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/*****************************************************************************
* Copyright (C) 2013-2020 MulticoreWare, Inc
*
* Authors: Steve Borho <steve@borho.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111, USA.
*
* This program is also available under a commercial proprietary license.
* For more information, contact us at license @ x265.com
*****************************************************************************/
#include "threading.h"
#if defined(_WIN32) && (_WIN32_WINNT < 0x0600) // _WIN32_WINNT_VISTA
namespace X265_NS {
/* Mimic CONDITION_VARIABLE functions only supported on Vista+ */
int WINAPI cond_init(ConditionVariable *cond)
{ // InitializeConditionVariable
cond->semaphore = CreateSemaphore(NULL, 0, 0x7fffffff, NULL);
if (!cond->semaphore)
return -1;
cond->waitersDone = CreateEvent(NULL, FALSE, FALSE, NULL);
if (!cond->waitersDone)
return -1;
InitializeCriticalSection(&cond->waiterCountMutex);
InitializeCriticalSection(&cond->broadcastMutex);
cond->waiterCount = 0;
cond->bIsBroadcast = false;
return 0;
}
void WINAPI cond_broadcast(ConditionVariable *cond)
{ // WakeAllConditionVariable
EnterCriticalSection(&cond->broadcastMutex);
EnterCriticalSection(&cond->waiterCountMutex);
int haveWaiter = 0;
if (cond->waiterCount)
{
cond->bIsBroadcast = 1;
haveWaiter = 1;
}
if (haveWaiter)
{
ReleaseSemaphore(cond->semaphore, cond->waiterCount, NULL);
LeaveCriticalSection(&cond->waiterCountMutex);
WaitForSingleObject(cond->waitersDone, INFINITE);
cond->bIsBroadcast = 0;
}
else
LeaveCriticalSection(&cond->waiterCountMutex);
LeaveCriticalSection(&cond->broadcastMutex);
}
void WINAPI cond_signal(ConditionVariable *cond)
{ // WakeConditionVariable
EnterCriticalSection(&cond->broadcastMutex);
EnterCriticalSection(&cond->waiterCountMutex);
int haveWaiter = cond->waiterCount;
LeaveCriticalSection(&cond->waiterCountMutex);
if (haveWaiter)
{
ReleaseSemaphore(cond->semaphore, 1, NULL);
WaitForSingleObject(cond->waitersDone, INFINITE);
}
LeaveCriticalSection(&cond->broadcastMutex);
}
BOOL WINAPI cond_wait(ConditionVariable *cond, CRITICAL_SECTION *mutex, DWORD wait)
{ // SleepConditionVariableCS
EnterCriticalSection(&cond->broadcastMutex);
EnterCriticalSection(&cond->waiterCountMutex);
cond->waiterCount++;
LeaveCriticalSection(&cond->waiterCountMutex);
LeaveCriticalSection(&cond->broadcastMutex);
// unlock the external mutex
LeaveCriticalSection(mutex);
BOOL ret = WaitForSingleObject(cond->semaphore, wait);
EnterCriticalSection(&cond->waiterCountMutex);
cond->waiterCount--;
int last_waiter = !cond->waiterCount || !cond->bIsBroadcast;
LeaveCriticalSection(&cond->waiterCountMutex);
if (last_waiter)
SetEvent(cond->waitersDone);
// lock the external mutex
EnterCriticalSection(mutex);
// returns false on timeout or error
return ret;
}
/* Native CONDITION_VARIABLE instances are not freed, so this is a special case */
void cond_destroy(ConditionVariable *cond)
{
CloseHandle(cond->semaphore);
CloseHandle(cond->waitersDone);
DeleteCriticalSection(&cond->broadcastMutex);
DeleteCriticalSection(&cond->waiterCountMutex);
}
} // namespace X265_NS
#elif defined(_MSC_VER)
namespace { int _avoid_linker_warnings = 0; }
#endif // _WIN32_WINNT <= _WIN32_WINNT_WINXP
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