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 condition variable attributes
int pthread_condattr_getpshared(const pthread_condattr_t *restrict attr,
int *restrict pshared);
int pthread_condattr_setpshared(pthread_condattr_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 condition variable to be operated upon by any thread that
has access to the memory where the condition variable is allocated,
even if the condition variable is allocated in memory that is shared by
multiple processes. If the
attribute is PTHREAD_PROCESS_PRIVATE, the condition variable
shall only be operated upon by threads created within the same process
as the thread that initialized the condition variable; if threads of
differing processes attempt to operate on such a condition variable,
the behavior is undefined. The default value of the attribute is
The behavior is undefined if the value specified by the
does not refer to an initialized condition variable attributes object.
If successful, the
function shall return zero; otherwise, an error number shall be
returned to indicate the error.
If successful, the
function 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 the
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 condition variable 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
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