事件库libev3.7

/* * libev event processing core, watcher management * * Copyright (c) 2007,2008,2009 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. */ #ifdef __cplusplus extern "C" { #endif /* 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_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 # ifndef EV_USE_NANOSLEEP # if HAVE_NANOSLEEP # define EV_USE_NANOSLEEP 1 # else # define EV_USE_NANOSLEEP 0 # endif # endif # ifndef EV_USE_SELECT # if HAVE_SELECT && HAVE_SYS_SELECT_H # define EV_USE_SELECT 1 # else # define EV_USE_SELECT 0 # endif # endif # ifndef EV_USE_POLL # if HAVE_POLL && HAVE_POLL_H # define EV_USE_POLL 1 # else # define EV_USE_POLL 0 # endif # endif # ifndef EV_USE_EPOLL # if HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H # define EV_USE_EPOLL 1 # else # define EV_USE_EPOLL 0 # endif # endif # ifndef EV_USE_KQUEUE # if HAVE_KQUEUE && HAVE_SYS_EVENT_H && HAVE_SYS_QUEUE_H # define EV_USE_KQUEUE 1 # else # define EV_USE_KQUEUE 0 # endif # endif # ifndef EV_USE_PORT # if HAVE_PORT_H && HAVE_PORT_CREATE # define EV_USE_PORT 1 # else # define EV_USE_PORT 0 # endif # endif # ifndef EV_USE_INOTIFY # if HAVE_INOTIFY_INIT && HAVE_SYS_INOTIFY_H # define EV_USE_INOTIFY 1 # else # define EV_USE_INOTIFY 0 # endif # endif # ifndef EV_USE_EVENTFD # if HAVE_EVENTFD # define EV_USE_EVENTFD 1 # else # define EV_USE_EVENTFD 0 # endif # endif #endif #include <math.h> #include <stdlib.h> #include <fcntl.h> #include <stddef.h> #include <stdio.h> #include <assert.h> #include <errno.h> #include <sys/types.h> #include <time.h> #include <signal.h> #ifdef EV_H # include EV_H #else # include "ev.h" #endif #ifndef _WIN32 # include <sys/time.h> # include <sys/wait.h> # include <unistd.h> #else # include <io.h> # define WIN32_LEAN_AND_MEAN # include <windows.h> # ifndef EV_SELECT_IS_WINSOCKET # define EV_SELECT_IS_WINSOCKET 1 # endif #endif /* this block tries to deduce configuration from header-defined symbols and defaults */ #ifndef EV_USE_CLOCK_SYSCALL # if __linux && __GLIBC__ >= 2 # define EV_USE_CLOCK_SYSCALL 1 # else # define EV_USE_CLOCK_SYSCALL 0 # endif #endif #ifndef EV_USE_MONOTONIC # if defined (_POSIX_MONOTONIC_CLOCK) && _POSIX_MONOTONIC_CLOCK >= 0 # define EV_USE_MONOTONIC 1 # 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 1 # else # define EV_USE_NANOSLEEP 0 # endif #endif #ifndef EV_USE_SELECT # define EV_USE_SELECT 1 #endif #ifndef EV_USE_POLL # ifdef _WIN32 # define EV_USE_POLL 0 # else # define EV_USE_POLL 1 # endif #endif #ifndef EV_USE_EPOLL # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4)) # define EV_USE_EPOLL 1 # 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 1 # else # define EV_USE_INOTIFY 0 # endif #endif #ifndef EV_PID_HASHSIZE # if EV_MINIMAL # define EV_PID_HASHSIZE 1 # else # define EV_PID_HASHSIZE 16 # endif #endif #ifndef EV_INOTIFY_HASHSIZE # if EV_MINIMAL # define EV_INOTIFY_HASHSIZE 1 # else # define EV_INOTIFY_HASHSIZE 16 # endif #endif #ifndef EV_USE_EVENTFD # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7)) # define EV_USE_EVENTFD 1 # else # define EV_USE_EVENTFD 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_MINIMAL #endif #ifndef EV_USE_4HEAP # define EV_USE_4HEAP !EV_MINIMAL #endif #ifndef EV_HEAP_CACHE_AT # define EV_HEAP_CACHE_AT !EV_MINIMAL #endif /* on linux, we can use a (slow) syscall to avoid a dependency on pthread, */ /* which makes programs even slower. might work on other unices, too. */ #if EV_USE_CLOCK_SYSCALL # include <syscall.h> # 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 # ifndef _WIN32 # include <sys/select.h> # endif #endif #if EV_USE_INOTIFY # include <sys/utsname.h> # include <sys/statfs.h> # include <sys/inotify.h> /* some very old inotify.h headers don't have IN_DONT_FOLLOW */ # ifndef IN_DONT_FOLLOW # undef EV_USE_INOTIFY # define EV_USE_INOTIFY 0 # endif #endif #if EV_SELECT_IS_WINSOCKET # include <winsock.h> #endif #if EV_USE_EVENTFD /* our minimum requirement is glibc 2.7 which has the stub, but not the header */ # include <stdint.h> # ifdef __cplusplus extern "C" { # endif int eventfd (unsigned int initval, int flags); # ifdef __cplusplus } # endif #endif /**/ #if EV_VERIFY >= 3 # define EV_FREQUENT_CHECK ev_loop_verif