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_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-
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
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
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 pro-
vided 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 Technol-
ogy -- 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 original Standard can be obtained
online at http://www.opengroup.org/unix/online.html .
/The Open Group 2003 PTHREAD_BARRIERATTR_GETPSHARED(P)