| PTHREAD_BARRIER(3) | Library Functions Manual | PTHREAD_BARRIER(3) | 
pthread_barrier,
  pthread_barrier_init,
  pthread_barrier_destroy,
  pthread_barrier_wait —
#include <pthread.h>
int
  
  pthread_barrier_init(pthread_barrier_t
    * restrict barrier, const
    pthread_barrierattr_t * restrict attr,
    unsigned int count);
int
  
  pthread_barrier_destroy(pthread_barrier_t
    *barrier);
int
  
  pthread_barrier_wait(pthread_barrier_t
    *barrier);
pthread_barrier_init() function creates a new
  barrier with attributes attr and
  count. The count parameter
  indicates the number of threads which will participate in the barrier. The
  pthread_barrierattr_init(3)
  function may be used to specify the attributes supplied in
  attr. If attr is
  NULL, the default attributes are used. Barriers are
  most commonly used in the decomposition of parallel loops.
The pthread_barrier_destroy() function
    causes the resources allocated to barrier to be
    released. No threads should be blocked on barrier.
The pthread_barrier_wait() function causes
    the current thread to wait on the barrier specified. Once as many threads as
    specified by the count parameter to the corresponding
    pthread_barrier_init() call have called
    pthread_barrier_wait(), all threads will wake up,
    return from their respective pthread_barrier_wait()
    calls and continue execution.
pthread_barrier_init() will return zero
  and put the new barrier id into barrier, otherwise an
  error number will be returned to indicate the error.
If successful, pthread_barrier_destroy()
    will return zero. Otherwise an error value will be returned.
If successful, pthread_barrier_wait() will
    return zero for all waiting threads except for one. One thread will receive
    status PTHREAD_BARRIER_SERIAL_THREAD, which is
    intended to indicate that this thread may be used to update shared data. It
    is the responsibility of this thread to insure the visibility and atomicity
    of any updates to shared data with respect to the other threads
    participating in the barrier. In the case of failure, an error value will be
    returned.
pthread_barrier_init() function may fail if:
EINVAL]The pthread_barrier_destroy() function may
    fail if:
EBUSY]EINVAL]The pthread_barrier_wait() function may
    fail if:
EINVAL]| October 22, 2017 | NetBSD 9.4 |