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.TH PTHREAD_BARRIERATTR_GETPSHARED 3C "Jan 30, 2004"
.SH NAME
pthread_barrierattr_getpshared, pthread_barrierattr_setpshared \- get and set
process-shared attribute of barrier attributes object
.SH SYNOPSIS
.LP
.nf
cc \fB-mt\fR [ \fIflag\fR... ] \fIfile\fR... [ \fIlibrary\fR... ]
#include <pthread.h>

\fBint\fR \fBpthread_barrierattr_getpshared\fR(
     \fBconst pthread_barrierattr_t *restrict\fR \fIattr\fR,
     \fBint *restrict\fR \fIpshared\fR);
.fi

.LP
.nf
\fBint\fR \fBpthread_barrierattr_setpshared\fR(\fBpthread_barrierattr_t *\fR\fIattr\fR,
     \fBint\fR \fIpshared\fR);
.fi

.SH DESCRIPTION
.sp
.LP
The \fBpthread_barrierattr_getpshared()\fR function obtains the value of the
\fIprocess-shared\fR attribute from the attributes object referenced by
\fIattr\fR. The \fBpthread_barrierattr_setpshared()\fR function sets the
\fIprocess-shared\fR attribute in an initialized attributes object referenced
by \fIattr\fR.
.sp
.LP
The \fIprocess-shared\fR attribute is set to \fBPTHREAD_PROCESS_SHARED\fR to
permit a barrier to be operated upon by any thread that has access to the
memory where the barrier is allocated. If the \fIprocess-shared\fR attribute is
\fBPTHREAD_PROCESS_PRIVATE\fR, the barrier will 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.
.sp
.LP
The default value of the attribute is \fBPTHREAD_PROCESS_PRIVATE\fR. Both
constants \fBPTHREAD_PROCESS_SHARED\fR and \fBPTHREAD_PROCESS_PRIVATE\fR are
defined in <\fBpthread.h\fR>.
.sp
.LP
No barrier attributes other than the \fIprocess-shared\fR attribute are
provided.
.SH RETURN VALUES
.sp
.LP
Upon successful completion, the \fBpthread_barrierattr_getpshared()\fR function
returns 0 and stores the value of the \fIprocess-shared\fR attribute of
\fIattr\fR into the object referenced by the \fIpshared\fR parameter.
Otherwise, an error number is returned to indicate the error.
.sp
.LP
Upon successful completion, the \fBpthread_barrierattr_setpshared()\fR function
returns 0. Otherwise, an error number is returned to indicate the error.
.SH ERRORS
.sp
.LP
These functions may fail if:
.sp
.ne 2
.na
\fB\fBEINVAL\fR\fR
.ad
.RS 10n
The value specified by \fIattr\fR is invalid.
.RE

.sp
.LP
The \fBpthread_barrierattr_setpshared()\fR function may fail if:
.sp
.ne 2
.na
\fB\fBEINVAL\fR\fR
.ad
.RS 10n
The new value specified for the \fIprocess-shared\fR attribute is not one of
the legal values \fBPTHREAD_PROCESS_SHARED\fR or \fBPTHREAD_PROCESS_PRIVATE\fR.
.RE

.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(5) for descriptions of the following attributes:
.sp

.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
Interface Stability	Standard
_
MT-Level	MT-Safe
.TE

.SH SEE ALSO
.sp
.LP
\fBpthread_barrier_init\fR(3C), \fBpthread_barrierattr_destroy\fR(3C),
\fBattributes\fR(5), \fBstandards\fR(5)