Professional Multicore Programming: Design and Implementation for C++ Developers

Name

NAME

pthread_rwlock_destroy, pthread_rwlock_init — destroy and initialize a read-write lock object

SYNOPSIS

THR #include <pthread.h>

    int pthread_rwlock_destroy(pthread_rwlock_t *rwlock);
    int pthread_rwlock_init(pthread_rwlockt *restrict rwlock,
        const pthread_rwlockattr_t *restrict attr);

DESCRIPTION

The pthread_rwlock_destroy() function shall destroy the read-write lock object referenced by rwlock and release any resources used by the lock. The effect of subsequent use of the lock is undefined until the lock is reinitialized by another call to pthread_rwlock_init(). An implementation may cause pthread_rwlock_destroy() to set the object referenced by rwlock to an invalid value. Results are undefined if pthread_rwlock_destroy() is called when any thread holds rwlock. Attempting to destroy an uninitialized read-write lock results in undefined behavior.

The pthread_rwlock_init() function shall allocate any resources required to use the read-write lock referenced by rwlock and initializes the lock to an unlocked state with attributes referenced by attr. If attr is NULL, the default read-write lock attributes shall be used; the effect is the same as passing the address of a default read-write lock attributes object. Once initialized, the lock can be used any number of times without being reinitialized. Results are undefined if pthread_rwlock_init() is called specifying an already initialized read-write lock. Results are undefined if a read-write lock is used without first being initialized. ...