man pthread_attr_getscope () - get and set the contentionscope attribute (REALTIME THREADS)
NAME
pthread_attr_getscope, pthread_attr_setscope - get and set the contentionscope attribute (REALTIME THREADS)
SYNOPSIS
#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].
The following sections are informative.
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() , pthread_attr_getschedparam() , pthread_create() , the Base Definitions volume of IEEE Std 1003.1-2001, <pthread.h>, <sched.h>
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html .