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/** BEGIN COPYRIGHT BLOCK
* Copyright 2001 Sun Microsystems, Inc.
* Portions copyright 1999, 2001-2003 Netscape Communications Corporation.
* All rights reserved.
* END COPYRIGHT BLOCK **/
#ifndef _RWLOCK_H_
#define _RWLOCK_H_
#include <prlock.h>
#include <prcvar.h>
typedef struct _rwl {
PRLock *rwl_readers_mutex;
PRLock *rwl_writers_mutex;
PRCondVar *rwl_writer_waiting_cv;
int rwl_num_readers;
int rwl_writer_waiting;
int (*rwl_acquire_read_lock)( struct _rwl * );
int (*rwl_relinquish_read_lock)( struct _rwl * );
int (*rwl_acquire_write_lock)( struct _rwl * );
int (*rwl_relinquish_write_lock)( struct _rwl * );
} rwl;
extern rwl *rwl_new();
extern void rwl_free( rwl **rh );
#endif /* _RWLOCK_H_ */
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