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PROLOG | NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLES | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT |
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PTHREAD...GETCLOCK(3P) POSIX Programmer's Manual PTHREAD...GETCLOCK(3P)
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.
pthread_condattr_getclock, pthread_condattr_setclock — get and set
the clock selection condition variable attribute
#include <pthread.h>
int pthread_condattr_getclock(const pthread_condattr_t *restrict attr,
clockid_t *restrict clock_id);
int pthread_condattr_setclock(pthread_condattr_t *attr,
clockid_t clock_id);
The pthread_condattr_getclock() function shall obtain the value of
the clock attribute from the attributes object referenced by attr.
The pthread_condattr_setclock() function shall set the clock
attribute in an initialized attributes object referenced by attr.
If pthread_condattr_setclock() is called with a clock_id argument
that refers to a CPU-time clock, the call shall fail.
The clock attribute is the clock ID of the clock that shall be
used to measure the timeout service of pthread_cond_timedwait().
The default value of the clock attribute shall refer to the system
clock.
The behavior is undefined if the value specified by the attr
argument to pthread_condattr_getclock() or
pthread_condattr_setclock() does not refer to an initialized
condition variable attributes object.
If successful, the pthread_condattr_getclock() function shall
return zero and store the value of the clock attribute of attr
into the object referenced by the clock_id argument. Otherwise, an
error number shall be returned to indicate the error.
If successful, the pthread_condattr_setclock() function shall
return zero; otherwise, an error number shall be returned to
indicate the error.
The pthread_condattr_setclock() function may fail if:
EINVAL The value specified by clock_id does not refer to a known
clock, or is a CPU-time clock.
These functions shall not return an error code of [EINTR].
The following sections are informative.
None.
None.
If an implementation detects that the value specified by the attr
argument to pthread_condattr_getclock() or
pthread_condattr_setclock() does not refer to an initialized
condition variable attributes object, it is recommended that the
function should fail and report an [EINVAL] error.
None.
pthread_cond_destroy(3p), pthread_cond_timedwait(3p),
pthread_condattr_destroy(3p), pthread_condattr_getpshared(3p),
pthread_create(3p), pthread_mutex_destroy(3p)
The Base Definitions volume of POSIX.1‐2017, pthread.h(0p)
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...GETCLOCK(3P)
Pages that refer to this page: pthread.h(0p), pthread_condattr_setclock(3p)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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