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.
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.
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