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].

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.