/*************************************************************************
 *
 * 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
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 * 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.
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 ************************************************************************/

#include "system.h"

#include <osl/diagnose.h>
#include <osl/semaphor.h>

/*
	Implemetation notes:
	The void* represented by oslSemaphore is used
	to store a WIN32 HANDLE.
*/


/*****************************************************************************/
/* osl_createSemaphore */
/*****************************************************************************/
oslSemaphore SAL_CALL osl_createSemaphore(sal_uInt32 initialCount) 
{
	oslSemaphore Semaphore;

	Semaphore= CreateSemaphore(0, initialCount, INT_MAX, 0);

	/* create failed? */
	if((HANDLE)Semaphore == INVALID_HANDLE_VALUE)
	{
		Semaphore= 0;
	}

	return Semaphore;  
}

/*****************************************************************************/
/* osl_destroySemaphore */
/*****************************************************************************/
void SAL_CALL osl_destroySemaphore(oslSemaphore Semaphore) 
{

	
	if(Semaphore != 0) 
	{
		CloseHandle((HANDLE)Semaphore);
	}

}
			 
/*****************************************************************************/
/* osl_acquireSemaphore */
/*****************************************************************************/
sal_Bool SAL_CALL osl_acquireSemaphore(oslSemaphore Semaphore) 
{
	OSL_ASSERT(Semaphore != 0);

	switch ( WaitForSingleObject( (HANDLE)Semaphore, INFINITE ) )
	{
		case WAIT_OBJECT_0:
			return sal_True;

		default:
			return (sal_False);			
	}
}

/*****************************************************************************/
/* osl_tryToAcquireSemaphore */
/*****************************************************************************/
sal_Bool SAL_CALL osl_tryToAcquireSemaphore(oslSemaphore Semaphore)
{
	OSL_ASSERT(Semaphore != 0);
	return (sal_Bool)(WaitForSingleObject((HANDLE)Semaphore, 0) == WAIT_OBJECT_0);
}


/*****************************************************************************/
/* osl_releaseSemaphore */
/*****************************************************************************/
sal_Bool SAL_CALL osl_releaseSemaphore(oslSemaphore Semaphore) 
{
	OSL_ASSERT(Semaphore != 0);

    /* increase count by one, not interested in previous count */
	return (sal_Bool)(ReleaseSemaphore((HANDLE)Semaphore, 1, NULL) != FALSE);			
}