/*
* Get value from a queued PV.
*/
epicsShareFunc boolean seq_pvGetQ(SS_ID ss, CH_ID chId)
{
PROG *sp = ss->prog;
CHAN *ch = sp->chan + chId;
void *var = valPtr(ch,ss);
EF_ID ev_flag = ch->syncedTo;
PVMETA *meta = metaPtr(ch,ss);
boolean was_empty;
struct getq_cp_arg arg = {ch, var, meta};
if (!ch->queue)
{
errlogSevPrintf(errlogMajor,
"pvGetQ(%s): user error (not queued)\n",
ch->varName
);
return FALSE;
}
was_empty = seqQueueGetF(ch->queue, getq_cp, &arg);
if (ev_flag)
{
epicsMutexMustLock(sp->lock);
/* If queue is now empty, clear the event flag */
if (seqQueueIsEmpty(ch->queue))
{
bitClear(sp->evFlags, ev_flag);
}
epicsMutexUnlock(sp->lock);
}
return (!was_empty);
}
int evaluatePost(SeqQueue queue) {
SeqStack stack;
init(&stack);
while (!seqQueueIsEmpty(&queue)) {
char c = seqDequeue(&queue);
if (c > '0' && c < '9') {
seqPush(&stack, c);
} else {
int x = seqPop(&stack) - '0', y = seqPop(&stack) - '0';
switch (c) {
case '+':
seqPush(&stack, (char) (x + y + '0'));
break;
case '-':
seqPush(&stack, (char) (x - y + '0'));
break;
case '*':
seqPush(&stack, (char) (x * y + '0'));
break;
case '/':
seqPush(&stack, (char) (x / y + '0'));
break;
}
}
}
return seqPeek(&stack) - '0';
}
