#ifndef _LTHREAD_RDWR_H
#define _LTHREAD_RDWR_H 1

/********************************************************
 * An example source module to accompany...
 *
 * "Using POSIX Threads: Programming with Pthreads"
 *     by Brad nichols, Dick Buttlar, Jackie Farrell
 *     O'Reilly & Associates, Inc.
 *
 ********************************************************
 * 
 * Include file for reader/writer locks
 * 
 */

typedef struct rdwr_var {
	int readers_reading;
	int writer_writing;
	pthread_mutex_t mutex;
	pthread_cond_t lock_free;
} pthread_rdwr_t;

typedef void * pthread_rdwrattr_t;

#define pthread_rdwrattr_default NULL;

int pthread_rdwr_init_np(pthread_rdwr_t *rdwrp, pthread_rdwrattr_t *attrp);
int pthread_rdwr_rlock_np(pthread_rdwr_t *rdwrp);
int pthread_rdwr_runlock_np(pthread_rdwr_t *rdwrp);
int pthread_rdwr_wlock_np(pthread_rdwr_t *rdwrp);
int pthread_rdwr_wunlock_np(pthread_rdwr_t *rdwrp);

#endif /* _LTHREAD_RDWR_H */