NAME
pthread_attr_getinheritsched, pthread_attr_setinheritsched - get and
set the inheritsched attribute (REALTIME THREADS)
SYNOPSIS
#include <pthread.h>
int pthread_attr_getinheritsched(const pthread_attr_t *restrict attr,
int *restrict inheritsched);
int pthread_attr_setinheritsched(pthread_attr_t *attr,
int inheritsched);
DESCRIPTION
The pthread_attr_getinheritsched(), and pthread_attr_setinheritsched()
functions, respectively, shall get and set the inheritsched attribute
in the attr argument.
When the attributes objects are used by pthread_create(), the
inheritsched attribute determines how the other scheduling attributes
of the created thread shall be set.
PTHREAD_INHERIT_SCHED
Specifies that the thread scheduling attributes shall be
inherited from the creating thread, and the scheduling
attributes in this attr argument shall be ignored.
PTHREAD_EXPLICIT_SCHED
Specifies that the thread scheduling attributes shall be set to
the corresponding values from this attributes object.
The symbols PTHREAD_INHERIT_SCHED and PTHREAD_EXPLICIT_SCHED are
defined in the <pthread.h> header.
The following thread scheduling attributes defined by
IEEE Std 1003.1-2001 are affected by the inheritsched attribute:
scheduling policy ( schedpolicy), scheduling parameters ( schedparam),
and scheduling contention scope ( contentionscope).
RETURN VALUE
If successful, the pthread_attr_getinheritsched() and
pthread_attr_setinheritsched() functions shall return zero; otherwise,
an error number shall be returned to indicate the error.
ERRORS
The pthread_attr_setinheritsched() function may fail if:
EINVAL The value of inheritsched 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_getscope() ,
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 .