rw_unlock(3synch)


rw_unlock -- release a reader-writer lock

Synopsis

   cc [options] -Kthread file
   

#include <synch.h>

int rw_unlock(rwlock_t *lock);

Description

rw_unlock releases a reader-writer lock previously acquired by rw_rdlock, rw_wrlock, rw_tryrdlock, or rw_trywrlock. The behavior differs according to whether the caller is a reader or a writer:

When rw_unlock unlocks the lock, the first waiter (reader or writer) is activated.

lock must previously have been initialized (see rwlock_init(3synch)).

Parameters


lock
pointer to the lock to be released

Return values

rw_unlock returns zero for success and an error number for failure.

Errors

If any the following conditions is detected, rw_unlock fails and returns the corresponding value:

EINVAL
invalid argument specified

ENOLCK
lock not locked

References

Intro(3synch), rwlock(3synch), rwlock_destroy(3synch), rwlock_init(3synch), rw_rdlock(3synch), rw_tryrdlock(3synch), rw_trywrlock(3synch), rw_wrlock(3synch)
© 2004 The SCO Group, Inc. All rights reserved.
UnixWare 7 Release 7.1.4 - 25 April 2004