)(const char *msg); 1050static void (*syserr_cb)(const char *msg);
578 1051
579void 1052void ecb_cold
580ev_set_syserr_cb (void (*cb)(const char *msg)) 1053ev_set_syserr_cb (void (*cb)(const char *msg))
581{ 1054{
582 syserr_cb = cb; 1055 syserr_cb = cb;
583} 1056}
584 1057
585static void noinline 1058static void noinline ecb_cold
586ev_syserr (const char *msg) 1059ev_syserr (const char *msg)
587{ 1060{
588 if (!msg) 1061 if (!msg)
589 msg = "(libev) system error"; 1062 msg = "(libev) system error";
590 1063
… …
623#endif 1096#endif
624} 1097}
625 1098
626static void *(*alloc)(void *ptr, long size) = ev_realloc_emul; 1099static void *(*alloc)(void *ptr, long size) = ev_realloc_emul;
627 1100
628void 1101void ecb_cold
629ev_set_allocator (void *(*cb)(void *ptr, long size)) 1102ev_set_allocator (void *(*cb)(void *ptr, long size))
630{ 1103{
631 alloc = cb; 1104 alloc = cb;
632} 1105}
633 1106
… …
842 } 1315 }
843 1316
844 return ncur; 1317 return ncur;
845} 1318}
846 1319
847static noinline void * 1320static void * noinline ecb_cold
848array_realloc (int elem, void *base, int *cur, int cnt) 1321array_realloc (int elem, void *base, int *cur, int cnt)
849{ 1322{
850 *cur = array_nextsize (elem, *cur, cnt); 1323 *cur = array_nextsize (elem, *cur, cnt);
851 return ev_realloc (base, elem * *cur); 1324 return ev_realloc (base, elem * *cur);
852} 1325}
… …
855 memset ((void *)(base), 0, sizeof (*(base)) * (count)) 1328 memset ((void *)(base), 0, sizeof (*(base)) * (count))
856 1329
857#define array_needsize(type,base,cur,cnt,init) \ 1330#define array_needsize(type,base,cur,cnt,init) \
858 if (expect_false ((cnt) > (cur))) \ 1331 if (expect_false ((cnt) > (cur))) \
859 { \ 1332 { \
860 int ocur_ = (cur); \ 1333 int ecb_unused ocur_ = (cur); \
861 (base) = (type *)array_realloc \ 1334 (base) = (type *)array_realloc \
862 (sizeof (type), (base), &(cur), (cnt)); \ 1335 (sizeof (type), (base), &(cur), (cnt)); \
863 init ((base) + (ocur_), (cur) - ocur_); \ 1336 init ((base) + (ocur_), (cur) - ocur_); \
864 } 1337 }
865 1338
… …
965inline_size void 1438inline_size void
966fd_reify (EV_P) 1439fd_reify (EV_P)
967{ 1440{
968 int i; 1441 int i;
969 1442
1443#if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
1444 for (i = 0; i < fdchangecnt; ++i)
1445 {
1446 int fd = fdchanges [i];
1447 ANFD *anfd = anfds + fd;
1448
1449 if (anfd->reify & EV__IOFDSET && anfd->head)
1450 {
1451 SOCKET handle = EV_FD_TO_WIN32_HANDLE (fd);
1452
1453 if (handle != anfd->handle)
1454 {
1455 unsigned long arg;
1456
1457 assert (("libev: only socket fds supported in this configuration", ioctlsocket (handle, FIONREAD, &arg) == 0));
1458
1459 /* handle changed, but fd didn't - we need to do it in two steps */
1460 backend_modify (EV_A_ fd, anfd->events, 0);
1461 anfd->events = 0;
1462 anfd->handle = handle;
1463 }
1464 }
1465 }
1466#endif
1467
970 for (i = 0; i < fdchangecnt; ++i) 1468 for (i = 0; i < fdchangecnt; ++i)
971 { 1469 {
972 int fd = fdchanges [i]; 1470 int fd = fdchanges [i];
973 ANFD *anfd = anfds + fd; 1471 ANFD *anfd = anfds + fd;
974 ev_io *w; 1472 ev_io *w;
… …
976 unsigned char o_events = anfd->events; 1474 unsigned char o_events = anfd->events;
977 unsigned char o_reify = anfd->reify; 1475 unsigned char o_reify = anfd->reify;
978 1476
979 anfd->reify = 0; 1477 anfd->reify = 0;
980 1478
981#if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
982 if (o_reify & EV__IOFDSET)
983 {
984 unsigned long arg;
985 anfd->handle = EV_FD_TO_WIN32_HANDLE (fd);
986 assert (("libev: only socket fds supported in this configuration", ioctlsocket (anfd->handle, FIONREAD, &arg) == 0));
987 printf ("oi %d %x\n", fd, anfd->handle);//D
988 }
989#endif
990
991 /*if (expect_true (o_reify & EV_ANFD_REIFY)) probably a deoptimisation */ 1479 /*if (expect_true (o_reify & EV_ANFD_REIFY)) probably a deoptimisation */
992 { 1480 {
993 anfd->events = 0; 1481 anfd->events = 0;
994 1482
995 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next) 1483 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
… …
1020 fdchanges [fdchangecnt - 1] = fd; 1508 fdchanges [fdchangecnt - 1] = fd;
1021 } 1509 }
1022} 1510}
1023 1511
1024/* the given fd is invalid/unusable, so make sure it doesn't hurt us anymore */ 1512/* the given fd is invalid/unusable, so make sure it doesn't hurt us anymore */
1025inline_speed void 1513inline_speed void ecb_cold
1026fd_kill (EV_P_ int fd) 1514fd_kill (EV_P_ int fd)
1027{ 1515{
1028 ev_io *w; 1516 ev_io *w;
1029 1517
1030 while ((w = (ev_io *)anfds [fd].head)) 1518 while ((w = (ev_io *)anfds [fd].head))
… …
1033 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE); 1521 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
1034 } 1522 }
1035} 1523}
1036 1524
1037/* check whether the given fd is actually valid, for error recovery */ 1525/* check whether the given fd is actually valid, for error recovery */
1038inline_size int 1526inline_size int ecb_cold
1039fd_valid (int fd) 1527fd_valid (int fd)
1040{ 1528{
1041#ifdef _WIN32 1529#ifdef _WIN32
1042 return EV_FD_TO_WIN32_HANDLE (fd) != -1; 1530 return EV_FD_TO_WIN32_HANDLE (fd) != -1;
1043#else 1531#else
1044 return fcntl (fd, F_GETFD) != -1; 1532 return fcntl (fd, F_GETFD) != -1;
1045#endif 1533#endif
1046} 1534}
1047 1535
1048/* called on EBADF to verify fds */ 1536/* called on EBADF to verify fds */
1049static void noinline 1537static void noinline ecb_cold
1050fd_ebadf (EV_P) 1538fd_ebadf (EV_P)
1051{ 1539{
1052 int fd; 1540 int fd;
1053 1541
1054 for (fd = 0; fd < anfdmax; ++fd) 1542 for (fd = 0; fd < anfdmax; ++fd)
… …
1056 if (!fd_valid (fd) && errno == EBADF) 1544 if (!fd_valid (fd) && errno == EBADF)
1057 fd_kill (EV_A_ fd); 1545 fd_kill (EV_A_ fd);
1058} 1546}
1059 1547
1060/* called on ENOMEM in select/poll to kill some fds and retry */ 1548/* called on ENOMEM in select/poll to kill some fds and retry */
1061static void noinline 1549static void noinline ecb_cold
1062fd_enomem (EV_P) 1550fd_enomem (EV_P)
1063{ 1551{
1064 int fd; 1552 int fd;
1065 1553
1066 for (fd = anfdmax; fd--; ) 1554 for (fd = anfdmax; fd--; )
… …
1261 1749
1262/*****************************************************************************/ 1750/*****************************************************************************/
1263 1751
1264#if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE 1752#if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
1265 1753
1266static void noinline 1754static void noinline ecb_cold
1267evpipe_init (EV_P) 1755evpipe_init (EV_P)
1268{ 1756{
1269 if (!ev_is_active (&pipe_w)) 1757 if (!ev_is_active (&pipe_w))
1270 { 1758 {
1271# if EV_USE_EVENTFD 1759# if EV_USE_EVENTFD
… …
1293 ev_io_start (EV_A_ &pipe_w); 1781 ev_io_start (EV_A_ &pipe_w);
1294 ev_unref (EV_A); /* watcher should not keep loop alive */ 1782 ev_unref (EV_A); /* watcher should not keep loop alive */
1295 } 1783 }
1296} 1784}
1297 1785
1298inline_size void 1786inline_speed void
1299evpipe_write (EV_P_ EV_ATOMIC_T *flag) 1787evpipe_write (EV_P_ EV_ATOMIC_T *flag)
1300{ 1788{
1301 if (!*flag) 1789 if (expect_true (*flag))
1790 return;
1791
1792 *flag = 1;
1793
1794 ECB_MEMORY_FENCE_RELEASE; /* make sure flag is visible before the wakeup */
1795
1796 pipe_write_skipped = 1;
1797
1798 ECB_MEMORY_FENCE; /* make sure pipe_write_skipped is visible before we check pipe_write_wanted */
1799
1800 if (pipe_write_wanted)
1302 { 1801 {
1802 int old_errno;
1803
1804 pipe_write_skipped = 0; /* just an optimisation, no fence needed */
1805
1303 int old_errno = errno; /* save errno because write might clobber it */ 1806 old_errno = errno; /* save errno because write will clobber it */
1304 char dummy;
1305
1306 *flag = 1;
1307 1807
1308#if EV_USE_EVENTFD 1808#if EV_USE_EVENTFD
1309 if (evfd >= 0) 1809 if (evfd >= 0)
1310 { 1810 {
1311 uint64_t counter = 1; 1811 uint64_t counter = 1;
1312 write (evfd, &counter, sizeof (uint64_t)); 1812 write (evfd, &counter, sizeof (uint64_t));
1313 } 1813 }
1314 else 1814 else
1315#endif 1815#endif
1816 {
1316 /* win32 people keep sending patches that change this write() to send() */ 1817 /* win32 people keep sending patches that change this write() to send() */
1317 /* and then run away. but send() is wrong, it wants a socket handle on win32 */ 1818 /* and then run away. but send() is wrong, it wants a socket handle on win32 */
1318 /* so when you think this write should be a send instead, please find out */ 1819 /* so when you think this write should be a send instead, please find out */
1319 /* where your send() is from - it's definitely not the microsoft send, and */ 1820 /* where your send() is from - it's definitely not the microsoft send, and */
1320 /* tell me. thank you. */ 1821 /* tell me. thank you. */
1321 write (evpipe [1], &dummy, 1); 1822 write (evpipe [1], &(evpipe [1]), 1);
1823 }
1322 1824
1323 errno = old_errno; 1825 errno = old_errno;
1324 } 1826 }
1325} 1827}
1326 1828
… …
1329static void 1831static void
1330pipecb (EV_P_ ev_io *iow, int revents) 1832pipecb (EV_P_ ev_io *iow, int revents)
1331{ 1833{
1332 int i; 1834 int i;
1333 1835
1836 if (revents & EV_READ)
1837 {
1334#if EV_USE_EVENTFD 1838#if EV_USE_EVENTFD
1335 if (evfd >= 0) 1839 if (evfd >= 0)
1336 { 1840 {
1337 uint64_t counter; 1841 uint64_t counter;
1338 read (evfd, &counter, sizeof (uint64_t)); 1842 read (evfd, &counter, sizeof (uint64_t));
1339 } 1843 }
1340 else 1844 else
1341#endif 1845#endif
1342 { 1846 {
1343 char dummy; 1847 char dummy;
1344 /* see discussion in evpipe_write when you think this read should be recv in win32 */ 1848 /* see discussion in evpipe_write when you think this read should be recv in win32 */
1345 read (evpipe [0], &dummy, 1); 1849 read (evpipe [0], &dummy, 1);
1850 }
1346 } 1851 }
1347 1852
1853 pipe_write_skipped = 0;
1854
1855#if EV_SIGNAL_ENABLE
1348 if (sig_pending) 1856 if (sig_pending)
1349 { 1857 {
1350 sig_pending = 0; 1858 sig_pending = 0;
1351 1859
1352 for (i = EV_NSIG - 1; i--; ) 1860 for (i = EV_NSIG - 1; i--; )
1353 if (expect_false (signals [i].pending)) 1861 if (expect_false (signals [i].pending))
1354 ev_feed_signal_event (EV_A_ i + 1); 1862 ev_feed_signal_event (EV_A_ i + 1);
1355 } 1863 }
1864#endif
1356 1865
1357#if EV_ASYNC_ENABLE 1866#if EV_ASYNC_ENABLE
1358 if (async_pending) 1867 if (async_pending)
1359 { 1868 {
1360 async_pending = 0; 1869 async_pending = 0;
… …
1378 EV_P = signals [signum - 1].loop; 1887 EV_P = signals [signum - 1].loop;
1379 1888
1380 if (!EV_A) 1889 if (!EV_A)
1381 return; 1890 return;
1382#endif 1891#endif
1892
1893 if (!ev_active (&pipe_w))
1894 return;
1383 1895
1384 signals [signum - 1].pending = 1; 1896 signals [signum - 1].pending = 1;
1385 evpipe_write (EV_A_ &sig_pending); 1897 evpipe_write (EV_A_ &sig_pending);
1386} 1898}
1387 1899
… …
1519#endif 2031#endif
1520#if EV_USE_SELECT 2032#if EV_USE_SELECT
1521# include "ev_select.c" 2033# include "ev_select.c"
1522#endif 2034#endif
1523 2035
1524int 2036int ecb_cold
1525ev_version_major (void) 2037ev_version_major (void)
1526{ 2038{
1527 return EV_VERSION_MAJOR; 2039 return EV_VERSION_MAJOR;
1528} 2040}
1529 2041
1530int 2042int ecb_cold
1531ev_version_minor (void) 2043ev_version_minor (void)
1532{ 2044{
1533 return EV_VERSION_MINOR; 2045 return EV_VERSION_MINOR;
1534} 2046}
1535 2047
1536/* return true if we are running with elevated privileges and should ignore env variables */ 2048/* return true if we are running with elevated privileges and should ignore env variables */
1537int inline_size 2049int inline_size ecb_cold
1538enable_secure (void) 2050enable_secure (void)
1539{ 2051{
1540#ifdef _WIN32 2052#ifdef _WIN32
1541 return 0; 2053 return 0;
1542#else 2054#else
1543 return getuid () != geteuid () 2055 return getuid () != geteuid ()
1544 || getgid () != getegid (); 2056 || getgid () != getegid ();
1545#endif 2057#endif
1546} 2058}
1547 2059
1548unsigned int 2060unsigned int ecb_cold
1549ev_supported_backends (void) 2061ev_supported_backends (void)
1550{ 2062{
1551 unsigned int flags = 0; 2063 unsigned int flags = 0;
1552 2064
1553 if (EV_USE_PORT ) flags |= EVBACKEND_PORT; 2065 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
… …
1557 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT; 2069 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
1558 2070
1559 return flags; 2071 return flags;
1560} 2072}
1561 2073
1562unsigned int 2074unsigned int ecb_cold
1563ev_recommended_backends (void) 2075ev_recommended_backends (void)
1564{ 2076{
1565 unsigned int flags = ev_supported_backends (); 2077 unsigned int flags = ev_supported_backends ();
1566 2078
1567#ifndef __NetBSD__ 2079#ifndef __NetBSD__
… …
1579#endif 2091#endif
1580 2092
1581 return flags; 2093 return flags;
1582} 2094}
1583 2095
1584unsigned int 2096unsigned int ecb_cold
1585ev_embeddable_backends (void) 2097ev_embeddable_backends (void)
1586{ 2098{
1587 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT; 2099 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
1588 2100
1589 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */ 2101 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
… …
1634ev_userdata (EV_P) 2146ev_userdata (EV_P)
1635{ 2147{
1636 return userdata; 2148 return userdata;
1637} 2149}
1638 2150
2151void
1639void ev_set_invoke_pending_cb (EV_P_ void (*invoke_pending_cb)(EV_P)) 2152ev_set_invoke_pending_cb (EV_P_ void (*invoke_pending_cb)(EV_P))
1640{ 2153{
1641 invoke_cb = invoke_pending_cb; 2154 invoke_cb = invoke_pending_cb;
1642} 2155}
1643 2156
2157void
1644void ev_set_loop_release_cb (EV_P_ void (*release)(EV_P), void (*acquire)(EV_P)) 2158ev_set_loop_release_cb (EV_P_ void (*release)(EV_P), void (*acquire)(EV_P))
1645{ 2159{
1646 release_cb = release; 2160 release_cb = release;
1647 acquire_cb = acquire; 2161 acquire_cb = acquire;
1648} 2162}
1649#endif 2163#endif
1650 2164
1651/* initialise a loop structure, must be zero-initialised */ 2165/* initialise a loop structure, must be zero-initialised */
1652static void noinline 2166static void noinline ecb_cold
1653loop_init (EV_P_ unsigned int flags) 2167loop_init (EV_P_ unsigned int flags)
1654{ 2168{
1655 if (!backend) 2169 if (!backend)
1656 { 2170 {
1657 origflags = flags; 2171 origflags = flags;
… …
1685 if (!(flags & EVFLAG_NOENV) 2199 if (!(flags & EVFLAG_NOENV)
1686 && !enable_secure () 2200 && !enable_secure ()
1687 && getenv ("LIBEV_FLAGS")) 2201 && getenv ("LIBEV_FLAGS"))
1688 flags = atoi (getenv ("LIBEV_FLAGS")); 2202 flags = atoi (getenv ("LIBEV_FLAGS"));
1689 2203
1690 ev_rt_now = ev_time (); 2204 ev_rt_now = ev_time ();
1691 mn_now = get_clock (); 2205 mn_now = get_clock ();
1692 now_floor = mn_now; 2206 now_floor = mn_now;
1693 rtmn_diff = ev_rt_now - mn_now; 2207 rtmn_diff = ev_rt_now - mn_now;
1694#if EV_FEATURE_API 2208#if EV_FEATURE_API
1695 invoke_cb = ev_invoke_pending; 2209 invoke_cb = ev_invoke_pending;
1696#endif 2210#endif
1697 2211
1698 io_blocktime = 0.; 2212 io_blocktime = 0.;
1699 timeout_blocktime = 0.; 2213 timeout_blocktime = 0.;
1700 backend = 0; 2214 backend = 0;
1701 backend_fd = -1; 2215 backend_fd = -1;
1702 sig_pending = 0; 2216 sig_pending = 0;
1703#if EV_ASYNC_ENABLE 2217#if EV_ASYNC_ENABLE
1704 async_pending = 0; 2218 async_pending = 0;
1705#endif 2219#endif
2220 pipe_write_skipped = 0;
2221 pipe_write_wanted = 0;
1706#if EV_USE_INOTIFY 2222#if EV_USE_INOTIFY
1707 fs_fd = flags & EVFLAG_NOINOTIFY ? -1 : -2; 2223 fs_fd = flags & EVFLAG_NOINOTIFY ? -1 : -2;
1708#endif 2224#endif
1709#if EV_USE_SIGNALFD 2225#if EV_USE_SIGNALFD
1710 sigfd = flags & EVFLAG_SIGNALFD ? -2 : -1; 2226 sigfd = flags & EVFLAG_SIGNALFD ? -2 : -1;
1711#endif 2227#endif
1712 2228
1713 if (!(flags & EVBACKEND_MASK)) 2229 if (!(flags & EVBACKEND_MASK))
1714 flags |= ev_recommended_backends (); 2230 flags |= ev_recommended_backends ();
1715 2231
… …
1740#endif 2256#endif
1741 } 2257 }
1742} 2258}
1743 2259
1744/* free up a loop structure */ 2260/* free up a loop structure */
1745void 2261void ecb_cold
1746ev_loop_destroy (EV_P) 2262ev_loop_destroy (EV_P)
1747{ 2263{
1748 int i; 2264 int i;
1749 2265
1750#if EV_MULTIPLICITY 2266#if EV_MULTIPLICITY
… …
1880 infy_fork (EV_A); 2396 infy_fork (EV_A);
1881#endif 2397#endif
1882 2398
1883 if (ev_is_active (&pipe_w)) 2399 if (ev_is_active (&pipe_w))
1884 { 2400 {
1885 /* this "locks" the handlers against writing to the pipe */ 2401 /* pipe_write_wanted must be false now, so modifying fd vars should be safe */
1886 /* while we modify the fd vars */
1887 sig_pending = 1;
1888#if EV_ASYNC_ENABLE
1889 async_pending = 1;
1890#endif
1891 2402
1892 ev_ref (EV_A); 2403 ev_ref (EV_A);
1893 ev_io_stop (EV_A_ &pipe_w); 2404 ev_io_stop (EV_A_ &pipe_w);
1894 2405
1895#if EV_USE_EVENTFD 2406#if EV_USE_EVENTFD
… …
1913 postfork = 0; 2424 postfork = 0;
1914} 2425}
1915 2426
1916#if EV_MULTIPLICITY 2427#if EV_MULTIPLICITY
1917 2428
1918struct ev_loop * 2429struct ev_loop * ecb_cold
1919ev_loop_new (unsigned int flags) 2430ev_loop_new (unsigned int flags)
1920{ 2431{
1921 EV_P = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop)); 2432 EV_P = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
1922 2433
1923 memset (EV_A, 0, sizeof (struct ev_loop)); 2434 memset (EV_A, 0, sizeof (struct ev_loop));
… …
1931} 2442}
1932 2443
1933#endif /* multiplicity */ 2444#endif /* multiplicity */
1934 2445
1935#if EV_VERIFY 2446#if EV_VERIFY
1936static void noinline 2447static void noinline ecb_cold
1937verify_watcher (EV_P_ W w) 2448verify_watcher (EV_P_ W w)
1938{ 2449{
1939 assert (("libev: watcher has invalid priority", ABSPRI (w) >= 0 && ABSPRI (w) < NUMPRI)); 2450 assert (("libev: watcher has invalid priority", ABSPRI (w) >= 0 && ABSPRI (w) < NUMPRI));
1940 2451
1941 if (w->pending) 2452 if (w->pending)
1942 assert (("libev: pending watcher not on pending queue", pendings [ABSPRI (w)][w->pending - 1].w == w)); 2453 assert (("libev: pending watcher not on pending queue", pendings [ABSPRI (w)][w->pending - 1].w == w));
1943} 2454}
1944 2455
1945static void noinline 2456static void noinline ecb_cold
1946verify_heap (EV_P_ ANHE *heap, int N) 2457verify_heap (EV_P_ ANHE *heap, int N)
1947{ 2458{
1948 int i; 2459 int i;
1949 2460
1950 for (i = HEAP0; i < N + HEAP0; ++i) 2461 for (i = HEAP0; i < N + HEAP0; ++i)
… …
1955 2466
1956 verify_watcher (EV_A_ (W)ANHE_w (heap [i])); 2467 verify_watcher (EV_A_ (W)ANHE_w (heap [i]));
1957 } 2468 }
1958} 2469}
1959 2470
1960static void noinline 2471static void noinline ecb_cold
1961array_verify (EV_P_ W *ws, int cnt) 2472array_verify (EV_P_ W *ws, int cnt)
1962{ 2473{
1963 while (cnt--) 2474 while (cnt--)
1964 { 2475 {
1965 assert (("libev: active index mismatch", ev_active (ws [cnt]) == cnt + 1)); 2476 assert (("libev: active index mismatch", ev_active (ws [cnt]) == cnt + 1));
… …
1967 } 2478 }
1968} 2479}
1969#endif 2480#endif
1970 2481
1971#if EV_FEATURE_API 2482#if EV_FEATURE_API
1972void 2483void ecb_cold
1973ev_verify (EV_P) 2484ev_verify (EV_P)
1974{ 2485{
1975#if EV_VERIFY 2486#if EV_VERIFY
1976 int i; 2487 int i;
1977 WL w; 2488 WL w;
… …
2043#endif 2554#endif
2044} 2555}
2045#endif 2556#endif
2046 2557
2047#if EV_MULTIPLICITY 2558#if EV_MULTIPLICITY
2048struct ev_loop * 2559struct ev_loop * ecb_cold
2049#else 2560#else
2050int 2561int
2051#endif 2562#endif
2052ev_default_loop (unsigned int flags) 2563ev_default_loop (unsigned int flags)
2053{ 2564{
… …
2181 feed_reverse_done (EV_A_ EV_TIMER); 2692 feed_reverse_done (EV_A_ EV_TIMER);
2182 } 2693 }
2183} 2694}
2184 2695
2185#if EV_PERIODIC_ENABLE 2696#if EV_PERIODIC_ENABLE
2697
2698static void noinline
2699periodic_recalc (EV_P_ ev_periodic *w)
2700{
2701 ev_tstamp interval = w->interval > MIN_INTERVAL ? w->interval : MIN_INTERVAL;
2702 ev_tstamp at = w->offset + interval * ev_floor ((ev_rt_now - w->offset) / interval);
2703
2704 /* the above almost always errs on the low side */
2705 while (at <= ev_rt_now)
2706 {
2707 ev_tstamp nat = at + w->interval;
2708
2709 /* when resolution fails us, we use ev_rt_now */
2710 if (expect_false (nat == at))
2711 {
2712 at = ev_rt_now;
2713 break;
2714 }
2715
2716 at = nat;
2717 }
2718
2719 ev_at (w) = at;
2720}
2721
2186/* make periodics pending */ 2722/* make periodics pending */
2187inline_size void 2723inline_size void
2188periodics_reify (EV_P) 2724periodics_reify (EV_P)
2189{ 2725{
2190 EV_FREQUENT_CHECK; 2726 EV_FREQUENT_CHECK;
… …
2209 ANHE_at_cache (periodics [HEAP0]); 2745 ANHE_at_cache (periodics [HEAP0]);
2210 downheap (periodics, periodiccnt, HEAP0); 2746 downheap (periodics, periodiccnt, HEAP0);
2211 } 2747 }
2212 else if (w->interval) 2748 else if (w->interval)
2213 { 2749 {
2214 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval; 2750 periodic_recalc (EV_A_ w);
2215 /* if next trigger time is not sufficiently in the future, put it there */
2216 /* this might happen because of floating point inexactness */
2217 if (ev_at (w) - ev_rt_now < TIME_EPSILON)
2218 {
2219 ev_at (w) += w->interval;
2220
2221 /* if interval is unreasonably low we might still have a time in the past */
2222 /* so correct this. this will make the periodic very inexact, but the user */
2223 /* has effectively asked to get triggered more often than possible */
2224 if (ev_at (w) < ev_rt_now)
2225 ev_at (w) = ev_rt_now;
2226 }
2227
2228 ANHE_at_cache (periodics [HEAP0]); 2751 ANHE_at_cache (periodics [HEAP0]);
2229 downheap (periodics, periodiccnt, HEAP0); 2752 downheap (periodics, periodiccnt, HEAP0);
2230 } 2753 }
2231 else 2754 else
2232 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */ 2755 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
… …
2240 } 2763 }
2241} 2764}
2242 2765
2243/* simply recalculate all periodics */ 2766/* simply recalculate all periodics */
2244/* TODO: maybe ensure that at least one event happens when jumping forward? */ 2767/* TODO: maybe ensure that at least one event happens when jumping forward? */
2245static void noinline 2768static void noinline ecb_cold
2246periodics_reschedule (EV_P) 2769periodics_reschedule (EV_P)
2247{ 2770{
2248 int i; 2771 int i;
2249 2772
2250 /* adjust periodics after time jump */ 2773 /* adjust periodics after time jump */
… …
2253 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [i]); 2776 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [i]);
2254 2777
2255 if (w->reschedule_cb) 2778 if (w->reschedule_cb)
2256 ev_at (w) = w->reschedule_cb (w, ev_rt_now); 2779 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2257 else if (w->interval) 2780 else if (w->interval)
2258 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval; 2781 periodic_recalc (EV_A_ w);
2259 2782
2260 ANHE_at_cache (periodics [i]); 2783 ANHE_at_cache (periodics [i]);
2261 } 2784 }
2262 2785
2263 reheap (periodics, periodiccnt); 2786 reheap (periodics, periodiccnt);
2264} 2787}
2265#endif 2788#endif
2266 2789
2267/* adjust all timers by a given offset */ 2790/* adjust all timers by a given offset */
2268static void noinline 2791static void noinline ecb_cold
2269timers_reschedule (EV_P_ ev_tstamp adjust) 2792timers_reschedule (EV_P_ ev_tstamp adjust)
2270{ 2793{
2271 int i; 2794 int i;
2272 2795
2273 for (i = 0; i < timercnt; ++i) 2796 for (i = 0; i < timercnt; ++i)
… …
2310 * doesn't hurt either as we only do this on time-jumps or 2833 * doesn't hurt either as we only do this on time-jumps or
2311 * in the unlikely event of having been preempted here. 2834 * in the unlikely event of having been preempted here.
2312 */ 2835 */
2313 for (i = 4; --i; ) 2836 for (i = 4; --i; )
2314 { 2837 {
2838 ev_tstamp diff;
2315 rtmn_diff = ev_rt_now - mn_now; 2839 rtmn_diff = ev_rt_now - mn_now;
2316 2840
2841 diff = odiff - rtmn_diff;
2842
2317 if (expect_true (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)) 2843 if (expect_true ((diff < 0. ? -diff : diff) < MIN_TIMEJUMP))
2318 return; /* all is well */ 2844 return; /* all is well */
2319 2845
2320 ev_rt_now = ev_time (); 2846 ev_rt_now = ev_time ();
2321 mn_now = get_clock (); 2847 mn_now = get_clock ();
2322 now_floor = mn_now; 2848 now_floor = mn_now;
… …
2412 ev_tstamp prev_mn_now = mn_now; 2938 ev_tstamp prev_mn_now = mn_now;
2413 2939
2414 /* update time to cancel out callback processing overhead */ 2940 /* update time to cancel out callback processing overhead */
2415 time_update (EV_A_ 1e100); 2941 time_update (EV_A_ 1e100);
2416 2942
2943 /* from now on, we want a pipe-wake-up */
2944 pipe_write_wanted = 1;
2945
2946 ECB_MEMORY_FENCE; /* make sure pipe_write_wanted is visible before we check for potential skips */
2947
2417 if (expect_true (!(flags & EVRUN_NOWAIT || idleall || !activecnt))) 2948 if (expect_true (!(flags & EVRUN_NOWAIT || idleall || !activecnt || pipe_write_skipped)))
2418 { 2949 {
2419 waittime = MAX_BLOCKTIME; 2950 waittime = MAX_BLOCKTIME;
2420 2951
2421 if (timercnt) 2952 if (timercnt)
2422 { 2953 {
2423 ev_tstamp to = ANHE_at (timers [HEAP0]) - mn_now + backend_fudge; 2954 ev_tstamp to = ANHE_at (timers [HEAP0]) - mn_now;
2424 if (waittime > to) waittime = to; 2955 if (waittime > to) waittime = to;
2425 } 2956 }
2426 2957
2427#if EV_PERIODIC_ENABLE 2958#if EV_PERIODIC_ENABLE
2428 if (periodiccnt) 2959 if (periodiccnt)
2429 { 2960 {
2430 ev_tstamp to = ANHE_at (periodics [HEAP0]) - ev_rt_now + backend_fudge; 2961 ev_tstamp to = ANHE_at (periodics [HEAP0]) - ev_rt_now;
2431 if (waittime > to) waittime = to; 2962 if (waittime > to) waittime = to;
2432 } 2963 }
2433#endif 2964#endif
2434 2965
2435 /* don't let timeouts decrease the waittime below timeout_blocktime */ 2966 /* don't let timeouts decrease the waittime below timeout_blocktime */
2436 if (expect_false (waittime < timeout_blocktime)) 2967 if (expect_false (waittime < timeout_blocktime))
2437 waittime = timeout_blocktime; 2968 waittime = timeout_blocktime;
2969
2970 /* at this point, we NEED to wait, so we have to ensure */
2971 /* to pass a minimum nonzero value to the backend */
2972 if (expect_false (waittime < backend_mintime))
2973 waittime = backend_mintime;
2438 2974
2439 /* extra check because io_blocktime is commonly 0 */ 2975 /* extra check because io_blocktime is commonly 0 */
2440 if (expect_false (io_blocktime)) 2976 if (expect_false (io_blocktime))
2441 { 2977 {
2442 sleeptime = io_blocktime - (mn_now - prev_mn_now); 2978 sleeptime = io_blocktime - (mn_now - prev_mn_now);
2443 2979
2444 if (sleeptime > waittime - backend_fudge) 2980 if (sleeptime > waittime - backend_mintime)
2445 sleeptime = waittime - backend_fudge; 2981 sleeptime = waittime - backend_mintime;
2446 2982
2447 if (expect_true (sleeptime > 0.)) 2983 if (expect_true (sleeptime > 0.))
2448 { 2984 {
2449 ev_sleep (sleeptime); 2985 ev_sleep (sleeptime);
2450 waittime -= sleeptime; 2986 waittime -= sleeptime;
… …
2456 ++loop_count; 2992 ++loop_count;
2457#endif 2993#endif
2458 assert ((loop_done = EVBREAK_RECURSE, 1)); /* assert for side effect */ 2994 assert ((loop_done = EVBREAK_RECURSE, 1)); /* assert for side effect */
2459 backend_poll (EV_A_ waittime); 2995 backend_poll (EV_A_ waittime);
2460 assert ((loop_done = EVBREAK_CANCEL, 1)); /* assert for side effect */ 2996 assert ((loop_done = EVBREAK_CANCEL, 1)); /* assert for side effect */
2997
2998 pipe_write_wanted = 0; /* just an optimsiation, no fence needed */
2999
3000 if (pipe_write_skipped)
3001 {
3002 assert (("libev: pipe_w not active, but pipe not written", ev_is_active (&pipe_w)));
3003 ev_feed_event (EV_A_ &pipe_w, EV_CUSTOM);
3004 }
3005
2461 3006
2462 /* update ev_rt_now, do magic */ 3007 /* update ev_rt_now, do magic */
2463 time_update (EV_A_ waittime + sleeptime); 3008 time_update (EV_A_ waittime + sleeptime);
2464 } 3009 }
2465 3010
… …
2755 if (w->reschedule_cb) 3300 if (w->reschedule_cb)
2756 ev_at (w) = w->reschedule_cb (w, ev_rt_now); 3301 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2757 else if (w->interval) 3302 else if (w->interval)
2758 { 3303 {
2759 assert (("libev: ev_periodic_start called with negative interval value", w->interval >= 0.)); 3304 assert (("libev: ev_periodic_start called with negative interval value", w->interval >= 0.));
2760 /* this formula differs from the one in periodic_reify because we do not always round up */ 3305 periodic_recalc (EV_A_ w);
2761 ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
2762 } 3306 }
2763 else 3307 else
2764 ev_at (w) = w->offset; 3308 ev_at (w) = w->offset;
2765 3309
2766 EV_FREQUENT_CHECK; 3310 EV_FREQUENT_CHECK;
… …
3043 if (!pend || pend == path) 3587 if (!pend || pend == path)
3044 break; 3588 break;
3045 3589
3046 *pend = 0; 3590 *pend = 0;
3047 w->wd = inotify_add_watch (fs_fd, path, mask); 3591 w->wd = inotify_add_watch (fs_fd, path, mask);
3048 } 3592 }
3049 while (w->wd < 0 && (errno == ENOENT || errno == EACCES)); 3593 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
3050 } 3594 }
3051 } 3595 }
3052 3596
3053 if (w->wd >= 0) 3597 if (w->wd >= 0)
… …
3120 infy_wd (EV_A_ ev->wd, ev->wd, ev); 3664 infy_wd (EV_A_ ev->wd, ev->wd, ev);
3121 ofs += sizeof (struct inotify_event) + ev->len; 3665 ofs += sizeof (struct inotify_event) + ev->len;
3122 } 3666 }
3123} 3667}
3124 3668
3125inline_size void 3669inline_size void ecb_cold
3126ev_check_2625 (EV_P) 3670ev_check_2625 (EV_P)
3127{ 3671{
3128 /* kernels < 2.6.25 are borked 3672 /* kernels < 2.6.25 are borked
3129 * http://www.ussg.indiana.edu/hypermail/linux/kernel/0711.3/1208.html 3673 * http://www.ussg.indiana.edu/hypermail/linux/kernel/0711.3/1208.html
3130 */ 3674 */
… …
3755} 4299}
3756 4300
3757/*****************************************************************************/ 4301/*****************************************************************************/
3758 4302
3759#if EV_WALK_ENABLE 4303#if EV_WALK_ENABLE
3760void 4304void ecb_cold
3761ev_walk (EV_P_ int types, void (*cb)(EV_P_ int type, void *w)) 4305ev_walk (EV_P_ int types, void (*cb)(EV_P_ int type, void *w))
3762{ 4306{
3763 int i, j; 4307 int i, j;
3764 ev_watcher_list *wl, *wn; 4308 ev_watcher_list *wl, *wn;
3765 4309
… …
3809 cb (EV_A_ EV_PERIODIC, ANHE_w (periodics [i])); 4353 cb (EV_A_ EV_PERIODIC, ANHE_w (periodics [i]));
3810#endif 4354#endif
3811 4355
3812#if EV_IDLE_ENABLE 4356#if EV_IDLE_ENABLE
3813 if (types & EV_IDLE) 4357 if (types & EV_IDLE)
3814 for (j = NUMPRI; i--; ) 4358 for (j = NUMPRI; j--; )
3815 for (i = idlecnt [j]; i--; ) 4359 for (i = idlecnt [j]; i--; )
3816 cb (EV_A_ EV_IDLE, idles [j][i]); 4360 cb (EV_A_ EV_IDLE, idles [j][i]);
3817#endif 4361#endif
3818 4362
3819#if EV_FORK_ENABLE 4363#if EV_FORK_ENABLE

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