priority.c

嵌入式系统基础课件

#include "priority.h"

extern void ChangePriority(int thread, int priority) ;

/* ---------------------------------------------------- */
/* Use the #defines in the above header file and the	*/
/* externally-defined functions to modify one or more	*/
/* of the four functions defined in this file in order	*/
/* to implement:					*/
/* 							*/
/* (1) The Priority Ceiling Protocol, and		*/
/* (2) The Priority Inheritance Protocol.		*/
/* ---------------------------------------------------- */

void LoPriThreadPend(void)
	{
	SemaphorePend(TSK_LOW) ;
	}

void LoPriThreadPost(void)
	{
	SemaphorePost(TSK_LOW) ;
	}

void HiPriThreadPend(void)
	{
	SemaphorePend(TSK_HI) ;
	}

void HiPriThreadPost(void)
	{
	SemaphorePost(TSK_HI) ;
	}