// 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 : sem_trywait.cpp
// Part of : PThread library
// sem_trywait call is implemented.
// Version:
//
#include <e32def.h>
#include <errno.h>
#include "semaphore.h"
#include "semaphoretypes.h"
#include "pthread.h"
EXPORT_C int sem_trywait (sem_t * sem)
{
if (!sem || !(*sem))
{
errno = EINVAL;
return -1;
}
_sem_t* gsem = *sem;
if(gsem->iState != _sem_t::EInitialized)
{
errno = EINVAL;
return -1;
}
if(gsem->iCount <=0)
{
errno = EAGAIN;
return -1;
}
gsem->iMutex.Wait();
if(gsem->iState != _sem_t::EInitialized)
{
errno = EINVAL;
return -1;
}
//mutex still locked
int retval=0;
if(gsem->iCount > 0)
{
gsem->iCount--;
retval = 0;
}
else
{
errno = EAGAIN;
retval = -1;
}
gsem->iMutex.Signal();
return retval;
}//sem_trywait
//End of File