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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 1.407 by root, Wed Jan 25 01:32:12 2012 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 (©) 2009-2012 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__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
545 #if __i386 || __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 || __amd64__ || __x86_64 || __x86_64__
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 #elif __sparc || __sparc__
562 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad | " : : : "memory")
563 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
564 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
565 #endif
566 #endif
567#endif
568
569#ifndef ECB_MEMORY_FENCE
570 #if ECB_GCC_VERSION(4,4) || defined(__INTEL_COMPILER) || defined(__clang__)
571 #define ECB_MEMORY_FENCE __sync_synchronize ()
572 /*#define ECB_MEMORY_FENCE_ACQUIRE ({ char dummy = 0; __sync_lock_test_and_set (&dummy, 1); }) */
573 /*#define ECB_MEMORY_FENCE_RELEASE ({ char dummy = 1; __sync_lock_release (&dummy ); }) */
574 #elif _MSC_VER >= 1400 /* VC++ 2005 */
575 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
576 #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
577 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
578 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
579 #elif defined(_WIN32)
580 #include <WinNT.h>
581 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
582 #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
583 #include <mbarrier.h>
584 #define ECB_MEMORY_FENCE __machine_rw_barrier ()
585 #define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier ()
586 #define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier ()
587 #endif
588#endif
589
590#ifndef ECB_MEMORY_FENCE
591 #if !ECB_AVOID_PTHREADS
592 /*
593 * if you get undefined symbol references to pthread_mutex_lock,
594 * or failure to find pthread.h, then you should implement
595 * the ECB_MEMORY_FENCE operations for your cpu/compiler
596 * OR provide pthread.h and link against the posix thread library
597 * of your system.
598 */
599 #include <pthread.h>
600 #define ECB_NEEDS_PTHREADS 1
601 #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
602
603 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
604 #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
605 #endif
606#endif
607
608#if !defined(ECB_MEMORY_FENCE_ACQUIRE) && defined(ECB_MEMORY_FENCE)
609 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
610#endif
611
612#if !defined(ECB_MEMORY_FENCE_RELEASE) && defined(ECB_MEMORY_FENCE)
613 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
614#endif
615
616/*****************************************************************************/
617
618#define ECB_C99 (__STDC_VERSION__ >= 199901L)
619
620#if __cplusplus
621 #define ecb_inline static inline
622#elif ECB_GCC_VERSION(2,5)
623 #define ecb_inline static __inline__
624#elif ECB_C99
625 #define ecb_inline static inline
626#else
627 #define ecb_inline static
628#endif
629
630#if ECB_GCC_VERSION(3,3)
631 #define ecb_restrict __restrict__
632#elif ECB_C99
633 #define ecb_restrict restrict
634#else
635 #define ecb_restrict
636#endif
637
638typedef int ecb_bool;
639
640#define ECB_CONCAT_(a, b) a ## b
641#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
642#define ECB_STRINGIFY_(a) # a
643#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
644
645#define ecb_function_ ecb_inline
646
647#if ECB_GCC_VERSION(3,1)
648 #define ecb_attribute(attrlist) __attribute__(attrlist)
649 #define ecb_is_constant(expr) __builtin_constant_p (expr)
650 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
651 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
652#else
653 #define ecb_attribute(attrlist)
654 #define ecb_is_constant(expr) 0
655 #define ecb_expect(expr,value) (expr)
656 #define ecb_prefetch(addr,rw,locality)
657#endif
658
659/* no emulation for ecb_decltype */
660#if ECB_GCC_VERSION(4,5)
661 #define ecb_decltype(x) __decltype(x)
662#elif ECB_GCC_VERSION(3,0)
663 #define ecb_decltype(x) __typeof(x)
664#endif
665
666#define ecb_noinline ecb_attribute ((__noinline__))
667#define ecb_noreturn ecb_attribute ((__noreturn__))
668#define ecb_unused ecb_attribute ((__unused__))
669#define ecb_const ecb_attribute ((__const__))
670#define ecb_pure ecb_attribute ((__pure__))
671
672#if ECB_GCC_VERSION(4,3)
673 #define ecb_artificial ecb_attribute ((__artificial__))
674 #define ecb_hot ecb_attribute ((__hot__))
675 #define ecb_cold ecb_attribute ((__cold__))
676#else
677 #define ecb_artificial
678 #define ecb_hot
679 #define ecb_cold
680#endif
681
682/* put around conditional expressions if you are very sure that the */
683/* expression is mostly true or mostly false. note that these return */
684/* booleans, not the expression. */
474#define expect_false(expr) expect ((expr) != 0, 0) 685#define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
475#define expect_true(expr) expect ((expr) != 0, 1) 686#define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
687/* for compatibility to the rest of the world */
688#define ecb_likely(expr) ecb_expect_true (expr)
689#define ecb_unlikely(expr) ecb_expect_false (expr)
690
691/* count trailing zero bits and count # of one bits */
692#if ECB_GCC_VERSION(3,4)
693 /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
694 #define ecb_ld32(x) (__builtin_clz (x) ^ 31)
695 #define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
696 #define ecb_ctz32(x) __builtin_ctz (x)
697 #define ecb_ctz64(x) __builtin_ctzll (x)
698 #define ecb_popcount32(x) __builtin_popcount (x)
699 /* no popcountll */
700#else
701 ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const;
702 ecb_function_ int
703 ecb_ctz32 (uint32_t x)
704 {
705 int r = 0;
706
707 x &= ~x + 1; /* this isolates the lowest bit */
708
709#if ECB_branchless_on_i386
710 r += !!(x & 0xaaaaaaaa) << 0;
711 r += !!(x & 0xcccccccc) << 1;
712 r += !!(x & 0xf0f0f0f0) << 2;
713 r += !!(x & 0xff00ff00) << 3;
714 r += !!(x & 0xffff0000) << 4;
715#else
716 if (x & 0xaaaaaaaa) r += 1;
717 if (x & 0xcccccccc) r += 2;
718 if (x & 0xf0f0f0f0) r += 4;
719 if (x & 0xff00ff00) r += 8;
720 if (x & 0xffff0000) r += 16;
721#endif
722
723 return r;
724 }
725
726 ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const;
727 ecb_function_ int
728 ecb_ctz64 (uint64_t x)
729 {
730 int shift = x & 0xffffffffU ? 0 : 32;
731 return ecb_ctz32 (x >> shift) + shift;
732 }
733
734 ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const;
735 ecb_function_ int
736 ecb_popcount32 (uint32_t x)
737 {
738 x -= (x >> 1) & 0x55555555;
739 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
740 x = ((x >> 4) + x) & 0x0f0f0f0f;
741 x *= 0x01010101;
742
743 return x >> 24;
744 }
745
746 ecb_function_ int ecb_ld32 (uint32_t x) ecb_const;
747 ecb_function_ int ecb_ld32 (uint32_t x)
748 {
749 int r = 0;
750
751 if (x >> 16) { x >>= 16; r += 16; }
752 if (x >> 8) { x >>= 8; r += 8; }
753 if (x >> 4) { x >>= 4; r += 4; }
754 if (x >> 2) { x >>= 2; r += 2; }
755 if (x >> 1) { r += 1; }
756
757 return r;
758 }
759
760 ecb_function_ int ecb_ld64 (uint64_t x) ecb_const;
761 ecb_function_ int ecb_ld64 (uint64_t x)
762 {
763 int r = 0;
764
765 if (x >> 32) { x >>= 32; r += 32; }
766
767 return r + ecb_ld32 (x);
768 }
769#endif
770
771ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const;
772ecb_function_ uint8_t ecb_bitrev8 (uint8_t x)
773{
774 return ( (x * 0x0802U & 0x22110U)
775 | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
776}
777
778ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) ecb_const;
779ecb_function_ uint16_t ecb_bitrev16 (uint16_t x)
780{
781 x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1);
782 x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2);
783 x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4);
784 x = ( x >> 8 ) | ( x << 8);
785
786 return x;
787}
788
789ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) ecb_const;
790ecb_function_ uint32_t ecb_bitrev32 (uint32_t x)
791{
792 x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1);
793 x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2);
794 x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4);
795 x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8);
796 x = ( x >> 16 ) | ( x << 16);
797
798 return x;
799}
800
801/* popcount64 is only available on 64 bit cpus as gcc builtin */
802/* so for this version we are lazy */
803ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;
804ecb_function_ int
805ecb_popcount64 (uint64_t x)
806{
807 return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
808}
809
810ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) ecb_const;
811ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) ecb_const;
812ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const;
813ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const;
814ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
815ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
816ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const;
817ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const;
818
819ecb_inline uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }
820ecb_inline uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }
821ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }
822ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }
823ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
824ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
825ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
826ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }
827
828#if ECB_GCC_VERSION(4,3)
829 #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
830 #define ecb_bswap32(x) __builtin_bswap32 (x)
831 #define ecb_bswap64(x) __builtin_bswap64 (x)
832#else
833 ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const;
834 ecb_function_ uint16_t
835 ecb_bswap16 (uint16_t x)
836 {
837 return ecb_rotl16 (x, 8);
838 }
839
840 ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const;
841 ecb_function_ uint32_t
842 ecb_bswap32 (uint32_t x)
843 {
844 return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
845 }
846
847 ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const;
848 ecb_function_ uint64_t
849 ecb_bswap64 (uint64_t x)
850 {
851 return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
852 }
853#endif
854
855#if ECB_GCC_VERSION(4,5)
856 #define ecb_unreachable() __builtin_unreachable ()
857#else
858 /* this seems to work fine, but gcc always emits a warning for it :/ */
859 ecb_function_ void ecb_unreachable (void) ecb_noreturn;
860 ecb_function_ void ecb_unreachable (void) { }
861#endif
862
863/* try to tell the compiler that some condition is definitely true */
864#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
865
866ecb_function_ unsigned char ecb_byteorder_helper (void) ecb_const;
867ecb_function_ unsigned char
868ecb_byteorder_helper (void)
869{
870 const uint32_t u = 0x11223344;
871 return *(unsigned char *)&u;
872}
873
874ecb_function_ ecb_bool ecb_big_endian (void) ecb_const;
875ecb_function_ ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }
876ecb_function_ ecb_bool ecb_little_endian (void) ecb_const;
877ecb_function_ ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
878
879#if ECB_GCC_VERSION(3,0) || ECB_C99
880 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
881#else
882 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
883#endif
884
885#if __cplusplus
886 template<typename T>
887 static inline T ecb_div_rd (T val, T div)
888 {
889 return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
890 }
891 template<typename T>
892 static inline T ecb_div_ru (T val, T div)
893 {
894 return val < 0 ? - ((-val ) / div) : (val + div - 1) / div;
895 }
896#else
897 #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
898 #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
899#endif
900
901#if ecb_cplusplus_does_not_suck
902 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
903 template<typename T, int N>
904 static inline int ecb_array_length (const T (&arr)[N])
905 {
906 return N;
907 }
908#else
909 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
910#endif
911
912#endif
913
914/* ECB.H END */
915
916#if ECB_MEMORY_FENCE_NEEDS_PTHREADS
917/* if your architecture doesn't need memory fences, e.g. because it is
918 * single-cpu/core, or if you use libev in a project that doesn't use libev
919 * from multiple threads, then you can define ECB_AVOID_PTHREADS when compiling
920 * libev, in which cases the memory fences become nops.
921 * alternatively, you can remove this #error and link against libpthread,
922 * which will then provide the memory fences.
923 */
924# error "memory fences not defined for your architecture, please report"
925#endif
926
927#ifndef ECB_MEMORY_FENCE
928# define ECB_MEMORY_FENCE do { } while (0)
929# define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
930# define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
931#endif
932
933#define expect_false(cond) ecb_expect_false (cond)
934#define expect_true(cond) ecb_expect_true (cond)
935#define noinline ecb_noinline
936
476#define inline_size static inline 937#define inline_size ecb_inline
477 938
478#if EV_FEATURE_CODE 939#if EV_FEATURE_CODE
479# define inline_speed static inline 940# define inline_speed ecb_inline
480#else 941#else
481# define inline_speed static noinline 942# define inline_speed static noinline
482#endif 943#endif
483 944
484#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1) 945#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
523# include "ev_win32.c" 984# include "ev_win32.c"
524#endif 985#endif
525 986
526/*****************************************************************************/ 987/*****************************************************************************/
527 988
989/* define a suitable floor function (only used by periodics atm) */
990
991#if EV_USE_FLOOR
992# include <math.h>
993# define ev_floor(v) floor (v)
994#else
995
996#include <float.h>
997
998/* a floor() replacement function, should be independent of ev_tstamp type */
999static ev_tstamp noinline
1000ev_floor (ev_tstamp v)
1001{
1002 /* the choice of shift factor is not terribly important */
1003#if FLT_RADIX != 2 /* assume FLT_RADIX == 10 */
1004 const ev_tstamp shift = sizeof (unsigned long) >= 8 ? 10000000000000000000. : 1000000000.;
1005#else
1006 const ev_tstamp shift = sizeof (unsigned long) >= 8 ? 18446744073709551616. : 4294967296.;
1007#endif
1008
1009 /* argument too large for an unsigned long? */
1010 if (expect_false (v >= shift))
1011 {
1012 ev_tstamp f;
1013
1014 if (v == v - 1.)
1015 return v; /* very large number */
1016
1017 f = shift * ev_floor (v * (1. / shift));
1018 return f + ev_floor (v - f);
1019 }
1020
1021 /* special treatment for negative args? */
1022 if (expect_false (v < 0.))
1023 {
1024 ev_tstamp f = -ev_floor (-v);
1025
1026 return f - (f == v ? 0 : 1);
1027 }
1028
1029 /* fits into an unsigned long */
1030 return (unsigned long)v;
1031}
1032
1033#endif
1034
1035/*****************************************************************************/
1036
528#ifdef __linux 1037#ifdef __linux
529# include <sys/utsname.h> 1038# include <sys/utsname.h>
530#endif 1039#endif
531 1040
532static unsigned int noinline 1041static unsigned int noinline ecb_cold
533ev_linux_version (void) 1042ev_linux_version (void)
534{ 1043{
535#ifdef __linux 1044#ifdef __linux
536 unsigned int v = 0; 1045 unsigned int v = 0;
537 struct utsname buf; 1046 struct utsname buf;
566} 1075}
567 1076
568/*****************************************************************************/ 1077/*****************************************************************************/
569 1078
570#if EV_AVOID_STDIO 1079#if EV_AVOID_STDIO
571static void noinline 1080static void noinline ecb_cold
572ev_printerr (const char *msg) 1081ev_printerr (const char *msg)
573{ 1082{
574 write (STDERR_FILENO, msg, strlen (msg)); 1083 write (STDERR_FILENO, msg, strlen (msg));
575} 1084}
576#endif 1085#endif
577 1086
578static void (*syserr_cb)(const char *msg); 1087static void (*syserr_cb)(const char *msg);
579 1088
580void 1089void ecb_cold
581ev_set_syserr_cb (void (*cb)(const char *msg)) 1090ev_set_syserr_cb (void (*cb)(const char *msg))
582{ 1091{
583 syserr_cb = cb; 1092 syserr_cb = cb;
584} 1093}
585 1094
586static void noinline 1095static void noinline ecb_cold
587ev_syserr (const char *msg) 1096ev_syserr (const char *msg)
588{ 1097{
589 if (!msg) 1098 if (!msg)
590 msg = "(libev) system error"; 1099 msg = "(libev) system error";
591 1100
624#endif 1133#endif
625} 1134}
626 1135
627static void *(*alloc)(void *ptr, long size) = ev_realloc_emul; 1136static void *(*alloc)(void *ptr, long size) = ev_realloc_emul;
628 1137
629void 1138void ecb_cold
630ev_set_allocator (void *(*cb)(void *ptr, long size)) 1139ev_set_allocator (void *(*cb)(void *ptr, long size))
631{ 1140{
632 alloc = cb; 1141 alloc = cb;
633} 1142}
634 1143
723 #undef VAR 1232 #undef VAR
724 }; 1233 };
725 #include "ev_wrap.h" 1234 #include "ev_wrap.h"
726 1235
727 static struct ev_loop default_loop_struct; 1236 static struct ev_loop default_loop_struct;
728 struct ev_loop *ev_default_loop_ptr; 1237 EV_API_DECL struct ev_loop *ev_default_loop_ptr = 0; /* needs to be initialised to make it a definition despite extern */
729 1238
730#else 1239#else
731 1240
732 ev_tstamp ev_rt_now; 1241 EV_API_DECL ev_tstamp ev_rt_now = 0; /* needs to be initialised to make it a definition despite extern */
733 #define VAR(name,decl) static decl; 1242 #define VAR(name,decl) static decl;
734 #include "ev_vars.h" 1243 #include "ev_vars.h"
735 #undef VAR 1244 #undef VAR
736 1245
737 static int ev_default_loop_ptr; 1246 static int ev_default_loop_ptr;
816 select (0, 0, 0, 0, &tv); 1325 select (0, 0, 0, 0, &tv);
817#endif 1326#endif
818 } 1327 }
819} 1328}
820 1329
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/*****************************************************************************/ 1330/*****************************************************************************/
830 1331
831#define MALLOC_ROUND 4096 /* prefer to allocate in chunks of this size, must be 2**n and >> 4 longs */ 1332#define MALLOC_ROUND 4096 /* prefer to allocate in chunks of this size, must be 2**n and >> 4 longs */
832 1333
833/* find a suitable new size for the given array, */ 1334/* find a suitable new size for the given array, */
839 1340
840 do 1341 do
841 ncur <<= 1; 1342 ncur <<= 1;
842 while (cnt > ncur); 1343 while (cnt > ncur);
843 1344
844 /* if size is large, round to MALLOC_ROUND - 4 * longs to accomodate malloc overhead */ 1345 /* if size is large, round to MALLOC_ROUND - 4 * longs to accommodate malloc overhead */
845 if (elem * ncur > MALLOC_ROUND - sizeof (void *) * 4) 1346 if (elem * ncur > MALLOC_ROUND - sizeof (void *) * 4)
846 { 1347 {
847 ncur *= elem; 1348 ncur *= elem;
848 ncur = (ncur + elem + (MALLOC_ROUND - 1) + sizeof (void *) * 4) & ~(MALLOC_ROUND - 1); 1349 ncur = (ncur + elem + (MALLOC_ROUND - 1) + sizeof (void *) * 4) & ~(MALLOC_ROUND - 1);
849 ncur = ncur - sizeof (void *) * 4; 1350 ncur = ncur - sizeof (void *) * 4;
851 } 1352 }
852 1353
853 return ncur; 1354 return ncur;
854} 1355}
855 1356
856static noinline void * 1357static void * noinline ecb_cold
857array_realloc (int elem, void *base, int *cur, int cnt) 1358array_realloc (int elem, void *base, int *cur, int cnt)
858{ 1359{
859 *cur = array_nextsize (elem, *cur, cnt); 1360 *cur = array_nextsize (elem, *cur, cnt);
860 return ev_realloc (base, elem * *cur); 1361 return ev_realloc (base, elem * *cur);
861} 1362}
864 memset ((void *)(base), 0, sizeof (*(base)) * (count)) 1365 memset ((void *)(base), 0, sizeof (*(base)) * (count))
865 1366
866#define array_needsize(type,base,cur,cnt,init) \ 1367#define array_needsize(type,base,cur,cnt,init) \
867 if (expect_false ((cnt) > (cur))) \ 1368 if (expect_false ((cnt) > (cur))) \
868 { \ 1369 { \
869 int ocur_ = (cur); \ 1370 int ecb_unused ocur_ = (cur); \
870 (base) = (type *)array_realloc \ 1371 (base) = (type *)array_realloc \
871 (sizeof (type), (base), &(cur), (cnt)); \ 1372 (sizeof (type), (base), &(cur), (cnt)); \
872 init ((base) + (ocur_), (cur) - ocur_); \ 1373 init ((base) + (ocur_), (cur) - ocur_); \
873 } 1374 }
874 1375
980 for (i = 0; i < fdchangecnt; ++i) 1481 for (i = 0; i < fdchangecnt; ++i)
981 { 1482 {
982 int fd = fdchanges [i]; 1483 int fd = fdchanges [i];
983 ANFD *anfd = anfds + fd; 1484 ANFD *anfd = anfds + fd;
984 1485
985 if (anfd->reify & EV__IOFDSET) 1486 if (anfd->reify & EV__IOFDSET && anfd->head)
986 { 1487 {
987 SOCKET handle = EV_FD_TO_WIN32_HANDLE (fd); 1488 SOCKET handle = EV_FD_TO_WIN32_HANDLE (fd);
988 1489
989 if (handle != anfd->handle) 1490 if (handle != anfd->handle)
990 { 1491 {
1044 fdchanges [fdchangecnt - 1] = fd; 1545 fdchanges [fdchangecnt - 1] = fd;
1045 } 1546 }
1046} 1547}
1047 1548
1048/* the given fd is invalid/unusable, so make sure it doesn't hurt us anymore */ 1549/* the given fd is invalid/unusable, so make sure it doesn't hurt us anymore */
1049inline_speed void 1550inline_speed void ecb_cold
1050fd_kill (EV_P_ int fd) 1551fd_kill (EV_P_ int fd)
1051{ 1552{
1052 ev_io *w; 1553 ev_io *w;
1053 1554
1054 while ((w = (ev_io *)anfds [fd].head)) 1555 while ((w = (ev_io *)anfds [fd].head))
1057 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE); 1558 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
1058 } 1559 }
1059} 1560}
1060 1561
1061/* check whether the given fd is actually valid, for error recovery */ 1562/* check whether the given fd is actually valid, for error recovery */
1062inline_size int 1563inline_size int ecb_cold
1063fd_valid (int fd) 1564fd_valid (int fd)
1064{ 1565{
1065#ifdef _WIN32 1566#ifdef _WIN32
1066 return EV_FD_TO_WIN32_HANDLE (fd) != -1; 1567 return EV_FD_TO_WIN32_HANDLE (fd) != -1;
1067#else 1568#else
1068 return fcntl (fd, F_GETFD) != -1; 1569 return fcntl (fd, F_GETFD) != -1;
1069#endif 1570#endif
1070} 1571}
1071 1572
1072/* called on EBADF to verify fds */ 1573/* called on EBADF to verify fds */
1073static void noinline 1574static void noinline ecb_cold
1074fd_ebadf (EV_P) 1575fd_ebadf (EV_P)
1075{ 1576{
1076 int fd; 1577 int fd;
1077 1578
1078 for (fd = 0; fd < anfdmax; ++fd) 1579 for (fd = 0; fd < anfdmax; ++fd)
1080 if (!fd_valid (fd) && errno == EBADF) 1581 if (!fd_valid (fd) && errno == EBADF)
1081 fd_kill (EV_A_ fd); 1582 fd_kill (EV_A_ fd);
1082} 1583}
1083 1584
1084/* called on ENOMEM in select/poll to kill some fds and retry */ 1585/* called on ENOMEM in select/poll to kill some fds and retry */
1085static void noinline 1586static void noinline ecb_cold
1086fd_enomem (EV_P) 1587fd_enomem (EV_P)
1087{ 1588{
1088 int fd; 1589 int fd;
1089 1590
1090 for (fd = anfdmax; fd--; ) 1591 for (fd = anfdmax; fd--; )
1285 1786
1286/*****************************************************************************/ 1787/*****************************************************************************/
1287 1788
1288#if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE 1789#if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
1289 1790
1290static void noinline 1791static void noinline ecb_cold
1291evpipe_init (EV_P) 1792evpipe_init (EV_P)
1292{ 1793{
1293 if (!ev_is_active (&pipe_w)) 1794 if (!ev_is_active (&pipe_w))
1294 { 1795 {
1295# if EV_USE_EVENTFD 1796# if EV_USE_EVENTFD
1317 ev_io_start (EV_A_ &pipe_w); 1818 ev_io_start (EV_A_ &pipe_w);
1318 ev_unref (EV_A); /* watcher should not keep loop alive */ 1819 ev_unref (EV_A); /* watcher should not keep loop alive */
1319 } 1820 }
1320} 1821}
1321 1822
1322inline_size void 1823inline_speed void
1323evpipe_write (EV_P_ EV_ATOMIC_T *flag) 1824evpipe_write (EV_P_ EV_ATOMIC_T *flag)
1324{ 1825{
1325 if (!*flag) 1826 if (expect_true (*flag))
1827 return;
1828
1829 *flag = 1;
1830
1831 ECB_MEMORY_FENCE_RELEASE; /* make sure flag is visible before the wakeup */
1832
1833 pipe_write_skipped = 1;
1834
1835 ECB_MEMORY_FENCE; /* make sure pipe_write_skipped is visible before we check pipe_write_wanted */
1836
1837 if (pipe_write_wanted)
1326 { 1838 {
1839 int old_errno;
1840
1841 pipe_write_skipped = 0; /* just an optimisation, no fence needed */
1842
1327 int old_errno = errno; /* save errno because write might clobber it */ 1843 old_errno = errno; /* save errno because write will clobber it */
1328 char dummy;
1329
1330 *flag = 1;
1331 1844
1332#if EV_USE_EVENTFD 1845#if EV_USE_EVENTFD
1333 if (evfd >= 0) 1846 if (evfd >= 0)
1334 { 1847 {
1335 uint64_t counter = 1; 1848 uint64_t counter = 1;
1336 write (evfd, &counter, sizeof (uint64_t)); 1849 write (evfd, &counter, sizeof (uint64_t));
1337 } 1850 }
1338 else 1851 else
1339#endif 1852#endif
1853 {
1340 /* win32 people keep sending patches that change this write() to send() */ 1854 /* 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 */ 1855 /* 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 */ 1856 /* 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 */ 1857 /* where your send() is from - it's definitely not the microsoft send, and */
1344 /* tell me. thank you. */ 1858 /* tell me. thank you. */
1345 write (evpipe [1], &dummy, 1); 1859 write (evpipe [1], &(evpipe [1]), 1);
1860 }
1346 1861
1347 errno = old_errno; 1862 errno = old_errno;
1348 } 1863 }
1349} 1864}
1350 1865
1353static void 1868static void
1354pipecb (EV_P_ ev_io *iow, int revents) 1869pipecb (EV_P_ ev_io *iow, int revents)
1355{ 1870{
1356 int i; 1871 int i;
1357 1872
1873 if (revents & EV_READ)
1874 {
1358#if EV_USE_EVENTFD 1875#if EV_USE_EVENTFD
1359 if (evfd >= 0) 1876 if (evfd >= 0)
1360 { 1877 {
1361 uint64_t counter; 1878 uint64_t counter;
1362 read (evfd, &counter, sizeof (uint64_t)); 1879 read (evfd, &counter, sizeof (uint64_t));
1363 } 1880 }
1364 else 1881 else
1365#endif 1882#endif
1366 { 1883 {
1367 char dummy; 1884 char dummy;
1368 /* see discussion in evpipe_write when you think this read should be recv in win32 */ 1885 /* see discussion in evpipe_write when you think this read should be recv in win32 */
1369 read (evpipe [0], &dummy, 1); 1886 read (evpipe [0], &dummy, 1);
1887 }
1370 } 1888 }
1889
1890 pipe_write_skipped = 0;
1371 1891
1372#if EV_SIGNAL_ENABLE 1892#if EV_SIGNAL_ENABLE
1373 if (sig_pending) 1893 if (sig_pending)
1374 { 1894 {
1375 sig_pending = 0; 1895 sig_pending = 0;
1376 1896
1377 for (i = EV_NSIG - 1; i--; ) 1897 for (i = EV_NSIG - 1; i--; )
1378 if (expect_false (signals [i].pending)) 1898 if (expect_false (signals [i].pending))
1379 ev_feed_signal_event (EV_A_ i + 1); 1899 ev_feed_signal_event (EV_A_ i + 1);
1404 EV_P = signals [signum - 1].loop; 1924 EV_P = signals [signum - 1].loop;
1405 1925
1406 if (!EV_A) 1926 if (!EV_A)
1407 return; 1927 return;
1408#endif 1928#endif
1929
1930 if (!ev_active (&pipe_w))
1931 return;
1409 1932
1410 signals [signum - 1].pending = 1; 1933 signals [signum - 1].pending = 1;
1411 evpipe_write (EV_A_ &sig_pending); 1934 evpipe_write (EV_A_ &sig_pending);
1412} 1935}
1413 1936
1545#endif 2068#endif
1546#if EV_USE_SELECT 2069#if EV_USE_SELECT
1547# include "ev_select.c" 2070# include "ev_select.c"
1548#endif 2071#endif
1549 2072
1550int 2073int ecb_cold
1551ev_version_major (void) 2074ev_version_major (void)
1552{ 2075{
1553 return EV_VERSION_MAJOR; 2076 return EV_VERSION_MAJOR;
1554} 2077}
1555 2078
1556int 2079int ecb_cold
1557ev_version_minor (void) 2080ev_version_minor (void)
1558{ 2081{
1559 return EV_VERSION_MINOR; 2082 return EV_VERSION_MINOR;
1560} 2083}
1561 2084
1562/* return true if we are running with elevated privileges and should ignore env variables */ 2085/* return true if we are running with elevated privileges and should ignore env variables */
1563int inline_size 2086int inline_size ecb_cold
1564enable_secure (void) 2087enable_secure (void)
1565{ 2088{
1566#ifdef _WIN32 2089#ifdef _WIN32
1567 return 0; 2090 return 0;
1568#else 2091#else
1569 return getuid () != geteuid () 2092 return getuid () != geteuid ()
1570 || getgid () != getegid (); 2093 || getgid () != getegid ();
1571#endif 2094#endif
1572} 2095}
1573 2096
1574unsigned int 2097unsigned int ecb_cold
1575ev_supported_backends (void) 2098ev_supported_backends (void)
1576{ 2099{
1577 unsigned int flags = 0; 2100 unsigned int flags = 0;
1578 2101
1579 if (EV_USE_PORT ) flags |= EVBACKEND_PORT; 2102 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
1583 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT; 2106 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
1584 2107
1585 return flags; 2108 return flags;
1586} 2109}
1587 2110
1588unsigned int 2111unsigned int ecb_cold
1589ev_recommended_backends (void) 2112ev_recommended_backends (void)
1590{ 2113{
1591 unsigned int flags = ev_supported_backends (); 2114 unsigned int flags = ev_supported_backends ();
1592 2115
1593#ifndef __NetBSD__ 2116#ifndef __NetBSD__
1605#endif 2128#endif
1606 2129
1607 return flags; 2130 return flags;
1608} 2131}
1609 2132
1610unsigned int 2133unsigned int ecb_cold
1611ev_embeddable_backends (void) 2134ev_embeddable_backends (void)
1612{ 2135{
1613 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT; 2136 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
1614 2137
1615 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */ 2138 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
1660ev_userdata (EV_P) 2183ev_userdata (EV_P)
1661{ 2184{
1662 return userdata; 2185 return userdata;
1663} 2186}
1664 2187
2188void
1665void ev_set_invoke_pending_cb (EV_P_ void (*invoke_pending_cb)(EV_P)) 2189ev_set_invoke_pending_cb (EV_P_ void (*invoke_pending_cb)(EV_P))
1666{ 2190{
1667 invoke_cb = invoke_pending_cb; 2191 invoke_cb = invoke_pending_cb;
1668} 2192}
1669 2193
2194void
1670void ev_set_loop_release_cb (EV_P_ void (*release)(EV_P), void (*acquire)(EV_P)) 2195ev_set_loop_release_cb (EV_P_ void (*release)(EV_P), void (*acquire)(EV_P))
1671{ 2196{
1672 release_cb = release; 2197 release_cb = release;
1673 acquire_cb = acquire; 2198 acquire_cb = acquire;
1674} 2199}
1675#endif 2200#endif
1676 2201
1677/* initialise a loop structure, must be zero-initialised */ 2202/* initialise a loop structure, must be zero-initialised */
1678static void noinline 2203static void noinline ecb_cold
1679loop_init (EV_P_ unsigned int flags) 2204loop_init (EV_P_ unsigned int flags)
1680{ 2205{
1681 if (!backend) 2206 if (!backend)
1682 { 2207 {
1683 origflags = flags; 2208 origflags = flags;
1711 if (!(flags & EVFLAG_NOENV) 2236 if (!(flags & EVFLAG_NOENV)
1712 && !enable_secure () 2237 && !enable_secure ()
1713 && getenv ("LIBEV_FLAGS")) 2238 && getenv ("LIBEV_FLAGS"))
1714 flags = atoi (getenv ("LIBEV_FLAGS")); 2239 flags = atoi (getenv ("LIBEV_FLAGS"));
1715 2240
1716 ev_rt_now = ev_time (); 2241 ev_rt_now = ev_time ();
1717 mn_now = get_clock (); 2242 mn_now = get_clock ();
1718 now_floor = mn_now; 2243 now_floor = mn_now;
1719 rtmn_diff = ev_rt_now - mn_now; 2244 rtmn_diff = ev_rt_now - mn_now;
1720#if EV_FEATURE_API 2245#if EV_FEATURE_API
1721 invoke_cb = ev_invoke_pending; 2246 invoke_cb = ev_invoke_pending;
1722#endif 2247#endif
1723 2248
1724 io_blocktime = 0.; 2249 io_blocktime = 0.;
1725 timeout_blocktime = 0.; 2250 timeout_blocktime = 0.;
1726 backend = 0; 2251 backend = 0;
1727 backend_fd = -1; 2252 backend_fd = -1;
1728 sig_pending = 0; 2253 sig_pending = 0;
1729#if EV_ASYNC_ENABLE 2254#if EV_ASYNC_ENABLE
1730 async_pending = 0; 2255 async_pending = 0;
1731#endif 2256#endif
2257 pipe_write_skipped = 0;
2258 pipe_write_wanted = 0;
1732#if EV_USE_INOTIFY 2259#if EV_USE_INOTIFY
1733 fs_fd = flags & EVFLAG_NOINOTIFY ? -1 : -2; 2260 fs_fd = flags & EVFLAG_NOINOTIFY ? -1 : -2;
1734#endif 2261#endif
1735#if EV_USE_SIGNALFD 2262#if EV_USE_SIGNALFD
1736 sigfd = flags & EVFLAG_SIGNALFD ? -2 : -1; 2263 sigfd = flags & EVFLAG_SIGNALFD ? -2 : -1;
1737#endif 2264#endif
1738 2265
1739 if (!(flags & EVBACKEND_MASK)) 2266 if (!(flags & EVBACKEND_MASK))
1740 flags |= ev_recommended_backends (); 2267 flags |= ev_recommended_backends ();
1741 2268
1766#endif 2293#endif
1767 } 2294 }
1768} 2295}
1769 2296
1770/* free up a loop structure */ 2297/* free up a loop structure */
1771void 2298void ecb_cold
1772ev_loop_destroy (EV_P) 2299ev_loop_destroy (EV_P)
1773{ 2300{
1774 int i; 2301 int i;
1775 2302
1776#if EV_MULTIPLICITY 2303#if EV_MULTIPLICITY
1906 infy_fork (EV_A); 2433 infy_fork (EV_A);
1907#endif 2434#endif
1908 2435
1909 if (ev_is_active (&pipe_w)) 2436 if (ev_is_active (&pipe_w))
1910 { 2437 {
1911 /* this "locks" the handlers against writing to the pipe */ 2438 /* 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 2439
1918 ev_ref (EV_A); 2440 ev_ref (EV_A);
1919 ev_io_stop (EV_A_ &pipe_w); 2441 ev_io_stop (EV_A_ &pipe_w);
1920 2442
1921#if EV_USE_EVENTFD 2443#if EV_USE_EVENTFD
1939 postfork = 0; 2461 postfork = 0;
1940} 2462}
1941 2463
1942#if EV_MULTIPLICITY 2464#if EV_MULTIPLICITY
1943 2465
1944struct ev_loop * 2466struct ev_loop * ecb_cold
1945ev_loop_new (unsigned int flags) 2467ev_loop_new (unsigned int flags)
1946{ 2468{
1947 EV_P = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop)); 2469 EV_P = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
1948 2470
1949 memset (EV_A, 0, sizeof (struct ev_loop)); 2471 memset (EV_A, 0, sizeof (struct ev_loop));
1957} 2479}
1958 2480
1959#endif /* multiplicity */ 2481#endif /* multiplicity */
1960 2482
1961#if EV_VERIFY 2483#if EV_VERIFY
1962static void noinline 2484static void noinline ecb_cold
1963verify_watcher (EV_P_ W w) 2485verify_watcher (EV_P_ W w)
1964{ 2486{
1965 assert (("libev: watcher has invalid priority", ABSPRI (w) >= 0 && ABSPRI (w) < NUMPRI)); 2487 assert (("libev: watcher has invalid priority", ABSPRI (w) >= 0 && ABSPRI (w) < NUMPRI));
1966 2488
1967 if (w->pending) 2489 if (w->pending)
1968 assert (("libev: pending watcher not on pending queue", pendings [ABSPRI (w)][w->pending - 1].w == w)); 2490 assert (("libev: pending watcher not on pending queue", pendings [ABSPRI (w)][w->pending - 1].w == w));
1969} 2491}
1970 2492
1971static void noinline 2493static void noinline ecb_cold
1972verify_heap (EV_P_ ANHE *heap, int N) 2494verify_heap (EV_P_ ANHE *heap, int N)
1973{ 2495{
1974 int i; 2496 int i;
1975 2497
1976 for (i = HEAP0; i < N + HEAP0; ++i) 2498 for (i = HEAP0; i < N + HEAP0; ++i)
1981 2503
1982 verify_watcher (EV_A_ (W)ANHE_w (heap [i])); 2504 verify_watcher (EV_A_ (W)ANHE_w (heap [i]));
1983 } 2505 }
1984} 2506}
1985 2507
1986static void noinline 2508static void noinline ecb_cold
1987array_verify (EV_P_ W *ws, int cnt) 2509array_verify (EV_P_ W *ws, int cnt)
1988{ 2510{
1989 while (cnt--) 2511 while (cnt--)
1990 { 2512 {
1991 assert (("libev: active index mismatch", ev_active (ws [cnt]) == cnt + 1)); 2513 assert (("libev: active index mismatch", ev_active (ws [cnt]) == cnt + 1));
1993 } 2515 }
1994} 2516}
1995#endif 2517#endif
1996 2518
1997#if EV_FEATURE_API 2519#if EV_FEATURE_API
1998void 2520void ecb_cold
1999ev_verify (EV_P) 2521ev_verify (EV_P)
2000{ 2522{
2001#if EV_VERIFY 2523#if EV_VERIFY
2002 int i; 2524 int i;
2003 WL w; 2525 WL w;
2069#endif 2591#endif
2070} 2592}
2071#endif 2593#endif
2072 2594
2073#if EV_MULTIPLICITY 2595#if EV_MULTIPLICITY
2074struct ev_loop * 2596struct ev_loop * ecb_cold
2075#else 2597#else
2076int 2598int
2077#endif 2599#endif
2078ev_default_loop (unsigned int flags) 2600ev_default_loop (unsigned int flags)
2079{ 2601{
2208 } 2730 }
2209} 2731}
2210 2732
2211#if EV_PERIODIC_ENABLE 2733#if EV_PERIODIC_ENABLE
2212 2734
2213inline_speed void 2735static void noinline
2214periodic_recalc (EV_P_ ev_periodic *w) 2736periodic_recalc (EV_P_ ev_periodic *w)
2215{ 2737{
2216 /* TODO: use slow but potentially more correct incremental algo, */ 2738 ev_tstamp interval = w->interval > MIN_INTERVAL ? w->interval : MIN_INTERVAL;
2217 /* also do not rely on ceil */ 2739 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; 2740
2741 /* the above almost always errs on the low side */
2742 while (at <= ev_rt_now)
2743 {
2744 ev_tstamp nat = at + w->interval;
2745
2746 /* when resolution fails us, we use ev_rt_now */
2747 if (expect_false (nat == at))
2748 {
2749 at = ev_rt_now;
2750 break;
2751 }
2752
2753 at = nat;
2754 }
2755
2756 ev_at (w) = at;
2219} 2757}
2220 2758
2221/* make periodics pending */ 2759/* make periodics pending */
2222inline_size void 2760inline_size void
2223periodics_reify (EV_P) 2761periodics_reify (EV_P)
2245 downheap (periodics, periodiccnt, HEAP0); 2783 downheap (periodics, periodiccnt, HEAP0);
2246 } 2784 }
2247 else if (w->interval) 2785 else if (w->interval)
2248 { 2786 {
2249 periodic_recalc (EV_A_ w); 2787 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]); 2788 ANHE_at_cache (periodics [HEAP0]);
2265 downheap (periodics, periodiccnt, HEAP0); 2789 downheap (periodics, periodiccnt, HEAP0);
2266 } 2790 }
2267 else 2791 else
2268 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */ 2792 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
2276 } 2800 }
2277} 2801}
2278 2802
2279/* simply recalculate all periodics */ 2803/* simply recalculate all periodics */
2280/* TODO: maybe ensure that at least one event happens when jumping forward? */ 2804/* TODO: maybe ensure that at least one event happens when jumping forward? */
2281static void noinline 2805static void noinline ecb_cold
2282periodics_reschedule (EV_P) 2806periodics_reschedule (EV_P)
2283{ 2807{
2284 int i; 2808 int i;
2285 2809
2286 /* adjust periodics after time jump */ 2810 /* adjust periodics after time jump */
2299 reheap (periodics, periodiccnt); 2823 reheap (periodics, periodiccnt);
2300} 2824}
2301#endif 2825#endif
2302 2826
2303/* adjust all timers by a given offset */ 2827/* adjust all timers by a given offset */
2304static void noinline 2828static void noinline ecb_cold
2305timers_reschedule (EV_P_ ev_tstamp adjust) 2829timers_reschedule (EV_P_ ev_tstamp adjust)
2306{ 2830{
2307 int i; 2831 int i;
2308 2832
2309 for (i = 0; i < timercnt; ++i) 2833 for (i = 0; i < timercnt; ++i)
2346 * doesn't hurt either as we only do this on time-jumps or 2870 * doesn't hurt either as we only do this on time-jumps or
2347 * in the unlikely event of having been preempted here. 2871 * in the unlikely event of having been preempted here.
2348 */ 2872 */
2349 for (i = 4; --i; ) 2873 for (i = 4; --i; )
2350 { 2874 {
2875 ev_tstamp diff;
2351 rtmn_diff = ev_rt_now - mn_now; 2876 rtmn_diff = ev_rt_now - mn_now;
2352 2877
2878 diff = odiff - rtmn_diff;
2879
2353 if (expect_true (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)) 2880 if (expect_true ((diff < 0. ? -diff : diff) < MIN_TIMEJUMP))
2354 return; /* all is well */ 2881 return; /* all is well */
2355 2882
2356 ev_rt_now = ev_time (); 2883 ev_rt_now = ev_time ();
2357 mn_now = get_clock (); 2884 mn_now = get_clock ();
2358 now_floor = mn_now; 2885 now_floor = mn_now;
2448 ev_tstamp prev_mn_now = mn_now; 2975 ev_tstamp prev_mn_now = mn_now;
2449 2976
2450 /* update time to cancel out callback processing overhead */ 2977 /* update time to cancel out callback processing overhead */
2451 time_update (EV_A_ 1e100); 2978 time_update (EV_A_ 1e100);
2452 2979
2980 /* from now on, we want a pipe-wake-up */
2981 pipe_write_wanted = 1;
2982
2983 ECB_MEMORY_FENCE; /* make sure pipe_write_wanted is visible before we check for potential skips */
2984
2453 if (expect_true (!(flags & EVRUN_NOWAIT || idleall || !activecnt))) 2985 if (expect_true (!(flags & EVRUN_NOWAIT || idleall || !activecnt || pipe_write_skipped)))
2454 { 2986 {
2455 waittime = MAX_BLOCKTIME; 2987 waittime = MAX_BLOCKTIME;
2456 2988
2457 if (timercnt) 2989 if (timercnt)
2458 { 2990 {
2459 ev_tstamp to = ANHE_at (timers [HEAP0]) - mn_now + backend_fudge; 2991 ev_tstamp to = ANHE_at (timers [HEAP0]) - mn_now;
2460 if (waittime > to) waittime = to; 2992 if (waittime > to) waittime = to;
2461 } 2993 }
2462 2994
2463#if EV_PERIODIC_ENABLE 2995#if EV_PERIODIC_ENABLE
2464 if (periodiccnt) 2996 if (periodiccnt)
2465 { 2997 {
2466 ev_tstamp to = ANHE_at (periodics [HEAP0]) - ev_rt_now + backend_fudge; 2998 ev_tstamp to = ANHE_at (periodics [HEAP0]) - ev_rt_now;
2467 if (waittime > to) waittime = to; 2999 if (waittime > to) waittime = to;
2468 } 3000 }
2469#endif 3001#endif
2470 3002
2471 /* don't let timeouts decrease the waittime below timeout_blocktime */ 3003 /* don't let timeouts decrease the waittime below timeout_blocktime */
2472 if (expect_false (waittime < timeout_blocktime)) 3004 if (expect_false (waittime < timeout_blocktime))
2473 waittime = timeout_blocktime; 3005 waittime = timeout_blocktime;
3006
3007 /* at this point, we NEED to wait, so we have to ensure */
3008 /* to pass a minimum nonzero value to the backend */
3009 if (expect_false (waittime < backend_mintime))
3010 waittime = backend_mintime;
2474 3011
2475 /* extra check because io_blocktime is commonly 0 */ 3012 /* extra check because io_blocktime is commonly 0 */
2476 if (expect_false (io_blocktime)) 3013 if (expect_false (io_blocktime))
2477 { 3014 {
2478 sleeptime = io_blocktime - (mn_now - prev_mn_now); 3015 sleeptime = io_blocktime - (mn_now - prev_mn_now);
2479 3016
2480 if (sleeptime > waittime - backend_fudge) 3017 if (sleeptime > waittime - backend_mintime)
2481 sleeptime = waittime - backend_fudge; 3018 sleeptime = waittime - backend_mintime;
2482 3019
2483 if (expect_true (sleeptime > 0.)) 3020 if (expect_true (sleeptime > 0.))
2484 { 3021 {
2485 ev_sleep (sleeptime); 3022 ev_sleep (sleeptime);
2486 waittime -= sleeptime; 3023 waittime -= sleeptime;
2493#endif 3030#endif
2494 assert ((loop_done = EVBREAK_RECURSE, 1)); /* assert for side effect */ 3031 assert ((loop_done = EVBREAK_RECURSE, 1)); /* assert for side effect */
2495 backend_poll (EV_A_ waittime); 3032 backend_poll (EV_A_ waittime);
2496 assert ((loop_done = EVBREAK_CANCEL, 1)); /* assert for side effect */ 3033 assert ((loop_done = EVBREAK_CANCEL, 1)); /* assert for side effect */
2497 3034
3035 pipe_write_wanted = 0; /* just an optimisation, no fence needed */
3036
3037 if (pipe_write_skipped)
3038 {
3039 assert (("libev: pipe_w not active, but pipe not written", ev_is_active (&pipe_w)));
3040 ev_feed_event (EV_A_ &pipe_w, EV_CUSTOM);
3041 }
3042
3043
2498 /* update ev_rt_now, do magic */ 3044 /* update ev_rt_now, do magic */
2499 time_update (EV_A_ waittime + sleeptime); 3045 time_update (EV_A_ waittime + sleeptime);
2500 } 3046 }
2501 3047
2502 /* queue pending timers and reschedule them */ 3048 /* queue pending timers and reschedule them */
2752 3298
2753void noinline 3299void noinline
2754ev_timer_again (EV_P_ ev_timer *w) 3300ev_timer_again (EV_P_ ev_timer *w)
2755{ 3301{
2756 EV_FREQUENT_CHECK; 3302 EV_FREQUENT_CHECK;
3303
3304 clear_pending (EV_A_ (W)w);
2757 3305
2758 if (ev_is_active (w)) 3306 if (ev_is_active (w))
2759 { 3307 {
2760 if (w->repeat) 3308 if (w->repeat)
2761 { 3309 {
3078 if (!pend || pend == path) 3626 if (!pend || pend == path)
3079 break; 3627 break;
3080 3628
3081 *pend = 0; 3629 *pend = 0;
3082 w->wd = inotify_add_watch (fs_fd, path, mask); 3630 w->wd = inotify_add_watch (fs_fd, path, mask);
3083 } 3631 }
3084 while (w->wd < 0 && (errno == ENOENT || errno == EACCES)); 3632 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
3085 } 3633 }
3086 } 3634 }
3087 3635
3088 if (w->wd >= 0) 3636 if (w->wd >= 0)
3155 infy_wd (EV_A_ ev->wd, ev->wd, ev); 3703 infy_wd (EV_A_ ev->wd, ev->wd, ev);
3156 ofs += sizeof (struct inotify_event) + ev->len; 3704 ofs += sizeof (struct inotify_event) + ev->len;
3157 } 3705 }
3158} 3706}
3159 3707
3160inline_size void 3708inline_size void ecb_cold
3161ev_check_2625 (EV_P) 3709ev_check_2625 (EV_P)
3162{ 3710{
3163 /* kernels < 2.6.25 are borked 3711 /* kernels < 2.6.25 are borked
3164 * http://www.ussg.indiana.edu/hypermail/linux/kernel/0711.3/1208.html 3712 * http://www.ussg.indiana.edu/hypermail/linux/kernel/0711.3/1208.html
3165 */ 3713 */
3790} 4338}
3791 4339
3792/*****************************************************************************/ 4340/*****************************************************************************/
3793 4341
3794#if EV_WALK_ENABLE 4342#if EV_WALK_ENABLE
3795void 4343void ecb_cold
3796ev_walk (EV_P_ int types, void (*cb)(EV_P_ int type, void *w)) 4344ev_walk (EV_P_ int types, void (*cb)(EV_P_ int type, void *w))
3797{ 4345{
3798 int i, j; 4346 int i, j;
3799 ev_watcher_list *wl, *wn; 4347 ev_watcher_list *wl, *wn;
3800 4348
3844 cb (EV_A_ EV_PERIODIC, ANHE_w (periodics [i])); 4392 cb (EV_A_ EV_PERIODIC, ANHE_w (periodics [i]));
3845#endif 4393#endif
3846 4394
3847#if EV_IDLE_ENABLE 4395#if EV_IDLE_ENABLE
3848 if (types & EV_IDLE) 4396 if (types & EV_IDLE)
3849 for (j = NUMPRI; i--; ) 4397 for (j = NUMPRI; j--; )
3850 for (i = idlecnt [j]; i--; ) 4398 for (i = idlecnt [j]; i--; )
3851 cb (EV_A_ EV_IDLE, idles [j][i]); 4399 cb (EV_A_ EV_IDLE, idles [j][i]);
3852#endif 4400#endif
3853 4401
3854#if EV_FORK_ENABLE 4402#if EV_FORK_ENABLE
3907 4455
3908#if EV_MULTIPLICITY 4456#if EV_MULTIPLICITY
3909 #include "ev_wrap.h" 4457 #include "ev_wrap.h"
3910#endif 4458#endif
3911 4459
3912EV_CPP(})
3913

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