[ViewVC] Diff of: cvs/libev/ev.c

Comparing libev/ev.c (file contents):
Revision 1.376 by root, Sat Jun 4 05:33:29 2011 UTC vs.
Revision 1.409 by root, Sat Feb 4 15:17:34 2012 UTC

 # include EV_H
 #else
 # include "ev.h"
 #endif
-EV_CPP(extern "C" {)
 #ifndef _WIN32
 # include <sys/time.h>
 # include <sys/wait.h>
 # include <unistd.h>
 #else
 #define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
 #define EV_TV_SET(tv,t) do { tv.tv_sec = (long)t; tv.tv_usec = (long)((t - tv.tv_sec) * 1e6); } while (0)
 #define EV_TS_SET(ts,t) do { ts.tv_sec = (long)t; ts.tv_nsec = (long)((t - ts.tv_sec) * 1e9); } while (0)
+/* the following is ecb.h embedded into libev - use update_ev_c to update from an external copy */
+/* ECB.H BEGIN */
+/*
+ * libecb - http://software.schmorp.de/pkg/libecb
+ *
+ * Copyright (©) 2009-2012 Marc Alexander Lehmann <libecb@schmorp.de>
+ * Copyright (©) 2011 Emanuele Giaquinta
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modifica-
+ * tion, are permitted provided that the following conditions are met:
+ *
+ *   1.  Redistributions of source code must retain the above copyright notice,
+ *       this list of conditions and the following disclaimer.
+ *
+ *   2.  Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in the
+ *       documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
+ * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO
+ * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
+ * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
+ * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+#ifndef ECB_H
+#define ECB_H
+#ifdef _WIN32
+  typedef   signed char   int8_t;
+  typedef unsigned char  uint8_t;
+  typedef   signed short  int16_t;
+  typedef unsigned short uint16_t;
+  typedef   signed int    int32_t;
+  typedef unsigned int   uint32_t;
-#if __GNUC__ >= 4
+  #if __GNUC__
-# define expect(expr,value)         __builtin_expect ((expr),(value))
+    typedef   signed long long int64_t;
-# define noinline                   __attribute__ ((noinline))
+    typedef unsigned long long uint64_t;
+  #else /* _MSC_VER || __BORLANDC__ */
+    typedef   signed __int64   int64_t;
+    typedef unsigned __int64   uint64_t;
+  #endif
 #else
-# define expect(expr,value)         (expr)
+  #include <inttypes.h>
-# define noinline
-# if __STDC_VERSION__ < 199901L && __GNUC__ < 2
-#  define inline
-# endif
+#endif
+/* many compilers define _GNUC_ to some versions but then only implement
+ * what their idiot authors think are the "more important" extensions,
+ * causing enormous grief in return for some better fake benchmark numbers.
+ * or so.
+ * we try to detect these and simply assume they are not gcc - if they have
+ * an issue with that they should have done it right in the first place.
+ */
+#ifndef ECB_GCC_VERSION
+  #if !defined(__GNUC_MINOR__) || defined(__INTEL_COMPILER) || defined(__SUNPRO_C) || defined(__SUNPRO_CC) || defined(__llvm__) || defined(__clang__)
+    #define ECB_GCC_VERSION(major,minor) 0
+  #else
+    #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
-#endif
+  #endif
+#endif
+/*****************************************************************************/
+/* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
+/* ECB_NO_SMP     - ecb might be used in multiple threads, but only on a single cpu */
+#if ECB_NO_THREADS || ECB_NO_SMP
+  #define ECB_MEMORY_FENCE do { } while (0)
+#endif
+#ifndef ECB_MEMORY_FENCE
+  #if ECB_GCC_VERSION(2,5) || defined(__INTEL_COMPILER) || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
+    #if __i386 || __i386__
+      #define ECB_MEMORY_FENCE         __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
+      #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE /* non-lock xchg might be enough */
+      #define ECB_MEMORY_FENCE_RELEASE do { } while (0) /* unlikely to change in future cpus */
+    #elif __amd64 || __amd64__ || __x86_64 || __x86_64__
+      #define ECB_MEMORY_FENCE         __asm__ __volatile__ ("mfence" : : : "memory")
+      #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("lfence" : : : "memory")
+      #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("sfence") /* play safe - not needed in any current cpu */
+    #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
+      #define ECB_MEMORY_FENCE         __asm__ __volatile__ ("sync" : : : "memory")
+    #elif defined(__ARM_ARCH_6__ ) || defined(__ARM_ARCH_6J__ ) \
+       || defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6ZK__)
+      #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
+    #elif defined(__ARM_ARCH_7__ ) || defined(__ARM_ARCH_7A__ ) \
+       || defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7R__ )
+      #define ECB_MEMORY_FENCE         __asm__ __volatile__ ("dmb" : : : "memory")
+    #elif __sparc || __sparc__
+      #define ECB_MEMORY_FENCE         __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad | " : : : "memory")
+      #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad"                               : : : "memory")
+      #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore |             #StoreStore")
+    #elif defined(__s390__) || defined(__s390x__)
+      #define ECB_MEMORY_FENCE         __asm__ __volatile__ ("bcr 15,0" : : : "memory")
+    #endif
+  #endif
+#endif
+#ifndef ECB_MEMORY_FENCE
+  #if ECB_GCC_VERSION(4,4) || defined(__INTEL_COMPILER) || defined(__clang__)
+    #define ECB_MEMORY_FENCE         __sync_synchronize ()
+    /*#define ECB_MEMORY_FENCE_ACQUIRE ({ char dummy = 0; __sync_lock_test_and_set (&dummy, 1); }) */
+    /*#define ECB_MEMORY_FENCE_RELEASE ({ char dummy = 1; __sync_lock_release      (&dummy   ); }) */
+  #elif _MSC_VER >= 1400 /* VC++ 2005 */
+    #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
+    #define ECB_MEMORY_FENCE         _ReadWriteBarrier ()
+    #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
+    #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
+  #elif defined(_WIN32)
+    #include <WinNT.h>
+    #define ECB_MEMORY_FENCE         MemoryBarrier () /* actually just xchg on x86... scary */
+  #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
+    #include <mbarrier.h>
+    #define ECB_MEMORY_FENCE         __machine_rw_barrier ()
+    #define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier  ()
+    #define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier  ()
+  #endif
+#endif
+#ifndef ECB_MEMORY_FENCE
+  #if !ECB_AVOID_PTHREADS
+    /*
+     * if you get undefined symbol references to pthread_mutex_lock,
+     * or failure to find pthread.h, then you should implement
+     * the ECB_MEMORY_FENCE operations for your cpu/compiler
+     * OR provide pthread.h and link against the posix thread library
+     * of your system.
+     */
+    #include <pthread.h>
+    #define ECB_NEEDS_PTHREADS 1
+    #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
+    static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
+    #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
+  #endif
+#endif
+#if !defined(ECB_MEMORY_FENCE_ACQUIRE) && defined(ECB_MEMORY_FENCE)
+  #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
+#endif
+#if !defined(ECB_MEMORY_FENCE_RELEASE) && defined(ECB_MEMORY_FENCE)
+  #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
+#endif
+/*****************************************************************************/
+#define ECB_C99 (__STDC_VERSION__ >= 199901L)
+#if __cplusplus
+  #define ecb_inline static inline
+#elif ECB_GCC_VERSION(2,5)
+  #define ecb_inline static __inline__
+#elif ECB_C99
+  #define ecb_inline static inline
+#else
+  #define ecb_inline static
+#endif
+#if ECB_GCC_VERSION(3,3)
+  #define ecb_restrict __restrict__
+#elif ECB_C99
+  #define ecb_restrict restrict
+#else
+  #define ecb_restrict
+#endif
+typedef int ecb_bool;
+#define ECB_CONCAT_(a, b) a ## b
+#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
+#define ECB_STRINGIFY_(a) # a
+#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
+#define ecb_function_ ecb_inline
+#if ECB_GCC_VERSION(3,1)
+  #define ecb_attribute(attrlist)        __attribute__(attrlist)
+  #define ecb_is_constant(expr)          __builtin_constant_p (expr)
+  #define ecb_expect(expr,value)         __builtin_expect ((expr),(value))
+  #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
+#else
+  #define ecb_attribute(attrlist)
+  #define ecb_is_constant(expr)          0
+  #define ecb_expect(expr,value)         (expr)
+  #define ecb_prefetch(addr,rw,locality)
+#endif
+/* no emulation for ecb_decltype */
+#if ECB_GCC_VERSION(4,5)
+  #define ecb_decltype(x) __decltype(x)
+#elif ECB_GCC_VERSION(3,0)
+  #define ecb_decltype(x) __typeof(x)
+#endif
+#define ecb_noinline   ecb_attribute ((__noinline__))
+#define ecb_noreturn   ecb_attribute ((__noreturn__))
+#define ecb_unused     ecb_attribute ((__unused__))
+#define ecb_const      ecb_attribute ((__const__))
+#define ecb_pure       ecb_attribute ((__pure__))
+#if ECB_GCC_VERSION(4,3)
+  #define ecb_artificial ecb_attribute ((__artificial__))
+  #define ecb_hot        ecb_attribute ((__hot__))
+  #define ecb_cold       ecb_attribute ((__cold__))
+#else
+  #define ecb_artificial
+  #define ecb_hot
+  #define ecb_cold
+#endif
+/* put around conditional expressions if you are very sure that the  */
+/* expression is mostly true or mostly false. note that these return */
+/* booleans, not the expression.                                     */
-#define expect_false(expr) expect ((expr) != 0, 0)
+#define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
-#define expect_true(expr)  expect ((expr) != 0, 1)
+#define ecb_expect_true(expr)  ecb_expect (!!(expr), 1)
+/* for compatibility to the rest of the world */
+#define ecb_likely(expr)   ecb_expect_true  (expr)
+#define ecb_unlikely(expr) ecb_expect_false (expr)
+/* count trailing zero bits and count # of one bits */
+#if ECB_GCC_VERSION(3,4)
+  /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
+  #define ecb_ld32(x)      (__builtin_clz      (x) ^ 31)
+  #define ecb_ld64(x)      (__builtin_clzll    (x) ^ 63)
+  #define ecb_ctz32(x)      __builtin_ctz      (x)
+  #define ecb_ctz64(x)      __builtin_ctzll    (x)
+  #define ecb_popcount32(x) __builtin_popcount (x)
+  /* no popcountll */
+#else
+  ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const;
+  ecb_function_ int
+  ecb_ctz32 (uint32_t x)
+  {
+    int r = 0;
+    x &= ~x + 1; /* this isolates the lowest bit */
+#if ECB_branchless_on_i386
+    r += !!(x & 0xaaaaaaaa) << 0;
+    r += !!(x & 0xcccccccc) << 1;
+    r += !!(x & 0xf0f0f0f0) << 2;
+    r += !!(x & 0xff00ff00) << 3;
+    r += !!(x & 0xffff0000) << 4;
+#else
+    if (x & 0xaaaaaaaa) r +=  1;
+    if (x & 0xcccccccc) r +=  2;
+    if (x & 0xf0f0f0f0) r +=  4;
+    if (x & 0xff00ff00) r +=  8;
+    if (x & 0xffff0000) r += 16;
+#endif
+    return r;
+  }
+  ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const;
+  ecb_function_ int
+  ecb_ctz64 (uint64_t x)
+  {
+    int shift = x & 0xffffffffU ? 0 : 32;
+    return ecb_ctz32 (x >> shift) + shift;
+  }
+  ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const;
+  ecb_function_ int
+  ecb_popcount32 (uint32_t x)
+  {
+    x -=  (x >> 1) & 0x55555555;
+    x  = ((x >> 2) & 0x33333333) + (x & 0x33333333);
+    x  = ((x >> 4) + x) & 0x0f0f0f0f;
+    x *= 0x01010101;
+    return x >> 24;
+  }
+  ecb_function_ int ecb_ld32 (uint32_t x) ecb_const;
+  ecb_function_ int ecb_ld32 (uint32_t x)
+  {
+    int r = 0;
+    if (x >> 16) { x >>= 16; r += 16; }
+    if (x >>  8) { x >>=  8; r +=  8; }
+    if (x >>  4) { x >>=  4; r +=  4; }
+    if (x >>  2) { x >>=  2; r +=  2; }
+    if (x >>  1) {           r +=  1; }
+    return r;
+  }
+  ecb_function_ int ecb_ld64 (uint64_t x) ecb_const;
+  ecb_function_ int ecb_ld64 (uint64_t x)
+  {
+    int r = 0;
+    if (x >> 32) { x >>= 32; r += 32; }
+    return r + ecb_ld32 (x);
+  }
+#endif
+ecb_function_ uint8_t  ecb_bitrev8  (uint8_t  x) ecb_const;
+ecb_function_ uint8_t  ecb_bitrev8  (uint8_t  x)
+{
+  return (  (x * 0x0802U & 0x22110U)
+          | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
+}
+ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) ecb_const;
+ecb_function_ uint16_t ecb_bitrev16 (uint16_t x)
+{
+  x = ((x >>  1) &     0x5555) | ((x &     0x5555) <<  1);
+  x = ((x >>  2) &     0x3333) | ((x &     0x3333) <<  2);
+  x = ((x >>  4) &     0x0f0f) | ((x &     0x0f0f) <<  4);
+  x = ( x >>  8              ) | ( x               <<  8);
+  return x;
+}
+ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) ecb_const;
+ecb_function_ uint32_t ecb_bitrev32 (uint32_t x)
+{
+  x = ((x >>  1) & 0x55555555) | ((x & 0x55555555) <<  1);
+  x = ((x >>  2) & 0x33333333) | ((x & 0x33333333) <<  2);
+  x = ((x >>  4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) <<  4);
+  x = ((x >>  8) & 0x00ff00ff) | ((x & 0x00ff00ff) <<  8);
+  x = ( x >> 16              ) | ( x               << 16);
+  return x;
+}
+/* popcount64 is only available on 64 bit cpus as gcc builtin */
+/* so for this version we are lazy */
+ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;
+ecb_function_ int
+ecb_popcount64 (uint64_t x)
+{
+  return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
+}
+ecb_inline uint8_t  ecb_rotl8  (uint8_t  x, unsigned int count) ecb_const;
+ecb_inline uint8_t  ecb_rotr8  (uint8_t  x, unsigned int count) ecb_const;
+ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const;
+ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const;
+ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
+ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
+ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const;
+ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const;
+ecb_inline uint8_t  ecb_rotl8  (uint8_t  x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }
+ecb_inline uint8_t  ecb_rotr8  (uint8_t  x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }
+ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }
+ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }
+ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
+ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
+ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
+ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }
+#if ECB_GCC_VERSION(4,3)
+  #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
+  #define ecb_bswap32(x)  __builtin_bswap32 (x)
+  #define ecb_bswap64(x)  __builtin_bswap64 (x)
+#else
+  ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const;
+  ecb_function_ uint16_t
+  ecb_bswap16 (uint16_t x)
+  {
+    return ecb_rotl16 (x, 8);
+  }
+  ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const;
+  ecb_function_ uint32_t
+  ecb_bswap32 (uint32_t x)
+  {
+    return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
+  }
+  ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const;
+  ecb_function_ uint64_t
+  ecb_bswap64 (uint64_t x)
+  {
+    return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
+  }
+#endif
+#if ECB_GCC_VERSION(4,5)
+  #define ecb_unreachable() __builtin_unreachable ()
+#else
+  /* this seems to work fine, but gcc always emits a warning for it :/ */
+  ecb_inline void ecb_unreachable (void) ecb_noreturn;
+  ecb_inline void ecb_unreachable (void) { }
+#endif
+/* try to tell the compiler that some condition is definitely true */
+#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
+ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const;
+ecb_inline unsigned char
+ecb_byteorder_helper (void)
+{
+  const uint32_t u = 0x11223344;
+  return *(unsigned char *)&u;
+}
+ecb_inline ecb_bool ecb_big_endian    (void) ecb_const;
+ecb_inline ecb_bool ecb_big_endian    (void) { return ecb_byteorder_helper () == 0x11; }
+ecb_inline ecb_bool ecb_little_endian (void) ecb_const;
+ecb_inline ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
+#if ECB_GCC_VERSION(3,0) || ECB_C99
+  #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
+#else
+  #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
+#endif
+#if __cplusplus
+  template<typename T>
+  static inline T ecb_div_rd (T val, T div)
+  {
+    return val < 0 ? - ((-val + div - 1) / div) : (val          ) / div;
+  }
+  template<typename T>
+  static inline T ecb_div_ru (T val, T div)
+  {
+    return val < 0 ? - ((-val          ) / div) : (val + div - 1) / div;
+  }
+#else
+  #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val)            ) / (div))
+  #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val)            ) / (div)) : ((val) + (div) - 1) / (div))
+#endif
+#if ecb_cplusplus_does_not_suck
+  /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
+  template<typename T, int N>
+  static inline int ecb_array_length (const T (&arr)[N])
+  {
+    return N;
+  }
+#else
+  #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
+#endif
+#endif
+/* ECB.H END */
+#if ECB_MEMORY_FENCE_NEEDS_PTHREADS
+/* if your architecture doesn't need memory fences, e.g. because it is
+ * single-cpu/core, or if you use libev in a project that doesn't use libev
+ * from multiple threads, then you can define ECB_AVOID_PTHREADS when compiling
+ * libev, in which cases the memory fences become nops.
+ * alternatively, you can remove this #error and link against libpthread,
+ * which will then provide the memory fences.
+ */
+# error "memory fences not defined for your architecture, please report"
+#endif
+#ifndef ECB_MEMORY_FENCE
+# define ECB_MEMORY_FENCE do { } while (0)
+# define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
+# define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
+#endif
+#define expect_false(cond) ecb_expect_false (cond)
+#define expect_true(cond)  ecb_expect_true  (cond)
+#define noinline           ecb_noinline
-#define inline_size        static inline
+#define inline_size        ecb_inline
 #if EV_FEATURE_CODE
-# define inline_speed      static inline
+# define inline_speed      ecb_inline
 #else
 # define inline_speed      static noinline
 #endif
 #define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
 #ifdef __linux
 # include <sys/utsname.h>
 #endif
-static unsigned int noinline
+static unsigned int noinline ecb_cold
 ev_linux_version (void)
 {
 #ifdef __linux
   unsigned int v = 0;
   struct utsname buf;
 }
 /*****************************************************************************/
 #if EV_AVOID_STDIO
-static void noinline
+static void noinline ecb_cold
 ev_printerr (const char *msg)
 {
   write (STDERR_FILENO, msg, strlen (msg));
 }
 #endif
 static void (*syserr_cb)(const char *msg);
-void
+void ecb_cold
 ev_set_syserr_cb (void (*cb)(const char *msg))
 {
   syserr_cb = cb;
 }
-static void noinline
+static void noinline ecb_cold
 ev_syserr (const char *msg)
 {
   if (!msg)
     msg = "(libev) system error";
 #endif
 }
 static void *(*alloc)(void *ptr, long size) = ev_realloc_emul;
-void
+void ecb_cold
 ev_set_allocator (void *(*cb)(void *ptr, long size))
 {
   alloc = cb;
 }
     #undef VAR
   };
   #include "ev_wrap.h"
   static struct ev_loop default_loop_struct;
-  struct ev_loop *ev_default_loop_ptr;
+  EV_API_DECL struct ev_loop *ev_default_loop_ptr = 0; /* needs to be initialised to make it a definition despite extern */
 #else
-  ev_tstamp ev_rt_now;
+  EV_API_DECL ev_tstamp ev_rt_now = 0; /* needs to be initialised to make it a definition despite extern */
   #define VAR(name,decl) static decl;
     #include "ev_vars.h"
   #undef VAR
   static int ev_default_loop_ptr;
   do
     ncur <<= 1;
   while (cnt > ncur);
-  /* if size is large, round to MALLOC_ROUND - 4 * longs to accomodate malloc overhead */
+  /* if size is large, round to MALLOC_ROUND - 4 * longs to accommodate malloc overhead */
   if (elem * ncur > MALLOC_ROUND - sizeof (void *) * 4)
     {
       ncur *= elem;
       ncur = (ncur + elem + (MALLOC_ROUND - 1) + sizeof (void *) * 4) & ~(MALLOC_ROUND - 1);
       ncur = ncur - sizeof (void *) * 4;
     }
   return ncur;
 }
-static noinline void *
+static void * noinline ecb_cold
 array_realloc (int elem, void *base, int *cur, int cnt)
 {
   *cur = array_nextsize (elem, *cur, cnt);
   return ev_realloc (base, elem * *cur);
 }
   memset ((void *)(base), 0, sizeof (*(base)) * (count))
 #define array_needsize(type,base,cur,cnt,init)			\
   if (expect_false ((cnt) > (cur)))				\
     {								\
-      int ocur_ = (cur);					\
+      int ecb_unused ocur_ = (cur);					\
       (base) = (type *)array_realloc				\
          (sizeof (type), (base), &(cur), (cnt));		\
       init ((base) + (ocur_), (cur) - ocur_);			\
     }
       fdchanges [fdchangecnt - 1] = fd;
     }
 }
 /* the given fd is invalid/unusable, so make sure it doesn't hurt us anymore */
-inline_speed void
+inline_speed void ecb_cold
 fd_kill (EV_P_ int fd)
 {
   ev_io *w;
   while ((w = (ev_io *)anfds [fd].head))
       ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
     }
 }
 /* check whether the given fd is actually valid, for error recovery */
-inline_size int
+inline_size int ecb_cold
 fd_valid (int fd)
 {
 #ifdef _WIN32
   return EV_FD_TO_WIN32_HANDLE (fd) != -1;
 #else
   return fcntl (fd, F_GETFD) != -1;
 #endif
 }
 /* called on EBADF to verify fds */
-static void noinline
+static void noinline ecb_cold
 fd_ebadf (EV_P)
 {
   int fd;
   for (fd = 0; fd < anfdmax; ++fd)
       if (!fd_valid (fd) && errno == EBADF)
         fd_kill (EV_A_ fd);
 }
 /* called on ENOMEM in select/poll to kill some fds and retry */
-static void noinline
+static void noinline ecb_cold
 fd_enomem (EV_P)
 {
   int fd;
   for (fd = anfdmax; fd--; )
 /*****************************************************************************/
 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
-static void noinline
+static void noinline ecb_cold
 evpipe_init (EV_P)
 {
   if (!ev_is_active (&pipe_w))
     {
 # if EV_USE_EVENTFD
       ev_io_start (EV_A_ &pipe_w);
       ev_unref (EV_A); /* watcher should not keep loop alive */
     }
 }
-inline_size void
+inline_speed void
 evpipe_write (EV_P_ EV_ATOMIC_T *flag)
 {
-  if (!*flag)
+  if (expect_true (*flag))
+    return;
+  *flag = 1;
+  ECB_MEMORY_FENCE_RELEASE; /* make sure flag is visible before the wakeup */
+  pipe_write_skipped = 1;
+  ECB_MEMORY_FENCE; /* make sure pipe_write_skipped is visible before we check pipe_write_wanted */
+  if (pipe_write_wanted)
     {
+      int old_errno;
+      pipe_write_skipped = 0; /* just an optimisation, no fence needed */
-      int old_errno = errno; /* save errno because write might clobber it */
+      old_errno = errno; /* save errno because write will clobber it */
-      char dummy;
-      *flag = 1;
 #if EV_USE_EVENTFD
       if (evfd >= 0)
         {
           uint64_t counter = 1;
           write (evfd, &counter, sizeof (uint64_t));
         }
       else
 #endif
+        {
-        /* win32 people keep sending patches that change this write() to send() */
+          /* win32 people keep sending patches that change this write() to send() */
-        /* and then run away. but send() is wrong, it wants a socket handle on win32 */
+          /* and then run away. but send() is wrong, it wants a socket handle on win32 */
-        /* so when you think this write should be a send instead, please find out */
+          /* so when you think this write should be a send instead, please find out */
-        /* where your send() is from - it's definitely not the microsoft send, and */
+          /* where your send() is from - it's definitely not the microsoft send, and */
-        /* tell me. thank you. */
+          /* tell me. thank you. */
-        write (evpipe [1], &dummy, 1);
+          write (evpipe [1], &(evpipe [1]), 1);
+        }
       errno = old_errno;
     }
 }
 static void
 pipecb (EV_P_ ev_io *iow, int revents)
 {
   int i;
+  if (revents & EV_READ)
+    {
 #if EV_USE_EVENTFD
-  if (evfd >= 0)
+      if (evfd >= 0)
-    {
+        {
-      uint64_t counter;
+          uint64_t counter;
-      read (evfd, &counter, sizeof (uint64_t));
+          read (evfd, &counter, sizeof (uint64_t));
-    }
+        }
-  else
+      else
 #endif
-    {
+        {
-      char dummy;
+          char dummy;
-      /* see discussion in evpipe_write when you think this read should be recv in win32 */
+          /* see discussion in evpipe_write when you think this read should be recv in win32 */
-      read (evpipe [0], &dummy, 1);
+          read (evpipe [0], &dummy, 1);
+        }
     }
+  pipe_write_skipped = 0;
 #if EV_SIGNAL_ENABLE
   if (sig_pending)
     {
       sig_pending = 0;
   EV_P = signals [signum - 1].loop;
   if (!EV_A)
     return;
 #endif
+  if (!ev_active (&pipe_w))
+    return;
   signals [signum - 1].pending = 1;
   evpipe_write (EV_A_ &sig_pending);
 }
 #endif
 #if EV_USE_SELECT
 # include "ev_select.c"
 #endif
-int
+int ecb_cold
 ev_version_major (void)
 {
   return EV_VERSION_MAJOR;
 }
-int
+int ecb_cold
 ev_version_minor (void)
 {
   return EV_VERSION_MINOR;
 }
 /* return true if we are running with elevated privileges and should ignore env variables */
-int inline_size
+int inline_size ecb_cold
 enable_secure (void)
 {
 #ifdef _WIN32
   return 0;
 #else
   return getuid () != geteuid ()
       || getgid () != getegid ();
 #endif
 }
-unsigned int
+unsigned int ecb_cold
 ev_supported_backends (void)
 {
   unsigned int flags = 0;
   if (EV_USE_PORT  ) flags |= EVBACKEND_PORT;
   if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
   return flags;
 }
-unsigned int
+unsigned int ecb_cold
 ev_recommended_backends (void)
 {
   unsigned int flags = ev_supported_backends ();
 #ifndef __NetBSD__
 #endif
   return flags;
 }
-unsigned int
+unsigned int ecb_cold
 ev_embeddable_backends (void)
 {
   int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
   /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
 ev_userdata (EV_P)
 {
   return userdata;
 }
+void
-void ev_set_invoke_pending_cb (EV_P_ void (*invoke_pending_cb)(EV_P))
+ev_set_invoke_pending_cb (EV_P_ void (*invoke_pending_cb)(EV_P))
 {
   invoke_cb = invoke_pending_cb;
 }
+void
-void ev_set_loop_release_cb (EV_P_ void (*release)(EV_P), void (*acquire)(EV_P))
+ev_set_loop_release_cb (EV_P_ void (*release)(EV_P), void (*acquire)(EV_P))
 {
   release_cb = release;
   acquire_cb = acquire;
 }
 #endif
 /* initialise a loop structure, must be zero-initialised */
-static void noinline
+static void noinline ecb_cold
 loop_init (EV_P_ unsigned int flags)
 {
   if (!backend)
     {
       origflags = flags;
       if (!(flags & EVFLAG_NOENV)
           && !enable_secure ()
           && getenv ("LIBEV_FLAGS"))
         flags = atoi (getenv ("LIBEV_FLAGS"));
-      ev_rt_now         = ev_time ();
+      ev_rt_now          = ev_time ();
-      mn_now            = get_clock ();
+      mn_now             = get_clock ();
-      now_floor         = mn_now;
+      now_floor          = mn_now;
-      rtmn_diff         = ev_rt_now - mn_now;
+      rtmn_diff          = ev_rt_now - mn_now;
 #if EV_FEATURE_API
-      invoke_cb         = ev_invoke_pending;
+      invoke_cb          = ev_invoke_pending;
 #endif
-      io_blocktime      = 0.;
+      io_blocktime       = 0.;
-      timeout_blocktime = 0.;
+      timeout_blocktime  = 0.;
-      backend           = 0;
+      backend            = 0;
-      backend_fd        = -1;
+      backend_fd         = -1;
-      sig_pending       = 0;
+      sig_pending        = 0;
 #if EV_ASYNC_ENABLE
-      async_pending     = 0;
+      async_pending      = 0;
 #endif
+      pipe_write_skipped = 0;
+      pipe_write_wanted  = 0;
 #if EV_USE_INOTIFY
-      fs_fd             = flags & EVFLAG_NOINOTIFY ? -1 : -2;
+      fs_fd              = flags & EVFLAG_NOINOTIFY ? -1 : -2;
 #endif
 #if EV_USE_SIGNALFD
-      sigfd             = flags & EVFLAG_SIGNALFD  ? -2 : -1;
+      sigfd              = flags & EVFLAG_SIGNALFD  ? -2 : -1;
 #endif
       if (!(flags & EVBACKEND_MASK))
         flags |= ev_recommended_backends ();
 #endif
     }
 }
 /* free up a loop structure */
-void
+void ecb_cold
 ev_loop_destroy (EV_P)
 {
   int i;
 #if EV_MULTIPLICITY
   infy_fork (EV_A);
 #endif
   if (ev_is_active (&pipe_w))
     {
-      /* this "locks" the handlers against writing to the pipe */
+      /* pipe_write_wanted must be false now, so modifying fd vars should be safe */
-      /* while we modify the fd vars */
-      sig_pending   = 1;
-#if EV_ASYNC_ENABLE
-      async_pending = 1;
-#endif
       ev_ref (EV_A);
       ev_io_stop (EV_A_ &pipe_w);
 #if EV_USE_EVENTFD
   postfork = 0;
 }
 #if EV_MULTIPLICITY
-struct ev_loop *
+struct ev_loop * ecb_cold
 ev_loop_new (unsigned int flags)
 {
   EV_P = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
   memset (EV_A, 0, sizeof (struct ev_loop));
 }
 #endif /* multiplicity */
 #if EV_VERIFY
-static void noinline
+static void noinline ecb_cold
 verify_watcher (EV_P_ W w)
 {
   assert (("libev: watcher has invalid priority", ABSPRI (w) >= 0 && ABSPRI (w) < NUMPRI));
   if (w->pending)
     assert (("libev: pending watcher not on pending queue", pendings [ABSPRI (w)][w->pending - 1].w == w));
 }
-static void noinline
+static void noinline ecb_cold
 verify_heap (EV_P_ ANHE *heap, int N)
 {
   int i;
   for (i = HEAP0; i < N + HEAP0; ++i)
       verify_watcher (EV_A_ (W)ANHE_w (heap [i]));
     }
 }
-static void noinline
+static void noinline ecb_cold
 array_verify (EV_P_ W *ws, int cnt)
 {
   while (cnt--)
     {
       assert (("libev: active index mismatch", ev_active (ws [cnt]) == cnt + 1));
     }
 }
 #endif
 #if EV_FEATURE_API
-void
+void ecb_cold
 ev_verify (EV_P)
 {
 #if EV_VERIFY
   int i;
   WL w;
 #endif
 }
 #endif
 #if EV_MULTIPLICITY
-struct ev_loop *
+struct ev_loop * ecb_cold
 #else
 int
 #endif
 ev_default_loop (unsigned int flags)
 {
     }
 }
 /* simply recalculate all periodics */
 /* TODO: maybe ensure that at least one event happens when jumping forward? */
-static void noinline
+static void noinline ecb_cold
 periodics_reschedule (EV_P)
 {
   int i;
   /* adjust periodics after time jump */
   reheap (periodics, periodiccnt);
 }
 #endif
 /* adjust all timers by a given offset */
-static void noinline
+static void noinline ecb_cold
 timers_reschedule (EV_P_ ev_tstamp adjust)
 {
   int i;
   for (i = 0; i < timercnt; ++i)
         ev_tstamp prev_mn_now = mn_now;
         /* update time to cancel out callback processing overhead */
         time_update (EV_A_ 1e100);
+        /* from now on, we want a pipe-wake-up */
+        pipe_write_wanted = 1;
+        ECB_MEMORY_FENCE; /* make sure pipe_write_wanted is visible before we check for potential skips */
-        if (expect_true (!(flags & EVRUN_NOWAIT || idleall || !activecnt)))
+        if (expect_true (!(flags & EVRUN_NOWAIT || idleall || !activecnt || pipe_write_skipped)))
           {
             waittime = MAX_BLOCKTIME;
             if (timercnt)
               {
-                ev_tstamp to = ANHE_at (timers [HEAP0]) - mn_now + backend_mintime;
+                ev_tstamp to = ANHE_at (timers [HEAP0]) - mn_now;
                 if (waittime > to) waittime = to;
               }
 #if EV_PERIODIC_ENABLE
             if (periodiccnt)
               {
-                ev_tstamp to = ANHE_at (periodics [HEAP0]) - ev_rt_now + backend_mintime;
+                ev_tstamp to = ANHE_at (periodics [HEAP0]) - ev_rt_now;
                 if (waittime > to) waittime = to;
               }
 #endif
             /* don't let timeouts decrease the waittime below timeout_blocktime */
             if (expect_false (waittime < timeout_blocktime))
               waittime = timeout_blocktime;
+            /* at this point, we NEED to wait, so we have to ensure */
+            /* to pass a minimum nonzero value to the backend */
+            if (expect_false (waittime < backend_mintime))
+              waittime = backend_mintime;
             /* extra check because io_blocktime is commonly 0 */
             if (expect_false (io_blocktime))
               {
                 sleeptime = io_blocktime - (mn_now - prev_mn_now);
 #endif
         assert ((loop_done = EVBREAK_RECURSE, 1)); /* assert for side effect */
         backend_poll (EV_A_ waittime);
         assert ((loop_done = EVBREAK_CANCEL, 1)); /* assert for side effect */
+        pipe_write_wanted = 0; /* just an optimisation, no fence needed */
+        if (pipe_write_skipped)
+          {
+            assert (("libev: pipe_w not active, but pipe not written", ev_is_active (&pipe_w)));
+            ev_feed_event (EV_A_ &pipe_w, EV_CUSTOM);
+          }
         /* update ev_rt_now, do magic */
         time_update (EV_A_ waittime + sleeptime);
       }
       /* queue pending timers and reschedule them */
 void noinline
 ev_timer_again (EV_P_ ev_timer *w)
 {
   EV_FREQUENT_CHECK;
+  clear_pending (EV_A_ (W)w);
   if (ev_is_active (w))
     {
       if (w->repeat)
         {
       infy_wd (EV_A_ ev->wd, ev->wd, ev);
       ofs += sizeof (struct inotify_event) + ev->len;
     }
 }
-inline_size void
+inline_size void ecb_cold
 ev_check_2625 (EV_P)
 {
   /* kernels < 2.6.25 are borked
    * http://www.ussg.indiana.edu/hypermail/linux/kernel/0711.3/1208.html
    */
 }
 /*****************************************************************************/
 #if EV_WALK_ENABLE
-void
+void ecb_cold
 ev_walk (EV_P_ int types, void (*cb)(EV_P_ int type, void *w))
 {
   int i, j;
   ev_watcher_list *wl, *wn;
       cb (EV_A_ EV_PERIODIC, ANHE_w (periodics [i]));
 #endif
 #if EV_IDLE_ENABLE
   if (types & EV_IDLE)
-    for (j = NUMPRI; i--; )
+    for (j = NUMPRI; j--; )
       for (i = idlecnt [j]; i--; )
         cb (EV_A_ EV_IDLE, idles [j][i]);
 #endif
 #if EV_FORK_ENABLE
 #if EV_MULTIPLICITY
   #include "ev_wrap.h"
 #endif
-EV_CPP(})

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Comparing libev/ev.c (file contents): Revision 1.376 by root, Sat Jun 4 05:33:29 2011 UTC vs. Revision 1.409 by root, Sat Feb 4 15:17:34 2012 UTC

Diff Legend

Comparing libev/ev.c (file contents):
Revision 1.376 by root, Sat Jun 4 05:33:29 2011 UTC vs.
Revision 1.409 by root, Sat Feb 4 15:17:34 2012 UTC