Section: POSIX Programmer's Manual (3P)
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.
--- get and set the process-shared attribute
int pthread_mutexattr_getpshared(const pthread_mutexattr_t
*restrict attr, int *restrict pshared);
int pthread_mutexattr_setpshared(pthread_mutexattr_t *attr,
function shall obtain the value of the
attribute from the attributes object referenced by
function shall set the
attribute in an initialized attributes object referenced by
attribute is set to PTHREAD_PROCESS_SHARED to permit a mutex
to be operated upon by any thread that has access to the memory where
the mutex is allocated, even if the mutex is allocated in memory that
is shared by multiple processes. If the
attribute is PTHREAD_PROCESS_PRIVATE, the mutex shall only be operated
upon by threads created within the same process as the thread that
initialized the mutex; if threads of differing processes attempt to
operate on such a mutex, the behavior is undefined. The default value
of the attribute shall be PTHREAD_PROCESS_PRIVATE.
The behavior is undefined if the value specified by the
does not refer to an initialized mutex attributes object.
Upon successful completion,
shall return zero; otherwise, an error number shall be returned to
indicate the error.
Upon successful completion,
shall return zero and store the value of the
into the object referenced by the
parameter. Otherwise, an error number shall be returned to indicate
function may fail if:
The new value specified for the attribute is outside the range of legal
values for that attribute.
These functions shall not return an error code of
The following sections are informative.
If an implementation detects that the value specified by the
does not refer to an initialized mutex attributes object, it is
recommended that the function should fail and report an
The Base Definitions volume of POSIX.1-2008,
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
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