Trying to Acquire a Write Lock

Use rw_trywrlock(3C) to attempt to acquire a write lock on the read-write lock pointed to by rwlp.

rw_trywrlock Syntax

#include <synch.h>  (or #include <thread.h>)

int rw_trywrlock(rwlock_t *rwlp);

When the read-write lock is already locked for reading or writing, rw_trywrlock() returns an error. For POSIX threads, see pthread_rwlock_trywrlock Syntax.

rw_trywrlock Return Values

rw_trywrlock() returns zero after completing successfully. Any other return value indicates that an error occurred. When any of the following conditions occurs, the function fails and returns the corresponding value.

Description: Invalid argument.

Description: rwlp points to an illegal address.

Description: The read-write lock pointed to by rwlp was already locked.