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/*************************************************************************
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* Copyright 2000, 2010 Oracle and/or its affiliates.
*
* OpenOffice.org - a multi-platform office productivity suite
*
* This file is part of OpenOffice.org.
*
* OpenOffice.org is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 3
* only, as published by the Free Software Foundation.
*
* OpenOffice.org 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 Lesser General Public License version 3 for more details
* (a copy is included in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU Lesser General Public License
* version 3 along with OpenOffice.org. If not, see
* <http://www.openoffice.org/license.html>
* for a copy of the LGPLv3 License.
*
************************************************************************/
#include "system.h"
#include <osl/diagnose.h>
#include <osl/semaphor.h>
/*
Implemetation notes:
The void* represented by oslSemaphore is used
to store a OS/2 HANDLE.
*/
typedef struct _oslSemaphoreImpl
{
HEV hevReachedZero;
int nCount;
} oslSemaphoreImpl;
// static mutex to control access to private members of oslMutexImpl
static HMTX MutexLock = NULL;
/*****************************************************************************/
/* osl_createSemaphore */
/*****************************************************************************/
/*
- Erzeugen der Semaphore
- Zhler auf initialCount setzen
*/
oslSemaphore SAL_CALL osl_createSemaphore(sal_uInt32 initialCount)
{
APIRET rc;
oslSemaphoreImpl * pSemaphoreImpl;
/* alloc mem. for our internal data structure */
pSemaphoreImpl = (oslSemaphoreImpl *) malloc(sizeof(oslSemaphoreImpl));
if( pSemaphoreImpl == NULL )
return NULL;
/* create semaphore */
rc = DosCreateEventSem( NULL,
&pSemaphoreImpl->hevReachedZero,
DC_SEM_SHARED,
FALSE );
if( rc != NO_ERROR )
{
free( pSemaphoreImpl );
return NULL;
}
pSemaphoreImpl->nCount = initialCount;
// create static mutex for private members
if (MutexLock == NULL)
DosCreateMutexSem( NULL, &MutexLock, 0, FALSE );
return (oslSemaphore) pSemaphoreImpl;
}
/*****************************************************************************/
/* osl_destroySemaphore */
/*****************************************************************************/
/*
- Semaphore lschen
*/
void SAL_CALL osl_destroySemaphore(oslSemaphore Semaphore)
{
oslSemaphoreImpl* pSemaphoreImpl = (oslSemaphoreImpl*)Semaphore;
OSL_ASSERT(Semaphore != 0);
DosCloseEventSem( pSemaphoreImpl->hevReachedZero );
free( pSemaphoreImpl );
}
/*****************************************************************************/
/* osl_acquireSemaphore */
/*****************************************************************************/
/*
- Zhler -1
- wenn Zhler < 0: blockieren
*/
sal_Bool SAL_CALL osl_acquireSemaphore(oslSemaphore Semaphore)
{
APIRET rc;
oslSemaphoreImpl* pSemaphoreImpl = (oslSemaphoreImpl*)Semaphore;
int nCount;
OSL_ASSERT(Semaphore != 0);
DosRequestMutexSem( MutexLock, SEM_INDEFINITE_WAIT );
while( pSemaphoreImpl->nCount < 1 )
{
sal_uInt32 nPostCount;
DosReleaseMutexSem( MutexLock);
rc = DosWaitEventSem(pSemaphoreImpl->hevReachedZero, SEM_INDEFINITE_WAIT );
DosResetEventSem(pSemaphoreImpl->hevReachedZero, &nPostCount);
DosRequestMutexSem( MutexLock, SEM_INDEFINITE_WAIT );
}
pSemaphoreImpl->nCount--;
DosReleaseMutexSem( MutexLock);
return( rc == NO_ERROR );
}
/*****************************************************************************/
/* osl_tryToAcquireSemaphore */
/*****************************************************************************/
/*
- Zhler -1, wenn vorher > 0
- wenn Zhler < 0: mit FALSE zurueck
*/
sal_Bool SAL_CALL osl_tryToAcquireSemaphore(oslSemaphore Semaphore)
{
APIRET rc;
oslSemaphoreImpl* pSemaphoreImpl = (oslSemaphoreImpl*)Semaphore;
int nCount;
OSL_ASSERT(Semaphore != 0);
DosRequestMutexSem( MutexLock, SEM_INDEFINITE_WAIT );
nCount = pSemaphoreImpl->nCount;
if( pSemaphoreImpl->nCount > 0 )
pSemaphoreImpl->nCount--;
DosReleaseMutexSem( MutexLock);
return( nCount > 0 );
}
/*****************************************************************************/
/* osl_releaseSemaphore */
/*****************************************************************************/
/*
- Zhler +1
*/
sal_Bool SAL_CALL osl_releaseSemaphore(oslSemaphore Semaphore)
{
APIRET rc;
oslSemaphoreImpl* pSemaphoreImpl = (oslSemaphoreImpl*)Semaphore;
int nCount;
OSL_ASSERT(Semaphore != 0);
DosRequestMutexSem( MutexLock, SEM_INDEFINITE_WAIT );
nCount = pSemaphoreImpl->nCount;
pSemaphoreImpl->nCount++;
DosReleaseMutexSem( MutexLock);
if( nCount == 0 )
DosPostEventSem(pSemaphoreImpl->hevReachedZero);
return( rc == NO_ERROR );
}
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