/*************************************************************************
 *
 *  $RCSfile: semaphor.h,v $
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 *  $Revision: 1.8 $
 *
 *  last change: $Author: hr $ $Date: 2003/03/26 16:45:37 $
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 *  The Contents of this file are made available subject to the terms of
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 *         - GNU Lesser General Public License Version 2.1
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 *  Sun Microsystems Inc., October, 2000
 *
 *  GNU Lesser General Public License Version 2.1
 *  =============================================
 *  Copyright 2000 by Sun Microsystems, Inc.
 *  901 San Antonio Road, Palo Alto, CA 94303, USA
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 *  Sun Industry Standards Source License Version 1.1
 *  =================================================
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 ************************************************************************/

#ifndef _OSL_SEMAPHORE_H_
#define _OSL_SEMAPHORE_H_

#ifdef __cplusplus
extern "C" {
#endif

#ifndef _SAL_TYPES_H_
#include <sal/types.h>
#endif

typedef void* oslSemaphore;

/** Creates a semaphore.<BR>
	@param InitialCount denotes the starting value the semaphore. If you set it to
	zero, the first acquire() blocks. Otherwise InitialCount acquire()s  are
	immedeatly  successfull.
	@return 0 if the semaphore could not be created, otherwise a handle to the sem.
*/
oslSemaphore SAL_CALL osl_createSemaphore(sal_uInt32 initialCount);

/** Release the OS-structures and free semaphore data-structure
	@return fbbb
*/
void SAL_CALL osl_destroySemaphore(oslSemaphore Semaphore);

/** acquire() decreases the count. It will block if it tries to
	decrease below zero.
	@return False if the system-call failed.
*/
sal_Bool SAL_CALL osl_acquireSemaphore(oslSemaphore Semaphore);

/** tryToAcquire() tries to decreases the count. It will 
	return with False if it would decrease the count below zero.
	(When acquire() would block.) If it could successfully 
	decrease the count, it will return True.
*/
sal_Bool SAL_CALL osl_tryToAcquireSemaphore(oslSemaphore Semaphore);

/** release() increases the count.
	@return False if the system-call failed.
*/
sal_Bool SAL_CALL osl_releaseSemaphore(oslSemaphore Semaphore);

#ifdef __cplusplus
}
#endif

#endif  /* _OSL_SEMAPHORE_H_  */


