pthread_setscheduler man page on Ultrix

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pthread_setscheduler(3thr)			    pthread_setscheduler(3thr)

Name
       pthread_setscheduler - Changes the current scheduling policy and prior‐
       ity of a thread.

Syntax
       #include <pthread.h>

       int pthread_setscheduler (thread, scheduler, priority)
       pthread_t thread;
       int scheduler;
       int priority;

Arguments
       thread  Thread whose scheduling policy is to be changed.

       scheduler
	       New scheduling policy value for the thread specified in thread.
	       (Policies listed on the same line are equivalent.) Valid values
	       are as follows:

		 SCHED_FIFO

		 SCHED_RR

		 SCHED_FG_NP or SCHED_OTHER

		 SCHED_BG_NP

       priority
	       New priority value of the thread specified in thread. The  pri‐
	       ority  attribute	 is  dependent	upon scheduling policy.	 Valid
	       values fall within one of the following three ranges.

	       Low		High
	       PRI_FIFO_MIN	 PRI_FIFO_MAX

	       PRI_RR_MIN	 PRI_RR_MAX

	       PRI_OTHER_MIN	 PRI_OTHER_MAX

	       PRI_FG_MIN_NP	 PRI_FG_MAX_NP

	       PRI_BG_MIN_NP	 PRI_BG_MAX_NP

       If you create a new thread  without  specifying	a  threads  attributes
       object that contains a changed priority attribute, the default priority
       of the newly created thread is the midpoint between  PRI_OTHER_MIN  and
       PRI_OTHER_MAX (the midpoint between the minimum and the maximum for the
       SCHED_OTHER policy).

Description
       This routine changes the current scheduling policy and  priority	 of  a
       thread.	Call  this  routine to change both the priority and scheduling
       policy of a thread at the same time.  To change only the priority, call
       the pthread_setprio routine.

       A  thread  changes  its own scheduling policy and priority by using the
       identifier returned by pthread_self.  Changing the scheduling policy or
       priority, or both, of a thread can cause it to start executing or to be
       preempted by another thread.

       This   routine	is    different	   from	   pthread_attr_setprio	   and
       pthread_attr_setsched  because  those  routines	set  the  priority and
       scheduling policy attributes that are used to  establish	 the  priority
       and  scheduling	policy	of a new thread when it is created.  This rou‐
       tine, however, changes the priority and scheduling policy of an	exist‐
       ing thread.

Return Values
       If an error condition occurs, this routine returns -1 and sets errno to
       the corresponding error value.  Possible return values are as follows.

       Return	Error	    Description
       0		    Successful	comple‐
			    tion.

       -1	[EINVAL]    The value specified
			    by	  thread     is
			    invalid.

       -1	[ENOTSUP]   An	attempt is made
			    to set  the	 policy
			    to	an  unsupported
			    value.

       -1	[ESRCH]	    The value specified
			    by	thread does not
			    refer to an	 exist‐
			    ing thread.

       -1	[EPERM]	    The caller does not
			    have the  appropri‐
			    ate	 privileges  to
			    set the priority of
			    the	      specified
			    thread.

						    pthread_setscheduler(3thr)
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