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 .

IEEE/The Open Group                                   2003                          PTHREAD_CONDATTR_GETCLOCK(P)