libev/ev.c

/*
 * libev event processing core, watcher management
 *
 * Copyright (c) 2007-2019 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,
 * 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.
 *
 * Alternatively, the contents of this file may be used under the terms of
 * the GNU General Public License ("GPL") version 2 or any later version,
 * in which case the provisions of the GPL are applicable instead of
 * the above. If you wish to allow the use of your version of this file
 * only under the terms of the GPL and not to allow others to use your
 * version of this file under the BSD license, indicate your decision
 * by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL. If you do not delete the
 * provisions above, a recipient may use your version of this file under
 * either the BSD or the GPL.
 */

/* this big block deduces configuration from config.h */
#ifndef EV_STANDALONE
# ifdef EV_CONFIG_H
#  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
#  define EV_USE_CLOCK_SYSCALL 0
# endif

# if HAVE_CLOCK_GETTIME
#  ifndef EV_USE_MONOTONIC
#   define EV_USE_MONOTONIC 1
#  endif
#  ifndef EV_USE_REALTIME
#   define EV_USE_REALTIME  0
#  endif
# else
#  ifndef EV_USE_MONOTONIC
#   define EV_USE_MONOTONIC 0
#  endif
#  ifndef EV_USE_REALTIME
#   define EV_USE_REALTIME  0
#  endif
# endif

# if HAVE_NANOSLEEP
#  ifndef EV_USE_NANOSLEEP
#    define EV_USE_NANOSLEEP EV_FEATURE_OS
#  endif
# else
#   undef EV_USE_NANOSLEEP
#   define EV_USE_NANOSLEEP 0
# endif

# if HAVE_SELECT && HAVE_SYS_SELECT_H
#  ifndef EV_USE_SELECT
#   define EV_USE_SELECT EV_FEATURE_BACKENDS
#  endif
# else
#  undef EV_USE_SELECT
#  define EV_USE_SELECT 0
# endif

# if HAVE_POLL && HAVE_POLL_H
#  ifndef EV_USE_POLL
#   define EV_USE_POLL EV_FEATURE_BACKENDS
#  endif
# else
#  undef EV_USE_POLL
#  define EV_USE_POLL 0
# endif
   
# if HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
#  ifndef EV_USE_EPOLL
#   define EV_USE_EPOLL EV_FEATURE_BACKENDS
#  endif
# else
#  undef EV_USE_EPOLL
#  define EV_USE_EPOLL 0
# endif
   
# if HAVE_LINUX_AIO_ABI_H
#  ifndef EV_USE_LINUXAIO
#   define EV_USE_LINUXAIO EV_FEATURE_BACKENDS
#  endif
# else
#  undef EV_USE_LINUXAIO
#  define EV_USE_LINUXAIO 0
# endif
   
# if HAVE_KQUEUE && HAVE_SYS_EVENT_H
#  ifndef EV_USE_KQUEUE
#   define EV_USE_KQUEUE EV_FEATURE_BACKENDS
#  endif
# else
#  undef EV_USE_KQUEUE
#  define EV_USE_KQUEUE 0
# endif
   
# if HAVE_PORT_H && HAVE_PORT_CREATE
#  ifndef EV_USE_PORT
#   define EV_USE_PORT EV_FEATURE_BACKENDS
#  endif
# else
#  undef EV_USE_PORT
#  define EV_USE_PORT 0
# endif

# if HAVE_INOTIFY_INIT && HAVE_SYS_INOTIFY_H
#  ifndef EV_USE_INOTIFY
#   define EV_USE_INOTIFY EV_FEATURE_OS
#  endif
# else
#  undef EV_USE_INOTIFY
#  define EV_USE_INOTIFY 0
# endif

# if HAVE_SIGNALFD && HAVE_SYS_SIGNALFD_H
#  ifndef EV_USE_SIGNALFD
#   define EV_USE_SIGNALFD EV_FEATURE_OS
#  endif
# else
#  undef EV_USE_SIGNALFD
#  define EV_USE_SIGNALFD 0
# endif

# if HAVE_EVENTFD
#  ifndef EV_USE_EVENTFD
#   define EV_USE_EVENTFD EV_FEATURE_OS
#  endif
# else
#  undef EV_USE_EVENTFD
#  define EV_USE_EVENTFD 0
# endif
 
#endif

/* OS X, in its infinite idiocy, actually HARDCODES
 * a limit of 1024 into their select. Where people have brains,
 * OS X engineers apparently have a vacuum. Or maybe they were
 * ordered to have a vacuum, or they do anything for money.
 * This might help. Or not.
 * Note that this must be defined early, as other include files
 * will rely on this define as well.
 */
#define _DARWIN_UNLIMITED_SELECT 1

#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <stddef.h>

#include <stdio.h>

#include <assert.h>
#include <errno.h>
#include <sys/types.h>
#include <time.h>
#include <limits.h>

#include <signal.h>

#ifdef EV_H
# include EV_H
#else
# include "ev.h"
#endif

#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
#endif

/* 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
/* use what's provided */
#elif defined NSIG
# define EV_NSIG (NSIG)
#elif defined _NSIG
# define EV_NSIG (_NSIG)
#elif defined SIGMAX
# define EV_NSIG (SIGMAX+1)
#elif defined SIG_MAX
# define EV_NSIG (SIG_MAX+1)
#elif defined _SIG_MAX
# define EV_NSIG (_SIG_MAX+1)
#elif defined MAXSIG
# define EV_NSIG (MAXSIG+1)
#elif defined MAX_SIG
# define EV_NSIG (MAX_SIG+1)
#elif defined SIGARRAYSIZE
# define EV_NSIG (SIGARRAYSIZE) /* Assume ary[SIGARRAYSIZE] */
#elif defined _sys_nsig
# define EV_NSIG (_sys_nsig) /* Solaris 2.5 */
#else
# define EV_NSIG (8 * sizeof (sigset_t) + 1)
#endif

#ifndef EV_USE_FLOOR
# define EV_USE_FLOOR 0
#endif

#ifndef EV_USE_CLOCK_SYSCALL
# if __linux && __GLIBC__ == 2 && __GLIBC_MINOR__ < 17
#  define EV_USE_CLOCK_SYSCALL EV_FEATURE_OS
# else
#  define EV_USE_CLOCK_SYSCALL 0
# endif
#endif

#if !(_POSIX_TIMERS > 0)
# ifndef EV_USE_MONOTONIC
#  define EV_USE_MONOTONIC 0
# endif
# ifndef EV_USE_REALTIME
#  define EV_USE_REALTIME 0
# endif
#endif

#ifndef EV_USE_MONOTONIC
# if defined _POSIX_MONOTONIC_CLOCK && _POSIX_MONOTONIC_CLOCK >= 0
#  define EV_USE_MONOTONIC EV_FEATURE_OS
# else
#  define EV_USE_MONOTONIC 0
# endif
#endif

#ifndef EV_USE_REALTIME
# define EV_USE_REALTIME !EV_USE_CLOCK_SYSCALL
#endif

#ifndef EV_USE_NANOSLEEP
# if _POSIX_C_SOURCE >= 199309L
#  define EV_USE_NANOSLEEP EV_FEATURE_OS
# else
#  define EV_USE_NANOSLEEP 0
# endif
#endif

#ifndef EV_USE_SELECT
# define EV_USE_SELECT EV_FEATURE_BACKENDS
#endif

#ifndef EV_USE_POLL
# ifdef _WIN32
#  define EV_USE_POLL 0
# else
#  define EV_USE_POLL EV_FEATURE_BACKENDS
# endif
#endif

#ifndef EV_USE_EPOLL
# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
#  define EV_USE_EPOLL EV_FEATURE_BACKENDS
# else
#  define EV_USE_EPOLL 0
# endif
#endif

#ifndef EV_USE_KQUEUE
# define EV_USE_KQUEUE 0
#endif

#ifndef EV_USE_PORT
# define EV_USE_PORT 0
#endif

#ifndef EV_USE_LINUXAIO
# if __linux /* libev currently assumes linux/aio_abi.h is always available on linux */
#  define EV_USE_LINUXAIO 1
# else
#  define EV_USE_LINUXAIO 0
# endif
#endif

#ifndef EV_USE_IOURING
# if __linux
#  define EV_USE_IOURING 0
# else
#  define EV_USE_IOURING 0
# endif
#endif

#ifndef EV_USE_INOTIFY
# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
#  define EV_USE_INOTIFY EV_FEATURE_OS
# else
#  define EV_USE_INOTIFY 0
# endif
#endif

#ifndef EV_PID_HASHSIZE
# define EV_PID_HASHSIZE EV_FEATURE_DATA ? 16 : 1
#endif

#ifndef EV_INOTIFY_HASHSIZE
# define EV_INOTIFY_HASHSIZE EV_FEATURE_DATA ? 16 : 1
#endif

#ifndef EV_USE_EVENTFD
# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
#  define EV_USE_EVENTFD EV_FEATURE_OS
# else
#  define EV_USE_EVENTFD 0
# endif
#endif

#ifndef EV_USE_SIGNALFD
# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
#  define EV_USE_SIGNALFD EV_FEATURE_OS
# else
#  define EV_USE_SIGNALFD 0
# endif
#endif

#if 0 /* debugging */
# define EV_VERIFY 3
# define EV_USE_4HEAP 1
# define EV_HEAP_CACHE_AT 1
#endif

#ifndef EV_VERIFY
# define EV_VERIFY (EV_FEATURE_API ? 1 : 0)
#endif

#ifndef EV_USE_4HEAP
# define EV_USE_4HEAP EV_FEATURE_DATA
#endif

#ifndef EV_HEAP_CACHE_AT
# define EV_HEAP_CACHE_AT EV_FEATURE_DATA
#endif

#ifdef __ANDROID__
/* supposedly, android doesn't typedef fd_mask */
# undef EV_USE_SELECT
# define EV_USE_SELECT 0
/* supposedly, we need to include syscall.h, not sys/syscall.h, so just disable */
# undef EV_USE_CLOCK_SYSCALL
# define EV_USE_CLOCK_SYSCALL 0
#endif

/* aix's poll.h seems to cause lots of trouble */
#ifdef _AIX
/* AIX has a completely broken poll.h header */
# undef EV_USE_POLL
# define EV_USE_POLL 0
#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 <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
#  define EV_NEED_SYSCALL 1
# else
#  undef EV_USE_CLOCK_SYSCALL
#  define EV_USE_CLOCK_SYSCALL 0
# endif
#endif

/* this block fixes any misconfiguration where we know we run into trouble otherwise */

#ifndef CLOCK_MONOTONIC
# undef EV_USE_MONOTONIC
# define EV_USE_MONOTONIC 0
#endif

#ifndef CLOCK_REALTIME
# undef EV_USE_REALTIME
# define EV_USE_REALTIME 0
#endif

#if !EV_STAT_ENABLE
# undef EV_USE_INOTIFY
# define EV_USE_INOTIFY 0
#endif

#if !EV_USE_NANOSLEEP
/* 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_LINUXAIO
# include <sys/syscall.h>
# if SYS_io_getevents && EV_USE_EPOLL /* linuxaio backend requires epoll backend */
#  define EV_NEED_SYSCALL 1
# else
#  undef EV_USE_LINUXAIO
#  define EV_USE_LINUXAIO 0
# endif
#endif

#if EV_USE_IOURING
# include <sys/syscall.h>
# if !SYS_io_uring_setup && __linux && !__alpha
#  define SYS_io_uring_setup     425
#  define SYS_io_uring_enter     426
#  define SYS_io_uring_wregister 427
# endif
# if SYS_io_uring_setup && EV_USE_EPOLL /* iouring backend requires epoll backend */
#  define EV_NEED_SYSCALL 1
# else
#  undef EV_USE_IOURING
#  define EV_USE_IOURING 0
# endif
#endif

#if EV_USE_INOTIFY
# 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_USE_EVENTFD
/* our minimum requirement is glibc 2.7 which has the stub, but not the header */
# include <stdint.h>
# ifndef EFD_NONBLOCK
#  define EFD_NONBLOCK O_NONBLOCK
# endif
# ifndef EFD_CLOEXEC
#  ifdef O_CLOEXEC
#   define EFD_CLOEXEC O_CLOEXEC
#  else
#   define EFD_CLOEXEC 02000000
#  endif
# endif
EV_CPP(extern "C") int (eventfd) (unsigned int initval, int flags);
#endif

#if EV_USE_SIGNALFD
/* our minimum requirement is glibc 2.7 which has the stub, but not the header */
# include <stdint.h>
# ifndef SFD_NONBLOCK
#  define SFD_NONBLOCK O_NONBLOCK
# endif
# ifndef SFD_CLOEXEC
#  ifdef O_CLOEXEC
#   define SFD_CLOEXEC O_CLOEXEC
#  else
#   define SFD_CLOEXEC 02000000
#  endif
# endif
EV_CPP (extern "C") int signalfd (int fd, const sigset_t *mask, int flags);

struct signalfd_siginfo
{
  uint32_t ssi_signo;
  char pad[128 - sizeof (uint32_t)];
};
#endif

/*****************************************************************************/

#if EV_VERIFY >= 3
# define EV_FREQUENT_CHECK ev_verify (EV_A)
#else
# define EV_FREQUENT_CHECK do { } while (0)
#endif

/*
 * This is used to work around floating point rounding problems.
 * This value is good at least till the year 4000.
 */
#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) */

/* find a portable timestamp that is "alawys" in the future but fits into time_t.
 * this is quite hard, and we are mostly guessing - we handle 32 bit signed/unsigned time_t,
 * and sizes large than 32 bit, but and maybe the unlikely loating point time_t */
#define EV_TSTAMP_HUGE \
  (sizeof (time_t) >= 8     ? 10000000000000.  \
   : 0 < (time_t)4294967295 ?     4294967295.  \
   :                              2147483647.) \

#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 (©) 2009-2015 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.
 *
 * Alternatively, the contents of this file may be used under the terms of
 * the GNU General Public License ("GPL") version 2 or any later version,
 * in which case the provisions of the GPL are applicable instead of
 * the above. If you wish to allow the use of your version of this file
 * only under the terms of the GPL and not to allow others to use your
 * version of this file under the BSD license, indicate your decision
 * by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL. If you do not delete the
 * provisions above, a recipient may use your version of this file under
 * either the BSD or the GPL.
 */

#ifndef ECB_H
#define ECB_H

/* 16 bits major, 16 bits minor */
#define ECB_VERSION 0x00010006

#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__
    typedef   signed long long int64_t;
    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
#else
  #include <inttypes.h>
  #if (defined INTPTR_MAX ? INTPTR_MAX : ULONG_MAX) > 0xffffffffU
    #define ECB_PTRSIZE 8
  #else
    #define ECB_PTRSIZE 4
  #endif
#endif

#define ECB_GCC_AMD64 (__amd64 || __amd64__ || __x86_64 || __x86_64__)
#define ECB_MSVC_AMD64 (_M_AMD64 || _M_X64)

/* work around x32 idiocy by defining proper macros */
#if ECB_GCC_AMD64 || ECB_MSVC_AMD64
  #if _ILP32
    #define ECB_AMD64_X32 1
  #else
    #define ECB_AMD64 1
  #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.
 */
#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

#define ECB_CLANG_VERSION(major,minor) (__clang_major__ > (major) || (__clang_major__ == (major) && __clang_minor__ >= (minor)))

#if __clang__ && defined __has_builtin
  #define ECB_CLANG_BUILTIN(x) __has_builtin (x)
#else
  #define ECB_CLANG_BUILTIN(x) 0
#endif

#if __clang__ && defined __has_extension
  #define ECB_CLANG_EXTENSION(x) __has_extension (x)
#else
  #define ECB_CLANG_EXTENSION(x) 0
#endif

#define ECB_CPP   (__cplusplus+0)
#define ECB_CPP11 (__cplusplus >= 201103L)
#define ECB_CPP14 (__cplusplus >= 201402L)
#define ECB_CPP17 (__cplusplus >= 201703L)

#if ECB_CPP
  #define ECB_C            0
  #define ECB_STDC_VERSION 0
#else
  #define ECB_C            1
  #define ECB_STDC_VERSION __STDC_VERSION__
#endif

#define ECB_C99   (ECB_STDC_VERSION >= 199901L)
#define ECB_C11   (ECB_STDC_VERSION >= 201112L)
#define ECB_C17   (ECB_STDC_VERSION >= 201710L)

#if ECB_CPP
  #define ECB_EXTERN_C extern "C"
  #define ECB_EXTERN_C_BEG ECB_EXTERN_C {
  #define ECB_EXTERN_C_END }
#else
  #define ECB_EXTERN_C extern
  #define ECB_EXTERN_C_BEG
  #define ECB_EXTERN_C_END
#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
  #define ECB_NO_SMP 1
#endif

#if ECB_NO_SMP
  #define ECB_MEMORY_FENCE do { } while (0)
#endif

/* http://www-01.ibm.com/support/knowledgecenter/SSGH3R_13.1.0/com.ibm.xlcpp131.aix.doc/compiler_ref/compiler_builtins.html */
#if __xlC__ && ECB_CPP
  #include <builtins.h>
#endif

#if 1400 <= _MSC_VER
  #include <intrin.h> /* fence functions _ReadBarrier, also bit search functions _BitScanReverse */
#endif

#ifndef ECB_MEMORY_FENCE
  #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
    #define ECB_MEMORY_FENCE_RELAXED __asm__ __volatile__ ("" : : : "memory")
    #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__ (""                        : : : "memory")
    #elif ECB_GCC_AMD64
      #define ECB_MEMORY_FENCE         __asm__ __volatile__ ("mfence"   : : : "memory")
      #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ (""         : : : "memory")
      #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ (""         : : : "memory")
    #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
      #define ECB_MEMORY_FENCE         __asm__ __volatile__ ("sync"     : : : "memory")
    #elif defined __ARM_ARCH_2__ \
      || defined __ARM_ARCH_3__  || defined __ARM_ARCH_3M__  \
      || defined __ARM_ARCH_4__  || defined __ARM_ARCH_4T__  \
      || defined __ARM_ARCH_5__  || defined __ARM_ARCH_5E__  \
      || defined __ARM_ARCH_5T__ || defined __ARM_ARCH_5TE__ \
      || defined __ARM_ARCH_5TEJ__
      /* should not need any, unless running old code on newer cpu - arm doesn't support that */
    #elif defined __ARM_ARCH_6__  || defined __ARM_ARCH_6J__  \
       || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__ \
       || defined __ARM_ARCH_6T2__
      #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_7R__ || defined __ARM_ARCH_7M__
      #define ECB_MEMORY_FENCE         __asm__ __volatile__ ("dmb"      : : : "memory")
    #elif __aarch64__
      #define ECB_MEMORY_FENCE         __asm__ __volatile__ ("dmb ish"  : : : "memory")
    #elif (__sparc || __sparc__) && !(__sparc_v8__ || defined __sparcv8)
      #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__
      /* GNU/Linux emulates sync on mips1 architectures, so we force its use */
      /* anybody else who still uses mips1 is supposed to send in their version, with detection code. */
      #define ECB_MEMORY_FENCE         __asm__ __volatile__ (".set mips2; sync; .set mips0" : : : "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")
    #elif defined __m68k__
      #define ECB_MEMORY_FENCE         __asm__ __volatile__ (""         : : : "memory")
    #elif defined __m88k__
      #define ECB_MEMORY_FENCE         __asm__ __volatile__ ("tb1 0,%%r0,128" : : : "memory")
    #elif defined __sh__
      #define ECB_MEMORY_FENCE         __asm__ __volatile__ (""         : : : "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)
    #define ECB_MEMORY_FENCE_ACQUIRE __atomic_thread_fence (__ATOMIC_ACQUIRE)
    #define ECB_MEMORY_FENCE_RELEASE __atomic_thread_fence (__ATOMIC_RELEASE)
    #define ECB_MEMORY_FENCE_RELAXED __atomic_thread_fence (__ATOMIC_RELAXED)

  #elif ECB_CLANG_EXTENSION(c_atomic)
    /* see comment below (stdatomic.h) about the C11 memory model. */
    #define ECB_MEMORY_FENCE         __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
    #define ECB_MEMORY_FENCE_ACQUIRE __c11_atomic_thread_fence (__ATOMIC_ACQUIRE)
    #define ECB_MEMORY_FENCE_RELEASE __c11_atomic_thread_fence (__ATOMIC_RELEASE)
    #define ECB_MEMORY_FENCE_RELAXED __c11_atomic_thread_fence (__ATOMIC_RELAXED)

  #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
    #define ECB_MEMORY_FENCE         __sync_synchronize ()
  #elif _MSC_VER >= 1500 /* VC++ 2008 */
    /* apparently, microsoft broke all the memory barrier stuff in Visual Studio 2008... */
    #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
    #define ECB_MEMORY_FENCE         _ReadWriteBarrier (); MemoryBarrier()
    #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier (); MemoryBarrier() /* according to msdn, _ReadBarrier is not a load fence */
    #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier (); MemoryBarrier()
  #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_acq_barrier ()
    #define ECB_MEMORY_FENCE_RELEASE __machine_rel_barrier ()
    #define ECB_MEMORY_FENCE_RELAXED __compiler_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>
    #define ECB_MEMORY_FENCE         atomic_thread_fence (memory_order_seq_cst)
    #define ECB_MEMORY_FENCE_ACQUIRE atomic_thread_fence (memory_order_acquire)
    #define ECB_MEMORY_FENCE_RELEASE atomic_thread_fence (memory_order_release)
  #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 !defined ECB_MEMORY_FENCE_RELAXED && defined ECB_MEMORY_FENCE
  #define ECB_MEMORY_FENCE_RELAXED ECB_MEMORY_FENCE /* very heavy-handed */
#endif

/*****************************************************************************/

#if ECB_CPP
  #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_STRINGIFY_EXPR(expr) ((expr), ECB_STRINGIFY_ (expr))

#define ecb_function_ ecb_inline

#if ECB_GCC_VERSION(3,1) || ECB_CLANG_VERSION(2,8)
  #define ecb_attribute(attrlist)        __attribute__ (attrlist)
#else
  #define ecb_attribute(attrlist)
#endif

#if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_constant_p)
  #define ecb_is_constant(expr)          __builtin_constant_p (expr)
#else
  /* possible C11 impl for integral types
  typedef struct ecb_is_constant_struct ecb_is_constant_struct;
  #define ecb_is_constant(expr)          _Generic ((1 ? (struct ecb_is_constant_struct *)0 : (void *)((expr) - (expr)), ecb_is_constant_struct *: 0, default: 1)) */

  #define ecb_is_constant(expr)          0
#endif

#if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_expect)
  #define ecb_expect(expr,value)         __builtin_expect ((expr),(value))
#else
  #define ecb_expect(expr,value)         (expr)
#endif

#if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_prefetch)
  #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
#else
  #define ecb_prefetch(addr,rw,locality)
#endif

/* no emulation for ecb_decltype */
#if ECB_CPP11
  // older implementations might have problems with decltype(x)::type, work around it
  template<class T> struct ecb_decltype_t { typedef T type; };
  #define ecb_decltype(x) ecb_decltype_t<decltype (x)>::type
#elif ECB_GCC_VERSION(3,0) || ECB_CLANG_VERSION(2,8)
  #define ecb_decltype(x) __typeof__ (x)
#endif

#if _MSC_VER >= 1300
  #define ecb_deprecated __declspec (deprecated)
#else
  #define ecb_deprecated ecb_attribute ((__deprecated__))
#endif

#if _MSC_VER >= 1500
  #define ecb_deprecated_message(msg) __declspec (deprecated (msg))
#elif ECB_GCC_VERSION(4,5)
  #define ecb_deprecated_message(msg) ecb_attribute ((__deprecated__ (msg))
#else
  #define ecb_deprecated_message(msg) ecb_deprecated
#endif

#if _MSC_VER >= 1400
  #define ecb_noinline __declspec (noinline)
#else
  #define ecb_noinline ecb_attribute ((__noinline__))
#endif

#define ecb_unused     ecb_attribute ((__unused__))
#define ecb_const      ecb_attribute ((__const__))
#define ecb_pure       ecb_attribute ((__pure__))

#if ECB_C11 || __IBMC_NORETURN
  /* http://www-01.ibm.com/support/knowledgecenter/SSGH3R_13.1.0/com.ibm.xlcpp131.aix.doc/language_ref/noreturn.html */
  #define ecb_noreturn   _Noreturn
#elif ECB_CPP11
  #define ecb_noreturn   [[noreturn]]
#elif _MSC_VER >= 1200
  /* http://msdn.microsoft.com/en-us/library/k6ktzx3s.aspx */
  #define ecb_noreturn   __declspec (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 ecb_expect_false(expr) ecb_expect (!!(expr), 0)
#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) \
    || (ECB_CLANG_BUILTIN(__builtin_clz) && ECB_CLANG_BUILTIN(__builtin_clzll) \
        && ECB_CLANG_BUILTIN(__builtin_ctz) && ECB_CLANG_BUILTIN(__builtin_ctzll) \
        && ECB_CLANG_BUILTIN(__builtin_popcount))
  /* 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_ ecb_const int ecb_ctz32 (uint32_t x);
  ecb_function_ ecb_const int
  ecb_ctz32 (uint32_t x)
  {
#if 1400 <= _MSC_VER && (_M_IX86 || _M_X64 || _M_IA64 || _M_ARM)
    unsigned long r;
    _BitScanForward (&r, x);
    return (int)r;
#else
    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;
#endif
  }

  ecb_function_ ecb_const int ecb_ctz64 (uint64_t x);
  ecb_function_ ecb_const int
  ecb_ctz64 (uint64_t x)
  {
#if 1400 <= _MSC_VER && (_M_X64 || _M_IA64 || _M_ARM)
    unsigned long r;
    _BitScanForward64 (&r, x);
    return (int)r;
#else
    int shift = x & 0xffffffff ? 0 : 32;
    return ecb_ctz32 (x >> shift) + shift;
#endif
  }

  ecb_function_ ecb_const int ecb_popcount32 (uint32_t x);
  ecb_function_ ecb_const 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_ ecb_const int ecb_ld32 (uint32_t x);
  ecb_function_ ecb_const int ecb_ld32 (uint32_t x)
  {
#if 1400 <= _MSC_VER && (_M_IX86 || _M_X64 || _M_IA64 || _M_ARM)
    unsigned long r;
    _BitScanReverse (&r, x);
    return (int)r;
#else
    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;
#endif
  }

  ecb_function_ ecb_const int ecb_ld64 (uint64_t x);
  ecb_function_ ecb_const int ecb_ld64 (uint64_t x)
  {
#if 1400 <= _MSC_VER && (_M_X64 || _M_IA64 || _M_ARM)
    unsigned long r;
    _BitScanReverse64 (&r, x);
    return (int)r;
#else
    int r = 0;

    if (x >> 32) { x >>= 32; r += 32; }

    return r + ecb_ld32 (x);
#endif
  }
#endif

ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x);
ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); }
ecb_function_ ecb_const ecb_bool ecb_is_pot64 (uint64_t x);
ecb_function_ ecb_const ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); }

ecb_function_ ecb_const uint8_t  ecb_bitrev8  (uint8_t  x);
ecb_function_ ecb_const uint8_t  ecb_bitrev8  (uint8_t  x)
{
  return (  (x * 0x0802U & 0x22110U)
          | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
}

ecb_function_ ecb_const uint16_t ecb_bitrev16 (uint16_t x);
ecb_function_ ecb_const 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_ ecb_const uint32_t ecb_bitrev32 (uint32_t x);
ecb_function_ ecb_const 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_ ecb_const int ecb_popcount64 (uint64_t x);
ecb_function_ ecb_const int
ecb_popcount64 (uint64_t x)
{
  return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
}

ecb_inline ecb_const uint8_t  ecb_rotl8  (uint8_t  x, unsigned int count);
ecb_inline ecb_const uint8_t  ecb_rotr8  (uint8_t  x, unsigned int count);
ecb_inline ecb_const uint16_t ecb_rotl16 (uint16_t x, unsigned int count);
ecb_inline ecb_const uint16_t ecb_rotr16 (uint16_t x, unsigned int count);
ecb_inline ecb_const uint32_t ecb_rotl32 (uint32_t x, unsigned int count);
ecb_inline ecb_const uint32_t ecb_rotr32 (uint32_t x, unsigned int count);
ecb_inline ecb_const uint64_t ecb_rotl64 (uint64_t x, unsigned int count);
ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count);

ecb_inline ecb_const uint8_t  ecb_rotl8  (uint8_t  x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }
ecb_inline ecb_const uint8_t  ecb_rotr8  (uint8_t  x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }
ecb_inline ecb_const uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }
ecb_inline ecb_const uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }
ecb_inline ecb_const uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
ecb_inline ecb_const uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
ecb_inline ecb_const uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }

#if ECB_GCC_VERSION(4,3) || (ECB_CLANG_BUILTIN(__builtin_bswap32) && ECB_CLANG_BUILTIN(__builtin_bswap64))
  #if ECB_GCC_VERSION(4,8) || ECB_CLANG_BUILTIN(__builtin_bswap16)
  #define ecb_bswap16(x)  __builtin_bswap16 (x)
  #else
  #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
  #endif
  #define ecb_bswap32(x)  __builtin_bswap32 (x)
  #define ecb_bswap64(x)  __builtin_bswap64 (x)
#elif _MSC_VER
  #include <stdlib.h>
  #define ecb_bswap16(x) ((uint16_t)_byteswap_ushort ((uint16_t)(x)))
  #define ecb_bswap32(x) ((uint32_t)_byteswap_ulong  ((uint32_t)(x)))
  #define ecb_bswap64(x) ((uint64_t)_byteswap_uint64 ((uint64_t)(x)))
#else
  ecb_function_ ecb_const uint16_t ecb_bswap16 (uint16_t x);
  ecb_function_ ecb_const uint16_t
  ecb_bswap16 (uint16_t x)
  {
    return ecb_rotl16 (x, 8);
  }

  ecb_function_ ecb_const uint32_t ecb_bswap32 (uint32_t x);
  ecb_function_ ecb_const uint32_t
  ecb_bswap32 (uint32_t x)
  {
    return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
  }

  ecb_function_ ecb_const uint64_t ecb_bswap64 (uint64_t x);
  ecb_function_ ecb_const 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) || ECB_CLANG_BUILTIN(__builtin_unreachable)
  #define ecb_unreachable() __builtin_unreachable ()
#else
  /* this seems to work fine, but gcc always emits a warning for it :/ */
  ecb_inline ecb_noreturn void ecb_unreachable (void);
  ecb_inline ecb_noreturn void ecb_unreachable (void) { }
#endif

/* try to tell the compiler that some condition is definitely true */
#define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0

ecb_inline ecb_const uint32_t ecb_byteorder_helper (void);
ecb_inline ecb_const uint32_t
ecb_byteorder_helper (void)
{
  /* the union code still generates code under pressure in gcc, */
  /* but less than using pointers, and always seems to */
  /* successfully return a constant. */
  /* the reason why we have this horrible preprocessor mess */
  /* is to avoid it in all cases, at least on common architectures */
  /* or when using a recent enough gcc version (>= 4.6) */
#if (defined __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__) \
    || ((__i386 || __i386__ || _M_IX86 || ECB_GCC_AMD64 || ECB_MSVC_AMD64) && !__VOS__)
  #define ECB_LITTLE_ENDIAN 1
  return 0x44332211;
#elif (defined __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__) \
      || ((__AARCH64EB__ || __MIPSEB__ || __ARMEB__) && !__VOS__)
  #define ECB_BIG_ENDIAN 1
  return 0x11223344;
#else
  union
  {
    uint8_t c[4];
    uint32_t u;
  } u = { 0x11, 0x22, 0x33, 0x44 };
  return u.u;
#endif
}

ecb_inline ecb_const ecb_bool ecb_big_endian    (void);
ecb_inline ecb_const ecb_bool ecb_big_endian    (void) { return ecb_byteorder_helper () == 0x11223344; }
ecb_inline ecb_const ecb_bool ecb_little_endian (void);
ecb_inline ecb_const ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44332211; }

#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 ECB_CPP
  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

ecb_function_ ecb_const uint32_t ecb_binary16_to_binary32 (uint32_t x);
ecb_function_ ecb_const uint32_t
ecb_binary16_to_binary32 (uint32_t x)
{
  unsigned int s = (x & 0x8000) << (31 - 15);
  int          e = (x >> 10) & 0x001f;
  unsigned int m =  x        & 0x03ff;

  if (ecb_expect_false (e == 31))
    /* infinity or NaN */
    e = 255 - (127 - 15);
  else if (ecb_expect_false (!e))
    {
      if (ecb_expect_true (!m))
        /* zero, handled by code below by forcing e to 0 */
        e = 0 - (127 - 15);
      else
        {
          /* subnormal, renormalise */
          unsigned int s = 10 - ecb_ld32 (m);

          m = (m << s) & 0x3ff; /* mask implicit bit */
          e -= s - 1;
        }
    }

  /* e and m now are normalised, or zero, (or inf or nan) */
  e += 127 - 15;

  return s | (e << 23) | (m << (23 - 10));
}

ecb_function_ ecb_const uint16_t ecb_binary32_to_binary16 (uint32_t x);
ecb_function_ ecb_const uint16_t
ecb_binary32_to_binary16 (uint32_t x)
{
  unsigned int s =  (x >> 16) & 0x00008000; /* sign bit, the easy part */
  unsigned int e = ((x >> 23) & 0x000000ff) - (127 - 15); /* the desired exponent */
  unsigned int m =   x        & 0x007fffff;

  x &= 0x7fffffff;

  /* if it's within range of binary16 normals, use fast path */
  if (ecb_expect_true (0x38800000 <= x && x <= 0x477fefff))
    {
      /* mantissa round-to-even */
      m += 0x00000fff + ((m >> (23 - 10)) & 1);

      /* handle overflow */
      if (ecb_expect_false (m >= 0x00800000))
        {
          m >>= 1;
          e +=  1;
        }

      return s | (e << 10) | (m >> (23 - 10));
    }

  /* handle large numbers and infinity */
  if (ecb_expect_true (0x477fefff < x && x <= 0x7f800000))
    return s | 0x7c00;

  /* handle zero, subnormals and small numbers */
  if (ecb_expect_true (x < 0x38800000))
    {
      /* zero */
      if (ecb_expect_true (!x))
        return s;

      /* handle subnormals */

      /* too small, will be zero */
      if (e < (14 - 24)) /* might not be sharp, but is good enough */
        return s;

      m |= 0x00800000; /* make implicit bit explicit */

      /* very tricky - we need to round to the nearest e (+10) bit value */
      {
        unsigned int bits = 14 - e;
        unsigned int half = (1 << (bits - 1)) - 1;
        unsigned int even = (m >> bits) & 1;

        /* if this overflows, we will end up with a normalised number */
        m = (m + half + even) >> bits;
      }

      return s | m;
    }

  /* handle NaNs, preserve leftmost nan bits, but make sure we don't turn them into infinities */
  m >>= 13;

  return s | 0x7c00 | m | !m;
}

/*******************************************************************************/
/* floating point stuff, can be disabled by defining ECB_NO_LIBM */

/* basically, everything uses "ieee pure-endian" floating point numbers */
/* the only noteworthy exception is ancient armle, which uses order 43218765 */
#if 0 \
    || __i386 || __i386__ \
    || ECB_GCC_AMD64 \
    || __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ \
    || defined __s390__ || defined __s390x__ \
    || defined __mips__ \
    || defined __alpha__ \
    || defined __hppa__ \
    || defined __ia64__ \
    || defined __m68k__ \
    || defined __m88k__ \
    || defined __sh__ \
    || defined _M_IX86 || defined ECB_MSVC_AMD64 || defined _M_IA64 \
    || (defined __arm__ && (defined __ARM_EABI__ || defined __EABI__ || defined __VFP_FP__ || defined _WIN32_WCE || defined __ANDROID__)) \
    || defined __aarch64__
  #define ECB_STDFP 1
  #include <string.h> /* for memcpy */
#else
  #define ECB_STDFP 0
#endif

#ifndef ECB_NO_LIBM

  #include <math.h> /* for frexp*, ldexp*, INFINITY, NAN */

  /* only the oldest of old doesn't have this one. solaris. */
  #ifdef INFINITY
    #define ECB_INFINITY INFINITY
  #else
    #define ECB_INFINITY HUGE_VAL
  #endif

  #ifdef NAN
    #define ECB_NAN NAN
  #else
    #define ECB_NAN ECB_INFINITY
  #endif

  #if ECB_C99 || _XOPEN_VERSION >= 600 || _POSIX_VERSION >= 200112L
    #define ecb_ldexpf(x,e) ldexpf ((x), (e))
    #define ecb_frexpf(x,e) frexpf ((x), (e))
  #else
    #define ecb_ldexpf(x,e) (float) ldexp ((double) (x), (e))
    #define ecb_frexpf(x,e) (float) frexp ((double) (x), (e))
  #endif

  /* convert a float to ieee single/binary32 */
  ecb_function_ ecb_const uint32_t ecb_float_to_binary32 (float x);
  ecb_function_ ecb_const uint32_t
  ecb_float_to_binary32 (float x)
  {
    uint32_t r;

    #if ECB_STDFP
      memcpy (&r, &x, 4);
    #else
      /* slow emulation, works for anything but -0 */
      uint32_t m;
      int e;

      if (x == 0e0f                    ) return 0x00000000U;
      if (x > +3.40282346638528860e+38f) return 0x7f800000U;
      if (x < -3.40282346638528860e+38f) return 0xff800000U;
      if (x != x                       ) return 0x7fbfffffU;

      m = ecb_frexpf (x, &e) * 0x1000000U;

      r = m & 0x80000000U;

      if (r)
        m = -m;

      if (e <= -126)
        {
          m &= 0xffffffU;
          m >>= (-125 - e);
          e = -126;
        }

      r |= (e + 126) << 23;
      r |= m & 0x7fffffU;
    #endif

    return r;
  }

  /* converts an ieee single/binary32 to a float */
  ecb_function_ ecb_const float ecb_binary32_to_float (uint32_t x);
  ecb_function_ ecb_const float
  ecb_binary32_to_float (uint32_t x)
  {
    float r;

    #if ECB_STDFP
      memcpy (&r, &x, 4);
    #else
      /* emulation, only works for normals and subnormals and +0 */
      int neg = x >> 31;
      int e = (x >> 23) & 0xffU;

      x &= 0x7fffffU;

      if (e)
        x |= 0x800000U;
      else
        e = 1;

      /* we distrust ldexpf a bit and do the 2**-24 scaling by an extra multiply */
      r = ecb_ldexpf (x * (0.5f / 0x800000U), e - 126);

      r = neg ? -r : r;
    #endif

    return r;
  }

  /* convert a double to ieee double/binary64 */
  ecb_function_ ecb_const uint64_t ecb_double_to_binary64 (double x);
  ecb_function_ ecb_const uint64_t
  ecb_double_to_binary64 (double x)
  {
    uint64_t r;

    #if ECB_STDFP
      memcpy (&r, &x, 8);
    #else
      /* slow emulation, works for anything but -0 */
      uint64_t m;
      int e;

      if (x == 0e0                     ) return 0x0000000000000000U;
      if (x > +1.79769313486231470e+308) return 0x7ff0000000000000U;
      if (x < -1.79769313486231470e+308) return 0xfff0000000000000U;
      if (x != x                       ) return 0X7ff7ffffffffffffU;

      m = frexp (x, &e) * 0x20000000000000U;

      r = m & 0x8000000000000000;;

      if (r)
        m = -m;

      if (e <= -1022)
        {
          m &= 0x1fffffffffffffU;
          m >>= (-1021 - e);
          e = -1022;
        }

      r |= ((uint64_t)(e + 1022)) << 52;
      r |= m & 0xfffffffffffffU;
    #endif

    return r;
  }

  /* converts an ieee double/binary64 to a double */
  ecb_function_ ecb_const double ecb_binary64_to_double (uint64_t x);
  ecb_function_ ecb_const double
  ecb_binary64_to_double (uint64_t x)
  {
    double r;

    #if ECB_STDFP
      memcpy (&r, &x, 8);
    #else
      /* emulation, only works for normals and subnormals and +0 */
      int neg = x >> 63;
      int e = (x >> 52) & 0x7ffU;

      x &= 0xfffffffffffffU;

      if (e)
        x |= 0x10000000000000U;
      else
        e = 1;

      /* we distrust ldexp a bit and do the 2**-53 scaling by an extra multiply */
      r = ldexp (x * (0.5 / 0x10000000000000U), e - 1022);

      r = neg ? -r : r;
    #endif

    return r;
  }

  /* convert a float to ieee half/binary16 */
  ecb_function_ ecb_const uint16_t ecb_float_to_binary16 (float x);
  ecb_function_ ecb_const uint16_t
  ecb_float_to_binary16 (float x)
  {
    return ecb_binary32_to_binary16 (ecb_float_to_binary32 (x));
  }

  /* convert an ieee half/binary16 to float */
  ecb_function_ ecb_const float ecb_binary16_to_float (uint16_t x);
  ecb_function_ ecb_const float
  ecb_binary16_to_float (uint16_t x)
  {
    return ecb_binary32_to_float (ecb_binary16_to_binary32 (x));
  }

#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_NO_THREADS 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 inline_size        ecb_inline

#if EV_FEATURE_CODE
# define inline_speed      ecb_inline
#else
# define inline_speed      ecb_noinline static
#endif

/*****************************************************************************/
/* raw syscall wrappers */

#if EV_NEED_SYSCALL

#include <sys/syscall.h>

/*
 * define some syscall wrappers for common architectures
 * this is mostly for nice looks during debugging, not performance.
 * our syscalls return < 0, not == -1, on error. which is good
 * enough for linux aio.
 * TODO: arm is also common nowadays, maybe even mips and x86
 * TODO: after implementing this, it suddenly looks like overkill, but its hard to remove...
 */
#if __GNUC__ && __linux && ECB_AMD64 && !defined __OPTIMIZE_SIZE__
  /* the costly errno access probably kills this for size optimisation */

  #define ev_syscall(nr,narg,arg1,arg2,arg3,arg4,arg5,arg6)            \
    ({                                                                 \
        long res;                                                      \
        register unsigned long r6 __asm__ ("r9" );                     \
        register unsigned long r5 __asm__ ("r8" );                     \
        register unsigned long r4 __asm__ ("r10");                     \
        register unsigned long r3 __asm__ ("rdx");                     \
        register unsigned long r2 __asm__ ("rsi");                     \
        register unsigned long r1 __asm__ ("rdi");                     \
        if (narg >= 6) r6 = (unsigned long)(arg6);                     \
        if (narg >= 5) r5 = (unsigned long)(arg5);                     \
        if (narg >= 4) r4 = (unsigned long)(arg4);                     \
        if (narg >= 3) r3 = (unsigned long)(arg3);                     \
        if (narg >= 2) r2 = (unsigned long)(arg2);                     \
        if (narg >= 1) r1 = (unsigned long)(arg1);                     \
        __asm__ __volatile__ (                                         \
          "syscall\n\t"                                                \
          : "=a" (res)                                                 \
          : "0" (nr), "r" (r1), "r" (r2), "r" (r3), "r" (r4), "r" (r5) \
          : "cc", "r11", "cx", "memory");                              \
        errno = -res;                                                  \
        res;                                                           \
    })

#endif

#ifdef ev_syscall
  #define ev_syscall0(nr)                               ev_syscall (nr, 0,    0,    0,    0,    0,    0,   0)
  #define ev_syscall1(nr,arg1)                          ev_syscall (nr, 1, arg1,    0,    0,    0,    0,   0)
  #define ev_syscall2(nr,arg1,arg2)                     ev_syscall (nr, 2, arg1, arg2,    0,    0,    0,   0)
  #define ev_syscall3(nr,arg1,arg2,arg3)                ev_syscall (nr, 3, arg1, arg2, arg3,    0,    0,   0)
  #define ev_syscall4(nr,arg1,arg2,arg3,arg4)           ev_syscall (nr, 3, arg1, arg2, arg3, arg4,    0,   0)
  #define ev_syscall5(nr,arg1,arg2,arg3,arg4,arg5)      ev_syscall (nr, 5, arg1, arg2, arg3, arg4, arg5,   0)
  #define ev_syscall6(nr,arg1,arg2,arg3,arg4,arg5,arg6) ev_syscall (nr, 6, arg1, arg2, arg3, arg4, arg5,arg6)
#else
  #define ev_syscall0(nr)                               syscall (nr)
  #define ev_syscall1(nr,arg1)                          syscall (nr, arg1)
  #define ev_syscall2(nr,arg1,arg2)                     syscall (nr, arg1, arg2)
  #define ev_syscall3(nr,arg1,arg2,arg3)                syscall (nr, arg1, arg2, arg3)
  #define ev_syscall4(nr,arg1,arg2,arg3,arg4)           syscall (nr, arg1, arg2, arg3, arg4)
  #define ev_syscall5(nr,arg1,arg2,arg3,arg4,arg5)      syscall (nr, arg1, arg2, arg3, arg4, arg5)
  #define ev_syscall6(nr,arg1,arg2,arg3,arg4,arg5,arg6) syscall (nr, arg1, arg2, arg3, arg4, arg5,arg6)
#endif

#endif

/*****************************************************************************/

#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)

#if EV_MINPRI == EV_MAXPRI
# define ABSPRI(w) (((W)w), 0)
#else
# define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
#endif

#define EMPTY /* required for microsofts broken pseudo-c compiler */

typedef ev_watcher *W;
typedef ev_watcher_list *WL;
typedef ev_watcher_time *WT;

#define ev_active(w) ((W)(w))->active
#define ev_at(w) ((WT)(w))->at

#if EV_USE_REALTIME
/* sig_atomic_t is used to avoid per-thread variables or locking but still */
/* giving it a reasonably high chance of working on typical architectures */
static EV_ATOMIC_T have_realtime; /* did clock_gettime (CLOCK_REALTIME) work? */
#endif

#if EV_USE_MONOTONIC
static EV_ATOMIC_T have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
#endif

#ifndef EV_FD_TO_WIN32_HANDLE
# define EV_FD_TO_WIN32_HANDLE(fd) _get_osfhandle (fd)
#endif
#ifndef EV_WIN32_HANDLE_TO_FD
# define EV_WIN32_HANDLE_TO_FD(handle) _open_osfhandle (handle, 0)
#endif
#ifndef EV_WIN32_CLOSE_FD
# define EV_WIN32_CLOSE_FD(fd) close (fd)
#endif

#ifdef _WIN32
# include "ev_win32.c"
#endif

/*****************************************************************************/

#if EV_USE_LINUXAIO
# include <linux/aio_abi.h> /* probably only needed for aio_context_t */
#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 */
ecb_noinline
static ev_tstamp
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

  /* special treatment for negative arguments */
  if (ecb_expect_false (v < 0.))
    {
      ev_tstamp f = -ev_floor (-v);

      return f - (f == v ? 0 : 1);
    }

  /* argument too large for an unsigned long? then reduce it */
  if (ecb_expect_false (v >= shift))
    {
      ev_tstamp f;

      if (v == v - 1.)
        return v; /* very large numbers are assumed to be integer */

      f = shift * ev_floor (v * (1. / shift));
      return f + ev_floor (v - f);
    }

  /* fits into an unsigned long */
  return (unsigned long)v;
}

#endif

/*****************************************************************************/

#ifdef __linux
# include <sys/utsname.h>
#endif

ecb_noinline ecb_cold
static unsigned int
ev_linux_version (void)
{
#ifdef __linux
  unsigned int v = 0;
  struct utsname buf;
  int i;
  char *p = buf.release;

  if (uname (&buf))
    return 0;

  for (i = 3+1; --i; )
    {
      unsigned int c = 0;

      for (;;)
        {
          if (*p >= '0' && *p <= '9')
            c = c * 10 + *p++ - '0';
          else
            {
              p += *p == '.';
              break;
            }
        }

      v = (v << 8) | c;
    }

  return v;
#else
  return 0;
#endif
}

/*****************************************************************************/

#if EV_AVOID_STDIO
ecb_noinline ecb_cold
static void
ev_printerr (const char *msg)
{
  write (STDERR_FILENO, msg, strlen (msg));
}
#endif

static void (*syserr_cb)(const char *msg) EV_NOEXCEPT;

ecb_cold
void
ev_set_syserr_cb (void (*cb)(const char *msg) EV_NOEXCEPT) EV_NOEXCEPT
{
  syserr_cb = cb;
}

ecb_noinline ecb_cold
static void
ev_syserr (const char *msg)
{
  if (!msg)
    msg = "(libev) system error";

  if (syserr_cb)
    syserr_cb (msg);
  else
    {
#if EV_AVOID_STDIO
      ev_printerr (msg);
      ev_printerr (": ");
      ev_printerr (strerror (errno));
      ev_printerr ("\n");
#else
      perror (msg);
#endif
      abort ();
    }
}

static void *
ev_realloc_emul (void *ptr, long size) EV_NOEXCEPT
{
  /* 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;
}

static void *(*alloc)(void *ptr, long size) EV_NOEXCEPT = ev_realloc_emul;

ecb_cold
void
ev_set_allocator (void *(*cb)(void *ptr, long size) EV_NOEXCEPT) EV_NOEXCEPT
{
  alloc = cb;
}

inline_speed void *
ev_realloc (void *ptr, long size)
{
  ptr = alloc (ptr, size);

  if (!ptr && size)
    {
#if EV_AVOID_STDIO
      ev_printerr ("(libev) memory allocation failed, aborting.\n");
#else
      fprintf (stderr, "(libev) cannot allocate %ld bytes, aborting.", size);
#endif
      abort ();
    }

  return ptr;
}

#define ev_malloc(size) ev_realloc (0, (size))
#define ev_free(ptr)    ev_realloc ((ptr), 0)

/*****************************************************************************/

/* set in reify when reification needed */
#define EV_ANFD_REIFY 1

/* file descriptor info structure */
typedef struct
{
  WL head;
  unsigned char events; /* the events watched for */
  unsigned char reify;  /* flag set when this ANFD needs reification (EV_ANFD_REIFY, EV__IOFDSET) */
  unsigned char emask;  /* some backends store the actual kernel mask in here */
  unsigned char eflags; /* flags field for use by backends */
#if EV_USE_EPOLL
  unsigned int egen;    /* generation counter to counter epoll bugs */
#endif
#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
{
  W w;
  int events; /* the pending event set for the given watcher */
} ANPENDING;

#if EV_USE_INOTIFY
/* hash table entry per inotify-id */
typedef struct
{
  WL head;
} ANFS;
#endif

/* Heap Entry */
#if EV_HEAP_CACHE_AT
  /* a heap element */
  typedef struct {
    ev_tstamp at;
    WT w;
  } ANHE;

  #define ANHE_w(he)        (he).w     /* access watcher, read-write */
  #define ANHE_at(he)       (he).at    /* access cached at, read-only */
  #define ANHE_at_cache(he) (he).at = (he).w->at /* update at from watcher */
#else
  /* a heap element */
  typedef WT ANHE;

  #define ANHE_w(he)        (he)
  #define ANHE_at(he)       (he)->at
  #define ANHE_at_cache(he)
#endif

#if EV_MULTIPLICITY

  struct ev_loop
  {
    ev_tstamp ev_rt_now;
    #define ev_rt_now ((loop)->ev_rt_now)
    #define VAR(name,decl) decl;
      #include "ev_vars.h"
    #undef VAR
  };
  #include "ev_wrap.h"

  static struct ev_loop default_loop_struct;
  EV_API_DECL struct ev_loop *ev_default_loop_ptr = 0; /* needs to be initialised to make it a definition despite extern */

#else

  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;

#endif

#if EV_FEATURE_API
# define EV_RELEASE_CB if (ecb_expect_false (release_cb)) release_cb (EV_A)
# define EV_ACQUIRE_CB if (ecb_expect_false (acquire_cb)) acquire_cb (EV_A)
# define EV_INVOKE_PENDING invoke_cb (EV_A)
#else
# define EV_RELEASE_CB (void)0
# define EV_ACQUIRE_CB (void)0
# define EV_INVOKE_PENDING ev_invoke_pending (EV_A)
#endif

#define EVBREAK_RECURSE 0x80

/*****************************************************************************/

#ifndef EV_HAVE_EV_TIME
ev_tstamp
ev_time (void) EV_NOEXCEPT
{
#if EV_USE_REALTIME
  if (ecb_expect_true (have_realtime))
    {
      struct timespec ts;
      clock_gettime (CLOCK_REALTIME, &ts);
      return ts.tv_sec + ts.tv_nsec * 1e-9;
    }
#endif

  struct timeval tv;
  gettimeofday (&tv, 0);
  return tv.tv_sec + tv.tv_usec * 1e-6;
}
#endif

inline_size ev_tstamp
get_clock (void)
{
#if EV_USE_MONOTONIC
  if (ecb_expect_true (have_monotonic))
    {
      struct timespec ts;
      clock_gettime (CLOCK_MONOTONIC, &ts);
      return ts.tv_sec + ts.tv_nsec * 1e-9;
    }
#endif

  return ev_time ();
}

#if EV_MULTIPLICITY
ev_tstamp
ev_now (EV_P) EV_NOEXCEPT
{
  return ev_rt_now;
}
#endif

void
ev_sleep (ev_tstamp delay) EV_NOEXCEPT
{
  if (delay > 0.)
    {
#if EV_USE_NANOSLEEP
      struct timespec ts;

      EV_TS_SET (ts, delay);
      nanosleep (&ts, 0);
#elif defined _WIN32
      /* maybe this should round up, as ms is very low resolution */
      /* compared to select (µs) or nanosleep (ns) */
      Sleep ((unsigned long)(delay * 1e3));
#else
      struct timeval tv;

      /* here we rely on sys/time.h + sys/types.h + unistd.h providing select */
      /* something not guaranteed by newer posix versions, but guaranteed */
      /* by older ones */
      EV_TV_SET (tv, delay);
      select (0, 0, 0, 0, &tv);
#endif
    }
}

/*****************************************************************************/

#define MALLOC_ROUND 4096 /* prefer to allocate in chunks of this size, must be 2**n and >> 4 longs */

/* find a suitable new size for the given array, */
/* hopefully by rounding to a nice-to-malloc size */
inline_size int
array_nextsize (int elem, int cur, int cnt)
{
  int ncur = cur + 1;

  do
    ncur <<= 1;
  while (cnt > ncur);

  /* 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;
      ncur /= elem;
    }

  return ncur;
}

ecb_noinline ecb_cold
static void *
array_realloc (int elem, void *base, int *cur, int cnt)
{
  *cur = array_nextsize (elem, *cur, cnt);
  return ev_realloc (base, elem * *cur);
}

#define array_needsize_noinit(base,offset,count)

#define array_needsize_zerofill(base,offset,count)      \
  memset ((void *)(base + offset), 0, sizeof (*(base)) * (count))

#define array_needsize(type,base,cur,cnt,init)                  \
  if (ecb_expect_false ((cnt) > (cur)))                         \
    {                                                           \
      ecb_unused int ocur_ = (cur);                             \
      (base) = (type *)array_realloc                            \
         (sizeof (type), (base), &(cur), (cnt));                \
      init ((base), ocur_, ((cur) - ocur_));                    \
    }

#if 0
#define array_slim(type,stem)                                   \
  if (stem ## max < array_roundsize (stem ## cnt >> 2))         \
    {                                                           \
      stem ## max = array_roundsize (stem ## cnt >> 1);         \
      base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
      fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
    }
#endif

#define array_free(stem, idx) \
  ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0; stem ## s idx = 0

/*****************************************************************************/

/* dummy callback for pending events */
ecb_noinline
static void
pendingcb (EV_P_ ev_prepare *w, int revents)
{
}

ecb_noinline
void
ev_feed_event (EV_P_ void *w, int revents) EV_NOEXCEPT
{
  W w_ = (W)w;
  int pri = ABSPRI (w_);

  if (ecb_expect_false (w_->pending))
    pendings [pri][w_->pending - 1].events |= revents;
  else
    {
      w_->pending = ++pendingcnt [pri];
      array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, array_needsize_noinit);
      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)
{
  array_needsize (W, rfeeds, rfeedmax, rfeedcnt + 1, array_needsize_noinit);
  rfeeds [rfeedcnt++] = w;
}

inline_size void
feed_reverse_done (EV_P_ int revents)
{
  do
    ev_feed_event (EV_A_ rfeeds [--rfeedcnt], revents);
  while (rfeedcnt);
}

inline_speed void
queue_events (EV_P_ W *events, int eventcnt, int type)
{
  int i;

  for (i = 0; i < eventcnt; ++i)
    ev_feed_event (EV_A_ events [i], type);
}

/*****************************************************************************/

inline_speed void
fd_event_nocheck (EV_P_ int fd, int revents)
{
  ANFD *anfd = anfds + fd;
  ev_io *w;

  for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
    {
      int ev = w->events & revents;

      if (ev)
        ev_feed_event (EV_A_ (W)w, ev);
    }
}

/* do not submit kernel events for fds that have reify set */
/* because that means they changed while we were polling for new events */
inline_speed void
fd_event (EV_P_ int fd, int revents)
{
  ANFD *anfd = anfds + fd;

  if (ecb_expect_true (!anfd->reify))
    fd_event_nocheck (EV_A_ fd, revents);
}

void
ev_feed_fd_event (EV_P_ int fd, int revents) EV_NOEXCEPT
{
  if (fd >= 0 && fd < anfdmax)
    fd_event_nocheck (EV_A_ fd, revents);
}

/* make sure the external fd watch events are in-sync */
/* with the kernel/libev internal state */
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 (ecb_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)
            anfd->events |= (unsigned char)w->events;

          if (o_events != anfd->events)
            o_reify = EV__IOFDSET; /* actually |= */
        }

      if (o_reify & EV__IOFDSET)
        backend_modify (EV_A_ fd, o_events, anfd->events);
    }

  fdchangecnt = 0;
}

/* something about the given fd changed */
inline_size
void
fd_change (EV_P_ int fd, int flags)
{
  unsigned char reify = anfds [fd].reify;
  anfds [fd].reify |= flags;

  if (ecb_expect_true (!reify))
    {
      ++fdchangecnt;
      array_needsize (int, fdchanges, fdchangemax, fdchangecnt, array_needsize_noinit);
      fdchanges [fdchangecnt - 1] = fd;
    }
}

/* the given fd is invalid/unusable, so make sure it doesn't hurt us anymore */
inline_speed ecb_cold void
fd_kill (EV_P_ int fd)
{
  ev_io *w;

  while ((w = (ev_io *)anfds [fd].head))
    {
      ev_io_stop (EV_A_ w);
      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 ecb_cold int
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 */
ecb_noinline ecb_cold
static void
fd_ebadf (EV_P)
{
  int fd;

  for (fd = 0; fd < anfdmax; ++fd)
    if (anfds [fd].events)
      if (!fd_valid (fd) && errno == EBADF)
        fd_kill (EV_A_ fd);
}

/* called on ENOMEM in select/poll to kill some fds and retry */
ecb_noinline ecb_cold
static void
fd_enomem (EV_P)
{
  int fd;

  for (fd = anfdmax; fd--; )
    if (anfds [fd].events)
      {
        fd_kill (EV_A_ fd);
        break;
      }
}

/* usually called after fork if backend needs to re-arm all fds from scratch */
ecb_noinline
static void
fd_rearm_all (EV_P)
{
  int fd;

  for (fd = 0; fd < anfdmax; ++fd)
    if (anfds [fd].events)
      {
        anfds [fd].events = 0;
        anfds [fd].emask  = 0;
        fd_change (EV_A_ fd, EV__IOFDSET | EV_ANFD_REIFY);
      }
}

/* used to prepare libev internal fd's */
/* this is not fork-safe */
inline_speed void
fd_intern (int fd)
{
#ifdef _WIN32
  unsigned long arg = 1;
  ioctlsocket (EV_FD_TO_WIN32_HANDLE (fd), FIONBIO, &arg);
#else
  fcntl (fd, F_SETFD, FD_CLOEXEC);
  fcntl (fd, F_SETFL, O_NONBLOCK);
#endif
}

/*****************************************************************************/

/*
 * the heap functions want a real array index. array index 0 is guaranteed to not
 * be in-use at any time. the first heap entry is at array [HEAP0]. DHEAP gives
 * the branching factor of the d-tree.
 */

/*
 * at the moment we allow libev the luxury of two heaps,
 * a small-code-size 2-heap one and a ~1.5kb larger 4-heap
 * which is more cache-efficient.
 * the difference is about 5% with 50000+ watchers.
 */
#if EV_USE_4HEAP

#define DHEAP 4
#define HEAP0 (DHEAP - 1) /* index of first element in heap */
#define HPARENT(k) ((((k) - HEAP0 - 1) / DHEAP) + HEAP0)
#define UPHEAP_DONE(p,k) ((p) == (k))

/* away from the root */
inline_speed void
downheap (ANHE *heap, int N, int k)
{
  ANHE he = heap [k];
  ANHE *E = heap + N + HEAP0;

  for (;;)
    {
      ev_tstamp minat;
      ANHE *minpos;
      ANHE *pos = heap + DHEAP * (k - HEAP0) + HEAP0 + 1;

      /* find minimum child */
      if (ecb_expect_true (pos + DHEAP - 1 < E))
        {
          /* fast path */                               (minpos = pos + 0), (minat = ANHE_at (*minpos));
          if (               ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
          if (               ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
          if (               ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
        }
      else if (pos < E)
        {
          /* slow path */                               (minpos = pos + 0), (minat = ANHE_at (*minpos));
          if (pos + 1 < E && ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
          if (pos + 2 < E && ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
          if (pos + 3 < E && ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
        }
      else
        break;

      if (ANHE_at (he) <= minat)
        break;

      heap [k] = *minpos;
      ev_active (ANHE_w (*minpos)) = k;

      k = minpos - heap;
    }

  heap [k] = he;
  ev_active (ANHE_w (he)) = k;
}

#else /* 4HEAP */

#define HEAP0 1
#define HPARENT(k) ((k) >> 1)
#define UPHEAP_DONE(p,k) (!(p))

/* away from the root */
inline_speed void
downheap (ANHE *heap, int N, int k)
{
  ANHE he = heap [k];

  for (;;)
    {
      int c = k << 1;

      if (c >= N + HEAP0)
        break;

      c += c + 1 < N + HEAP0 && ANHE_at (heap [c]) > ANHE_at (heap [c + 1])
           ? 1 : 0;

      if (ANHE_at (he) <= ANHE_at (heap [c]))
        break;

      heap [k] = heap [c];
      ev_active (ANHE_w (heap [k])) = k;
      
      k = c;
    }

  heap [k] = he;
  ev_active (ANHE_w (he)) = k;
}
#endif

/* towards the root */
inline_speed void
upheap (ANHE *heap, int k)
{
  ANHE he = heap [k];

  for (;;)
    {
      int p = HPARENT (k);

      if (UPHEAP_DONE (p, k) || ANHE_at (heap [p]) <= ANHE_at (he))
        break;

      heap [k] = heap [p];
      ev_active (ANHE_w (heap [k])) = k;
      k = p;
    }

  heap [k] = he;
  ev_active (ANHE_w (he)) = k;
}

/* move an element suitably so it is in a correct place */
inline_size void
adjustheap (ANHE *heap, int N, int k)
{
  if (k > HEAP0 && ANHE_at (heap [k]) <= ANHE_at (heap [HPARENT (k)]))
    upheap (heap, k);
  else
    downheap (heap, N, k);
}

/* rebuild the heap: this function is used only once and executed rarely */
inline_size void
reheap (ANHE *heap, int N)
{
  int i;

  /* we don't use floyds algorithm, upheap is simpler and is more cache-efficient */
  /* also, this is easy to implement and correct for both 2-heaps and 4-heaps */
  for (i = 0; i < N; ++i)
    upheap (heap, i + HEAP0);
}

/*****************************************************************************/

/* associate signal watchers to a signal signal */
typedef struct
{
  EV_ATOMIC_T pending;
#if EV_MULTIPLICITY
  EV_P;
#endif
  WL head;
} ANSIG;

static ANSIG signals [EV_NSIG - 1];

/*****************************************************************************/

#if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE

ecb_noinline ecb_cold
static void
evpipe_init (EV_P)
{
  if (!ev_is_active (&pipe_w))
    {
      int fds [2];

# if EV_USE_EVENTFD
      fds [0] = -1;
      fds [1] = eventfd (0, EFD_NONBLOCK | EFD_CLOEXEC);
      if (fds [1] < 0 && errno == EINVAL)
        fds [1] = eventfd (0, 0);

      if (fds [1] < 0)
# endif
        {
          while (pipe (fds))
            ev_syserr ("(libev) error creating signal/async pipe");

          fd_intern (fds [0]);
        }

      evpipe [0] = fds [0];

      if (evpipe [1] < 0)
        evpipe [1] = fds [1]; /* first call, set write fd */
      else
        {
          /* on subsequent calls, do not change evpipe [1] */
          /* so that evpipe_write can always rely on its value. */
          /* this branch does not do anything sensible on windows, */
          /* so must not be executed on windows */

          dup2 (fds [1], evpipe [1]);
          close (fds [1]);
        }

      fd_intern (evpipe [1]);

      ev_io_set (&pipe_w, evpipe [0] < 0 ? evpipe [1] : evpipe [0], EV_READ);
      ev_io_start (EV_A_ &pipe_w);
      ev_unref (EV_A); /* watcher should not keep loop alive */
    }
}

inline_speed void
evpipe_write (EV_P_ EV_ATOMIC_T *flag)
{
  ECB_MEMORY_FENCE; /* push out the write before this function was called, acquire flag */

  if (ecb_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;

      old_errno = errno; /* save errno because write will clobber it */

#if EV_USE_EVENTFD
      if (evpipe [0] < 0)
        {
          uint64_t counter = 1;
          write (evpipe [1], &counter, sizeof (uint64_t));
        }
      else
#endif
        {
#ifdef _WIN32
          WSABUF buf;
          DWORD sent;
          buf.buf = (char *)&buf;
          buf.len = 1;
          WSASend (EV_FD_TO_WIN32_HANDLE (evpipe [1]), &buf, 1, &sent, 0, 0, 0);
#else
          write (evpipe [1], &(evpipe [1]), 1);
#endif
        }

      errno = old_errno;
    }
}

/* called whenever the libev signal pipe */
/* got some events (signal, async) */
static void
pipecb (EV_P_ ev_io *iow, int revents)
{
  int i;

  if (revents & EV_READ)
    {
#if EV_USE_EVENTFD
      if (evpipe [0] < 0)
        {
          uint64_t counter;
          read (evpipe [1], &counter, sizeof (uint64_t));
        }
      else
#endif
        {
          char dummy[4];
#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, 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 (ecb_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_NOEXCEPT
{
#if EV_MULTIPLICITY
  EV_P;
  ECB_MEMORY_FENCE_ACQUIRE;
  EV_A = signals [signum - 1].loop;

  if (!EV_A)
    return;
#endif

  signals [signum - 1].pending = 1;
  evpipe_write (EV_A_ &sig_pending);
}

static void
ev_sighandler (int signum)
{
#ifdef _WIN32
  signal (signum, ev_sighandler);
#endif

  ev_feed_signal (signum);
}

ecb_noinline
void
ev_feed_signal_event (EV_P_ int signum) EV_NOEXCEPT
{
  WL w;

  if (ecb_expect_false (signum <= 0 || signum >= EV_NSIG))
    return;

  --signum;

#if EV_MULTIPLICITY
  /* it is permissible to try to feed a signal to the wrong loop */
  /* or, likely more useful, feeding a signal nobody is waiting for */

  if (ecb_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);
}

#if EV_USE_SIGNALFD
static void
sigfdcb (EV_P_ ev_io *iow, int revents)
{
  struct signalfd_siginfo si[2], *sip; /* these structs are big */

  for (;;)
    {
      ssize_t res = read (sigfd, si, sizeof (si));

      /* not ISO-C, as res might be -1, but works with SuS */
      for (sip = si; (char *)sip < (char *)si + res; ++sip)
        ev_feed_signal_event (EV_A_ sip->ssi_signo);

      if (res < (ssize_t)sizeof (si))
        break;
    }
}
#endif

#endif

/*****************************************************************************/

#if EV_CHILD_ENABLE
static WL childs [EV_PID_HASHSIZE];

static ev_signal childev;

#ifndef WIFCONTINUED
# define WIFCONTINUED(status) 0
#endif

/* handle a single child status event */
inline_speed void
child_reap (EV_P_ int chain, int pid, int status)
{
  ev_child *w;
  int traced = WIFSTOPPED (status) || WIFCONTINUED (status);

  for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next)
    {
      if ((w->pid == pid || !w->pid)
          && (!traced || (w->flags & 1)))
        {
          ev_set_priority (w, EV_MAXPRI); /* need to do it *now*, this *must* be the same prio as the signal watcher itself */
          w->rpid    = pid;
          w->rstatus = status;
          ev_feed_event (EV_A_ (W)w, EV_CHILD);
        }
    }
}

#ifndef WCONTINUED
# define WCONTINUED 0
#endif

/* called on sigchld etc., calls waitpid */
static void
childcb (EV_P_ ev_signal *sw, int revents)
{
  int pid, status;

  /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
  if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
    if (!WCONTINUED
        || errno != EINVAL
        || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
      return;

  /* make sure we are called again until all children have been reaped */
  /* we need to do it this way so that the callback gets called before we continue */
  ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);

  child_reap (EV_A_ pid, pid, status);
  if ((EV_PID_HASHSIZE) > 1)
    child_reap (EV_A_ 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
}

#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_EPOLL
# include "ev_epoll.c"
#endif
#if EV_USE_LINUXAIO
# include "ev_linuxaio.c"
#endif
#if EV_USE_IOURING
# include "ev_iouring.c"
#endif
#if EV_USE_POLL
# include "ev_poll.c"
#endif
#if EV_USE_SELECT
# include "ev_select.c"
#endif

ecb_cold int
ev_version_major (void) EV_NOEXCEPT
{
  return EV_VERSION_MAJOR;
}

ecb_cold int
ev_version_minor (void) EV_NOEXCEPT
{
  return EV_VERSION_MINOR;
}

/* return true if we are running with elevated privileges and should ignore env variables */
inline_size ecb_cold int
enable_secure (void)
{
#ifdef _WIN32
  return 0;
#else
  return getuid () != geteuid ()
      || getgid () != getegid ();
#endif
}

ecb_cold
unsigned int
ev_supported_backends (void) EV_NOEXCEPT
{
  unsigned int flags = 0;

  if (EV_USE_PORT    ) flags |= EVBACKEND_PORT;
  if (EV_USE_KQUEUE  ) flags |= EVBACKEND_KQUEUE;
  if (EV_USE_EPOLL   ) flags |= EVBACKEND_EPOLL;
  if (EV_USE_LINUXAIO) flags |= EVBACKEND_LINUXAIO;
  if (EV_USE_IOURING ) flags |= EVBACKEND_IOURING;
  if (EV_USE_POLL    ) flags |= EVBACKEND_POLL;
  if (EV_USE_SELECT  ) flags |= EVBACKEND_SELECT;
  
  return flags;
}

ecb_cold
unsigned int
ev_recommended_backends (void) EV_NOEXCEPT
{
  unsigned int flags = ev_supported_backends ();

#ifndef __NetBSD__
  /* kqueue is borked on everything but netbsd apparently */
  /* it usually doesn't work correctly on anything but sockets and pipes */
  flags &= ~EVBACKEND_KQUEUE;
#endif
#ifdef __APPLE__
  /* only select works correctly on that "unix-certified" platform */
  flags &= ~EVBACKEND_KQUEUE; /* horribly broken, even for sockets */
  flags &= ~EVBACKEND_POLL;   /* poll is based on kqueue from 10.5 onwards */
#endif
#ifdef __FreeBSD__
  flags &= ~EVBACKEND_POLL;   /* poll return value is unusable (http://forums.freebsd.org/archive/index.php/t-10270.html) */
#endif

  /* TODO: linuxaio is very experimental */
#if !EV_RECOMMEND_LINUXAIO
  flags &= ~EVBACKEND_LINUXAIO;
#endif
  /* TODO: linuxaio is super experimental */
#if !EV_RECOMMEND_IOURING
  flags &= ~EVBACKEND_IOURING;
#endif

  return flags;
}

ecb_cold
unsigned int
ev_embeddable_backends (void) EV_NOEXCEPT
{
  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 */
    flags &= ~EVBACKEND_EPOLL;

  /* EVBACKEND_LINUXAIO is theoretically embeddable, but suffers from a performance overhead */

  /* EVBACKEND_IOURING is practically embeddable, but the current implementation is not
   * because our backend_fd is the epoll fd we need as fallback.
   * if the kernel ever is fixed, this might change...
   */

  return flags;
}

unsigned int
ev_backend (EV_P) EV_NOEXCEPT
{
  return backend;
}

#if EV_FEATURE_API
unsigned int
ev_iteration (EV_P) EV_NOEXCEPT
{
  return loop_count;
}

unsigned int
ev_depth (EV_P) EV_NOEXCEPT
{
  return loop_depth;
}

void
ev_set_io_collect_interval (EV_P_ ev_tstamp interval) EV_NOEXCEPT
{
  io_blocktime = interval;
}

void
ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval) EV_NOEXCEPT
{
  timeout_blocktime = interval;
}

void
ev_set_userdata (EV_P_ void *data) EV_NOEXCEPT
{
  userdata = data;
}

void *
ev_userdata (EV_P) EV_NOEXCEPT
{
  return userdata;
}

void
ev_set_invoke_pending_cb (EV_P_ ev_loop_callback invoke_pending_cb) EV_NOEXCEPT
{
  invoke_cb = invoke_pending_cb;
}

void
ev_set_loop_release_cb (EV_P_ void (*release)(EV_P) EV_NOEXCEPT, void (*acquire)(EV_P) EV_NOEXCEPT) EV_NOEXCEPT
{
  release_cb = release;
  acquire_cb = acquire;
}
#endif

/* initialise a loop structure, must be zero-initialised */
ecb_noinline ecb_cold
static void
loop_init (EV_P_ unsigned int flags) EV_NOEXCEPT
{
  if (!backend)
    {
      origflags = flags;

#if EV_USE_REALTIME
      if (!have_realtime)
        {
          struct timespec ts;

          if (!clock_gettime (CLOCK_REALTIME, &ts))
            have_realtime = 1;
        }
#endif

#if EV_USE_MONOTONIC
      if (!have_monotonic)
        {
          struct timespec ts;

          if (!clock_gettime (CLOCK_MONOTONIC, &ts))
            have_monotonic = 1;
        }
#endif

      /* pid check not overridable via env */
#ifndef _WIN32
      if (flags & EVFLAG_FORKCHECK)
        curpid = getpid ();
#endif

      if (!(flags & EVFLAG_NOENV)
          && !enable_secure ()
          && getenv ("LIBEV_FLAGS"))
        flags = atoi (getenv ("LIBEV_FLAGS"));

      ev_rt_now          = ev_time ();
      mn_now             = get_clock ();
      now_floor          = mn_now;
      rtmn_diff          = ev_rt_now - mn_now;
#if EV_FEATURE_API
      invoke_cb          = ev_invoke_pending;
#endif

      io_blocktime       = 0.;
      timeout_blocktime  = 0.;
      backend            = 0;
      backend_fd         = -1;
      sig_pending        = 0;
#if EV_ASYNC_ENABLE
      async_pending      = 0;
#endif
      pipe_write_skipped = 0;
      pipe_write_wanted  = 0;
      evpipe [0]         = -1;
      evpipe [1]         = -1;
#if EV_USE_INOTIFY
      fs_fd              = flags & EVFLAG_NOINOTIFY ? -1 : -2;
#endif
#if EV_USE_SIGNALFD
      sigfd              = flags & EVFLAG_SIGNALFD  ? -2 : -1;
#endif

      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
#if EV_USE_IOURING
      if (!backend && (flags & EVBACKEND_IOURING )) backend = iouring_init   (EV_A_ flags);
#endif
#if EV_USE_LINUXAIO
      if (!backend && (flags & EVBACKEND_LINUXAIO)) backend = linuxaio_init  (EV_A_ flags);
#endif
#if EV_USE_EPOLL
      if (!backend && (flags & EVBACKEND_EPOLL   )) backend = epoll_init     (EV_A_ flags);
#endif
#if EV_USE_POLL
      if (!backend && (flags & EVBACKEND_POLL    )) backend = poll_init      (EV_A_ flags);
#endif
#if EV_USE_SELECT
      if (!backend && (flags & EVBACKEND_SELECT  )) backend = select_init    (EV_A_ flags);
#endif

      ev_prepare_init (&pending_w, pendingcb);

#if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
      ev_init (&pipe_w, pipecb);
      ev_set_priority (&pipe_w, EV_MAXPRI);
#endif
    }
}

/* free up a loop structure */
ecb_cold
void
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 (ecb_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);*/

      if (evpipe [0] >= 0) EV_WIN32_CLOSE_FD (evpipe [0]);
      if (evpipe [1] >= 0) EV_WIN32_CLOSE_FD (evpipe [1]);
    }

#if EV_USE_SIGNALFD
  if (ev_is_active (&sigfd_w))
    close (sigfd);
#endif

#if EV_USE_INOTIFY
  if (fs_fd >= 0)
    close (fs_fd);
#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);
#endif
#if EV_USE_IOURING
  if (backend == EVBACKEND_IOURING ) iouring_destroy  (EV_A);
#endif
#if EV_USE_LINUXAIO
  if (backend == EVBACKEND_LINUXAIO) linuxaio_destroy (EV_A);
#endif
#if EV_USE_EPOLL
  if (backend == EVBACKEND_EPOLL   ) epoll_destroy    (EV_A);
#endif
#if EV_USE_POLL
  if (backend == EVBACKEND_POLL    ) poll_destroy     (EV_A);
#endif
#if EV_USE_SELECT
  if (backend == EVBACKEND_SELECT  ) select_destroy   (EV_A);
#endif

  for (i = NUMPRI; i--; )
    {
      array_free (pending, [i]);
#if EV_IDLE_ENABLE
      array_free (idle, [i]);
#endif
    }

  ev_free (anfds); anfds = 0; anfdmax = 0;

  /* have to use the microsoft-never-gets-it-right macro */
  array_free (rfeed, EMPTY);
  array_free (fdchange, EMPTY);
  array_free (timer, EMPTY);
#if EV_PERIODIC_ENABLE
  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

inline_size void
loop_fork (EV_P)
{
#if EV_USE_PORT
  if (backend == EVBACKEND_PORT    ) port_fork     (EV_A);
#endif
#if EV_USE_KQUEUE
  if (backend == EVBACKEND_KQUEUE  ) kqueue_fork   (EV_A);
#endif
#if EV_USE_IOURING
  if (backend == EVBACKEND_IOURING ) iouring_fork  (EV_A);
#endif
#if EV_USE_LINUXAIO
  if (backend == EVBACKEND_LINUXAIO) linuxaio_fork (EV_A);
#endif
#if EV_USE_EPOLL
  if (backend == EVBACKEND_EPOLL   ) epoll_fork    (EV_A);
#endif
#if EV_USE_INOTIFY
  infy_fork (EV_A);
#endif

#if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
  if (ev_is_active (&pipe_w) && postfork != 2)
    {
      /* pipe_write_wanted must be false now, so modifying fd vars should be safe */

      ev_ref (EV_A);
      ev_io_stop (EV_A_ &pipe_w);

      if (evpipe [0] >= 0)
        EV_WIN32_CLOSE_FD (evpipe [0]);

      evpipe_init (EV_A);
      /* iterate over everything, in case we missed something before */
      ev_feed_event (EV_A_ &pipe_w, EV_CUSTOM);
    }
#endif

  postfork = 0;
}

Revision:	1.504
Committed:	Sun Jul 7 06:00:32 2019 UTC (5 years, 2 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.503:	+10 -10 lines
Log Message:	* empty log message *