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.
--- destroy and initialize the condition variable attributes object
int pthread_condattr_destroy(pthread_condattr_t *attr);
int pthread_condattr_init(pthread_condattr_t *attr);
function shall destroy a condition variable attributes object; the
object becomes, in effect, uninitialized. An implementation may cause
to set the object referenced by
to an invalid value. A destroyed
attributes object can be reinitialized using
the results of otherwise referencing the object after it
has been destroyed are undefined.
function shall initialize a condition variable attributes object
with the default value for all of the attributes defined by the
Results are undefined if
is called specifying an already initialized
After a condition variable attributes object has been used to
initialize one or more condition variables, any function affecting the
attributes object (including destruction) shall not affect any
previously initialized condition variables.
This volume of POSIX.1-2017 requires two attributes, the
attribute and the
Additional attributes, their default values, and the names of the
associated functions to get and set those attribute values are
The behavior is undefined if the value specified by the
does not refer to an initialized condition variable attributes object.
If successful, the
functions shall return zero; otherwise, an error number shall be
returned to indicate the error.
function shall fail if:
Insufficient memory exists to initialize the condition variable
These functions shall not return an error code of
The following sections are informative.
attribute has been defined for condition variables for the same reason
it has been defined for mutexes.
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.1-2017,
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1-2017, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 7, 2018 Edition,
Copyright (C) 2018 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
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