cxtcre.c

CMEX source code RTOS for atmel atmega128

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

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 */

#ifdef CMXTRACKER
#include <cmxtrack.h>	/* get cmx include header file */
#endif

/***********************************************************************
	This function will create a task. The task will be defined to the 
	task's control block array.
************************************************************************/

byte K_Task_Create(byte priority,byte *tskid,CMX_FP task_addr,word16 stack_size,word16 system_stack_size)
{
	tcbpointer tcbptr;
	byte i;

	K_I_Disable_Sched();	/* set task block */
	tcbptr = cmx_tcb;	/* start at beginning of linked list. */
	for (i = 0; ;i++)
		{
		if (tcbptr->nxttcb)	/* not NULL */
			{
			if ((++tcbptr) > &cmx_tcb[MAX_TASKS])	/* past MAXIMUM? */
				{
#ifdef CMXTRACKER
		if (CMXTRACKER_ON)
			{
			cmxtracker_in1(CXTCRE_K_ERROR);
			}
#endif
				K_I_Func_Return();	/* yes, return because no more room. */
				return(K_ERROR);	/* return ERROR. */
				}
			}
		else
			{
			break;	/* OK, exit out of for loop. */
			}
		}
	K_I_Priority_In(tcbptr,priority);	/* go load in task into priority chain */
	*tskid = i;	/* load in slot number */

	tcbptr->task_addr = task_addr;	/* load in task's CODE address */

	CXTCRE_SPECIFIC();

	tcbptr->tcbstate = IDLE;	/* put the task into the IDLE state */
	tcbptr->trig = 0; /* load the start counter with 0, no starts */
#ifdef CMXTRACKER
		if (CMXTRACKER_ON)
			{
			cmxtracker_in1(CXTCRE_K_OK);
			}
#endif
	K_I_Func_Return();	/* release task block */
	return(K_OK);	/* return good status */
}