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  scheduling  attributes are affected by the inherit-scheduler attribute: scheduling policy (pthread_attr_setschedpolicy(3)),
       scheduling priority (pthread_attr_setschedparam(3)), and contention scope (pthread_attr_setscope(3)).

       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.

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).

EXAMPLE

       See pthread_setschedparam(3).

SEE ALSO

       sched_setscheduler(2), pthread_attr_init(3), pthread_attr_setschedparam(3), pthread_attr_setschedpolicy(3), pthread_attr_setscope(3),
       pthread_create(3), pthread_setschedparam(3), pthread_setschedprio(3), pthreads(7)

COLOPHON

       This page is part of release 3.53 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								    2013-04-19					   PTHREAD_ATTR_SETINHERITSCHED(3)