130 lines
4.1 KiB
C++
130 lines
4.1 KiB
C++
/*****************************************************************************
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* Copyright (C) 2013 x265 project
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*
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* Authors: Steve Borho <steve@borho.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111, USA.
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*
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* This program is also available under a commercial proprietary license.
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* For more information, contact us at license @ x265.com
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*****************************************************************************/
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#include "threading.h"
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#if defined(_WIN32) && (_WIN32_WINNT < 0x0600) // _WIN32_WINNT_VISTA
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namespace X265_NS {
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/* Mimic CONDITION_VARIABLE functions only supported on Vista+ */
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int WINAPI cond_init(ConditionVariable *cond)
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{ // InitializeConditionVariable
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cond->semaphore = CreateSemaphore(NULL, 0, 0x7fffffff, NULL);
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if (!cond->semaphore)
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return -1;
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cond->waitersDone = CreateEvent(NULL, FALSE, FALSE, NULL);
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if (!cond->waitersDone)
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return -1;
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InitializeCriticalSection(&cond->waiterCountMutex);
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InitializeCriticalSection(&cond->broadcastMutex);
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cond->waiterCount = 0;
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cond->bIsBroadcast = false;
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return 0;
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}
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void WINAPI cond_broadcast(ConditionVariable *cond)
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{ // WakeAllConditionVariable
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EnterCriticalSection(&cond->broadcastMutex);
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EnterCriticalSection(&cond->waiterCountMutex);
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int haveWaiter = 0;
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if (cond->waiterCount)
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{
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cond->bIsBroadcast = 1;
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haveWaiter = 1;
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}
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if (haveWaiter)
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{
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ReleaseSemaphore(cond->semaphore, cond->waiterCount, NULL);
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LeaveCriticalSection(&cond->waiterCountMutex);
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WaitForSingleObject(cond->waitersDone, INFINITE);
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cond->bIsBroadcast = 0;
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}
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else
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LeaveCriticalSection(&cond->waiterCountMutex);
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LeaveCriticalSection(&cond->broadcastMutex);
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}
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void WINAPI cond_signal(ConditionVariable *cond)
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{ // WakeConditionVariable
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EnterCriticalSection(&cond->broadcastMutex);
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EnterCriticalSection(&cond->waiterCountMutex);
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int haveWaiter = cond->waiterCount;
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LeaveCriticalSection(&cond->waiterCountMutex);
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if (haveWaiter)
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{
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ReleaseSemaphore(cond->semaphore, 1, NULL);
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WaitForSingleObject(cond->waitersDone, INFINITE);
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}
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LeaveCriticalSection(&cond->broadcastMutex);
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}
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BOOL WINAPI cond_wait(ConditionVariable *cond, CRITICAL_SECTION *mutex, DWORD wait)
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{ // SleepConditionVariableCS
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EnterCriticalSection(&cond->broadcastMutex);
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EnterCriticalSection(&cond->waiterCountMutex);
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cond->waiterCount++;
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LeaveCriticalSection(&cond->waiterCountMutex);
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LeaveCriticalSection(&cond->broadcastMutex);
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// unlock the external mutex
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LeaveCriticalSection(mutex);
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BOOL ret = WaitForSingleObject(cond->semaphore, wait);
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EnterCriticalSection(&cond->waiterCountMutex);
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cond->waiterCount--;
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int last_waiter = !cond->waiterCount || !cond->bIsBroadcast;
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LeaveCriticalSection(&cond->waiterCountMutex);
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if (last_waiter)
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SetEvent(cond->waitersDone);
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// lock the external mutex
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EnterCriticalSection(mutex);
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// returns false on timeout or error
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return ret;
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}
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/* Native CONDITION_VARIABLE instances are not freed, so this is a special case */
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void cond_destroy(ConditionVariable *cond)
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{
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CloseHandle(cond->semaphore);
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CloseHandle(cond->waitersDone);
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DeleteCriticalSection(&cond->broadcastMutex);
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DeleteCriticalSection(&cond->waiterCountMutex);
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}
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} // namespace X265_NS
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#elif defined(_MSC_VER)
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namespace { int _avoid_linker_warnings = 0; }
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#endif // _WIN32_WINNT <= _WIN32_WINNT_WINXP
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