stoptimer.c 1.5 KB

/**************************************************************************
 *									  *
 *		 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 *  unpublished  proprietary  information of Silicon Graphics, Inc., and  *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 <rmon.h>
#include "osint.h"
#include "viint.h"


/*
 * This routine stops the timer t.
 */
int
osStopTimer(OSTimer *t)
{
	register u32 savedMask;
	OSTimer      *timep;

#ifdef _DEBUG
	/* Check that VI manager is running */

	if (!__osViDevMgr.active) {
	    __osError(ERR_OSSTOPTIMER, 0);
	    return(0);
	}
#endif
	/* Make sure timer is on the list */

	if (t->next == NULL)
		return(-1);

	/* disable interrupts */
	
    	savedMask = __osDisableInt();

	/* 
	 * Remove timer from the running timer list and adjust
 	 * next timer in the list 
	 */

	timep = t->next;
	if (timep != __osTimerList)
		timep->value += t->value;
	t->prev->next = t->next;
	t->next->prev = t->prev;
	t->next = NULL;
	t->prev = NULL;

	/*
	 * If no timer left in the list, we need to clear interrupt */
	if (__osTimerList->next == __osTimerList)
		__osSetCompare(0);

	__osRestoreInt(savedMask);
	return(0);
}