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libev/ev.c

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/*
* libev event processing core, watcher management
*
* Copyright (c) 2007,2008,2009,2010,2011,2012,2013 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_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
#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
/* 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.
*/
#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
/* 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_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
# 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_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) */
#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 0x00010005
#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)
#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)
#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
#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 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__ ("")
#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)
#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)
#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_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 */
/* Update, gcc-4.8 generates mfence for all c++ fences, but nothing */
/* for all __atomic_thread_fence's except seq_cst */
#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 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_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 ecb_inline
#if EV_FEATURE_CODE
# define inline_speed ecb_inline
#else
# define inline_speed noinline static
#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 */
#define EMPTY2(a,b) /* used to suppress some warnings */
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
/*****************************************************************************/
/* 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 */
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
/* 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
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
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_THROW;
ecb_cold
void
ev_set_syserr_cb (void (*cb)(const char *msg) EV_THROW) EV_THROW
{
syserr_cb = cb;
}
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_THROW
{
/* 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_THROW = ev_realloc_emul;
ecb_cold
void
ev_set_allocator (void *(*cb)(void *ptr, long size) EV_THROW) EV_THROW
{
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; /* 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 || 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 (expect_false (release_cb)) release_cb (EV_A)
# define EV_ACQUIRE_CB if (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_THROW
{
#if EV_USE_REALTIME
if (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 (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_THROW
{
return ev_rt_now;
}
#endif
void
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
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;
}
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_init_zero(base,count) \
memset ((void *)(base), 0, sizeof (*(base)) * (count))
#define array_needsize(type,base,cur,cnt,init) \
if (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 */
noinline
static void
pendingcb (EV_P_ ev_prepare *w, int revents)
{
}
noinline
void
ev_feed_event (EV_P_ void *w, int revents) EV_THROW
{
W w_ = (W)w;
int pri = ABSPRI (w_);
if (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, 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)
{
array_needsize (W, rfeeds, rfeedmax, rfeedcnt + 1, EMPTY2);
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 (expect_true (!anfd->reify))
fd_event_nocheck (EV_A_ fd, revents);
}
void
ev_feed_fd_event (EV_P_ int fd, int revents) EV_THROW
{
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 (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 (expect_true (!reify))
{
++fdchangecnt;
array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
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 */
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 */
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 */
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 (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
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 (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 = &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 (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;
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);
}
noinline
void
ev_feed_signal_event (EV_P_ int signum) EV_THROW
{
WL w;
if (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 (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_POLL
# include "ev_poll.c"
#endif
#if EV_USE_SELECT
# include "ev_select.c"
#endif
ecb_cold int
ev_version_major (void) EV_THROW
{
return EV_VERSION_MAJOR;
}
ecb_cold int
ev_version_minor (void) EV_THROW
{
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_THROW
{
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_POLL ) flags |= EVBACKEND_POLL;
if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
return flags;
}
ecb_cold
unsigned int
ev_recommended_backends (void) EV_THROW
{
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
return flags;
}
ecb_cold
unsigned int
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 */
flags &= ~EVBACKEND_EPOLL;
return flags;
}
unsigned int
ev_backend (EV_P) EV_THROW
{
return backend;
}
#if EV_FEATURE_API
unsigned int
ev_iteration (EV_P) EV_THROW
{
return loop_count;
}
unsigned int
ev_depth (EV_P) EV_THROW
{
return loop_depth;
}
void
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_THROW
{
timeout_blocktime = interval;
}
void
ev_set_userdata (EV_P_ void *data) EV_THROW
{
userdata = data;
}
void *
ev_userdata (EV_P) EV_THROW
{
return userdata;
}
void
ev_set_invoke_pending_cb (EV_P_ ev_loop_callback invoke_pending_cb) EV_THROW
{
invoke_cb = invoke_pending_cb;
}
void
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 */
noinline ecb_cold
static void
loop_init (EV_P_ unsigned int flags) EV_THROW
{
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_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 (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_