1PTHREAD_CONDATTR_DESTROY(3P)POSIX Programmer's ManuaPlTHREAD_CONDATTR_DESTROY(3P)
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PROLOG

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

13       pthread_condattr_destroy, pthread_condattr_init — destroy and  initial‐
14       ize the condition variable attributes object
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SYNOPSIS

17       #include <pthread.h>
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19       int pthread_condattr_destroy(pthread_condattr_t *attr);
20       int pthread_condattr_init(pthread_condattr_t *attr);
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DESCRIPTION

23       The pthread_condattr_destroy() function shall destroy a condition vari‐
24       able attributes object; the object becomes, in  effect,  uninitialized.
25       An  implementation  may  cause  pthread_condattr_destroy()  to  set the
26       object referenced by  attr  to  an  invalid  value.  A  destroyed  attr
27       attributes  object  can be reinitialized using pthread_condattr_init();
28       the results of otherwise referencing  the  object  after  it  has  been
29       destroyed are undefined.
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31       The pthread_condattr_init() function shall initialize a condition vari‐
32       able attributes object attr with the  default  value  for  all  of  the
33       attributes defined by the implementation.
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35       Results  are  undefined if pthread_condattr_init() is called specifying
36       an already initialized attr attributes object.
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38       After a condition variable attributes object has been used to  initial‐
39       ize  one  or  more  condition  variables,  any  function  affecting the
40       attributes object (including destruction) shall not affect  any  previ‐
41       ously initialized condition variables.
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43       This   volume  of  POSIX.1‐2008  requires  two  attributes,  the  clock
44       attribute and the process-shared attribute.
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46       Additional attributes, their default values, and the names of the asso‐
47       ciated  functions to get and set those attribute values are implementa‐
48       tion-defined.
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50       The behavior is undefined if the value specified by the  attr  argument
51       to  pthread_condattr_destroy()  does not refer to an initialized condi‐
52       tion variable attributes object.
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RETURN VALUE

55       If  successful,   the   pthread_condattr_destroy()   and   pthread_con‐
56       dattr_init()  functions  shall  return zero; otherwise, an error number
57       shall be returned to indicate the error.
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ERRORS

60       The pthread_condattr_init() function shall fail if:
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62       ENOMEM Insufficient memory exists to initialize the condition  variable
63              attributes object.
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65       These functions shall not return an error code of [EINTR].
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67       The following sections are informative.
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EXAMPLES

70       None.
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APPLICATION USAGE

73       None.
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RATIONALE

76       A process-shared attribute has been defined for condition variables for
77       the same reason it has been defined for mutexes.
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79       If an implementation detects that the value specified by the attr argu‐
80       ment  to  pthread_condattr_destroy()  does  not refer to an initialized
81       condition variable attributes object, it is recommended that the  func‐
82       tion should fail and report an [EINVAL] error.
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84       See also pthread_attr_destroy() and pthread_mutex_destroy().
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FUTURE DIRECTIONS

87       None.
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SEE ALSO

90       pthread_attr_destroy(), pthread_cond_destroy(), pthread_condattr_getp‐
91       shared(), pthread_create(), pthread_mutex_destroy()
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93       The Base Definitions volume of POSIX.1‐2008, <pthread.h>
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96       Portions of this text are reprinted and reproduced in  electronic  form
97       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
98       -- Portable Operating System Interface (POSIX),  The  Open  Group  Base
99       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
100       cal and Electronics Engineers,  Inc  and  The  Open  Group.   (This  is
101       POSIX.1-2008  with  the  2013  Technical Corrigendum 1 applied.) In the
102       event of any discrepancy between this version and the original IEEE and
103       The  Open Group Standard, the original IEEE and The Open Group Standard
104       is the referee document. The original Standard can be  obtained  online
105       at http://www.unix.org/online.html .
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107       Any  typographical  or  formatting  errors that appear in this page are
108       most likely to have been introduced during the conversion of the source
109       files  to  man page format. To report such errors, see https://www.ker‐
110       nel.org/doc/man-pages/reporting_bugs.html .
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114IEEE/The Open Group                  2013         PTHREAD_CONDATTR_DESTROY(3P)
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