pthread_attr_setprio man page on Ultrix

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pthread_attr_setprio(3thr)			    pthread_attr_setprio(3thr)

Name
       pthread_attr_setprio  -	Changes	 the  scheduling priority attribute of
       thread creation.

Syntax
       #include <pthread.h>

       int pthread_attr_setprio (attr, priority)
       pthread_attr_t *attr;
       int priority;

Arguments
       attr    Thread attributes object modified.

       priority
	       New value for the priority attribute. The priority 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

	      The default priority is the midpoint between  PRI_OTHER_MIN  and
	      PRI_OTHER_MAX.  (<REFERENCE>(sched_sec) describes how to specify
	      priorities between the minimum and maximum values.)

Description
       This routine sets the execution priority of threads  that  are  created
       using the attributes object specified by the attr argument.

       By  default, a created thread inherits the priority of the thread call‐
       ing pthread_create. To specify a priority using this routine,  schedul‐
       ing  inheritance	 must  be  disabled at the time the thread is created.
       Call pthread_attr_setinheritsched and specify the  value	 DEFAULT_SCHED
       for  the	 inherit argument before calling this routine and pthread_cre‐
       ate.

       An application specifies	 priority only to express the urgency of  exe‐
       cuting  the  thread  relative to other threads. Priority is not used to
       control mutual exclusion when accessing shared data.  With a sufficient
       number of processors executing, all ready threads, regardless of prior‐
       ity, execute simultaneously.

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 attr is invalid.

       -1	[ERANGE]   One	or  more argu‐
			   ments supplied have
			   an invalid value.

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

						    pthread_attr_setprio(3thr)
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