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(const 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 also documents an optional ENOTSUP error ("attempt was made to set the attribute to an unsupported  value")  for  pthread_attr_set-
       inheritsched().

ATTRIBUTES

       For an explanation of the terms used in this section, see attributes(7).

       +--------------------------------+---------------+---------+
       |Interface			| Attribute	| Value   |
       +--------------------------------+---------------+---------+
       |pthread_attr_setinheritsched(), | Thread safety | MT-Safe |
       |pthread_attr_getinheritsched()	|		|	  |
       +--------------------------------+---------------+---------+
CONFORMING TO

       POSIX.1-2001, POSIX.1-2008.

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

       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), sched(7)

COLOPHON

       This page is part of release 4.15 of the Linux man-pages project.  A description of the project, information about reporting bugs, and the
       latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.

Linux								    2017-09-15					   PTHREAD_ATTR_SETINHERITSCHED(3)