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(). Using these routines does not affect the current running thread.

 FUTURE DIRECTIONS

None.

 SEE ALSO

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

DERIVATION

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