cxtpri.c

上传一个带源代码的嵌入式实时多任务操作系统CMX

/*********************************************************

Copyright (c) CMX Company. 1999. All rights reserved

*********************************************************/
/* version 5.30 */

#define CMXMODULE 1

#include <cxfuncs.h>	/* get cmx include header file */
#include <cxextern.h>	/* get cmx include header file */

#if (defined(CMXTRACKER) || defined(WINTRACKER))
#include <cmxtrack.h>	/* get cmx include header file */
#endif

/******************************************************
 This function will change the priority of a task, will possibly
 re-adjust the linked TCB chain.
******************************************************/
byte K_Task_Priority(byte tskid,byte new_priority)
{
	tcbpointer tcbptr;

	if(K_I_Get_Ptr(tskid,&tcbptr))	/* send address of pointer */
		{
#if (defined(CMXTRACKER) || defined(WINTRACKER))
		if (CMXTRACKER_ON)
			{
			cmxtracker_in2(CXTPRI_K_ERROR,tskid);
			}
#endif
		return(K_ERROR);
		}
	K_I_Disable_Sched();	/* set task block */
	K_I_Unlink(tcbptr);	/* take task out of priority chain */
	K_I_Priority_In(tcbptr,new_priority);	/* now insert the task back into the
													priority chain link list */
#if (defined(CMXTRACKER) || defined(WINTRACKER))
		if (CMXTRACKER_ON)
			{
			cmxtracker_in3(CXTPRI_K_OK,tskid,new_priority);
			}
#endif
	K_I_Func_Return();	/* release task block */
	return(K_OK);	/* return good status */
}