PTHREAD_CONDATTR_DESTROY(3PPOSIX Programmer's ManuPTHREAD_CONDATTR_DESTROY(3P)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.
pthread_condattr_destroy, pthread_condattr_init — destroy and initial‐
ize the condition variable attributes object
int pthread_condattr_destroy(pthread_condattr_t *attr);
int pthread_condattr_init(pthread_condattr_t *attr);
The pthread_condattr_destroy() function shall destroy a condition vari‐
able attributes object; the object becomes, in effect, uninitialized.
An implementation may cause pthread_condattr_destroy() to set the
object referenced by attr to an invalid value. A destroyed attr
attributes object can be reinitialized using pthread_condattr_init();
the results of otherwise referencing the object after it has been
destroyed are undefined.
The pthread_condattr_init() function shall initialize a condition vari‐
able attributes object attr with the default value for all of the
attributes defined by the implementation.
Results are undefined if pthread_condattr_init() is called specifying
an already initialized attr attributes object.
After a condition variable attributes object has been used to initial‐
ize one or more condition variables, any function affecting the
attributes object (including destruction) shall not affect any previ‐
ously initialized condition variables.
This volume of POSIX.1‐2008 requires two attributes, the clock
attribute and the process-shared attribute.
Additional attributes, their default values, and the names of the asso‐
ciated functions to get and set those attribute values are implementa‐
The behavior is undefined if the value specified by the attr argument
to pthread_condattr_destroy() does not refer to an initialized condi‐
tion variable attributes object.
If successful, the pthread_condattr_destroy() and pthread_con‐
dattr_init() functions shall return zero; otherwise, an error number
shall be returned to indicate the error.
The pthread_condattr_init() function shall fail if:
ENOMEM Insufficient memory exists to initialize the condition variable
These functions shall not return an error code of [EINTR].
The following sections are informative.
A process-shared 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 attr argu‐
ment to pthread_condattr_destroy() does not refer to an initialized
condition variable attributes object, it is recommended that the func‐
tion should fail and report an [EINVAL] error.
See also pthread_attr_destroy() and pthread_mutex_destroy().
SEE ALSOpthread_attr_destroy(), pthread_cond_destroy(), pthread_condattr_getp‐
shared(), pthread_create(), pthread_mutex_destroy()
The Base Definitions volume of POSIX.1‐2008, <pthread.h>
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 Electri‐
cal 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 .
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