PTHREAD_BARRIERATTR_GETPSHARED(P) POSIX Programmer's Manual PTHREAD_BARRIERATTR_GETPSHARED(P)
pthread_barrierattr_getpshared, pthread_barrierattr_setpshared - get and set the
process-shared attribute of the barrier attributes object (ADVANCED REALTIME THREADS)
int pthread_barrierattr_getpshared(const pthread_barrierattr_t *
restrict attr, int *restrict pshared);
int pthread_barrierattr_setpshared(pthread_barrierattr_t *attr,
The pthread_barrierattr_getpshared() function shall obtain the value of the process-shared
attribute from the attributes object referenced by attr. The pthread_barrierattr_setp-
shared() function shall set the process-shared attribute in an initialized attributes
object referenced 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_PRI-
VATE. 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 implementation-defined.
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.
These functions may fail if:
EINVAL The value specified by attr is invalid.
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.
The pthread_barrierattr_getpshared() and pthread_barrierattr_setpshared() functions are
part of the Barriers option and need not be provided on all implementations.
pthread_barrier_destroy() , pthread_barrierattr_destroy() , pthread_barrierattr_init() ,
the Base Definitions volume of IEEE Std 1003.1-2001, <pthread.h>
Portions of this text are reprinted and reproduced in electronic form from IEEE Std
1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating System
Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by
the Institute of Electrical and Electronics Engineers, Inc and The Open Group. 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 orig-
inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .
IEEE/The Open Group 2003 PTHREAD_BARRIERATTR_GETPSHARED(P)