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.TH PTHREAD_RWLOCKATTR_GETPSHARED "3P" 2013 "IEEE/The Open Group" "POSIX Programmer's Manual"

.SH PROLOG

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.

.SH NAME

pthread_rwlockattr_getpshared,

pthread_rwlockattr_setpshared

\(em get and set the process-shared attribute of the read-write lock

attributes object

.SH SYNOPSIS

.LP

.nf

#include <pthread.h>

.P

int pthread_rwlockattr_getpshared(const pthread_rwlockattr_t

    *restrict \fIattr\fP, int *restrict \fIpshared\fP);

int pthread_rwlockattr_setpshared(pthread_rwlockattr_t *\fIattr\fP,

    int \fIpshared\fP);

.fi

.SH DESCRIPTION

The

\fIpthread_rwlockattr_getpshared\fR()

function shall obtain the value of the

.IR process-shared

attribute from the initialized attributes object referenced by

.IR attr .

The

\fIpthread_rwlockattr_setpshared\fR()

function shall set the

.IR process-shared

attribute in an initialized attributes object referenced by

.IR attr .

.P

The

.IR process-shared

attribute shall be set to PTHREAD_PROCESS_SHARED to

permit a read-write lock to be operated upon by any thread that has

access to the memory where the read-write lock is allocated, even if

the read-write lock is allocated in memory that is shared by multiple

processes. If the

.IR process-shared

attribute is PTHREAD_PROCESS_PRIVATE, the

read-write lock shall only be operated upon by threads created within

the same process as the thread that initialized the read-write lock; if

threads of differing processes attempt to operate on such a read-write

lock, the behavior is undefined. The default value of the

.IR process-shared

attribute shall be PTHREAD_PROCESS_PRIVATE.

.P

Additional attributes, their default values, and the names of the

associated functions to get and set those attribute values are

implementation-defined.

.P

The behavior is undefined if the value specified by the

.IR attr

argument to

\fIpthread_rwlockattr_getpshared\fR()

or

\fIpthread_rwlockattr_setpshared\fR()

does not refer to an initialized read-write lock attributes object.

.SH "RETURN VALUE"

Upon successful completion, the

\fIpthread_rwlockattr_getpshared\fR()

function shall return zero and store the value of the

.IR process-shared

attribute of

.IR attr

into the object referenced by the

.IR pshared

parameter. Otherwise, an error number shall be returned to indicate the

error.

.P

If successful, the

\fIpthread_rwlockattr_setpshared\fR()

function shall return zero; otherwise, an error number shall be

returned to indicate the error.

.SH ERRORS

The

\fIpthread_rwlockattr_setpshared\fR()

function may fail if:

.TP

.BR EINVAL

The new value specified for the attribute is outside the range of legal

values for that attribute.

.P

These functions shall not return an error code of

.BR [EINTR] .

.LP

.IR "The following sections are informative."

.SH EXAMPLES

None.

.SH "APPLICATION USAGE"

None.

.SH RATIONALE

None.

.SH "FUTURE DIRECTIONS"

None.

.SH "SEE ALSO"

.IR "\fIpthread_rwlock_destroy\fR\^(\|)",

.IR "\fIpthread_rwlockattr_destroy\fR\^(\|)"

.P

The Base Definitions volume of POSIX.1\(hy2008,

.IR "\fB<pthread.h>\fP"

.SH COPYRIGHT

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

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 .