05-06-2008
init will inherit processC.
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LEARN ABOUT LINUX
pthread_attr_getinheritsched
PTHREAD_ATTR_SETINHERITSCHED(3) Linux Programmer's Manual PTHREAD_ATTR_SETINHERITSCHED(3)
NAME
pthread_attr_setinheritsched, pthread_attr_getinheritsched - set/get inherit scheduler attribute in thread attributes object
SYNOPSIS
#include <pthread.h>
int pthread_attr_setinheritsched(pthread_attr_t *attr,
int inheritsched);
int pthread_attr_getinheritsched(pthread_attr_t *attr,
int *inheritsched);
Compile and link with -pthread.
DESCRIPTION
The pthread_attr_setinheritsched() function sets the inherit scheduler attribute of the thread attributes object referred to by attr to the
value specified in inheritsched. The inherit scheduler attribute determines whether a thread created using the thread attributes object
attr will inherit its scheduling attributes from the calling thread or whether it will take them from attr.
The following values may be specified in inheritsched:
PTHREAD_INHERIT_SCHED
Threads that are created using attr inherit scheduling attributes from the creating thread; the scheduling attributes in attr are
ignored.
PTHREAD_EXPLICIT_SCHED
Threads that are created using attr take their scheduling attributes from the values specified by the attributes object.
The default setting of the inherit scheduler attribute in a newly initialized thread attributes object is PTHREAD_INHERIT_SCHED.
The pthread_attr_getinheritsched() returns the inherit scheduler attribute of the thread attributes object attr in the buffer pointed to by
inheritsched.
RETURN VALUE
On success, these functions return 0; on error, they return a nonzero error number.
ERRORS
pthread_attr_setinheritsched() can fail with the following error:
EINVAL Invalid value in inheritsched.
POSIX.1-2001 also documents an optional ENOTSUP error ("attempt was made to set the attribute to an unsupported value") for
pthread_attr_setinheritsched().
CONFORMING TO
POSIX.1-2001.
EXAMPLE
See pthread_setschedparam(3).
BUGS
As at glibc 2.8, if a thread attributes object is initialized using pthread_attr_init(3), then the scheduling policy of the attributes
object is set to SCHED_OTHER and the scheduling priority is set to 0. However, if the inherit scheduler attribute is then set to
PTHREAD_EXPLICIT_SCHED, then a thread created using the attribute object wrongly inherits its scheduling attributes from the creating
thread. This bug does not occur if either the scheduling policy or scheduling priority attribute is explicitly set in the thread
attributes object before calling pthread_create(3).
SEE ALSO
sched_setscheduler(2), pthread_attr_init(3), pthread_attr_setschedparam(3), pthread_attr_setschedpolicy(3), pthread_create(3),
pthread_setschedparam(3), pthread_setschedprio(3), pthreads(7)
COLOPHON
This page is part of release 3.27 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
Linux 2008-11-10 PTHREAD_ATTR_SETINHERITSCHED(3)