pthread_rwlockattr_getpshared (3p) - Linux Manuals
pthread_rwlockattr_getpshared: get
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.NAME
pthread_rwlockattr_getpshared, pthread_rwlockattr_setpshared - get and set the process-shared attribute of the read-write lock attributes object
SYNOPSIS
#include <pthread.h>
int pthread_rwlockattr_getpshared(const pthread_rwlockattr_t *
The pthread_rwlockattr_getpshared() function shall obtain the
value of the process-shared attribute from the
initialized attributes object referenced by attr. The pthread_rwlockattr_setpshared()
function shall set the
process-shared attribute in an initialized attributes object
referenced by attr.
The 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 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
process-shared attribute shall be PTHREAD_PROCESS_PRIVATE.
Additional attributes, their default values, and the names of the
associated functions to get and set those attribute values are
implementation-defined.
Upon successful completion, the pthread_rwlockattr_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_rwlockattr_setpshared() function
shall return zero; otherwise, an error number shall be
returned to indicate the error.
The pthread_rwlockattr_getpshared() and pthread_rwlockattr_setpshared()
functions may fail if:
The pthread_rwlockattr_setpshared() function may fail if:
These functions shall not return an error code of [EINTR].
The following sections are informative.
pthread_rwlock_destroy(), pthread_rwlockattr_destroy(),
pthread_rwlockattr_init(), the Base Definitions volume of
IEEE Std 1003.1-2001, <pthread.h>
int pthread_rwlockattr_setpshared(pthread_rwlockattr_t *attr,
DESCRIPTION
RETURN VALUE
ERRORS
EXAMPLES
APPLICATION USAGE
RATIONALE
FUTURE DIRECTIONS
COPYRIGHT
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 original Standard can be obtained online at
http://www.opengroup.org/unix/online.html .
SEE ALSO