qpend.c

VRTX操作系统

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*/
/***************************************************************************
*
*		Copyright (c) 1999 Mentor Graphics Corporation.
*
*
*
*
*
****************************************************************************
*/

#include "queue.h"
#include "kernel.h"
#include "task.h"
#include "processor.h"
#include "delay.h"
#include "q.h"

char *sc_qpend(int qid, unsigned long timeout, int *errp)
{
	cpu_interrupt_t ps;
	struct qentry *queue;
	struct tentry *tcbp;
	char *msg;
	
	if ((unsigned)qid < vmc_nqueue) {
		*errp = RET_OK;
		queue = &vmc_qcb[qid];
		disable(ps);
		if (queue->count) {
			msg = queue->item[queue->head];
			if (++queue->head == queue->maxcount)
				queue->head = 0;
			--queue->count;
			restore(ps);
			return msg;
		}
		msg = 0;
		if (queue->tid == NO_TID) {
			queue->tid = vmc_exectid;
			tcbp = &vmc_tasktab[vmc_exectid];
			tcbp->tstate &= ~TBSEXEC;
			tcbp->tstate |= TBSQUEUE;
			vmc_prio_delete((int) vmc_exectid, &vmc_readyhead);
			tcbp->object.queue.qid = qid;
			vmc_sched_disable();
			interrupt_window(ps);
			
			if (timeout != 0) {
				vmc_insertd((int) vmc_exectid, (unsigned long) timeout, ps);
				tcbp->tstate |= TBSDELAY;
				vmc_dlynempty = TRUE;
				vmc_dlytop = get_vmc_dlytop();
			}
			
			/*
			* During the inserrtion, an interrupt could have come in that
			* could have posted the message to the queue and thus could have
			* made the task ready.
			*/
			
			if (!(tcbp->tstate & TBSQUEUE)) {
				if (tcbp->tstate & TBSDELAY) {
					tcbp->tstate &= ~TBSDELAY;
					if ((vmc_dlynempty = vmc_dequeued((int)queue->tid)) != 0)
						vmc_dlytop = get_vmc_dlytop();
				}
				msg = tcbp->object.queue.message;
				if (vmc_readyhead != vmc_exectid)
					vmc_sched_needed = 1;
				vmc_sched_enable();
				restore(ps);
				return ((SYSCALLc *)msg);
			}
			
			if (vmc_readyhead != vmc_exectid)
				vmc_sched_needed = 1;
			vmc_sched_enable();
			if (tcbp->object.queue.qid == qid) {
				*errp = ER_TMO;
				queue->tid = NO_TID;
				tcbp->object.queue.qid = NO_QID;
			}
			else
				msg = tcbp->object.queue.message;
		}
		else
			*errp = ER_PND;
		restore(ps);
		return msg;
	}
	*errp = ER_QID;
	return ((char *) 0);
}