NAME

pthread_barrierattr_destroy, pthread_barrierattr_init — destroy and initialize the barrier attributes object

SYNOPSIS

#include <pthread.h>

int pthread_barrierattr_destroy(pthread_barrierattr_t *attr);
int pthread_barrierattr_init(pthread_barrierattr_t *attr);


DESCRIPTION

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

The pthread_barrierattr_init() function shall initialize a barrier attributes object attr with the default value for all of the attributes defined by the implementation.

If pthread_barrierattr_init() is called specifying an already initialized attr attributes object, the results are undefined.

After a barrier attributes object has been used to initialize one or more barriers, any function affecting the attributes object (including destruction) shall not affect any previously initialized barrier.

The behavior is undefined if the value specified by the attr argument to pthread_barrierattr_destroy() does not refer to an initialized barrier attributes object.

RETURN VALUE

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

ERRORS

The pthread_barrierattr_init() function shall fail if:

[ENOMEM]

Insufficient memory exists to initialize the barrier attributes object.

These functions shall not return an error code of [EINTR].

EXAMPLES

None.

APPLICATION USAGE

None.

RATIONALE

If an implementation detects that the value specified by the attr argument to pthread_barrierattr_destroy() does not refer to an initialized barrier attributes object, it is recommended that the function should fail and report an [EINVAL] error.

FUTURE DIRECTIONS

None.

SEE ALSO

pthread_barrierattr_getpshared

XBD <pthread.h>

CHANGE HISTORY

First released in Issue 6. Derived from IEEE Std 1003.1j-2000.

In the SYNOPSIS, the inclusion of <sys/types.h> is no longer required.

Issue 7

The pthread_barrierattr_destroy() and pthread_barrierattr_init() functions are moved from the Barriers option to the Base.

The [EINVAL] error for an uninitialized barrier attributes object is removed; this condition results in undefined behavior.