setthreadpri.c
1.94 KB
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/**************************************************************************
* *
* Copyright (C) 1994, Silicon Graphics, Inc. *
* *
* These coded instructions, statements, and computer programs contain *
* unpublished proprietary information of Silicon Graphics, Inc., and *
* are protected by Federal copyright law. They may not be disclosed *
* to third parties or copied or duplicated in any form, in whole or *
* in part, without the prior written consent of Silicon Graphics, Inc. *
* *
**************************************************************************/
#include "osint.h"
/*
* osSetThreadPri
*
* Set the given's thread priority to the given priority.
* If the given thread is NULL, set the priority of the running thread.
*/
void
osSetThreadPri(OSThread *t, OSPri p)
{
register u32 saveMask;
#ifdef _DEBUG
if ((p < OS_PRIORITY_IDLE) || (p > OS_PRIORITY_MAX)) {
__osError(ERR_OSSETTHREADPRI, 1, p);
return;
}
#endif
/*
* Lock out interrupts to prevent preemption after
* priority is set and during queue manipulation.
*/
saveMask = __osDisableInt();
if (t == (OSThread *)NULL) /* change own priority */
t = __osRunningThread;
/*
* If the thread priority is the same as before, do not change
* the order in any queue.
*/
if (t->priority != p) {
t->priority = p;
if ((t != __osRunningThread) &&
(t->state != OS_STATE_STOPPED)) {
/*
* Move the thread to its new priority level by
* dequeuing it and enqueuing it again.
*/
__osDequeueThread(t->queue, t);
__osEnqueueThread(t->queue, t);
}
/*
* If the change make this the highest priority runnable
* thread, yield the processor and invoke the dispatcher.
*/
if (__osRunningThread->priority < __osRunQueue->priority) {
__osRunningThread->state = OS_STATE_RUNNABLE;
__osEnqueueAndYield(&__osRunQueue);
}
}
/* Restore interrupts */
__osRestoreInt(saveMask);
}