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/*************************************************************************
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* Copyright 2008 by Sun Microsystems, Inc.
*
* OpenOffice.org - a multi-platform office productivity suite
*
* $RCSfile: mutex.c,v $
* $Revision: 1.6 $
*
* 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 <sys/fmutex.h>
#include "system.h"
#include <osl/mutex.h>
#include <osl/diagnose.h>
/*
Implementation notes:
The void* hidden by oslMutex points to an OS/2 mutex semaphore.
*/
typedef struct _oslMutexImpl {
HMTX m_Mutex;
int m_Locks;
ULONG m_Owner;
ULONG m_Requests;
} oslMutexImpl;
// static mutex to control access to private members of oslMutexImpl
static HMTX MutexLock = 0;
/*****************************************************************************/
/* osl_createMutex */
/*****************************************************************************/
oslMutex SAL_CALL osl_createMutex()
{
oslMutexImpl *pMutexImpl;
HMTX hMutex;
APIRET rc;
pMutexImpl= (oslMutexImpl*)calloc(sizeof(oslMutexImpl), 1);
OSL_ASSERT(pMutexImpl); /* alloc successful? */
/* create semaphore */
rc = DosCreateMutexSem( NULL, &pMutexImpl->m_Mutex, 0, FALSE );
if( rc != 0 )
{
free(pMutexImpl);
return NULL;
}
// create static mutex for private members
if (MutexLock == 0)
DosCreateMutexSem( NULL, &MutexLock, 0, FALSE );
return (oslMutex)pMutexImpl;
}
/*****************************************************************************/
/* osl_destroyMutex */
/*****************************************************************************/
void SAL_CALL osl_destroyMutex(oslMutex Mutex)
{
oslMutexImpl *pMutexImpl = (oslMutexImpl *)Mutex;
if (pMutexImpl)
{
DosCloseMutexSem( pMutexImpl->m_Mutex);
free(pMutexImpl);
}
}
/*****************************************************************************/
/* osl_acquireMutex */
/*****************************************************************************/
sal_Bool SAL_CALL osl_acquireMutex(oslMutex Mutex)
{
oslMutexImpl *pMutexImpl = (oslMutexImpl *)Mutex;
APIRET rc = 0;
OSL_ASSERT(Mutex);
DosRequestMutexSem( MutexLock, SEM_INDEFINITE_WAIT );
pMutexImpl->m_Requests++;
DosReleaseMutexSem( MutexLock);
rc = DosRequestMutexSem( pMutexImpl->m_Mutex, SEM_INDEFINITE_WAIT );
DosRequestMutexSem( MutexLock, SEM_INDEFINITE_WAIT );
pMutexImpl->m_Requests--;
if (pMutexImpl->m_Locks++ == 0)
pMutexImpl->m_Owner = _gettid();
DosReleaseMutexSem( MutexLock);
return( rc == 0 );
}
/*****************************************************************************/
/* osl_tryToAcquireMutex */
/*****************************************************************************/
sal_Bool SAL_CALL osl_tryToAcquireMutex(oslMutex Mutex)
{
sal_Bool ret = sal_False;
oslMutexImpl *pMutexImpl = (oslMutexImpl *)Mutex;
OSL_ASSERT(Mutex);
DosRequestMutexSem( MutexLock, SEM_INDEFINITE_WAIT );
if ( ((pMutexImpl->m_Requests == 0) && (pMutexImpl->m_Locks == 0)) ||
(pMutexImpl->m_Owner == _gettid()) )
ret = osl_acquireMutex(Mutex);
DosReleaseMutexSem( MutexLock);
return ret;
}
/*****************************************************************************/
/* osl_releaseMutex */
/*****************************************************************************/
sal_Bool SAL_CALL osl_releaseMutex(oslMutex Mutex)
{
oslMutexImpl *pMutexImpl = (oslMutexImpl *)Mutex;
APIRET rc;
OSL_ASSERT(Mutex);
DosRequestMutexSem( MutexLock, SEM_INDEFINITE_WAIT );
if (--(pMutexImpl->m_Locks) == 0)
pMutexImpl->m_Owner = 0;
DosReleaseMutexSem( MutexLock);
rc = DosReleaseMutexSem( pMutexImpl->m_Mutex);
return sal_True;
}
/*****************************************************************************/
/* osl_getGlobalMutex */
/*****************************************************************************/
oslMutex g_Mutex = NULL;
oslMutex * SAL_CALL osl_getGlobalMutex(void)
{
if (g_Mutex == NULL)
g_Mutex = osl_createMutex();
return &g_Mutex;
}
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