Description

   This routine changes the inherit scheduling attribute of the
   thread attributes object specified by the attr argument. The
   inherit scheduling attribute specifies whether a thread created
   using the specified attributes object inherits the scheduling
   attributes of the creating thread, or uses the scheduling
   attributes stored in the attributes object specified by the
   pthread_create() attr argument.

   The first thread in an application has a scheduling policy of
   SCHED_OTHER. See the pthread_attr_setschedparam() and pthread_
   attr_setschedpolicy() routines for more information on valid
   priority values and valid scheduling policy values.

   Inheriting scheduling attributes (instead of using the scheduling
   attributes stored in the attributes object) is useful when a
   thread is creating several helper threads-that is, threads
   that are intended to work closely with the creating thread to
   cooperatively solve the same problem. For example, inherited
   scheduling attributes ensure that helper threads created in
   a sort routine execute with the same priority as the calling
   thread.