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_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.

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_condattr_destroy()   ,
       pthread_condattr_getpshared()  ,1  pthread_condattr_init() , pthread_condattr_setpshared()
       ,1  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 .