NAME

pthread_attr_setscope pthread_attr_getscope — set and get contentionscope attribute (REALTIME THREADS)

SYNOPSIS

#include <pthread.h>

int pthread_attr_setscope(pthread_attr_t *attr, int contentionscope);
int pthread_attr_getscope(const pthread_attr_t *attr,
    int *contentionscope);

DESCRIPTION

The pthread_attr_setscope() and pthread_attr_getscope() functions are used to set and get the contentionscope attribute in the attr object.

The contentionscope attribute may have the values PTHREAD_SCOPE_SYSTEM, signifying system scheduling contention scope, or PTHREAD_SCOPE_PROCESS, signifying process scheduling contention scope. The symbols PTHREAD_SCOPE_SYSTEM and PTHREAD_SCOPE_PROCESS are defined by the header <pthread.h>.

RETURN VALUE

If successful, the pthread_attr_setscope() and pthread_attr_getscope() functions return zero. Otherwise, an error number is returned to indicate the error.

ERRORS

The pthread_attr_setscope() and pthread_attr_getscope() functions will fail if:

[ENOSYS]

The option _POSIX_THREAD_PRIORITY_SCHEDULING is not defined and the implementation does not support the function.

The pthread_attr_setscope(), function may fail if:

[EINVAL]

The value of the attribute being set is not valid.

[ENOTSUP]

An attempt was made to set the attribute to an unsupported value.

EXAMPLES

None.

APPLICATION USAGE

After these attributes have been set, a thread can be created with the specified attributes using pthread_create(3) . Using these routines does not affect the current running thread.

FUTURE DIRECTIONS

None.

SEE ALSO

pthread_attr_init(3) , pthread_attr_setinheritsched(3) , pthread_attr_setschedpolicy(3) , pthread_attr_setschedparam(3) , pthread_create(3) , <pthread.h> , pthread_setschedparam(3) , <sched.h> .

DERIVATION

Derived from the POSIX Threads Extension (1003.1c-1995)