Professional Multicore Programming: Design and Implementation for C++ Developers

Name

NAME

pthread_attr_getscope, pthread_attr_setscope — get and set the contentionship attribute (REALTIME THREADS)

SYNOPSIS

THR TPS #include <pthread.h>

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

DESCRIPTION

The pthread_attr_getscope() and pthread_attr_setscope() functions, respectively, shall get and set 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 in the <pthread.h> header.

RETURN VALUE

If successful, the pthread_attr_getscope() and pthread_attr_setscope() functions shall return zero; otherwise, an error number shall be returned to indicate the error.

ERRORS

The pthread_attr_setscope() function may fail if:

[EINVAL]	The value of contentionscope is not valid.
[ENOTSUP]	An attempt was made to set the attribute to an unsupported value.

These functions shall not return an error code of [EINTR].

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.

RATIONALE

None.

FUTURE DIRECTIONS

None.

SEE ALSO

pthread_attr_destroy(), pthread_attr_getinheritsched(), pthread_attr_getschedpolicy ...