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Man Pages


Manual Reference Pages  -  PTHREAD_BARRIER_DESTROY (3)

NAME

pthread_barrier_destroy, pthread_barrier_init, pthread_barrier_wait - destroy, initialize or wait on a barrier object

CONTENTS

Library
Synopsis
Description
Implementation Notes
Return Values
Errors
See Also
History

LIBRARY


.Lb libpthread

SYNOPSIS


.In pthread.h int pthread_barrier_destroy pthread_barrier_t *barrier int pthread_barrier_init pthread_barrier_t *barrier const pthread_barrierattr_t *attr unsigned count int pthread_barrier_wait pthread_barrier_t *barrier

DESCRIPTION

The pthread_barrier_init function will initialize barrier with attributes specified in attr, or if it is NULL, with default attributes. The number of threads that must call pthread_barrier_wait before any of the waiting threads can be released is specified by count. The pthread_barrier_destroy function will destroy barrier and release any resources that may have been allocated on its behalf.

The pthread_barrier_wait function will synchronize calling threads at barrier. The threads will be blocked from making further progress until a sufficient number of threads calls this function. The number of threads that must call it before any of them will be released is determined by the count argument to pthread_barrier_init. Once the threads have been released the barrier will be reset.

IMPLEMENTATION NOTES

In both
.Lb libkse and
.Lb libthr the PTHREAD_BARRIER_SERIAL_THREAD return value will always be returned by the last thread to reach the barrier.

RETURN VALUES

If successful, both pthread_barrier_destroy and pthread_barrier_init will return zero. Otherwise, an error number will be returned to indicate the error. If the call to pthread_barrier_wait is successful, all but one of the threads will return zero. That one thread will return PTHREAD_BARRIER_SERIAL_THREAD. Otherwise, an error number will be returned to indicate the error.

None of these functions will return EINTR.

ERRORS

The pthread_barrier_destroy function will fail if:
[EBUSY]
  An attempt was made to destroy barrier while it was in use.

The pthread_barrier_destroy and pthread_barrier_wait functions may fail if:
[EINVAL]
  The value specified by barrier is invalid.

The pthread_barrier_init function will fail if:
[EAGAIN]
  The system lacks resources, other than memory, to initialize barrier.
[EINVAL]
  The count argument is less than 1.
[ENOMEM]
  Insufficient memory to initialize barrier.

SEE ALSO

pthread_barrierattr(3)

HISTORY

The pthread_barrier_destroy, pthread_barrier_init and pthread_barrier_wait functions first appeared in
.Lb libkse in
.Fx 5.2 , and in
.Lb libthr in
.Fx 5.3 .
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