PROLOG

       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

       pthread_condattr_getclock,  pthread_condattr_setclock  —  get  and set the clock selection
       condition variable attribute

SYNOPSIS

       #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);

DESCRIPTION

       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.

RETURN VALUE

       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.

ERRORS

       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.

EXAMPLES

       None.

APPLICATION USAGE

       None.

RATIONALE

       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.

FUTURE DIRECTIONS

       None.

SEE ALSO

       pthread_cond_destroy(), pthread_cond_timedwait(), pthread_condattr_destroy(),
       pthread_condattr_getpshared(), pthread_create(), pthread_mutex_destroy()

       The Base Definitions volume of POSIX.1‐2008, <pthread.h>

COPYRIGHT

       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 http://www.unix.org/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 .