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Comparing libev/ev.c (file contents):
Revision 1.431 by root, Wed May 9 16:51:33 2012 UTC vs.
Revision 1.438 by root, Tue May 29 21:03:44 2012 UTC

504 */ 504 */
505 505
506#ifndef ECB_H 506#ifndef ECB_H
507#define ECB_H 507#define ECB_H
508 508
509/* 16 bits major, 16 bits minor */
510#define ECB_VERSION 0x00010001
511
509#ifdef _WIN32 512#ifdef _WIN32
510 typedef signed char int8_t; 513 typedef signed char int8_t;
511 typedef unsigned char uint8_t; 514 typedef unsigned char uint8_t;
512 typedef signed short int16_t; 515 typedef signed short int16_t;
513 typedef unsigned short uint16_t; 516 typedef unsigned short uint16_t;
518 typedef unsigned long long uint64_t; 521 typedef unsigned long long uint64_t;
519 #else /* _MSC_VER || __BORLANDC__ */ 522 #else /* _MSC_VER || __BORLANDC__ */
520 typedef signed __int64 int64_t; 523 typedef signed __int64 int64_t;
521 typedef unsigned __int64 uint64_t; 524 typedef unsigned __int64 uint64_t;
522 #endif 525 #endif
526 #ifdef _WIN64
527 #define ECB_PTRSIZE 8
528 typedef uint64_t uintptr_t;
529 typedef int64_t intptr_t;
530 #else
531 #define ECB_PTRSIZE 4
532 typedef uint32_t uintptr_t;
533 typedef int32_t intptr_t;
534 #endif
535 typedef intptr_t ptrdiff_t;
523#else 536#else
524 #include <inttypes.h> 537 #include <inttypes.h>
538 #if UINTMAX_MAX > 0xffffffffU
539 #define ECB_PTRSIZE 8
540 #else
541 #define ECB_PTRSIZE 4
542 #endif
525#endif 543#endif
526 544
527/* many compilers define _GNUC_ to some versions but then only implement 545/* many compilers define _GNUC_ to some versions but then only implement
528 * what their idiot authors think are the "more important" extensions, 546 * what their idiot authors think are the "more important" extensions,
529 * causing enormous grief in return for some better fake benchmark numbers. 547 * causing enormous grief in return for some better fake benchmark numbers.
537 #else 555 #else
538 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor))) 556 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
539 #endif 557 #endif
540#endif 558#endif
541 559
560#define ECB_C (__STDC__+0) /* this assumes that __STDC__ is either empty or a number */
561#define ECB_C99 (__STDC_VERSION__ >= 199901L)
562#define ECB_C11 (__STDC_VERSION__ >= 201112L)
563#define ECB_CPP (__cplusplus+0)
564#define ECB_CPP98 (__cplusplus >= 199711L)
565#define ECB_CPP11 (__cplusplus >= 201103L)
566
542/*****************************************************************************/ 567/*****************************************************************************/
543 568
544/* ECB_NO_THREADS - ecb is not used by multiple threads, ever */ 569/* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
545/* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */ 570/* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
546 571
547#if ECB_NO_THREADS 572#if ECB_NO_THREADS
548# define ECB_NO_SMP 1 573# define ECB_NO_SMP 1
549#endif 574#endif
550 575
551#if ECB_NO_THREADS || ECB_NO_SMP 576#if ECB_NO_SMP
552 #define ECB_MEMORY_FENCE do { } while (0) 577 #define ECB_MEMORY_FENCE do { } while (0)
553#endif 578#endif
554 579
555#ifndef ECB_MEMORY_FENCE 580#ifndef ECB_MEMORY_FENCE
556 #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110 581 #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
557 #if __i386 || __i386__ 582 #if __i386 || __i386__
558 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory") 583 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
559 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE /* non-lock xchg might be enough */ 584 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
560 #define ECB_MEMORY_FENCE_RELEASE do { } while (0) /* unlikely to change in future cpus */ 585 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
561 #elif __amd64 || __amd64__ || __x86_64 || __x86_64__ 586 #elif __amd64 || __amd64__ || __x86_64 || __x86_64__
562 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory") 587 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
563 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("lfence" : : : "memory") 588 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
564 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("sfence") /* play safe - not needed in any current cpu */ 589 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
565 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ 590 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
566 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory") 591 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
567 #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \ 592 #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \
568 || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__ 593 || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__
569 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory") 594 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
570 #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \ 595 #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \
571 || defined __ARM_ARCH_7M__ || defined __ARM_ARCH_7R__ 596 || defined __ARM_ARCH_7M__ || defined __ARM_ARCH_7R__
572 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory") 597 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
573 #elif __sparc || __sparc__ 598 #elif __sparc || __sparc__
574 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad | " : : : "memory") 599 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory")
575 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory") 600 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
576 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore") 601 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
577 #elif defined __s390__ || defined __s390x__ 602 #elif defined __s390__ || defined __s390x__
578 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory") 603 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
579 #elif defined __mips__ 604 #elif defined __mips__
580 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory") 605 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
581 #elif defined __alpha__ 606 #elif defined __alpha__
582 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory") 607 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
608 #elif defined __hppa__
609 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
610 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
611 #elif defined __ia64__
612 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory")
583 #endif 613 #endif
584 #endif 614 #endif
585#endif 615#endif
586 616
587#ifndef ECB_MEMORY_FENCE 617#ifndef ECB_MEMORY_FENCE
618 #if ECB_GCC_VERSION(4,7)
619 /* see comment below about the C11 memory model. in short - avoid */
620 #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
621 #elif defined __clang && __has_feature (cxx_atomic)
622 /* see above */
623 #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
588 #if ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__ 624 #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
589 #define ECB_MEMORY_FENCE __sync_synchronize () 625 #define ECB_MEMORY_FENCE __sync_synchronize ()
590 /*#define ECB_MEMORY_FENCE_ACQUIRE ({ char dummy = 0; __sync_lock_test_and_set (&dummy, 1); }) */ 626 /*#define ECB_MEMORY_FENCE_ACQUIRE ({ char dummy = 0; __sync_lock_test_and_set (&dummy, 1); }) */
591 /*#define ECB_MEMORY_FENCE_RELEASE ({ char dummy = 1; __sync_lock_release (&dummy ); }) */ 627 /*#define ECB_MEMORY_FENCE_RELEASE ({ char dummy = 1; __sync_lock_release (&dummy ); }) */
592 #elif _MSC_VER >= 1400 /* VC++ 2005 */ 628 #elif _MSC_VER >= 1400 /* VC++ 2005 */
593 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier) 629 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
606 #define ECB_MEMORY_FENCE __sync () 642 #define ECB_MEMORY_FENCE __sync ()
607 #endif 643 #endif
608#endif 644#endif
609 645
610#ifndef ECB_MEMORY_FENCE 646#ifndef ECB_MEMORY_FENCE
647 #if ECB_C11 && !defined __STDC_NO_ATOMICS__
648 /* we assume that these memory fences work on all variables/all memory accesses, */
649 /* not just C11 atomics and atomic accesses */
650 #include <stdatomic.h>
651 /* unfortunately, the C11 memory model seems to be very limited, and unable to express */
652 /* simple barrier semantics. That means we need to take out thor's hammer. */
653 #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)
654 #endif
655 #endif
656#endif
657
658#ifndef ECB_MEMORY_FENCE
611 #if !ECB_AVOID_PTHREADS 659 #if !ECB_AVOID_PTHREADS
612 /* 660 /*
613 * if you get undefined symbol references to pthread_mutex_lock, 661 * if you get undefined symbol references to pthread_mutex_lock,
614 * or failure to find pthread.h, then you should implement 662 * or failure to find pthread.h, then you should implement
615 * the ECB_MEMORY_FENCE operations for your cpu/compiler 663 * the ECB_MEMORY_FENCE operations for your cpu/compiler
633 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE 681 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
634#endif 682#endif
635 683
636/*****************************************************************************/ 684/*****************************************************************************/
637 685
638#define ECB_C99 (__STDC_VERSION__ >= 199901L)
639
640#if __cplusplus 686#if __cplusplus
641 #define ecb_inline static inline 687 #define ecb_inline static inline
642#elif ECB_GCC_VERSION(2,5) 688#elif ECB_GCC_VERSION(2,5)
643 #define ecb_inline static __inline__ 689 #define ecb_inline static __inline__
644#elif ECB_C99 690#elif ECB_C99
682#elif ECB_GCC_VERSION(3,0) 728#elif ECB_GCC_VERSION(3,0)
683 #define ecb_decltype(x) __typeof(x) 729 #define ecb_decltype(x) __typeof(x)
684#endif 730#endif
685 731
686#define ecb_noinline ecb_attribute ((__noinline__)) 732#define ecb_noinline ecb_attribute ((__noinline__))
687#define ecb_noreturn ecb_attribute ((__noreturn__))
688#define ecb_unused ecb_attribute ((__unused__)) 733#define ecb_unused ecb_attribute ((__unused__))
689#define ecb_const ecb_attribute ((__const__)) 734#define ecb_const ecb_attribute ((__const__))
690#define ecb_pure ecb_attribute ((__pure__)) 735#define ecb_pure ecb_attribute ((__pure__))
736
737#if ECB_C11
738 #define ecb_noreturn _Noreturn
739#else
740 #define ecb_noreturn ecb_attribute ((__noreturn__))
741#endif
691 742
692#if ECB_GCC_VERSION(4,3) 743#if ECB_GCC_VERSION(4,3)
693 #define ecb_artificial ecb_attribute ((__artificial__)) 744 #define ecb_artificial ecb_attribute ((__artificial__))
694 #define ecb_hot ecb_attribute ((__hot__)) 745 #define ecb_hot ecb_attribute ((__hot__))
695 #define ecb_cold ecb_attribute ((__cold__)) 746 #define ecb_cold ecb_attribute ((__cold__))
786 837
787 return r + ecb_ld32 (x); 838 return r + ecb_ld32 (x);
788 } 839 }
789#endif 840#endif
790 841
842ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) ecb_const;
843ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); }
844ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) ecb_const;
845ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); }
846
791ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const; 847ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) ecb_const;
792ecb_function_ uint8_t ecb_bitrev8 (uint8_t x) 848ecb_function_ uint8_t ecb_bitrev8 (uint8_t x)
793{ 849{
794 return ( (x * 0x0802U & 0x22110U) 850 return ( (x * 0x0802U & 0x22110U)
795 | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16; 851 | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
1105#endif 1161#endif
1106 1162
1107static void (*syserr_cb)(const char *msg) EV_THROW; 1163static void (*syserr_cb)(const char *msg) EV_THROW;
1108 1164
1109void ecb_cold 1165void ecb_cold
1110ev_set_syserr_cb (void (*cb)(const char *msg)) EV_THROW 1166ev_set_syserr_cb (void (*cb)(const char *msg) EV_THROW) EV_THROW
1111{ 1167{
1112 syserr_cb = cb; 1168 syserr_cb = cb;
1113} 1169}
1114 1170
1115static void noinline ecb_cold 1171static void noinline ecb_cold
1133 abort (); 1189 abort ();
1134 } 1190 }
1135} 1191}
1136 1192
1137static void * 1193static void *
1138ev_realloc_emul (void *ptr, long size) 1194ev_realloc_emul (void *ptr, long size) EV_THROW
1139{ 1195{
1140#if __GLIBC__ 1196#if __GLIBC__
1141 return realloc (ptr, size); 1197 return realloc (ptr, size);
1142#else 1198#else
1143 /* some systems, notably openbsd and darwin, fail to properly 1199 /* some systems, notably openbsd and darwin, fail to properly
1154} 1210}
1155 1211
1156static void *(*alloc)(void *ptr, long size) EV_THROW = ev_realloc_emul; 1212static void *(*alloc)(void *ptr, long size) EV_THROW = ev_realloc_emul;
1157 1213
1158void ecb_cold 1214void ecb_cold
1159ev_set_allocator (void *(*cb)(void *ptr, long size)) EV_THROW 1215ev_set_allocator (void *(*cb)(void *ptr, long size) EV_THROW) EV_THROW
1160{ 1216{
1161 alloc = cb; 1217 alloc = cb;
1162} 1218}
1163 1219
1164inline_speed void * 1220inline_speed void *
1849 1905
1850 if (expect_true (*flag)) 1906 if (expect_true (*flag))
1851 return; 1907 return;
1852 1908
1853 *flag = 1; 1909 *flag = 1;
1854
1855 ECB_MEMORY_FENCE_RELEASE; /* make sure flag is visible before the wakeup */ 1910 ECB_MEMORY_FENCE_RELEASE; /* make sure flag is visible before the wakeup */
1856 1911
1857 pipe_write_skipped = 1; 1912 pipe_write_skipped = 1;
1858 1913
1859 ECB_MEMORY_FENCE; /* make sure pipe_write_skipped is visible before we check pipe_write_wanted */ 1914 ECB_MEMORY_FENCE; /* make sure pipe_write_skipped is visible before we check pipe_write_wanted */
1860 1915
1861 if (pipe_write_wanted) 1916 if (pipe_write_wanted)
1862 { 1917 {
1863 int old_errno; 1918 int old_errno;
1864 1919
1865 pipe_write_skipped = 0; /* just an optimisation, no fence needed */ 1920 pipe_write_skipped = 0;
1921 ECB_MEMORY_FENCE_RELEASE;
1866 1922
1867 old_errno = errno; /* save errno because write will clobber it */ 1923 old_errno = errno; /* save errno because write will clobber it */
1868 1924
1869#if EV_USE_EVENTFD 1925#if EV_USE_EVENTFD
1870 if (evfd >= 0) 1926 if (evfd >= 0)
1910 { 1966 {
1911 char dummy[4]; 1967 char dummy[4];
1912#ifdef _WIN32 1968#ifdef _WIN32
1913 WSABUF buf; 1969 WSABUF buf;
1914 DWORD recvd; 1970 DWORD recvd;
1971 DWORD flags = 0;
1915 buf.buf = dummy; 1972 buf.buf = dummy;
1916 buf.len = sizeof (dummy); 1973 buf.len = sizeof (dummy);
1917 WSARecv (EV_FD_TO_WIN32_HANDLE (evpipe [0]), &buf, 1, &recvd, 0, 0, 0); 1974 WSARecv (EV_FD_TO_WIN32_HANDLE (evpipe [0]), &buf, 1, &recvd, &flags, 0, 0);
1918#else 1975#else
1919 read (evpipe [0], &dummy, sizeof (dummy)); 1976 read (evpipe [0], &dummy, sizeof (dummy));
1920#endif 1977#endif
1921 } 1978 }
1922 } 1979 }
1928#if EV_SIGNAL_ENABLE 1985#if EV_SIGNAL_ENABLE
1929 if (sig_pending) 1986 if (sig_pending)
1930 { 1987 {
1931 sig_pending = 0; 1988 sig_pending = 0;
1932 1989
1933 ECB_MEMORY_FENCE_RELEASE; 1990 ECB_MEMORY_FENCE;
1934 1991
1935 for (i = EV_NSIG - 1; i--; ) 1992 for (i = EV_NSIG - 1; i--; )
1936 if (expect_false (signals [i].pending)) 1993 if (expect_false (signals [i].pending))
1937 ev_feed_signal_event (EV_A_ i + 1); 1994 ev_feed_signal_event (EV_A_ i + 1);
1938 } 1995 }
1941#if EV_ASYNC_ENABLE 1998#if EV_ASYNC_ENABLE
1942 if (async_pending) 1999 if (async_pending)
1943 { 2000 {
1944 async_pending = 0; 2001 async_pending = 0;
1945 2002
1946 ECB_MEMORY_FENCE_RELEASE; 2003 ECB_MEMORY_FENCE;
1947 2004
1948 for (i = asynccnt; i--; ) 2005 for (i = asynccnt; i--; )
1949 if (asyncs [i]->sent) 2006 if (asyncs [i]->sent)
1950 { 2007 {
1951 asyncs [i]->sent = 0; 2008 asyncs [i]->sent = 0;
2009 ECB_MEMORY_FENCE_RELEASE;
1952 ev_feed_event (EV_A_ asyncs [i], EV_ASYNC); 2010 ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
1953 } 2011 }
1954 } 2012 }
1955#endif 2013#endif
1956} 2014}
2001 if (expect_false (signals [signum].loop != EV_A)) 2059 if (expect_false (signals [signum].loop != EV_A))
2002 return; 2060 return;
2003#endif 2061#endif
2004 2062
2005 signals [signum].pending = 0; 2063 signals [signum].pending = 0;
2064 ECB_MEMORY_FENCE_RELEASE;
2006 2065
2007 for (w = signals [signum].head; w; w = w->next) 2066 for (w = signals [signum].head; w; w = w->next)
2008 ev_feed_event (EV_A_ (W)w, EV_SIGNAL); 2067 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
2009} 2068}
2010 2069
2354 EV_INVOKE_PENDING; 2413 EV_INVOKE_PENDING;
2355 } 2414 }
2356#endif 2415#endif
2357 2416
2358#if EV_CHILD_ENABLE 2417#if EV_CHILD_ENABLE
2359 if (ev_is_active (&childev)) 2418 if (ev_is_default_loop (EV_A) && ev_is_active (&childev))
2360 { 2419 {
2361 ev_ref (EV_A); /* child watcher */ 2420 ev_ref (EV_A); /* child watcher */
2362 ev_signal_stop (EV_A_ &childev); 2421 ev_signal_stop (EV_A_ &childev);
2363 } 2422 }
2364#endif 2423#endif
2811{ 2870{
2812 EV_FREQUENT_CHECK; 2871 EV_FREQUENT_CHECK;
2813 2872
2814 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now) 2873 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now)
2815 { 2874 {
2816 int feed_count = 0;
2817
2818 do 2875 do
2819 { 2876 {
2820 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [HEAP0]); 2877 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [HEAP0]);
2821 2878
2822 /*assert (("libev: inactive timer on periodic heap detected", ev_is_active (w)));*/ 2879 /*assert (("libev: inactive timer on periodic heap detected", ev_is_active (w)));*/

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