rw_trywrlock(3THR)

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

int rw_trywrlock(rwlock_t *rwlp);

Use rw_trywrlock(3THR) to attempt to acquire a write lock on the read-write lock pointed to by rwlp. When the read-write lock is already locked for reading or writing, it returns an error. (For POSIX threads, see pthread_rwlock_trywrlock(3THR).)

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.

EINVAL

Invalid argument.

EFAULT

rwlp points to an illegal address.

EBUSY

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