pthread_rwlock_destroy()

Destroy a read-write lock

Synopsis:

#include <pthread.h>

int pthread_rwlock_destroy( pthread_rwlock_t* rwl );

Arguments:

rwl

A pointer to a pthread_rwlock_t object that you want to destroy.

Library:

libc

Use the -l c option to qcc to link against this library. This library is usually included automatically.

Description:

The pthread_rwlock_destroy() function destroys the read-write lock referenced by rwl, and releases the system resources used by the lock. You can destroy the read-write lock if one of the following is true:

• no thread has a active shared or exclusive lock on rwl
• the calling thread has an active exclusive lock on rwl.

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After successfully destroying a read-write lock, don't use it again without reinitializing it by calling pthread_rwlock_init().

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Returns:

EOK

Success.

EBUSY

The read-write lock rwl is still in use. The calling thread doesn't have an exclusive lock.

Classification:

POSIX 1003.1 THR

See also:

pthread_rwlock_init(), pthread_rwlock_rdlock(), pthread_rwlock_tryrdlock(), pthread_rwlock_trywrlock(), pthread_rwlock_unlock(), pthread_rwlock_wrlock()

Processes and Threads chapter of Getting Started with QNX Neutrino