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 .