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Man Pages


Manual Reference Pages  -  PTHREAD_BARRIERATTR_SETPSHARED (3)

NAME

pthread_barrierattr_destroy, pthread_barrierattr_getpshared, pthread_barrierattr_init, pthread_barrierattr_setpshared - manipulate a barrier attribute object

CONTENTS

Library
Synopsis
Description
Return Values
Errors
See Also
History
Bugs

LIBRARY


.Lb libpthread

SYNOPSIS


.In pthread.h int pthread_barrierattr_destroy pthread_barrierattr_t *attr int pthread_barrierattr_getpshared const pthread_barrierattr_t *attr int *pshared int pthread_barrierattr_init pthread_barrierattr_t *attr int pthread_barrierattr_setpshared pthread_barrierattr_t *attr int pshared

DESCRIPTION

The pthread_barrierattr_init function will initialize attr with default attributes. The pthread_barrierattr_destroy function will destroy attr and release any resources that may have been allocated on its behalf.

The pthread_barrierattr_getpshared function will put the value of the process-shared attribute from attr into the memory area pointed to by pshared. The pthread_barrierattr_setpshared function will set the process-shared attribute of attr to the value specified in pshared. The argument pshared may have one of the following values:
PTHREAD_PROCESS_PRIVATE
  The barrier object it is attached to may only be accessed by threads in the same process as the one that created the object.
PTHREAD_PROCESS_SHARED The barrier object it is attached to may be accessed by threads in processes other than the one that created the object.

RETURN VALUES

If successful, all these functions will return zero. Otherwise, an error number will be returned to indicate the error.

None of these functions will return EINTR.

ERRORS

The pthread_barrierattr_destroy, pthread_barrierattr_getpshared and pthread_barrierattr_setpshared functions may fail if:
[EINVAL]
  The value specified by attr is invalid.

The pthread_barrierattr_init function will fail if:
[ENOMEM]
  Insufficient memory to initialize the barrier attribute object attr.

The pthread_barrierattr_setpshared function will fail if:
[EINVAL]
  The value specified in pshared is not one of the allowed values.

SEE ALSO

pthread_barrier_destroy(3), pthread_barrier_init(3), pthread_barrier_wait(3)

HISTORY

The pthread_barrierattr_* functions first appeared in
.Lb libkse in
.Fx 5.2 , and in
.Lb libthr in
.Fx 5.3 .

BUGS

The implementation of barriers does not fully conform to -p1003.2 because the process-shared attribute is ignored in
.Lb libthr , and in
.Lb libkse ; if any value other than PTHREAD_PROCESSES_PRIVATE is specified in a call to pthread_barrierattr_setpshared, it will return EINVAL.
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