pthread_rwlock_destroy.c

让你了解Unix进程间的通信是如何实现的

/* include destroy */
#include	"unpipc.h"
#include	"pthread_rwlock.h"

int
pthread_rwlock_destroy(pthread_rwlock_t *rw)
{
	if (rw->rw_magic != RW_MAGIC)
		return(EINVAL);
	if (rw->rw_refcount != 0 ||
		rw->rw_nwaitreaders != 0 || rw->rw_nwaitwriters != 0)
		return(EBUSY);

	pthread_mutex_destroy(&rw->rw_mutex);
	pthread_cond_destroy(&rw->rw_condreaders);
	pthread_cond_destroy(&rw->rw_condwriters);
	rw->rw_magic = 0;

	return(0);
}
/* end destroy */

void
Pthread_rwlock_destroy(pthread_rwlock_t *rw)
{
	int		n;

	if ( (n = pthread_rwlock_destroy(rw)) == 0)
		return;
	errno = n;
	err_sys("pthread_rwlock_destroy error");
}