rw_trywrlock(3T)

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

int rw_trywrlock(rwlock_t *rwlp);

Use rw_trywrlock() to attempt to acquire a write lock on the readers/writer lock pointed to by rwlp. When the readers/writer lock is already locked for reading or writing, it returns an error.

Return Values

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

EINVAL

Invalid argument.

EFAULT

rwlp points to an illegal address.

EBUSY

The readers/writer lock pointed to by rwlp was already locked.