/* Destroy a stream descriptor. */
void SNetStreamClose(snet_stream_desc_t *desc)
{
trace(__func__);
assert(desc->refs == 0);
SNetFifoDone(&desc->fifo);
SNetDelete(desc);
}
/* A record arriving via the loopback now leaves the feedback network.
* Remove the detref structure and check for termination conditions. */
void SNetFeedbackLeave(snet_record_t *rec, landing_t *landing, fifo_t *detfifo)
{
snet_stack_t *stack;
detref_t *detref, *first;
trace(__func__);
// record must have a stack of detrefs
if ((stack = DATA_REC(rec, detref)) == NULL) {
SNetUtilDebugFatal("[%s]: missing stack.", __func__);
}
// stack must have at least one detref
if ((detref = SNetStackPop(stack)) == NULL) {
SNetUtilDebugFatal("[%s]: empty stack.", __func__);
}
if (SNetStackIsEmpty(stack)) {
SNetStackDestroy(stack);
DATA_REC(rec, detref) = NULL;
}
// detref must refer to this DetLeave node
if (detref->leave != landing) {
SNetUtilDebugFatal("[%s]: leave %p != landing %p.", __func__,
detref->leave, landing);
}
// reference counter must be at least two
if (detref->refcount < 2) {
SNetUtilDebugFatal("[%s]: refcnt %d < 1.", __func__, detref->refcount);
}
// decrease reference count
if (DETREF_DECR(detref) == 1) {
DETREF_DECR(detref);
}
assert(detref->refcount >= 0);
// pop detrefs in sequence which have no more records in the loopback left.
while ((first = SNetFifoPeekFirst(detfifo)) != NULL) {
// stop processing if more records to come for this sequence counter
if (first->refcount > 0) {
break;
}
SNetFifoGet(detfifo);
SNetFifoDone(&first->recfifo);
SNetDelete(first);
}
}
/* Check if there are any records in the dripback loop left. */
static bool DripBackCheckBusy(landing_dripback2_t *db2)
{
detref_t *first;
/* check if dripback loop is still active */
while ((first = SNetFifoPeekFirst(&db2->detfifo)) != NULL) {
BAR();
if (first->refcount > 0) {
break;
}
SNetFifoGet(&db2->detfifo);
SNetFifoDone(&first->recfifo);
SNetDelete(first);
}
return first ? true : false;
}
/* Check if there are any records in the feedback loop left. */
static void FeedbackCheckBusy(landing_feedback3_t *fb3)
{
detref_t *first;
/* check if feedback loop is still active */
while ((first = SNetFifoPeekFirst(&fb3->detfifo)) != NULL) {
if (first->refcount > 0) {
break;
}
SNetFifoGet(&fb3->detfifo);
SNetFifoDone(&first->recfifo);
SNetDelete(first);
}
if (first == NULL && fb3->terminate == FeedbackDraining) {
fb3->terminate = FeedbackTerminating;
}
}
