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

Name

NAME

pthread_rwlockattr_destroy, pthread_rwlockattr_init — destroy and initialize the read-write lock attributes object

SYNOPSIS

THR #include <pthread.h>

    int pthread_rwlockattr_destroy(pthread_rwlockattr_t *attr);
    int pthread_rwlockattr_init (pthread_rwlockattr_t  *attr);

DESCRIPTION

The pthread_rwlockattr_destroy() function shall destroy a read-write lock attributes object. A destroyed attr attributes object can be reinitialized using pthread_rwlockattr_init(); the results of otherwise referencing the object after it has been destroyed are undefined. An implementation may cause pthread_rwlockattr_destroy () to set the object referenced by attr to an invalid value.

The pthread_rwlockattr_init() function shall initialize a read-write lock attributes object attr with the default value for all of the attributes defined by the implementation.

Results are undefined if pthread_rwlockattr_init() is called specifying an already initialized attr attributes object.

After a read-write lock attributes object has been used to initialize one or more read-write locks, any function affecting the attributes object (including destruction) shall not affect any previously initialized read-write locks.

RETURN VALUE

If successful, the pthread_rwlockattr_destroy() and pthread_rwlockattr_init() functions shall return zero; otherwise, an error number shall be returned to indicate the error.

ERRORS

The pthread_rwlockattr_destroy () function may fail if:

[EINVAL]

The value specified by attr is invalid.

The pthread_rwlockattr_init ...