NAME

pthread_barrier_init, pthread_barrier_destroy — initialize and destroy a barrier object

SYNOPSIS

#include <pthread.h>

int
pthread_barrier_init(pthread_barrier_t *barrier, pthread_barrierattr_t *attr, unsigned int count);

int
pthread_barrier_destroy(pthread_barrier_t *barrier);

DESCRIPTION

The pthread_barrier_init() function creates a new barrier object, with attributes specified with attr and with a threshold specified with count. If attr is NULL, the default attributes are used. The count argument is later used by the pthread_barrier_wait() function to check if the required number of threads reached the barrier.

The pthread_barrier_destroy() function frees the resources allocated for barrier.

RETURN VALUES

If successful, pthread_barrier_init() and pthread_barrier_destroy() return zero; otherwise an error number is returned to indicate the error.

ERRORS

pthread_barrier_init() will fail if:

[EINVAL]

The value specified by barrier or attr is invalid.

[ENOMEM]

The process cannot allocate enough memory to create another barrier object.

[ENOTSUP]

The attributes specified by attr are not supported by the current implementation.

pthread_barrier_destroy() will fail if:

[EINVAL]

The value specified by barrier is invalid.

[EBUSY]

There are still threads waiting on the barrier.

SEE ALSO

pthread_barrier_wait(3), pthread_barrierattr_getpshared(3), pthread_barrierattr_init(3)

STANDARDS

pthread_barrier_init() and pthread_barrier_destroy() conform to IEEE Std 1003.1-2008 (“POSIX.1”).

BUGS

Currently only private barriers are supported and the pshared attribute is always set that way. Any attempts to change that value will trigger ENOTSUP.