setting thread priorities Post: 96011

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thr_getprio

thr_getprio(3C) 					   Standard C Library Functions 					   thr_getprio(3C)

NAME

       thr_getprio, thr_setprio - access dynamic thread scheduling

SYNOPSIS

       cc -mt [ flag... ] file...[ library... ]

       #include <thread.h>

       int thr_setprio(thread_t target_thread, int priority);

       int thr_getprio(thread_t target_thread, int *priority);

DESCRIPTION

       The thr_setprio() function dynamically changes the priority of the thread specified by target_thread within the current process to the pri-
       ority specified by priority. By default, threads  contend for synchronization objects  based on	fixed priorities that range  from  0,  the
       least  significant,  to	 127.  The target_thread will receive precedence by libthread over lower priority threads with respect to synchro-
       nization object contention.

       The thr_getprio() function stores the current priority for the thread specified by target_thread in the location pointed  to  by  priority.
       Thread  priorities  regulate  the  order  in which threads unblock from synchronization objects and are different from realtime priorities,
       which regulate and enforce  access  to CPU  resources.  Programs that need access to "real" priorities should  use  bound  threads  in  the
       realtime class  (see priocntl(2)).

RETURN VALUES

       If successful, the thr_getprio() and thr_setprio() return 0. Otherwise, an error number is returned to indicate the error.

ERRORS

       For each of the following conditions, these functions return  an error number if the condition is detected.

       ESRCH	       The value specified by target_thread does not refer to an existing thread.

       The  thr_getprio() and  thr_setprio() functions may fail if:

       EINVAL	       The value of priority makes no sense for the scheduling class associated with the target_thread.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       priocntl(2), sched_setparam(3RT), thr_create(3C), thr_suspend(3C), thr_yield(3C), attributes(5), standards(5)

SunOS 5.10							    22 Mar 2001 						   thr_getprio(3C)