1PTHREAD_CONDATTR_DESTROY(3P)POSIX Programmer's ManuaPlTHREAD_CONDATTR_DESTROY(3P)
2
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.
10
12 pthread_condattr_destroy, pthread_condattr_init - destroy and initial‐
13 ize the condition variable attributes object
14
16 #include <pthread.h>
17 int pthread_condattr_destroy(pthread_condattr_t *attr);
19 int pthread_condattr_init(pthread_condattr_t *attr);
20
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.
30 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.
34 Results are undefined if pthread_condattr_init() is called specifying
36 an already initialized attr attributes object.
37 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.
42 This volume of IEEE Std 1003.1-2001 requires two attributes, the clock
44 attribute and the process-shared attribute.
45 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.
49
51 If successful, the pthread_condattr_destroy() and pthread_con‐
52 dattr_init() functions shall return zero; otherwise, an error number
53 shall be returned to indicate the error.
54
56 The pthread_condattr_destroy() function may fail if:
57 EINVAL The value specified by attr is invalid.
59 The pthread_condattr_init() function shall fail if:
62 ENOMEM Insufficient memory exists to initialize the condition variable
64 attributes object.
65 These functions shall not return an error code of [EINTR].
68 The following sections are informative.
70
72 None.
73
75 None.
76
78 See pthread_attr_init() and pthread_mutex_init().
79 A process-shared attribute has been defined for condition variables for
81 the same reason it has been defined for mutexes.
82
84 None.
85
87 pthread_attr_destroy(), pthread_cond_destroy(), pthread_condattr_getp‐
88 shared(), pthread_create(), pthread_mutex_destroy(), the Base Defini‐
89 tions volume of IEEE Std 1003.1-2001, <pthread.h>
90
92 Portions of this text are reprinted and reproduced in electronic form
93 from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
94 -- Portable Operating System Interface (POSIX), The Open Group Base
95 Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
96 Electrical and Electronics Engineers, Inc and The Open Group. In the
97 event of any discrepancy between this version and the original IEEE and
98 The Open Group Standard, the original IEEE and The Open Group Standard
99 is the referee document. The original Standard can be obtained online
100 at http://www.opengroup.org/unix/online.html .
101IEEE/The Open Group 2003 PTHREAD_CONDATTR_DESTROY(3P)