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kernel: make fixedpri work.

Fix and document the "fixedpri" control.

--- a/sys/man/3/proc

+++ b/sys/man/3/proc

@@ -355,6 +355,14 @@

 Set the base priority for the process to the integer

 .IR n .

 .TP 10n

+.B "fixedpri\ \fIn

+Fixate the process priority to the integer

+.IR n .

+In contrast to

+.BR pri ,

+the kernel will not automatically lower the priority

+based on the processes cpu usage.

+.TP 10n

 .B "wired\ \fIn

 Wire the process to processor

 .IR n .

--- a/sys/src/9/port/edf.c

+++ b/sys/src/9/port/edf.c

@@ -531,9 +531,8 @@

 				 * best effort

 				 */

 				DPRINT(">");

-				p->basepri = PriExtra;

-				p->fixedpri = 1;

 				edfunlock();

+				procpriority(p, PriExtra, 1);

 				return 0;	/* Stick on runq[PriExtra] */

 			}

 			DPRINT("%lud edfready %lud[%s] wait release at %lud\n",

--- a/sys/src/9/port/proc.c

+++ b/sys/src/9/port/proc.c

@@ -351,6 +351,9 @@

 	updatecpu(p);

+	if(p->fixedpri)

+		return p->basepri;

+

 	load = MACHP(0)->load;

 	if(load == 0)

 		return p->basepri;

-- 

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