The Open Group Base Specifications Issue 6
IEEE Std 1003.1, 2004 Edition
Copyright © 2001-2004 The IEEE and The Open Group, All Rights reserved.

#### NAME

> pthread_condattr_getclock, pthread_condattr_setclock - get and set the clock selection condition variable attribute (ADVANCED REALTIME)

#### SYNOPSIS

> ``[THR CS] #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>

#### CHANGE HISTORY

> First released in Issue 6. Derived from IEEE Std 1003.1j-2000.

End of informative text.

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