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 *restrictattr
, int *restrictcontentionscope
); int pthread_attr_setscope(pthread_attr_t *attr
, intcontentionscope
);
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 ...
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