// Copyright (c) 2005-2009 Nokia Corporation and/or its subsidiary(-ies).
// All rights reserved.
// This component and the accompanying materials are made available
// under the terms of "Eclipse Public License v1.0"
// which accompanies this distribution, and is available
// at the URL "http://www.eclipse.org/legal/epl-v10.html".
//
// Initial Contributors:
// Nokia Corporation - initial contribution.
//
// Contributors:
//
// Description:
// Name : pthread_mutex_unlock.cpp
// Part of : pthread
// Interface : POSIX, pthread
// POSIX implementation of mutexes on Symbian
// Version :
//
#include "mutextypes.h"
EXPORT_C int pthread_mutex_unlock (pthread_mutex_t * mutex)
{
if( !VALID_MUTEX(mutex) )
{
return EINVAL;
}
_pthread_mutex_t* pMutex = mutex->iPtr;
pthread_t self;
int retval = 0;
pMutex->iDataLock.Wait();
if(mutex->iState == _EDestroyed)
{
pMutex->iDataLock.Signal();
return EINVAL;
}
switch(pMutex->iMutexType)
{
case PTHREAD_MUTEX_NORMAL:
{
self = pthread_self();
if( (pMutex->iLockingThread != self) )
{
retval = EPERM;
break;
}
pMutex->iSignalSemaphore.Signal();
pMutex->iSemaphoreState--;
pMutex->iLockingThread = 0;
break;
}
case PTHREAD_MUTEX_RECURSIVE:
{
self = pthread_self();
if(pMutex->iLockingThread == self)
{
pMutex->iCount--;
if(pMutex->iCount == 0)
{
pMutex->iSemaphoreState--;
pMutex->iLockingThread = 0;
pMutex->iSignalSemaphore.Signal();
}
}
else
{
retval = EPERM;
}
break;
}
case PTHREAD_MUTEX_ERRORCHECK:
{
self = pthread_self();
if( (pMutex->iLockingThread != self) )
{
retval = EPERM;
break;
}
pMutex->iSignalSemaphore.Signal();
pMutex->iSemaphoreState--;
pMutex->iLockingThread = 0;
break;
}
default:
retval = ENOSYS;
break;
} //switch
pMutex->iDataLock.Signal();
return retval;
}
// End of File