Section: POSIX Programmer's Manual (3P)
This manual page is part of the POSIX Programmer's Manual.
The Linux implementation of this interface may differ (consult
the corresponding Linux manual page for details of Linux behavior),
or the interface may not be implemented on Linux.
--- get and set the process-shared attribute of the barrier
int pthread_barrierattr_getpshared(const pthread_barrierattr_t
*restrict attr, int *restrict pshared);
int pthread_barrierattr_setpshared(pthread_barrierattr_t *attr,
function shall obtain the value of the
attribute from the attributes object referenced by
function shall set the
attribute in an initialized attributes object referenced by
attribute is set to PTHREAD_PROCESS_SHARED to
permit a barrier to be operated upon by any thread that has access to
the memory where the barrier is allocated. If the
attribute is PTHREAD_PROCESS_PRIVATE, the barrier shall only be
operated upon by
threads created within the same process as the thread that initialized
the barrier; if threads of different processes attempt to operate on
such a barrier, the behavior is undefined. The default value of the
attribute shall be PTHREAD_PROCESS_PRIVATE. Both constants
PTHREAD_PROCESS_SHARED and PTHREAD_PROCESS_PRIVATE are defined in
Additional attributes, their default values, and the names of the
associated functions to get and set those attribute values are
The behavior is undefined if the value specified by the
does not refer to an initialized barrier attributes object.
If successful, the
function shall return zero and store the value of the
into the object referenced by the
parameter. Otherwise, an error number shall be returned to indicate
If successful, the
function shall return zero; otherwise, an error number shall be
returned to indicate the error.
function may fail if:
The new value specified for the
attribute is not one of the legal values PTHREAD_PROCESS_SHARED
These functions shall not return an error code of
The following sections are informative.
functions are part of the Thread Process-Shared Synchronization
option and need not be provided on all implementations.
If an implementation detects that the value specified by the
does not refer to an initialized barrier attributes object, it is
recommended that the function should fail and report an
The Base Definitions volume of POSIX.1-2008,
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 7, Copyright (C) 2013 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group.
(This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) In the
event of any discrepancy between this version and the original IEEE and
The Open Group Standard, the original IEEE and The Open Group Standard
is the referee document. The original Standard can be obtained online at
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