PTHREAD_BARRIERATTR_GETPSHARED(3P) POSIX Programmer's Manual PTHREAD_BARRIERATTR_GETPSHARED(3P)
PROLOG
This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the correspond-
ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.
NAME
pthread_barrierattr_getpshared, pthread_barrierattr_setpshared -- get and set the process-shared attribute of the barrier attributes object
SYNOPSIS
#include <pthread.h>
int pthread_barrierattr_getpshared(const pthread_barrierattr_t
*restrict attr, int *restrict pshared);
int pthread_barrierattr_setpshared(pthread_barrierattr_t *attr,
int pshared);
DESCRIPTION
The pthread_barrierattr_getpshared() function shall obtain the value of the process-shared attribute from the attributes object referenced
by attr. The pthread_barrierattr_setpshared() function shall set the process-shared attribute in an initialized attributes object refer-
enced by attr.
The process-shared 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 process-shared 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 <pthread.h>.
Additional attributes, their default values, and the names of the associated functions to get and set those attribute values are implemen-
tation-defined.
The behavior is undefined if the value specified by the attr argument to pthread_barrierattr_getpshared() or pthread_barrierattr_setp-
shared() does not refer to an initialized barrier attributes object.
RETURN VALUE
If successful, the pthread_barrierattr_getpshared() function shall return zero and store the value of the process-shared attribute of attr
into the object referenced by the pshared parameter. Otherwise, an error number shall be returned to indicate the error.
If successful, the pthread_barrierattr_setpshared() function shall return zero; otherwise, an error number shall be returned to indicate
the error.
ERRORS
The pthread_barrierattr_setpshared() function may fail if:
EINVAL The new value specified for the process-shared attribute is not one of the legal values PTHREAD_PROCESS_SHARED or
PTHREAD_PROCESS_PRIVATE.
These functions shall not return an error code of [EINTR].
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
The pthread_barrierattr_getpshared() and pthread_barrierattr_setpshared() functions are part of the Thread Process-Shared Synchronization
option and need not be provided on all implementations.
RATIONALE
If an implementation detects that the value specified by the attr argument to pthread_barrierattr_getpshared() or pthread_barrierattr_setp-
shared() does not refer to an initialized barrier attributes object, it is recommended that the function should fail and report an [EINVAL]
error.
FUTURE DIRECTIONS
None.
SEE ALSO
pthread_barrier_destroy(), pthread_barrierattr_destroy()
The Base Definitions volume of POSIX.1-2008, <pthread.h>
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2013 Edition, Standard for Information Technol-
ogy -- 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 Stan-
dard is the referee document. The original Standard can be obtained online at http://www.unix.org/online.html .
Any typographical or formatting errors that appear in this page are most likely to have been introduced during the conversion of the source
files to man page format. To report such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html .
IEEE
/The Open Group 2013 PTHREAD_BARRIERATTR_GETPSHARED(3P)