1PTHREAD_CONDATTR_GETCLOCK(3PP)OSIX Programmer's ManuPaTlHREAD_CONDATTR_GETCLOCK(3P)
2
3
4
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_getclock, pthread_condattr_setclock — get and set the
13 clock selection condition variable attribute
14
16 #include <pthread.h>
17
18 int pthread_condattr_getclock(const pthread_condattr_t *restrict attr,
19 clockid_t *restrict clock_id);
20 int pthread_condattr_setclock(pthread_condattr_t *attr,
21 clockid_t clock_id);
22
24 The pthread_condattr_getclock() function shall obtain the value of the
25 clock attribute from the attributes object referenced by attr.
26
27 The pthread_condattr_setclock() function shall set the clock attribute
28 in an initialized attributes object referenced by attr. If
29 pthread_condattr_setclock() is called with a clock_id argument that
30 refers to a CPU-time clock, the call shall fail.
31
32 The clock attribute is the clock ID of the clock that shall be used to
33 measure the timeout service of pthread_cond_timedwait(). The default
34 value of the clock attribute shall refer to the system clock.
35
36 The behavior is undefined if the value specified by the attr argument
37 to pthread_condattr_getclock() or pthread_condattr_setclock() does not
38 refer to an initialized condition variable attributes object.
39
41 If successful, the pthread_condattr_getclock() function shall return
42 zero and store the value of the clock attribute of attr into the object
43 referenced by the clock_id argument. Otherwise, an error number shall
44 be returned to indicate the error.
45
46 If successful, the pthread_condattr_setclock() function shall return
47 zero; otherwise, an error number shall be returned to indicate the
48 error.
49
51 The pthread_condattr_setclock() function may fail if:
52
53 EINVAL The value specified by clock_id does not refer to a known clock,
54 or is a CPU-time clock.
55
56 These functions shall not return an error code of [EINTR].
57
58 The following sections are informative.
59
61 None.
62
64 None.
65
67 If an implementation detects that the value specified by the attr argu‐
68 ment to pthread_condattr_getclock() or pthread_condattr_setclock() does
69 not refer to an initialized condition variable attributes object, it is
70 recommended that the function should fail and report an [EINVAL] error.
71
73 None.
74
76 pthread_cond_destroy(), pthread_cond_timedwait(), pthread_con‐
77 dattr_destroy(), pthread_condattr_getpshared(), pthread_create(),
78 pthread_mutex_destroy()
79
80 The Base Definitions volume of POSIX.1‐2017, <pthread.h>
81
83 Portions of this text are reprinted and reproduced in electronic form
84 from IEEE Std 1003.1-2017, Standard for Information Technology -- Por‐
85 table Operating System Interface (POSIX), The Open Group Base Specifi‐
86 cations Issue 7, 2018 Edition, Copyright (C) 2018 by the Institute of
87 Electrical and Electronics Engineers, Inc and The Open Group. In the
88 event of any discrepancy between this version and the original IEEE and
89 The Open Group Standard, the original IEEE and The Open Group Standard
90 is the referee document. The original Standard can be obtained online
91 at http://www.opengroup.org/unix/online.html .
92
93 Any typographical or formatting errors that appear in this page are
94 most likely to have been introduced during the conversion of the source
95 files to man page format. To report such errors, see https://www.ker‐
96 nel.org/doc/man-pages/reporting_bugs.html .
97
98
99
100IEEE/The Open Group 2017 PTHREAD_CONDATTR_GETCLOCK(3P)