#include <pthread.h>
int pthread_rwlock_destroy(pthread_rwlock_t *rwlock);
Threadsafe: Yes
Signal Safe: Yes

The pthread_rwlock_destroy() function destroys the named read/write lock. The destroyed read/write lock can no longer be used.

If pthread_rwlock_destroy() is called on a read/write lock on a mutex that is locked by another thread for either reading or writing, the request will fail with an EBUSY error.

If pthread_rwlock_destroy() is used by a thread when it owns the read/write lock, and other threads ware waiting for the read/write lock to become available (with calls to pthread_rwlock_rdlock(), pthread_rwlock_wrlock(), pthread_rwlock_timedrdlock_np() or pthread_rwlock_timedwrlock_np() APIs), the destruction of the read/write lock will occur safely, and the waiting threads will wake up with the EDESTROYED error. Threads calling pthread_rwlock_tryrdlock() or pthread_rwlock_trywrlock() will return with either the EBUSY or EINVAL error depending on when they called those functions.

Once a read/write lock is created, it cannot be validly copied or moved to a new location.

Parameters

rwlock

(Input) Address of the read/write lock to be destroyed.

None.

Return Value

0

pthread_rwlock_destroy() was successful.

value

pthread_rwlock_destroy() was not successful. value is set to indicate the error condition.

If pthread_rwlock_destroy() was not successful, the error condition returned usually indicates one of the following errors. Under some conditions, the value returned could indicate an error other than those listed here.

[EINVAL]

The value specified for the argument is not correct.

• The <pthread.h> header file. See Header files for Pthread functions
• pthread_rwlock_init()--Initialize a Read/Write Lock

See the pthread_rwlock_init() example