cxewatm.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 allows a task to wait for 1 or more events to be
 set, if they are not. Also a time period may be specified on how
 long the task will wait for at least 1 event to be set, in which
 the task wants.
MODE:
= 0 nothing
= 1 clear at beginning
= 2 auto clear on match
= 3 both 1 and 2
***************************************************************/
word16 K_Event_Wait(word16 match,word16 timecnt,byte mode)
{
	word16 good_bits;

	K_I_Disable_Sched();	/* set task block */
	if (mode & 0x01) 	/* see if we should clear specified events at beginning. */
		{
		activetcb->e_flags &= (~match); /* yes, clear them. */
		}
		/* see if ANY task flags match */
	if (!(activetcb->e_flags & (activetcb->e_match = match)))
		{
		/* NO, so call CMX function that will suspend task. */
#if (defined(CMXTRACKER) || defined(WINTRACKER))
		if (CMXTRACKER_ON)
			{
			cmxtracker_in4(CXEWATM_CALL,0,timecnt);
			}
#endif
		if (K_I_Time_Common(timecnt,FLAGS))	
			{
#if (defined(CMXTRACKER) || defined(WINTRACKER))
		if (CMXTRACKER_ON)
			{
			cmxtracker_in1(CXEWATM_DELAY_K_TIMEOUT);
			}
#endif
			return(0);	/* return the warning: that the time period expired */
			}
		K_I_Disable_Sched();	/* set task block. */
		}
	good_bits = activetcb->e_flags & match;	/* what event bits matched. */
	if (mode & 0x02)	/* should we clear the events now? */
		{
		activetcb->e_flags &= ~match;	/* yes, clear them. */
		}
#if (defined(CMXTRACKER) || defined(WINTRACKER))
		if (CMXTRACKER_ON)
			{
			cmxtracker_in4(CXEWATM_K_OK,0,good_bits);
			}
#endif
	K_I_Func_Return();	/* release task lock. */
	return(good_bits);	/* return events that were set according to mask. */
}