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1.7.3.pthread_barrier_wait() #
NAME
pthread_barrier_destroy, pthread_barrier_init, pthread_barrier_wait: destroy, initialize or wait on a barrier object
SYNOPSIS
#include <pthread.h>
- int pthread_barrier_init (pthread_barrier_t *barrier , const pthread_barrierattr *attr ,
- unsigned count );
- int pthread_barrier_destroy (pthread_barrier_t *barrier);
- int pthread_barrier_wait (pthread_barrier_t *barrier);
- typedef struct {
- …
- } pthread_barrier_t;
- typedef struct {
- …
- } pthread_barrierattr;
DESCRIPTION
A barrier is used to synchronize multiple threads at a specific point in the program. A typical application might be dividing up a data collection and assigning one thread to each part of the data. When all data is processed, all threads synchronize and the processed data can be passed on as a whole.
pthread_barrier_init() creates and initializes the barrier specified by the attributes, with the expected threads count, returning zero if successful.
pthread_barrier_destroy will destroy the barrier and release any resources. It returns zero if successful.
pthread_barrier_wait synchronizes count threads at the barrier, releasing them all when all have arrived. The final thread returns PTHREAD_BARRIER_SERIAL_THREAD.
ERRORS
- EINVAL
pthread_barrier_init():
- The named barrier is invalid or the count is less than or equal to zero
pthread_barrier_destroy(), pthread_barrier_wait():
The value specified is invalid.
EBUSY
pthread_barrier_destroy():
- The threads have not all called and continued from the barrier so it cannot be destroyed.