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/*
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************************************************************
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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);
}