author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 02 Feb 2010 02:01:42 +0200 | |
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// Copyright (c) 2005-2009 Nokia Corporation and/or its subsidiary(-ies). |
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// All rights reserved. |
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// This component and the accompanying materials are made available |
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// under the terms of "Eclipse Public License v1.0" |
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// which accompanies this distribution, and is available |
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// at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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// |
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// Initial Contributors: |
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// Nokia Corporation - initial contribution. |
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// |
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// Contributors: |
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// |
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// Description: |
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// Name : sem_trywait.cpp |
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// Part of : PThread library |
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// sem_trywait call is implemented. |
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// Version: |
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// |
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#include <e32def.h> |
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#include <errno.h> |
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#include "semaphore.h" |
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#include "semaphoretypes.h" |
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#include "pthread.h" |
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EXPORT_C int sem_trywait (sem_t * sem) |
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{ |
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if (!sem || !(*sem)) |
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{ |
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errno = EINVAL; |
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return -1; |
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} |
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_sem_t* gsem = *sem; |
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if(gsem->iState != _sem_t::EInitialized) |
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{ |
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errno = EINVAL; |
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return -1; |
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} |
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if(gsem->iCount <=0) |
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{ |
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errno = EAGAIN; |
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return -1; |
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} |
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gsem->iMutex.Wait(); |
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if(gsem->iState != _sem_t::EInitialized) |
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{ |
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errno = EINVAL; |
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return -1; |
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} |
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//mutex still locked |
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int retval=0; |
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if(gsem->iCount > 0) |
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{ |
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gsem->iCount--; |
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retval = 0; |
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} |
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else |
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{ |
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errno = EAGAIN; |
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retval = -1; |
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} |
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gsem->iMutex.Signal(); |
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return retval; |
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}//sem_trywait |
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//End of File |
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