mirror of https://git.ffmpeg.org/ffmpeg.git
397 lines
12 KiB
C
397 lines
12 KiB
C
/*
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* Copyright (C) 2010-2011 x264 project
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*
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* Authors: Steven Walters <kemuri9@gmail.com>
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* Pegasys Inc. <http://www.pegasys-inc.com>
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* w32threads to pthreads wrapper
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*/
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#ifndef LIBAV_COMPAT_W32PTHREADS_H
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#define LIBAV_COMPAT_W32PTHREADS_H
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/* Build up a pthread-like API using underlying Windows API. Have only static
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* methods so as to not conflict with a potentially linked in pthread-win32
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* library.
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* As most functions here are used without checking return values,
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* only implement return values as necessary. */
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#define WIN32_LEAN_AND_MEAN
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#include <windows.h>
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#include <process.h>
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#include "libavutil/attributes.h"
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#include "libavutil/internal.h"
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#include "libavutil/mem.h"
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typedef struct pthread_t {
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void *handle;
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void *(*func)(void* arg);
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void *arg;
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void *ret;
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} pthread_t;
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/* the conditional variable api for windows 6.0+ uses critical sections and
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* not mutexes */
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typedef CRITICAL_SECTION pthread_mutex_t;
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/* This is the CONDITION_VARIABLE typedef for using Windows' native
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* conditional variables on kernels 6.0+. */
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#if HAVE_CONDITION_VARIABLE_PTR
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typedef CONDITION_VARIABLE pthread_cond_t;
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#else
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typedef struct pthread_cond_t {
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void *Ptr;
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} pthread_cond_t;
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#endif
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#if _WIN32_WINNT >= 0x0600
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#define InitializeCriticalSection(x) InitializeCriticalSectionEx(x, 0, 0)
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#define WaitForSingleObject(a, b) WaitForSingleObjectEx(a, b, FALSE)
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#endif
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static av_unused unsigned __stdcall attribute_align_arg win32thread_worker(void *arg)
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{
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pthread_t *h = arg;
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h->ret = h->func(h->arg);
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return 0;
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}
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static av_unused int pthread_create(pthread_t *thread, const void *unused_attr,
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void *(*start_routine)(void*), void *arg)
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{
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thread->func = start_routine;
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thread->arg = arg;
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thread->handle = (void*)_beginthreadex(NULL, 0, win32thread_worker, thread,
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0, NULL);
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return !thread->handle;
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}
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static av_unused void pthread_join(pthread_t thread, void **value_ptr)
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{
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DWORD ret = WaitForSingleObject(thread.handle, INFINITE);
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if (ret != WAIT_OBJECT_0)
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return;
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if (value_ptr)
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*value_ptr = thread.ret;
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CloseHandle(thread.handle);
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}
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static inline int pthread_mutex_init(pthread_mutex_t *m, void* attr)
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{
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InitializeCriticalSection(m);
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return 0;
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}
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static inline int pthread_mutex_destroy(pthread_mutex_t *m)
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{
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DeleteCriticalSection(m);
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return 0;
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}
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static inline int pthread_mutex_lock(pthread_mutex_t *m)
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{
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EnterCriticalSection(m);
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return 0;
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}
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static inline int pthread_mutex_unlock(pthread_mutex_t *m)
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{
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LeaveCriticalSection(m);
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return 0;
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}
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#if _WIN32_WINNT >= 0x0600
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typedef INIT_ONCE pthread_once_t;
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#define PTHREAD_ONCE_INIT INIT_ONCE_STATIC_INIT
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static av_unused int pthread_once(pthread_once_t *once_control, void (*init_routine)(void))
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{
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BOOL pending = FALSE;
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InitOnceBeginInitialize(once_control, 0, &pending, NULL);
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if (pending)
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init_routine();
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InitOnceComplete(once_control, 0, NULL);
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return 0;
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}
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static inline void pthread_cond_init(pthread_cond_t *cond, const void *unused_attr)
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{
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InitializeConditionVariable(cond);
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}
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/* native condition variables do not destroy */
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static inline void pthread_cond_destroy(pthread_cond_t *cond)
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{
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return;
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}
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static inline void pthread_cond_broadcast(pthread_cond_t *cond)
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{
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WakeAllConditionVariable(cond);
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}
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static inline int pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex)
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{
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SleepConditionVariableCS(cond, mutex, INFINITE);
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return 0;
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}
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static inline void pthread_cond_signal(pthread_cond_t *cond)
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{
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WakeConditionVariable(cond);
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}
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#else // _WIN32_WINNT < 0x0600
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/* atomic init state of dynamically loaded functions */
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static LONG w32thread_init_state = 0;
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static av_unused void w32thread_init(void);
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/* for pre-Windows 6.0 platforms, define INIT_ONCE struct,
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* compatible to the one used in the native API */
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typedef union pthread_once_t {
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void * Ptr; ///< For the Windows 6.0+ native functions
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LONG state; ///< For the pre-Windows 6.0 compat code
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} pthread_once_t;
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#define PTHREAD_ONCE_INIT {0}
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/* function pointers to init once API on windows 6.0+ kernels */
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static BOOL (WINAPI *initonce_begin)(pthread_once_t *lpInitOnce, DWORD dwFlags, BOOL *fPending, void **lpContext);
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static BOOL (WINAPI *initonce_complete)(pthread_once_t *lpInitOnce, DWORD dwFlags, void *lpContext);
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/* pre-Windows 6.0 compat using a spin-lock */
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static inline void w32thread_once_fallback(LONG volatile *state, void (*init_routine)(void))
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{
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switch (InterlockedCompareExchange(state, 1, 0)) {
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/* Initial run */
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case 0:
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init_routine();
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InterlockedExchange(state, 2);
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break;
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/* Another thread is running init */
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case 1:
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while (1) {
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MemoryBarrier();
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if (*state == 2)
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break;
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Sleep(0);
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}
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break;
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/* Initialization complete */
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case 2:
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break;
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}
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}
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static av_unused int pthread_once(pthread_once_t *once_control, void (*init_routine)(void))
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{
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w32thread_once_fallback(&w32thread_init_state, w32thread_init);
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/* Use native functions on Windows 6.0+ */
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if (initonce_begin && initonce_complete) {
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BOOL pending = FALSE;
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initonce_begin(once_control, 0, &pending, NULL);
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if (pending)
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init_routine();
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initonce_complete(once_control, 0, NULL);
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return 0;
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}
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w32thread_once_fallback(&once_control->state, init_routine);
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return 0;
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}
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/* for pre-Windows 6.0 platforms we need to define and use our own condition
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* variable and api */
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typedef struct win32_cond_t {
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pthread_mutex_t mtx_broadcast;
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pthread_mutex_t mtx_waiter_count;
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volatile int waiter_count;
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HANDLE semaphore;
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HANDLE waiters_done;
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volatile int is_broadcast;
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} win32_cond_t;
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/* function pointers to conditional variable API on windows 6.0+ kernels */
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static void (WINAPI *cond_broadcast)(pthread_cond_t *cond);
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static void (WINAPI *cond_init)(pthread_cond_t *cond);
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static void (WINAPI *cond_signal)(pthread_cond_t *cond);
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static BOOL (WINAPI *cond_wait)(pthread_cond_t *cond, pthread_mutex_t *mutex,
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DWORD milliseconds);
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static av_unused void pthread_cond_init(pthread_cond_t *cond, const void *unused_attr)
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{
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win32_cond_t *win32_cond = NULL;
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w32thread_once_fallback(&w32thread_init_state, w32thread_init);
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if (cond_init) {
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cond_init(cond);
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return;
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}
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/* non native condition variables */
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win32_cond = av_mallocz(sizeof(win32_cond_t));
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if (!win32_cond)
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return;
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cond->Ptr = win32_cond;
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win32_cond->semaphore = CreateSemaphore(NULL, 0, 0x7fffffff, NULL);
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if (!win32_cond->semaphore)
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return;
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win32_cond->waiters_done = CreateEvent(NULL, TRUE, FALSE, NULL);
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if (!win32_cond->waiters_done)
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return;
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pthread_mutex_init(&win32_cond->mtx_waiter_count, NULL);
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pthread_mutex_init(&win32_cond->mtx_broadcast, NULL);
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}
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static av_unused void pthread_cond_destroy(pthread_cond_t *cond)
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{
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win32_cond_t *win32_cond = cond->Ptr;
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/* native condition variables do not destroy */
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if (cond_init)
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return;
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/* non native condition variables */
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CloseHandle(win32_cond->semaphore);
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CloseHandle(win32_cond->waiters_done);
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pthread_mutex_destroy(&win32_cond->mtx_waiter_count);
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pthread_mutex_destroy(&win32_cond->mtx_broadcast);
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av_freep(&win32_cond);
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cond->Ptr = NULL;
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}
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static av_unused void pthread_cond_broadcast(pthread_cond_t *cond)
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{
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win32_cond_t *win32_cond = cond->Ptr;
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int have_waiter;
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if (cond_broadcast) {
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cond_broadcast(cond);
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return;
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}
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/* non native condition variables */
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pthread_mutex_lock(&win32_cond->mtx_broadcast);
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pthread_mutex_lock(&win32_cond->mtx_waiter_count);
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have_waiter = 0;
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if (win32_cond->waiter_count) {
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win32_cond->is_broadcast = 1;
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have_waiter = 1;
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}
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if (have_waiter) {
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ReleaseSemaphore(win32_cond->semaphore, win32_cond->waiter_count, NULL);
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pthread_mutex_unlock(&win32_cond->mtx_waiter_count);
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WaitForSingleObject(win32_cond->waiters_done, INFINITE);
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ResetEvent(win32_cond->waiters_done);
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win32_cond->is_broadcast = 0;
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} else
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pthread_mutex_unlock(&win32_cond->mtx_waiter_count);
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pthread_mutex_unlock(&win32_cond->mtx_broadcast);
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}
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static av_unused int pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex)
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{
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win32_cond_t *win32_cond = cond->Ptr;
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int last_waiter;
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if (cond_wait) {
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cond_wait(cond, mutex, INFINITE);
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return 0;
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}
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/* non native condition variables */
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pthread_mutex_lock(&win32_cond->mtx_broadcast);
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pthread_mutex_lock(&win32_cond->mtx_waiter_count);
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win32_cond->waiter_count++;
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pthread_mutex_unlock(&win32_cond->mtx_waiter_count);
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pthread_mutex_unlock(&win32_cond->mtx_broadcast);
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// unlock the external mutex
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pthread_mutex_unlock(mutex);
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WaitForSingleObject(win32_cond->semaphore, INFINITE);
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pthread_mutex_lock(&win32_cond->mtx_waiter_count);
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win32_cond->waiter_count--;
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last_waiter = !win32_cond->waiter_count || !win32_cond->is_broadcast;
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pthread_mutex_unlock(&win32_cond->mtx_waiter_count);
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if (last_waiter)
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SetEvent(win32_cond->waiters_done);
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// lock the external mutex
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return pthread_mutex_lock(mutex);
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}
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static av_unused void pthread_cond_signal(pthread_cond_t *cond)
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{
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win32_cond_t *win32_cond = cond->Ptr;
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int have_waiter;
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if (cond_signal) {
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cond_signal(cond);
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return;
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}
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pthread_mutex_lock(&win32_cond->mtx_broadcast);
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/* non-native condition variables */
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pthread_mutex_lock(&win32_cond->mtx_waiter_count);
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have_waiter = win32_cond->waiter_count;
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pthread_mutex_unlock(&win32_cond->mtx_waiter_count);
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if (have_waiter) {
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ReleaseSemaphore(win32_cond->semaphore, 1, NULL);
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WaitForSingleObject(win32_cond->waiters_done, INFINITE);
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ResetEvent(win32_cond->waiters_done);
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}
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pthread_mutex_unlock(&win32_cond->mtx_broadcast);
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}
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#endif
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static av_unused void w32thread_init(void)
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{
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#if _WIN32_WINNT < 0x0600
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HANDLE kernel_dll = GetModuleHandle(TEXT("kernel32.dll"));
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/* if one is available, then they should all be available */
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cond_init =
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(void*)GetProcAddress(kernel_dll, "InitializeConditionVariable");
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cond_broadcast =
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(void*)GetProcAddress(kernel_dll, "WakeAllConditionVariable");
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cond_signal =
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(void*)GetProcAddress(kernel_dll, "WakeConditionVariable");
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cond_wait =
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(void*)GetProcAddress(kernel_dll, "SleepConditionVariableCS");
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initonce_begin =
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(void*)GetProcAddress(kernel_dll, "InitOnceBeginInitialize");
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initonce_complete =
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(void*)GetProcAddress(kernel_dll, "InitOnceComplete");
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#endif
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}
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#endif /* LIBAV_COMPAT_W32PTHREADS_H */
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