cxtwak.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

/************************************************************
 The following function will be called by both the K_Task_Wake and
 K_Task_Wake_Force functions. This will determine whether a task will
 be forced to wake up, or to normally be woken up.
************************************************************/
byte K_I_Wake_Common(byte tskid,byte force)
{
	tcbpointer tcbptr;

	if(K_I_Get_Ptr(tskid,&tcbptr))	/* send address of pointer */
		{
#if (defined(CMXTRACKER) || defined(WINTRACKER))
		if (CMXTRACKER_ON)
			{
			cmxtracker_in2(CXTWAK_K_ERROR,tskid);
			}
#endif
		return(K_ERROR);
		}
	K_I_Disable_Sched();	/* set task block */

	/* if force non 0, then wake task, regardless of what it
		was waiting for. If force = 0, then only wake task
		if it was waiting on time or indefinitely. */
	if (tcbptr->tcbstate & (force ? ANY_WAIT : WAIT))
		{
		/* see if task was waiting for a resource */
		if (tcbptr->tcbstate & (RESOURCE | SEMAPHORE))
			{
			/* yes, remove task from resource wait linked list. */
			tcbptr->fwlink->bwlink = tcbptr->bwlink;
			tcbptr->bwlink->fwlink = tcbptr->fwlink;
			}
		/* put task into the RESUME state, also possibly indicate time
			expired, though it may not in the true sense */
		if (force)
			tcbptr->tcbstate = RESUME | TIME_EXPIRED;
		else
			tcbptr->tcbstate = RESUME;

		/* see if this task has a higher priority then the current RUNNING task */
		if (tcbptr->priority < active_priority)
			{
			PREEMPTED;	/* yes, set the preempted scheduling flag */
			}
#if (defined(CMXTRACKER) || defined(WINTRACKER))
		if (CMXTRACKER_ON)
			{
			cmxtracker_in2(CXTWAK_K_OK,tskid);
			}
#endif
		K_I_Func_Return();	/* release task block */
		return(K_OK);	/* return good status */
		}
	else
		{
#if (defined(CMXTRACKER) || defined(WINTRACKER))
		if (CMXTRACKER_ON)
			{
			cmxtracker_in1(CXTWAK_K_NOT_WAITING);
			}
#endif
		K_I_Func_Return();	/* release task block */
		return(K_NOT_WAITING);	/* return error that task was not waiting */
		}
}