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pthread_barrierattr_init(3P)			  pthread_barrierattr_init(3P)

NAME
     pthread_barrierattr_init, pthread_barrierattr_setpshared,
     pthread_barrierattr_getpshared, pthread_barrierattr_destroy - barrier
     attributes

C SYNOPSIS
     #include <pthread.h>

     int pthread_barrierattr_init(pthread_barrierattr_t *attr);

     int pthread_barrierattr_setpshared(pthread_barrierattr_t *attr,
     int pshared);

     int pthread_barrierattr_getpshared(pthread_barrierattr_t *attr,
     int * pshared);

     int pthread_barrierattr_destroy(pthread_barrierattr_t *attr);

DESCRIPTION
     pthread_barrierattr_init() will initialize the barrier attribute object
     referenced by attr with default values.  By default an attribute object
     will be set to PTHREAD_PROCESS_PRIVATE.

     pthread_barrierattr_getpshared() will store the value of the process-
     shared attribute of the attribute object attr into pshared.
     pthread_barrierattr_setpshared() will set the process-shared attribute of
     the initialized attribute object attr to the value of pshared.

     The process-shared attribute should be set to PTHREAD_PROCESS_SHARED to
     allow any pthread to operate on a barrier initialized with the attribute
     object and that has access to the memory where the barrier is.  It should
     be set to PTHREAD_PROCESS_PRIVATE when only threads created within the
     same process will operate on the barrier.	The results of another process
     operating on a PTHREAD_PROCESS_PRIVATE barrier are undefined.

     pthread_barrierattr_destroy() will destroy the barrier attribute object
     referenced by attr.  The results of reusing the attribute after it has
     been destroyed are undefined.

     After a barrier attribute object has been used to initialize a barrier,
     the action of destroying the barrier attribute will not affect any
     initialized barrier.

DIAGNOSTICS
     On success these functions return zero; otherwise an error number is
     returned:

     pthread_barrierattr_setpshared() can return the following errors:

     [EINVAL]	    The value specified by attr is invalid.

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pthread_barrierattr_init(3P)			  pthread_barrierattr_init(3P)

     [EINVAL]	    The new process-shared value is not one of
		    PTHREAD_PROCESS_PRIVATE or PTHREAD_PROCESS_SHARED.

     pthread_barrierattr_getpshared() can return the following errors:

     [EINVAL]	    The value specified by attr is invalid.

     pthread_barrierattr_destroy() can return the following errors:

     [EINVAL]	    The value specified by attr is invalid.

SEE ALSO
     pthread_barrier_init(3P), pthread_barrier_wait(3P).

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