/* * Copyright (C) 2010-2011 x264 project * * Authors: Steven Walters <kemuri9@gmail.com> * Pegasys Inc. <http://www.pegasys-inc.com> * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file * w32threads to pthreads wrapper */ #ifndef COMPAT_W32PTHREADS_H #define COMPAT_W32PTHREADS_H /* Build up a pthread-like API using underlying Windows API. Have only static * methods so as to not conflict with a potentially linked in pthread-win32 * library. * As most functions here are used without checking return values, * only implement return values as necessary. */ #define WIN32_LEAN_AND_MEAN #include <windows.h> #include <process.h> #include <time.h> #include "libavutil/attributes.h" #include "libavutil/common.h" #include "libavutil/internal.h" #include "libavutil/mem.h" #include "libavutil/time.h" typedef struct pthread_t { void *handle; void *(*func)(void* arg); void *arg; void *ret; } pthread_t; /* use light weight mutex/condition variable API for Windows Vista and later */ typedef SRWLOCK pthread_mutex_t; typedef CONDITION_VARIABLE pthread_cond_t; #define PTHREAD_MUTEX_INITIALIZER SRWLOCK_INIT #define PTHREAD_COND_INITIALIZER CONDITION_VARIABLE_INIT #define InitializeCriticalSection(x) InitializeCriticalSectionEx(x, 0, 0) #define WaitForSingleObject(a, b) WaitForSingleObjectEx(a, b, FALSE) #define PTHREAD_CANCEL_ENABLE 1 #define PTHREAD_CANCEL_DISABLE 0 static av_unused unsigned __stdcall attribute_align_arg win32thread_worker(void *arg) { pthread_t *h = (pthread_t*)arg; h->ret = h->func(h->arg); return 0; } static av_unused int pthread_create(pthread_t *thread, const void *unused_attr, void *(*start_routine)(void*), void *arg) { thread->func = start_routine; thread->arg = arg; #if HAVE_WINRT thread->handle = (void*)CreateThread(NULL, 0, win32thread_worker, thread, 0, NULL); #else thread->handle = (void*)_beginthreadex(NULL, 0, win32thread_worker, thread, 0, NULL); #endif return !thread->handle; } static av_unused int pthread_join(pthread_t thread, void **value_ptr) { DWORD ret = WaitForSingleObject(thread.handle, INFINITE); if (ret != WAIT_OBJECT_0) { if (ret == WAIT_ABANDONED) return EINVAL; else return EDEADLK; } if (value_ptr) *value_ptr = thread.ret; CloseHandle(thread.handle); return 0; } static inline int pthread_mutex_init(pthread_mutex_t *m, void* attr) { InitializeSRWLock(m); return 0; } static inline int pthread_mutex_destroy(pthread_mutex_t *m) { /* Unlocked SWR locks use no resources */ return 0; } static inline int pthread_mutex_lock(pthread_mutex_t *m) { AcquireSRWLockExclusive(m); return 0; } static inline int pthread_mutex_unlock(pthread_mutex_t *m) { ReleaseSRWLockExclusive(m); return 0; } typedef INIT_ONCE pthread_once_t; #define PTHREAD_ONCE_INIT INIT_ONCE_STATIC_INIT static av_unused int pthread_once(pthread_once_t *once_control, void (*init_routine)(void)) { BOOL pending = FALSE; InitOnceBeginInitialize(once_control, 0, &pending, NULL); if (pending) init_routine(); InitOnceComplete(once_control, 0, NULL); return 0; } static inline int pthread_cond_init(pthread_cond_t *cond, const void *unused_attr) { InitializeConditionVariable(cond); return 0; } /* native condition variables do not destroy */ static inline int pthread_cond_destroy(pthread_cond_t *cond) { return 0; } static inline int pthread_cond_broadcast(pthread_cond_t *cond) { WakeAllConditionVariable(cond); return 0; } static inline int pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex) { SleepConditionVariableSRW(cond, mutex, INFINITE, 0); return 0; } static inline int pthread_cond_timedwait(pthread_cond_t *cond, pthread_mutex_t *mutex, const struct timespec *abstime) { int64_t abs_milli = abstime->tv_sec * 1000LL + abstime->tv_nsec / 1000000; DWORD t = av_clip64(abs_milli - av_gettime() / 1000, 0, UINT32_MAX); if (!SleepConditionVariableSRW(cond, mutex, t, 0)) { DWORD err = GetLastError(); if (err == ERROR_TIMEOUT) return ETIMEDOUT; else return EINVAL; } return 0; } static inline int pthread_cond_signal(pthread_cond_t *cond) { WakeConditionVariable(cond); return 0; } static inline int pthread_setcancelstate(int state, int *oldstate) { return 0; } #endif /* COMPAT_W32PTHREADS_H */