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PTHREAD_CONDATTR_GETCLOCK(3POSIX Programmer's ManPTHREAD_CONDATTR_GETCLOCK(3P)

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 (ADVANCED REALTIME)

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_con‐
       dattr_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.

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
       These functions may fail if:

       EINVAL The value specified by attr is invalid.

       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
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       pthread_cond_destroy(),	   pthread_cond_timedwait(),	  pthread_con‐
       dattr_destroy(),	      pthread_condattr_getpshared(),	  pthread_con‐
       dattr_init(),	 pthread_condattr_setpshared(),	     pthread_create(),
       pthread_mutex_init(),	 the	 Base	  Definitions	  volume    of
       IEEE Std 1003.1-2001, <pthread.h>

COPYRIGHT
       Portions of this text are reprinted and reproduced in  electronic  form
       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
       -- Portable Operating System Interface (POSIX),	The  Open  Group  Base
       Specifications  Issue  6,  Copyright  (C) 2001-2003 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 .

IEEE/The Open Group		     2003	 PTHREAD_CONDATTR_GETCLOCK(3P)
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