NAME

pthread_attr_setinheritsched, pthread_attr_getinheritsched - set and get inheritsched attribute (REALTIME THREADS)

SYNOPSIS

#include <pthread.h>

int pthread_attr_setinheritsched(pthread_attr_t *attr,
    int inheritsched);
int pthread_attr_getinheritsched(const pthread_attr_t *attr, 
    int *inheritsched);

DESCRIPTION

The functions pthread_attr_setinheritsched() and pthread_attr_getinheritsched(), respectively, set and get the inheritsched attribute in the attr argument.

When the attribute objects are used by pthread_create(), the inheritsched attribute determines how the other scheduling attributes of the created thread are to be set:

PTHREAD_INHERIT_SCHED

Specifies that the scheduling policy and associated attributes are to be inherited from the creating thread, and the scheduling attributes in this attr argument are to be ignored.

PTHREAD_EXPLICIT_SCHED

Specifies that the scheduling policy and associated attributes are to be set to the corresponding values from this attribute object.

The symbols PTHREAD_INHERIT_SCHED and PTHREAD_EXPLICIT_SCHED are defined in the header <pthread.h>.

RETURN VALUE

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

ERRORS

The pthread_attr_setinheritsched() and pthread_attr_getinheritsched() 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_setinheritsched() 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_setscope(), pthread_attr_setschedpolicy(), pthread_attr_setschedparam(), pthread_create(), <pthread.h>, pthread_setschedparam(), <sched.h>.