pthread_condattr_destroy(3p) — Linux manual page



PROLOG         top

       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.

NAME         top

       pthread_condattr_destroy, pthread_condattr_init — destroy and
       initialize the condition variable attributes object

SYNOPSIS         top

       #include <pthread.h>

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

DESCRIPTION         top

       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.1‐2008 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

       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         top

       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         top

       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         top




RATIONALE         top

       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(3p) and pthread_mutex_destroy(3p).



SEE ALSO         top

       pthread_attr_destroy(3p), pthread_cond_destroy(3p),
       pthread_condattr_getpshared(3p), pthread_create(3p),

       The Base Definitions volume of POSIX.1‐2008, pthread.h(0p)

COPYRIGHT         top

       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 .

IEEE/The Open Group                 2013        PTHREAD_CONDATTR_DESTROY(3P)

Pages that refer to this page: pthread.h(0p)pthread_condattr_getclock(3p)pthread_condattr_getpshared(3p)pthread_condattr_init(3p)