wd内部有状态记录的。

/*******************************************************************************
*
* windWdCancel - cancel a watchdog timer
*
* This routine cancels a watchdog, removing it from the timer queue if needed.
*
* NOMANUAL
*/

void windWdCancel
(
WDOG *wdId /* watch dog to cancel */
)
{

#ifdef WV_INSTRUMENTATION
/* windview - level 2 event logging */
EVT_TASK_1 (EVENT_WINDWDCANCEL, (int) wdId); /* log event */
#endif

if (wdId->status == WDOG_IN_Q)
{
Q_REMOVE (&tickQHead, &wdId->tickNode); /* remove from queue */
wdId->status = WDOG_OUT_OF_Q;
}
}

return (OK);
}