PTHREAD_CONDATTR_DESTROY(3)POSIX Programmer's ManualPTHREAD_CONDATTR_DESTROY(3)



PROLOG
       This manual page is part of the POSIX Programmer's Manual.  The OS
       implementation of this interface may differ (consult the corresponding
       OS manual page for details of OS behavior), or the interface may not be
       implemented on OS.

NAME
       pthread_condattr_destroy, pthread_condattr_init -- destroy and
       initialize the condition variable attributes object

SYNOPSIS
       #include <pthread.h>

       int pthread_condattr_destroy(pthread_condattr_t *attr);
       int pthread_condattr_init(pthread_condattr_t *attr);

DESCRIPTION
       The pthread__condattr__destroy() function shall destroy a condition
       variable 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
       variable 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
       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 clock
       attribute and the process-shared attribute.

       Additional attributes, their default values, and the names of the
       associated functions to get and set those attribute values are
       implementation-defined.

       The behavior is undefined if the value specified by the attr argument
       to pthread__condattr__destroy() does not refer to an initialized
       condition variable attributes object.

RETURN VALUE
       If successful, the pthread__condattr__destroy() and
       pthread__condattr__init() functions shall return zero; otherwise, an
       error number shall be returned to indicate the error.

ERRORS
       The pthread__condattr__init() function shall fail if:

       ENOMEM Insufficient memory exists to initialize the condition variable
              attributes object.

       These functions shall not return an error code of [EINTR].

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       None.

RATIONALE
       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
       argument to pthread__condattr__destroy() does not refer to an initialized
       condition variable attributes object, it is recommended that the
       function should fail and report an [EINVAL] error.

       See also pthread__attr__destroy() and pthread__mutex__destroy().

FUTURE DIRECTIONS
       None.

SEE ALSO
       pthread__attr__destroy(), pthread__cond__destroy(),
       pthread__condattr__getpshared(), pthread__create(),
       pthread__mutex__destroy()

       The Base Definitions volume of POSIX.1-2017, <pthread.h>

COPYRIGHT
       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 http://www.opengroup.org/unix/online.html .

       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
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .



IEEE/The Open Group                  2017          PTHREAD_CONDATTR_DESTROY(3)
