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

Comparing libev/ev.c (file contents):
Revision 1.355 by root, Fri Oct 22 10:09:12 2010 UTC vs.
Revision 1.447 by root, Tue Jun 19 12:29:43 2012 UTC

 /*
  * libev event processing core, watcher management
  *
- * Copyright (c) 2007,2008,2009,2010 Marc Alexander Lehmann <libev@schmorp.de>
+ * Copyright (c) 2007,2008,2009,2010,2011,2012 Marc Alexander Lehmann <libev@schmorp.de>
  * 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,
 #  include EV_CONFIG_H
 # else
 #  include "config.h"
 # endif
+#if HAVE_FLOOR
+# ifndef EV_USE_FLOOR
+#  define EV_USE_FLOOR 1
+# endif
+#endif
 # if HAVE_CLOCK_SYSCALL
 #  ifndef EV_USE_CLOCK_SYSCALL
 #   define EV_USE_CLOCK_SYSCALL 1
 #   ifndef EV_USE_REALTIME
 #    define EV_USE_REALTIME  0
 #   endif
 #   ifndef EV_USE_MONOTONIC
 #    define EV_USE_MONOTONIC 1
 #   endif
 #  endif
-# elif !defined(EV_USE_CLOCK_SYSCALL)
+# elif !defined EV_USE_CLOCK_SYSCALL
 #  define EV_USE_CLOCK_SYSCALL 0
 # endif
 # if HAVE_CLOCK_GETTIME
 #  ifndef EV_USE_MONOTONIC
 #  define EV_USE_EVENTFD 0
 # endif
 #endif
-#include <math.h>
 #include <stdlib.h>
 #include <string.h>
 #include <fcntl.h>
 #include <stddef.h>
 # include EV_H
 #else
 # include "ev.h"
 #endif
-EV_CPP(extern "C" {)
+#if EV_NO_THREADS
+# undef EV_NO_SMP
+# define EV_NO_SMP 1
+# undef ECB_NO_THREADS
+# define ECB_NO_THREADS 1
+#endif
+#if EV_NO_SMP
+# undef EV_NO_SMP
+# define ECB_NO_SMP 1
+#endif
 #ifndef _WIN32
 # include <sys/time.h>
 # include <sys/wait.h>
 # include <unistd.h>
 #else
 # include <io.h>
 # define WIN32_LEAN_AND_MEAN
+# include <winsock2.h>
 # include <windows.h>
 # ifndef EV_SELECT_IS_WINSOCKET
 #  define EV_SELECT_IS_WINSOCKET 1
 # endif
 # undef EV_AVOID_STDIO
 #define _DARWIN_UNLIMITED_SELECT 1
 /* this block tries to deduce configuration from header-defined symbols and defaults */
 /* try to deduce the maximum number of signals on this platform */
-#if defined (EV_NSIG)
+#if defined EV_NSIG
 /* use what's provided */
-#elif defined (NSIG)
+#elif defined NSIG
 # define EV_NSIG (NSIG)
-#elif defined(_NSIG)
+#elif defined _NSIG
 # define EV_NSIG (_NSIG)
-#elif defined (SIGMAX)
+#elif defined SIGMAX
 # define EV_NSIG (SIGMAX+1)
-#elif defined (SIG_MAX)
+#elif defined SIG_MAX
 # define EV_NSIG (SIG_MAX+1)
-#elif defined (_SIG_MAX)
+#elif defined _SIG_MAX
 # define EV_NSIG (_SIG_MAX+1)
-#elif defined (MAXSIG)
+#elif defined MAXSIG
 # define EV_NSIG (MAXSIG+1)
-#elif defined (MAX_SIG)
+#elif defined MAX_SIG
 # define EV_NSIG (MAX_SIG+1)
-#elif defined (SIGARRAYSIZE)
+#elif defined SIGARRAYSIZE
 # define EV_NSIG (SIGARRAYSIZE) /* Assume ary[SIGARRAYSIZE] */
-#elif defined (_sys_nsig)
+#elif defined _sys_nsig
 # define EV_NSIG (_sys_nsig) /* Solaris 2.5 */
 #else
 # error "unable to find value for NSIG, please report"
 /* to make it compile regardless, just remove the above line, */
 /* but consider reporting it, too! :) */
 # define EV_NSIG 65
 #endif
+#ifndef EV_USE_FLOOR
+# define EV_USE_FLOOR 0
+#endif
 #ifndef EV_USE_CLOCK_SYSCALL
 # if __linux && __GLIBC__ >= 2
 #  define EV_USE_CLOCK_SYSCALL EV_FEATURE_OS
 # else
 #  define EV_USE_CLOCK_SYSCALL 0
 # endif
 #endif
 #ifndef EV_USE_MONOTONIC
-# if defined (_POSIX_MONOTONIC_CLOCK) && _POSIX_MONOTONIC_CLOCK >= 0
+# if defined _POSIX_MONOTONIC_CLOCK && _POSIX_MONOTONIC_CLOCK >= 0
 #  define EV_USE_MONOTONIC EV_FEATURE_OS
 # else
 #  define EV_USE_MONOTONIC 0
 # endif
 #endif
 #endif
 /* on linux, we can use a (slow) syscall to avoid a dependency on pthread, */
 /* which makes programs even slower. might work on other unices, too. */
 #if EV_USE_CLOCK_SYSCALL
-# include <syscall.h>
+# include <sys/syscall.h>
 # ifdef SYS_clock_gettime
 #  define clock_gettime(id, ts) syscall (SYS_clock_gettime, (id), (ts))
 #  undef EV_USE_MONOTONIC
 #  define EV_USE_MONOTONIC 1
 # else
 # undef EV_USE_INOTIFY
 # define EV_USE_INOTIFY 0
 #endif
 #if !EV_USE_NANOSLEEP
-# ifndef _WIN32
+/* hp-ux has it in sys/time.h, which we unconditionally include above */
+# if !defined _WIN32 && !defined __hpux
 #  include <sys/select.h>
 # endif
 #endif
 #if EV_USE_INOTIFY
-# include <sys/utsname.h>
 # include <sys/statfs.h>
 # include <sys/inotify.h>
 /* some very old inotify.h headers don't have IN_DONT_FOLLOW */
 # ifndef IN_DONT_FOLLOW
 #  undef EV_USE_INOTIFY
 #  define EV_USE_INOTIFY 0
 # endif
-#endif
-#if EV_SELECT_IS_WINSOCKET
-# include <winsock.h>
 #endif
 #if EV_USE_EVENTFD
 /* our minimum requirement is glibc 2.7 which has the stub, but not the header */
 # include <stdint.h>
 #else
 # define EV_FREQUENT_CHECK do { } while (0)
 #endif
 /*
- * This is used to avoid floating point rounding problems.
+ * This is used to work around floating point rounding problems.
- * It is added to ev_rt_now when scheduling periodics
- * to ensure progress, time-wise, even when rounding
- * errors are against us.
  * This value is good at least till the year 4000.
- * Better solutions welcome.
  */
-#define TIME_EPSILON  0.0001220703125 /* 1/8192 */
+#define MIN_INTERVAL  0.0001220703125 /* 1/2**13, good till 4000 */
+/*#define MIN_INTERVAL  0.00000095367431640625 /* 1/2**20, good till 2200 */
 #define MIN_TIMEJUMP  1. /* minimum timejump that gets detected (if monotonic clock available) */
 #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
+/* 16 bits major, 16 bits minor */
+#define ECB_VERSION 0x00010001
+#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
+  #ifdef _WIN64
+    #define ECB_PTRSIZE 8
+    typedef uint64_t uintptr_t;
+    typedef  int64_t  intptr_t;
+  #else
+    #define ECB_PTRSIZE 4
+    typedef uint32_t uintptr_t;
+    typedef  int32_t  intptr_t;
+  #endif
+ typedef intptr_t ptrdiff_t;
 #else
-# define expect(expr,value)         (expr)
+  #include <inttypes.h>
-# define noinline
+  #if UINTMAX_MAX > 0xffffffffU
-# if __STDC_VERSION__ < 199901L && __GNUC__ < 2
+    #define ECB_PTRSIZE 8
-#  define inline
+  #else
+    #define ECB_PTRSIZE 4
+  #endif
-# 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
+#define ECB_C     (__STDC__+0) /* this assumes that __STDC__ is either empty or a number */
+#define ECB_C99   (__STDC_VERSION__ >= 199901L)
+#define ECB_C11   (__STDC_VERSION__ >= 201112L)
+#define ECB_CPP   (__cplusplus+0)
+#define ECB_CPP11 (__cplusplus >= 201103L)
+/*****************************************************************************/
+/* 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
+  #define ECB_NO_SMP 1
+#endif
+#if 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 __asm__ __volatile__ (""                        : : : "memory")
+      #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
+    #elif __amd64 || __amd64__ || __x86_64 || __x86_64__
+      #define ECB_MEMORY_FENCE         __asm__ __volatile__ ("mfence"   : : : "memory")
+      #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ (""         : : : "memory")
+      #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
+    #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")
+    #elif defined __mips__
+      #define ECB_MEMORY_FENCE         __asm__ __volatile__ ("sync"     : : : "memory")
+    #elif defined __alpha__
+      #define ECB_MEMORY_FENCE         __asm__ __volatile__ ("mb"       : : : "memory")
+    #elif defined __hppa__
+      #define ECB_MEMORY_FENCE         __asm__ __volatile__ (""         : : : "memory")
+      #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
+    #elif defined __ia64__
+      #define ECB_MEMORY_FENCE         __asm__ __volatile__ ("mf"       : : : "memory")
+    #endif
+  #endif
+#endif
+#ifndef ECB_MEMORY_FENCE
+  #if ECB_GCC_VERSION(4,7)
+    /* see comment below (stdatomic.h) about the C11 memory model. */
+    #define ECB_MEMORY_FENCE         __atomic_thread_fence (__ATOMIC_SEQ_CST)
+  #elif defined __clang && __has_feature (cxx_atomic)
+    /* see comment below (stdatomic.h) about the C11 memory model. */
+    #define ECB_MEMORY_FENCE         __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
+  #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
+    #define ECB_MEMORY_FENCE         __sync_synchronize ()
+  #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  ()
+  #elif __xlC__
+    #define ECB_MEMORY_FENCE         __sync ()
+  #endif
+#endif
+#ifndef ECB_MEMORY_FENCE
+  #if ECB_C11 && !defined __STDC_NO_ATOMICS__
+    /* we assume that these memory fences work on all variables/all memory accesses, */
+    /* not just C11 atomics and atomic accesses */
+    #include <stdatomic.h>
+    /* Unfortunately, neither gcc 4.7 nor clang 3.1 generate any instructions for */
+    /* any fence other than seq_cst, which isn't very efficient for us. */
+    /* Why that is, we don't know - either the C11 memory model is quite useless */
+    /* for most usages, or gcc and clang have a bug */
+    /* I *currently* lean towards the latter, and inefficiently implement */
+    /* all three of ecb's fences as a seq_cst fence */
+    #define ECB_MEMORY_FENCE         atomic_thread_fence (memory_order_seq_cst)
+  #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
+/*****************************************************************************/
+#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_unused     ecb_attribute ((__unused__))
+#define ecb_const      ecb_attribute ((__const__))
+#define ecb_pure       ecb_attribute ((__pure__))
+#if ECB_C11
+  #define ecb_noreturn   _Noreturn
+#else
+  #define ecb_noreturn   ecb_attribute ((__noreturn__))
+#endif
+#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_ ecb_bool ecb_is_pot32 (uint32_t x) ecb_const;
+ecb_function_ ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); }
+ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) ecb_const;
+ecb_function_ ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); }
+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)
 # include "ev_win32.c"
 #endif
 /*****************************************************************************/
+/* define a suitable floor function (only used by periodics atm) */
+#if EV_USE_FLOOR
+# include <math.h>
+# define ev_floor(v) floor (v)
+#else
+#include <float.h>
+/* a floor() replacement function, should be independent of ev_tstamp type */
+static ev_tstamp noinline
+ev_floor (ev_tstamp v)
+{
+  /* the choice of shift factor is not terribly important */
+#if FLT_RADIX != 2 /* assume FLT_RADIX == 10 */
+  const ev_tstamp shift = sizeof (unsigned long) >= 8 ? 10000000000000000000. : 1000000000.;
+#else
+  const ev_tstamp shift = sizeof (unsigned long) >= 8 ? 18446744073709551616. : 4294967296.;
+#endif
+  /* argument too large for an unsigned long? */
+  if (expect_false (v >= shift))
+    {
+      ev_tstamp f;
+      if (v == v - 1.)
+        return v; /* very large number */
+      f = shift * ev_floor (v * (1. / shift));
+      return f + ev_floor (v - f);
+    }
+  /* special treatment for negative args? */
+  if (expect_false (v < 0.))
+    {
+      ev_tstamp f = -ev_floor (-v);
+      return f - (f == v ? 0 : 1);
+    }
+  /* fits into an unsigned long */
+  return (unsigned long)v;
+}
+#endif
+/*****************************************************************************/
+#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;
-  unsigned int v;
   int i;
   char *p = buf.release;
   if (uname (&buf))
     return 0;
 }
 /*****************************************************************************/
 #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);
+static void (*syserr_cb)(const char *msg) EV_THROW;
-void
+void ecb_cold
-ev_set_syserr_cb (void (*cb)(const char *msg))
+ev_set_syserr_cb (void (*cb)(const char *msg) EV_THROW) EV_THROW
 {
   syserr_cb = cb;
 }
-static void noinline
+static void noinline ecb_cold
 ev_syserr (const char *msg)
 {
   if (!msg)
     msg = "(libev) system error";
   if (syserr_cb)
     syserr_cb (msg);
   else
     {
 #if EV_AVOID_STDIO
-      const char *err = strerror (errno);
       ev_printerr (msg);
       ev_printerr (": ");
-      ev_printerr (err);
+      ev_printerr (strerror (errno));
       ev_printerr ("\n");
 #else
       perror (msg);
 #endif
       abort ();
     }
 }
 static void *
-ev_realloc_emul (void *ptr, long size)
+ev_realloc_emul (void *ptr, long size) EV_THROW
 {
-#if __GLIBC__
-  return realloc (ptr, size);
-#else
   /* some systems, notably openbsd and darwin, fail to properly
    * implement realloc (x, 0) (as required by both ansi c-89 and
    * the single unix specification, so work around them here.
+   * recently, also (at least) fedora and debian started breaking it,
+   * despite documenting it otherwise.
    */
   if (size)
     return realloc (ptr, size);
   free (ptr);
   return 0;
-#endif
 }
-static void *(*alloc)(void *ptr, long size) = ev_realloc_emul;
+static void *(*alloc)(void *ptr, long size) EV_THROW = ev_realloc_emul;
-void
+void ecb_cold
-ev_set_allocator (void *(*cb)(void *ptr, long size))
+ev_set_allocator (void *(*cb)(void *ptr, long size) EV_THROW) EV_THROW
 {
   alloc = cb;
 }
 inline_speed void *
   ptr = alloc (ptr, size);
   if (!ptr && size)
     {
 #if EV_AVOID_STDIO
-      ev_printerr ("libev: memory allocation failed, aborting.\n");
+      ev_printerr ("(libev) memory allocation failed, aborting.\n");
 #else
-      fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
+      fprintf (stderr, "(libev) cannot allocate %ld bytes, aborting.", size);
 #endif
       abort ();
     }
   return ptr;
   unsigned char emask;  /* the epoll backend stores the actual kernel mask in here */
   unsigned char unused;
 #if EV_USE_EPOLL
   unsigned int egen;    /* generation counter to counter epoll bugs */
 #endif
-#if EV_SELECT_IS_WINSOCKET
+#if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
   SOCKET handle;
+#endif
+#if EV_USE_IOCP
+  OVERLAPPED or, ow;
 #endif
 } ANFD;
 /* stores the pending event set for a given watcher */
 typedef struct
     #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;
 /*****************************************************************************/
 #ifndef EV_HAVE_EV_TIME
 ev_tstamp
-ev_time (void)
+ev_time (void) EV_THROW
 {
 #if EV_USE_REALTIME
   if (expect_true (have_realtime))
     {
       struct timespec ts;
   return ev_time ();
 }
 #if EV_MULTIPLICITY
 ev_tstamp
-ev_now (EV_P)
+ev_now (EV_P) EV_THROW
 {
   return ev_rt_now;
 }
 #endif
 void
-ev_sleep (ev_tstamp delay)
+ev_sleep (ev_tstamp delay) EV_THROW
 {
   if (delay > 0.)
     {
 #if EV_USE_NANOSLEEP
       struct timespec ts;
       EV_TS_SET (ts, delay);
       nanosleep (&ts, 0);
-#elif defined(_WIN32)
+#elif defined _WIN32
       Sleep ((unsigned long)(delay * 1e3));
 #else
       struct timeval tv;
       /* here we rely on sys/time.h + sys/types.h + unistd.h providing select */
   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_);			\
     }
 pendingcb (EV_P_ ev_prepare *w, int revents)
 {
 }
 void noinline
-ev_feed_event (EV_P_ void *w, int revents)
+ev_feed_event (EV_P_ void *w, int revents) EV_THROW
 {
   W w_ = (W)w;
   int pri = ABSPRI (w_);
   if (expect_false (w_->pending))
       w_->pending = ++pendingcnt [pri];
       array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
       pendings [pri][w_->pending - 1].w      = w_;
       pendings [pri][w_->pending - 1].events = revents;
     }
+  pendingpri = NUMPRI - 1;
 }
 inline_speed void
 feed_reverse (EV_P_ W w)
 {
   if (expect_true (!anfd->reify))
     fd_event_nocheck (EV_A_ fd, revents);
 }
 void
-ev_feed_fd_event (EV_P_ int fd, int revents)
+ev_feed_fd_event (EV_P_ int fd, int revents) EV_THROW
 {
   if (fd >= 0 && fd < anfdmax)
     fd_event_nocheck (EV_A_ fd, revents);
 }
 inline_size void
 fd_reify (EV_P)
 {
   int i;
+#if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
+  for (i = 0; i < fdchangecnt; ++i)
+    {
+      int fd = fdchanges [i];
+      ANFD *anfd = anfds + fd;
+      if (anfd->reify & EV__IOFDSET && anfd->head)
+        {
+          SOCKET handle = EV_FD_TO_WIN32_HANDLE (fd);
+          if (handle != anfd->handle)
+            {
+              unsigned long arg;
+              assert (("libev: only socket fds supported in this configuration", ioctlsocket (handle, FIONREAD, &arg) == 0));
+              /* handle changed, but fd didn't - we need to do it in two steps */
+              backend_modify (EV_A_ fd, anfd->events, 0);
+              anfd->events = 0;
+              anfd->handle = handle;
+            }
+        }
+    }
+#endif
   for (i = 0; i < fdchangecnt; ++i)
     {
       int fd = fdchanges [i];
       ANFD *anfd = anfds + fd;
       ev_io *w;
       unsigned char o_events = anfd->events;
       unsigned char o_reify  = anfd->reify;
       anfd->reify  = 0;
-#if EV_SELECT_IS_WINSOCKET
-      if (o_reify & EV__IOFDSET)
-        {
-          unsigned long arg;
-          anfd->handle = EV_FD_TO_WIN32_HANDLE (fd);
-          assert (("libev: only socket fds supported in this configuration", ioctlsocket (anfd->handle, FIONREAD, &arg) == 0));
-        }
-#endif
       /*if (expect_true (o_reify & EV_ANFD_REIFY)) probably a deoptimisation */
         {
           anfd->events = 0;
           for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
       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)
+  ECB_MEMORY_FENCE; /* push out the write before this function was called, acquire 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;
+      ECB_MEMORY_FENCE_RELEASE;
-      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() */
+        {
-        /* and then run away. but send() is wrong, it wants a socket handle on win32 */
+#ifdef _WIN32
-        /* so when you think this write should be a send instead, please find out */
+          WSABUF buf;
-        /* where your send() is from - it's definitely not the microsoft send, and */
+          DWORD sent;
-        /* tell me. thank you. */
+          buf.buf = &buf;
+          buf.len = 1;
+          WSASend (EV_FD_TO_WIN32_HANDLE (evpipe [1]), &buf, 1, &sent, 0, 0, 0);
+#else
-        write (evpipe [1], &dummy, 1);
+          write (evpipe [1], &(evpipe [1]), 1);
+#endif
+        }
       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[4];
-      /* see discussion in evpipe_write when you think this read should be recv in win32 */
+#ifdef _WIN32
+          WSABUF buf;
+          DWORD recvd;
+          DWORD flags = 0;
+          buf.buf = dummy;
+          buf.len = sizeof (dummy);
+          WSARecv (EV_FD_TO_WIN32_HANDLE (evpipe [0]), &buf, 1, &recvd, &flags, 0, 0);
+#else
-      read (evpipe [0], &dummy, 1);
+          read (evpipe [0], &dummy, sizeof (dummy));
+#endif
+        }
     }
+  pipe_write_skipped = 0;
+  ECB_MEMORY_FENCE; /* push out skipped, acquire flags */
+#if EV_SIGNAL_ENABLE
   if (sig_pending)
     {
       sig_pending = 0;
+      ECB_MEMORY_FENCE;
       for (i = EV_NSIG - 1; i--; )
         if (expect_false (signals [i].pending))
           ev_feed_signal_event (EV_A_ i + 1);
     }
+#endif
 #if EV_ASYNC_ENABLE
   if (async_pending)
     {
       async_pending = 0;
+      ECB_MEMORY_FENCE;
       for (i = asynccnt; i--; )
         if (asyncs [i]->sent)
           {
             asyncs [i]->sent = 0;
+            ECB_MEMORY_FENCE_RELEASE;
             ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
           }
     }
 #endif
 }
 /*****************************************************************************/
+void
+ev_feed_signal (int signum) EV_THROW
+{
+#if EV_MULTIPLICITY
+  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);
+}
 static void
 ev_sighandler (int signum)
 {
-#if EV_MULTIPLICITY
-  EV_P = signals [signum - 1].loop;
-#endif
 #ifdef _WIN32
   signal (signum, ev_sighandler);
 #endif
-  signals [signum - 1].pending = 1;
+  ev_feed_signal (signum);
-  evpipe_write (EV_A_ &sig_pending);
 }
 void noinline
-ev_feed_signal_event (EV_P_ int signum)
+ev_feed_signal_event (EV_P_ int signum) EV_THROW
 {
   WL w;
-  if (expect_false (signum <= 0 || signum > EV_NSIG))
+  if (expect_false (signum <= 0 || signum >= EV_NSIG))
     return;
   --signum;
 #if EV_MULTIPLICITY
   if (expect_false (signals [signum].loop != EV_A))
     return;
 #endif
   signals [signum].pending = 0;
+  ECB_MEMORY_FENCE_RELEASE;
   for (w = signals [signum].head; w; w = w->next)
     ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
 }
 #endif
 /*****************************************************************************/
+#if EV_USE_IOCP
+# include "ev_iocp.c"
+#endif
 #if EV_USE_PORT
 # include "ev_port.c"
 #endif
 #if EV_USE_KQUEUE
 # include "ev_kqueue.c"
 #endif
 #if EV_USE_SELECT
 # include "ev_select.c"
 #endif
-int
+int ecb_cold
-ev_version_major (void)
+ev_version_major (void) EV_THROW
 {
   return EV_VERSION_MAJOR;
 }
-int
+int ecb_cold
-ev_version_minor (void)
+ev_version_minor (void) EV_THROW
 {
   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)
+ev_supported_backends (void) EV_THROW
 {
   unsigned int flags = 0;
   if (EV_USE_PORT  ) flags |= EVBACKEND_PORT;
   if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
   if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
   return flags;
 }
-unsigned int
+unsigned int ecb_cold
-ev_recommended_backends (void)
+ev_recommended_backends (void) EV_THROW
 {
   unsigned int flags = ev_supported_backends ();
 #ifndef __NetBSD__
   /* kqueue is borked on everything but netbsd apparently */
 #endif
   return flags;
 }
-unsigned int
+unsigned int ecb_cold
-ev_embeddable_backends (void)
+ev_embeddable_backends (void) EV_THROW
 {
   int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
   /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
   if (ev_linux_version () < 0x020620) /* disable it on linux < 2.6.32 */
   return flags;
 }
 unsigned int
-ev_backend (EV_P)
+ev_backend (EV_P) EV_THROW
 {
   return backend;
 }
 #if EV_FEATURE_API
 unsigned int
-ev_iteration (EV_P)
+ev_iteration (EV_P) EV_THROW
 {
   return loop_count;
 }
 unsigned int
-ev_depth (EV_P)
+ev_depth (EV_P) EV_THROW
 {
   return loop_depth;
 }
 void
-ev_set_io_collect_interval (EV_P_ ev_tstamp interval)
+ev_set_io_collect_interval (EV_P_ ev_tstamp interval) EV_THROW
 {
   io_blocktime = interval;
 }
 void
-ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval)
+ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval) EV_THROW
 {
   timeout_blocktime = interval;
 }
 void
-ev_set_userdata (EV_P_ void *data)
+ev_set_userdata (EV_P_ void *data) EV_THROW
 {
   userdata = data;
 }
 void *
-ev_userdata (EV_P)
+ev_userdata (EV_P) EV_THROW
 {
   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)) EV_THROW
 {
   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) EV_THROW, void (*acquire)(EV_P) EV_THROW) EV_THROW
 {
   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)
+loop_init (EV_P_ unsigned int flags) EV_THROW
 {
   if (!backend)
     {
+      origflags = flags;
 #if EV_USE_REALTIME
       if (!have_realtime)
         {
           struct timespec ts;
       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 & 0x0000ffffU))
+      if (!(flags & EVBACKEND_MASK))
         flags |= ev_recommended_backends ();
+#if EV_USE_IOCP
+      if (!backend && (flags & EVBACKEND_IOCP  )) backend = iocp_init   (EV_A_ flags);
+#endif
 #if EV_USE_PORT
       if (!backend && (flags & EVBACKEND_PORT  )) backend = port_init   (EV_A_ flags);
 #endif
 #if EV_USE_KQUEUE
       if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
 #endif
     }
 }
 /* free up a loop structure */
-static void noinline
+void ecb_cold
-loop_destroy (EV_P)
+ev_loop_destroy (EV_P)
 {
   int i;
+#if EV_MULTIPLICITY
+  /* mimic free (0) */
+  if (!EV_A)
+    return;
+#endif
+#if EV_CLEANUP_ENABLE
+  /* queue cleanup watchers (and execute them) */
+  if (expect_false (cleanupcnt))
+    {
+      queue_events (EV_A_ (W *)cleanups, cleanupcnt, EV_CLEANUP);
+      EV_INVOKE_PENDING;
+    }
+#endif
+#if EV_CHILD_ENABLE
+  if (ev_is_default_loop (EV_A) && ev_is_active (&childev))
+    {
+      ev_ref (EV_A); /* child watcher */
+      ev_signal_stop (EV_A_ &childev);
+    }
+#endif
   if (ev_is_active (&pipe_w))
     {
       /*ev_ref (EV_A);*/
       /*ev_io_stop (EV_A_ &pipe_w);*/
 #endif
   if (backend_fd >= 0)
     close (backend_fd);
+#if EV_USE_IOCP
+  if (backend == EVBACKEND_IOCP  ) iocp_destroy   (EV_A);
+#endif
 #if EV_USE_PORT
   if (backend == EVBACKEND_PORT  ) port_destroy   (EV_A);
 #endif
 #if EV_USE_KQUEUE
   if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
   array_free (periodic, EMPTY);
 #endif
 #if EV_FORK_ENABLE
   array_free (fork, EMPTY);
 #endif
+#if EV_CLEANUP_ENABLE
+  array_free (cleanup, EMPTY);
+#endif
   array_free (prepare, EMPTY);
   array_free (check, EMPTY);
 #if EV_ASYNC_ENABLE
   array_free (async, EMPTY);
 #endif
   backend = 0;
+#if EV_MULTIPLICITY
+  if (ev_is_default_loop (EV_A))
+#endif
+    ev_default_loop_ptr = 0;
+#if EV_MULTIPLICITY
+  else
+    ev_free (EV_A);
+#endif
 }
 #if EV_USE_INOTIFY
 inline_size void infy_fork (EV_P);
 #endif
   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
           EV_WIN32_CLOSE_FD (evpipe [1]);
         }
 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
       evpipe_init (EV_A);
-      /* now iterate over everything, in case we missed something */
+      /* iterate over everything, in case we missed something before */
-      pipecb (EV_A_ &pipe_w, EV_READ);
+      ev_feed_event (EV_A_ &pipe_w, EV_CUSTOM);
 #endif
     }
   postfork = 0;
 }
 #if EV_MULTIPLICITY
-struct ev_loop *
+struct ev_loop * ecb_cold
-ev_loop_new (unsigned int flags)
+ev_loop_new (unsigned int flags) EV_THROW
 {
   EV_P = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
   memset (EV_A, 0, sizeof (struct ev_loop));
   loop_init (EV_A_ flags);
   if (ev_backend (EV_A))
     return EV_A;
+  ev_free (EV_A);
   return 0;
 }
-void
-ev_loop_destroy (EV_P)
-{
-  loop_destroy (EV_A);
-  ev_free (loop);
-}
-void
-ev_loop_fork (EV_P)
-{
-  postfork = 1; /* must be in line with ev_default_fork */
-}
 #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)
+ev_verify (EV_P) EV_THROW
 {
 #if EV_VERIFY
   int i;
-  WL w;
+  WL w, w2;
   assert (activecnt >= -1);
   assert (fdchangemax >= fdchangecnt);
   for (i = 0; i < fdchangecnt; ++i)
     assert (("libev: negative fd in fdchanges", fdchanges [i] >= 0));
   assert (anfdmax >= 0);
   for (i = 0; i < anfdmax; ++i)
+    {
+      int j = 0;
-    for (w = anfds [i].head; w; w = w->next)
+      for (w = w2 = anfds [i].head; w; w = w->next)
-      {
+        {
-        verify_watcher (EV_A_ (W)w);
+          verify_watcher (EV_A_ (W)w);
+          if (j++ & 1)
+            {
+              assert (("libev: io watcher list contains a loop", w != w2));
+              w2 = w2->next;
+            }
-        assert (("libev: inactive fd watcher on anfd list", ev_active (w) == 1));
+          assert (("libev: inactive fd watcher on anfd list", ev_active (w) == 1));
-        assert (("libev: fd mismatch between watcher and anfd", ((ev_io *)w)->fd == i));
+          assert (("libev: fd mismatch between watcher and anfd", ((ev_io *)w)->fd == i));
-      }
+        }
+    }
   assert (timermax >= timercnt);
   verify_heap (EV_A_ timers, timercnt);
 #if EV_PERIODIC_ENABLE
 #if EV_FORK_ENABLE
   assert (forkmax >= forkcnt);
   array_verify (EV_A_ (W *)forks, forkcnt);
 #endif
+#if EV_CLEANUP_ENABLE
+  assert (cleanupmax >= cleanupcnt);
+  array_verify (EV_A_ (W *)cleanups, cleanupcnt);
+#endif
 #if EV_ASYNC_ENABLE
   assert (asyncmax >= asynccnt);
   array_verify (EV_A_ (W *)asyncs, asynccnt);
 #endif
 #endif
 }
 #endif
 #if EV_MULTIPLICITY
-struct ev_loop *
+struct ev_loop * ecb_cold
-ev_default_loop_init (unsigned int flags)
 #else
 int
+#endif
-ev_default_loop (unsigned int flags)
+ev_default_loop (unsigned int flags) EV_THROW
-#endif
 {
   if (!ev_default_loop_ptr)
     {
 #if EV_MULTIPLICITY
       EV_P = ev_default_loop_ptr = &default_loop_struct;
   return ev_default_loop_ptr;
 }
 void
-ev_default_destroy (void)
+ev_loop_fork (EV_P) EV_THROW
 {
-#if EV_MULTIPLICITY
+  postfork = 1;
-  EV_P = ev_default_loop_ptr;
-#endif
-  ev_default_loop_ptr = 0;
-#if EV_CHILD_ENABLE
-  ev_ref (EV_A); /* child watcher */
-  ev_signal_stop (EV_A_ &childev);
-#endif
-  loop_destroy (EV_A);
-}
-void
-ev_default_fork (void)
-{
-#if EV_MULTIPLICITY
-  EV_P = ev_default_loop_ptr;
-#endif
-  postfork = 1; /* must be in line with ev_loop_fork */
 }
 /*****************************************************************************/
 void
 {
   EV_CB_INVOKE ((W)w, revents);
 }
 unsigned int
-ev_pending_count (EV_P)
+ev_pending_count (EV_P) EV_THROW
 {
   int pri;
   unsigned int count = 0;
   for (pri = NUMPRI; pri--; )
 }
 void noinline
 ev_invoke_pending (EV_P)
 {
-  int pri;
+  pendingpri = NUMPRI;
-  for (pri = NUMPRI; pri--; )
+  while (pendingpri) /* pendingpri possibly gets modified in the inner loop */
+    {
+      --pendingpri;
-    while (pendingcnt [pri])
+      while (pendingcnt [pendingpri])
-      {
+        {
-        ANPENDING *p = pendings [pri] + --pendingcnt [pri];
+          ANPENDING *p = pendings [pendingpri] + --pendingcnt [pendingpri];
-        /*assert (("libev: non-pending watcher on pending list", p->w->pending));*/
-        /* ^ this is no longer true, as pending_w could be here */
-        p->w->pending = 0;
+          p->w->pending = 0;
-        EV_CB_INVOKE (p->w, p->events);
+          EV_CB_INVOKE (p->w, p->events);
-        EV_FREQUENT_CHECK;
+          EV_FREQUENT_CHECK;
-      }
+        }
+    }
 }
 #if EV_IDLE_ENABLE
 /* make idle watchers pending. this handles the "call-idle */
 /* only when higher priorities are idle" logic */
       feed_reverse_done (EV_A_ EV_TIMER);
     }
 }
 #if EV_PERIODIC_ENABLE
+static void noinline
+periodic_recalc (EV_P_ ev_periodic *w)
+{
+  ev_tstamp interval = w->interval > MIN_INTERVAL ? w->interval : MIN_INTERVAL;
+  ev_tstamp at = w->offset + interval * ev_floor ((ev_rt_now - w->offset) / interval);
+  /* the above almost always errs on the low side */
+  while (at <= ev_rt_now)
+    {
+      ev_tstamp nat = at + w->interval;
+      /* when resolution fails us, we use ev_rt_now */
+      if (expect_false (nat == at))
+        {
+          at = ev_rt_now;
+          break;
+        }
+      at = nat;
+    }
+  ev_at (w) = at;
+}
 /* make periodics pending */
 inline_size void
 periodics_reify (EV_P)
 {
   EV_FREQUENT_CHECK;
   while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now)
     {
-      int feed_count = 0;
       do
         {
           ev_periodic *w = (ev_periodic *)ANHE_w (periodics [HEAP0]);
           /*assert (("libev: inactive timer on periodic heap detected", ev_is_active (w)));*/
               ANHE_at_cache (periodics [HEAP0]);
               downheap (periodics, periodiccnt, HEAP0);
             }
           else if (w->interval)
             {
-              ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
+              periodic_recalc (EV_A_ w);
-              /* if next trigger time is not sufficiently in the future, put it there */
-              /* this might happen because of floating point inexactness */
-              if (ev_at (w) - ev_rt_now < TIME_EPSILON)
-                {
-                  ev_at (w) += w->interval;
-                  /* if interval is unreasonably low we might still have a time in the past */
-                  /* so correct this. this will make the periodic very inexact, but the user */
-                  /* has effectively asked to get triggered more often than possible */
-                  if (ev_at (w) < ev_rt_now)
-                    ev_at (w) = ev_rt_now;
-                }
               ANHE_at_cache (periodics [HEAP0]);
               downheap (periodics, periodiccnt, HEAP0);
             }
           else
             ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
     }
 }
 /* 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 */
       ev_periodic *w = (ev_periodic *)ANHE_w (periodics [i]);
       if (w->reschedule_cb)
         ev_at (w) = w->reschedule_cb (w, ev_rt_now);
       else if (w->interval)
-        ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
+        periodic_recalc (EV_A_ w);
       ANHE_at_cache (periodics [i]);
     }
   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)
        * doesn't hurt either as we only do this on time-jumps or
        * in the unlikely event of having been preempted here.
        */
       for (i = 4; --i; )
         {
+          ev_tstamp diff;
           rtmn_diff = ev_rt_now - mn_now;
+          diff = odiff - rtmn_diff;
-          if (expect_true (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP))
+          if (expect_true ((diff < 0. ? -diff : diff) < MIN_TIMEJUMP))
             return; /* all is well */
           ev_rt_now = ev_time ();
           mn_now    = get_clock ();
           now_floor = mn_now;
       mn_now = ev_rt_now;
     }
 }
-void
+int
 ev_run (EV_P_ int flags)
 {
 #if EV_FEATURE_API
   ++loop_depth;
 #endif
         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_fudge;
+                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_fudge;
+                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);
-                if (sleeptime > waittime - backend_fudge)
+                if (sleeptime > waittime - backend_mintime)
-                  sleeptime = waittime - backend_fudge;
+                  sleeptime = waittime - backend_mintime;
                 if (expect_true (sleeptime > 0.))
                   {
                     ev_sleep (sleeptime);
                     waittime -= sleeptime;
 #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 */
+        ECB_MEMORY_FENCE_ACQUIRE;
+        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 */
     loop_done = EVBREAK_CANCEL;
 #if EV_FEATURE_API
   --loop_depth;
 #endif
+  return activecnt;
 }
 void
-ev_break (EV_P_ int how)
+ev_break (EV_P_ int how) EV_THROW
 {
   loop_done = how;
 }
 void
-ev_ref (EV_P)
+ev_ref (EV_P) EV_THROW
 {
   ++activecnt;
 }
 void
-ev_unref (EV_P)
+ev_unref (EV_P) EV_THROW
 {
   --activecnt;
 }
 void
-ev_now_update (EV_P)
+ev_now_update (EV_P) EV_THROW
 {
   time_update (EV_A_ 1e100);
 }
 void
-ev_suspend (EV_P)
+ev_suspend (EV_P) EV_THROW
 {
   ev_now_update (EV_A);
 }
 void
-ev_resume (EV_P)
+ev_resume (EV_P) EV_THROW
 {
   ev_tstamp mn_prev = mn_now;
   ev_now_update (EV_A);
   timers_reschedule (EV_A_ mn_now - mn_prev);
       w->pending = 0;
     }
 }
 int
-ev_clear_pending (EV_P_ void *w)
+ev_clear_pending (EV_P_ void *w) EV_THROW
 {
   W w_ = (W)w;
   int pending = w_->pending;
   if (expect_true (pending))
 }
 /*****************************************************************************/
 void noinline
-ev_io_start (EV_P_ ev_io *w)
+ev_io_start (EV_P_ ev_io *w) EV_THROW
 {
   int fd = w->fd;
   if (expect_false (ev_is_active (w)))
     return;
   ev_start (EV_A_ (W)w, 1);
   array_needsize (ANFD, anfds, anfdmax, fd + 1, array_init_zero);
   wlist_add (&anfds[fd].head, (WL)w);
+  /* common bug, apparently */
+  assert (("libev: ev_io_start called with corrupted watcher", ((WL)w)->next != (WL)w));
   fd_change (EV_A_ fd, w->events & EV__IOFDSET | EV_ANFD_REIFY);
   w->events &= ~EV__IOFDSET;
   EV_FREQUENT_CHECK;
 }
 void noinline
-ev_io_stop (EV_P_ ev_io *w)
+ev_io_stop (EV_P_ ev_io *w) EV_THROW
 {
   clear_pending (EV_A_ (W)w);
   if (expect_false (!ev_is_active (w)))
     return;
   EV_FREQUENT_CHECK;
 }
 void noinline
-ev_timer_start (EV_P_ ev_timer *w)
+ev_timer_start (EV_P_ ev_timer *w) EV_THROW
 {
   if (expect_false (ev_is_active (w)))
     return;
   ev_at (w) += mn_now;
   /*assert (("libev: internal timer heap corruption", timers [ev_active (w)] == (WT)w));*/
 }
 void noinline
-ev_timer_stop (EV_P_ ev_timer *w)
+ev_timer_stop (EV_P_ ev_timer *w) EV_THROW
 {
   clear_pending (EV_A_ (W)w);
   if (expect_false (!ev_is_active (w)))
     return;
   EV_FREQUENT_CHECK;
 }
 void noinline
-ev_timer_again (EV_P_ ev_timer *w)
+ev_timer_again (EV_P_ ev_timer *w) EV_THROW
 {
   EV_FREQUENT_CHECK;
+  clear_pending (EV_A_ (W)w);
   if (ev_is_active (w))
     {
       if (w->repeat)
         {
   EV_FREQUENT_CHECK;
 }
 ev_tstamp
-ev_timer_remaining (EV_P_ ev_timer *w)
+ev_timer_remaining (EV_P_ ev_timer *w) EV_THROW
 {
   return ev_at (w) - (ev_is_active (w) ? mn_now : 0.);
 }
 #if EV_PERIODIC_ENABLE
 void noinline
-ev_periodic_start (EV_P_ ev_periodic *w)
+ev_periodic_start (EV_P_ ev_periodic *w) EV_THROW
 {
   if (expect_false (ev_is_active (w)))
     return;
   if (w->reschedule_cb)
     ev_at (w) = w->reschedule_cb (w, ev_rt_now);
   else if (w->interval)
     {
       assert (("libev: ev_periodic_start called with negative interval value", w->interval >= 0.));
-      /* this formula differs from the one in periodic_reify because we do not always round up */
+      periodic_recalc (EV_A_ w);
-      ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
     }
   else
     ev_at (w) = w->offset;
   EV_FREQUENT_CHECK;
   /*assert (("libev: internal periodic heap corruption", ANHE_w (periodics [ev_active (w)]) == (WT)w));*/
 }
 void noinline
-ev_periodic_stop (EV_P_ ev_periodic *w)
+ev_periodic_stop (EV_P_ ev_periodic *w) EV_THROW
 {
   clear_pending (EV_A_ (W)w);
   if (expect_false (!ev_is_active (w)))
     return;
   EV_FREQUENT_CHECK;
 }
 void noinline
-ev_periodic_again (EV_P_ ev_periodic *w)
+ev_periodic_again (EV_P_ ev_periodic *w) EV_THROW
 {
   /* TODO: use adjustheap and recalculation */
   ev_periodic_stop (EV_A_ w);
   ev_periodic_start (EV_A_ w);
 }
 #endif
 #if EV_SIGNAL_ENABLE
 void noinline
-ev_signal_start (EV_P_ ev_signal *w)
+ev_signal_start (EV_P_ ev_signal *w) EV_THROW
 {
   if (expect_false (ev_is_active (w)))
     return;
   assert (("libev: ev_signal_start called with illegal signal number", w->signum > 0 && w->signum < EV_NSIG));
         sa.sa_handler = ev_sighandler;
         sigfillset (&sa.sa_mask);
         sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
         sigaction (w->signum, &sa, 0);
+        if (origflags & EVFLAG_NOSIGMASK)
+          {
-        sigemptyset (&sa.sa_mask);
+            sigemptyset (&sa.sa_mask);
-        sigaddset (&sa.sa_mask, w->signum);
+            sigaddset (&sa.sa_mask, w->signum);
-        sigprocmask (SIG_UNBLOCK, &sa.sa_mask, 0);
+            sigprocmask (SIG_UNBLOCK, &sa.sa_mask, 0);
+          }
 #endif
       }
   EV_FREQUENT_CHECK;
 }
 void noinline
-ev_signal_stop (EV_P_ ev_signal *w)
+ev_signal_stop (EV_P_ ev_signal *w) EV_THROW
 {
   clear_pending (EV_A_ (W)w);
   if (expect_false (!ev_is_active (w)))
     return;
 #endif
 #if EV_CHILD_ENABLE
 void
-ev_child_start (EV_P_ ev_child *w)
+ev_child_start (EV_P_ ev_child *w) EV_THROW
 {
 #if EV_MULTIPLICITY
   assert (("libev: child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
 #endif
   if (expect_false (ev_is_active (w)))
   EV_FREQUENT_CHECK;
 }
 void
-ev_child_stop (EV_P_ ev_child *w)
+ev_child_stop (EV_P_ ev_child *w) EV_THROW
 {
   clear_pending (EV_A_ (W)w);
   if (expect_false (!ev_is_active (w)))
     return;
               if (!pend || pend == path)
                 break;
               *pend = 0;
               w->wd = inotify_add_watch (fs_fd, path, mask);
             }
           while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
         }
     }
   if (w->wd >= 0)
       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
    */
 }
 inline_size int
 infy_newfd (void)
 {
-#if defined (IN_CLOEXEC) && defined (IN_NONBLOCK)
+#if defined IN_CLOEXEC && defined IN_NONBLOCK
   int fd = inotify_init1 (IN_CLOEXEC | IN_NONBLOCK);
   if (fd >= 0)
     return fd;
 #endif
   return inotify_init ();
 #else
 # define EV_LSTAT(p,b) lstat (p, b)
 #endif
 void
-ev_stat_stat (EV_P_ ev_stat *w)
+ev_stat_stat (EV_P_ ev_stat *w) EV_THROW
 {
   if (lstat (w->path, &w->attr) < 0)
     w->attr.st_nlink = 0;
   else if (!w->attr.st_nlink)
     w->attr.st_nlink = 1;
       ev_feed_event (EV_A_ w, EV_STAT);
     }
 }
 void
-ev_stat_start (EV_P_ ev_stat *w)
+ev_stat_start (EV_P_ ev_stat *w) EV_THROW
 {
   if (expect_false (ev_is_active (w)))
     return;
   ev_stat_stat (EV_A_ w);
   EV_FREQUENT_CHECK;
 }
 void
-ev_stat_stop (EV_P_ ev_stat *w)
+ev_stat_stop (EV_P_ ev_stat *w) EV_THROW
 {
   clear_pending (EV_A_ (W)w);
   if (expect_false (!ev_is_active (w)))
     return;
 }
 #endif
 #if EV_IDLE_ENABLE
 void
-ev_idle_start (EV_P_ ev_idle *w)
+ev_idle_start (EV_P_ ev_idle *w) EV_THROW
 {
   if (expect_false (ev_is_active (w)))
     return;
   pri_adjust (EV_A_ (W)w);
   EV_FREQUENT_CHECK;
 }
 void
-ev_idle_stop (EV_P_ ev_idle *w)
+ev_idle_stop (EV_P_ ev_idle *w) EV_THROW
 {
   clear_pending (EV_A_ (W)w);
   if (expect_false (!ev_is_active (w)))
     return;
 }
 #endif
 #if EV_PREPARE_ENABLE
 void
-ev_prepare_start (EV_P_ ev_prepare *w)
+ev_prepare_start (EV_P_ ev_prepare *w) EV_THROW
 {
   if (expect_false (ev_is_active (w)))
     return;
   EV_FREQUENT_CHECK;
   EV_FREQUENT_CHECK;
 }
 void
-ev_prepare_stop (EV_P_ ev_prepare *w)
+ev_prepare_stop (EV_P_ ev_prepare *w) EV_THROW
 {
   clear_pending (EV_A_ (W)w);
   if (expect_false (!ev_is_active (w)))
     return;
 }
 #endif
 #if EV_CHECK_ENABLE
 void
-ev_check_start (EV_P_ ev_check *w)
+ev_check_start (EV_P_ ev_check *w) EV_THROW
 {
   if (expect_false (ev_is_active (w)))
     return;
   EV_FREQUENT_CHECK;
   EV_FREQUENT_CHECK;
 }
 void
-ev_check_stop (EV_P_ ev_check *w)
+ev_check_stop (EV_P_ ev_check *w) EV_THROW
 {
   clear_pending (EV_A_ (W)w);
   if (expect_false (!ev_is_active (w)))
     return;
 }
 #endif
 #if EV_EMBED_ENABLE
 void noinline
-ev_embed_sweep (EV_P_ ev_embed *w)
+ev_embed_sweep (EV_P_ ev_embed *w) EV_THROW
 {
   ev_run (w->other, EVRUN_NOWAIT);
 }
 static void
   ev_idle_stop (EV_A_ idle);
 }
 #endif
 void
-ev_embed_start (EV_P_ ev_embed *w)
+ev_embed_start (EV_P_ ev_embed *w) EV_THROW
 {
   if (expect_false (ev_is_active (w)))
     return;
   {
   EV_FREQUENT_CHECK;
 }
 void
-ev_embed_stop (EV_P_ ev_embed *w)
+ev_embed_stop (EV_P_ ev_embed *w) EV_THROW
 {
   clear_pending (EV_A_ (W)w);
   if (expect_false (!ev_is_active (w)))
     return;
 }
 #endif
 #if EV_FORK_ENABLE
 void
-ev_fork_start (EV_P_ ev_fork *w)
+ev_fork_start (EV_P_ ev_fork *w) EV_THROW
 {
   if (expect_false (ev_is_active (w)))
     return;
   EV_FREQUENT_CHECK;
   EV_FREQUENT_CHECK;
 }
 void
-ev_fork_stop (EV_P_ ev_fork *w)
+ev_fork_stop (EV_P_ ev_fork *w) EV_THROW
 {
   clear_pending (EV_A_ (W)w);
   if (expect_false (!ev_is_active (w)))
     return;
   EV_FREQUENT_CHECK;
 }
 #endif
+#if EV_CLEANUP_ENABLE
+void
+ev_cleanup_start (EV_P_ ev_cleanup *w) EV_THROW
+{
+  if (expect_false (ev_is_active (w)))
+    return;
+  EV_FREQUENT_CHECK;
+  ev_start (EV_A_ (W)w, ++cleanupcnt);
+  array_needsize (ev_cleanup *, cleanups, cleanupmax, cleanupcnt, EMPTY2);
+  cleanups [cleanupcnt - 1] = w;
+  /* cleanup watchers should never keep a refcount on the loop */
+  ev_unref (EV_A);
+  EV_FREQUENT_CHECK;
+}
+void
+ev_cleanup_stop (EV_P_ ev_cleanup *w) EV_THROW
+{
+  clear_pending (EV_A_ (W)w);
+  if (expect_false (!ev_is_active (w)))
+    return;
+  EV_FREQUENT_CHECK;
+  ev_ref (EV_A);
+  {
+    int active = ev_active (w);
+    cleanups [active - 1] = cleanups [--cleanupcnt];
+    ev_active (cleanups [active - 1]) = active;
+  }
+  ev_stop (EV_A_ (W)w);
+  EV_FREQUENT_CHECK;
+}
+#endif
 #if EV_ASYNC_ENABLE
 void
-ev_async_start (EV_P_ ev_async *w)
+ev_async_start (EV_P_ ev_async *w) EV_THROW
 {
   if (expect_false (ev_is_active (w)))
     return;
   w->sent = 0;
   EV_FREQUENT_CHECK;
 }
 void
-ev_async_stop (EV_P_ ev_async *w)
+ev_async_stop (EV_P_ ev_async *w) EV_THROW
 {
   clear_pending (EV_A_ (W)w);
   if (expect_false (!ev_is_active (w)))
     return;
   EV_FREQUENT_CHECK;
 }
 void
-ev_async_send (EV_P_ ev_async *w)
+ev_async_send (EV_P_ ev_async *w) EV_THROW
 {
   w->sent = 1;
   evpipe_write (EV_A_ &async_pending);
 }
 #endif
   once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->io));
 }
 void
-ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
+ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg) EV_THROW
 {
   struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
   if (expect_false (!once))
     {
 }
 /*****************************************************************************/
 #if EV_WALK_ENABLE
-void
+void ecb_cold
-ev_walk (EV_P_ int types, void (*cb)(EV_P_ int type, void *w))
+ev_walk (EV_P_ int types, void (*cb)(EV_P_ int type, void *w)) EV_THROW
 {
   int i, j;
   ev_watcher_list *wl, *wn;
   if (types & (EV_IO | EV_EMBED))
       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 1.355 by root, Fri Oct 22 10:09:12 2010 UTC vs. Revision 1.447 by root, Tue Jun 19 12:29:43 2012 UTC

Diff Legend

Comparing libev/ev.c (file contents):
Revision 1.355 by root, Fri Oct 22 10:09:12 2010 UTC vs.
Revision 1.447 by root, Tue Jun 19 12:29:43 2012 UTC