/* Terminate any kind of dripback landing. */
void SNetTermDripBack(landing_t *land, fifo_t *fifo)
{
trace(__func__);
if (land->type == LAND_dripback1) {
landing_dripback1_t *db1 = LAND_SPEC(land, dripback1);
if (db1->controldesc) {
snet_record_t *rec = SNetRecCreate(REC_terminate);
land->worker = SNetThreadGetSelf();
SNetWrite(&db1->controldesc, rec, false);
SNetFifoPut(fifo, db1->controldesc);
} else {
SNetLandingDone(db1->dripback2);
}
SNetFreeLanding(land);
}
else if (land->type == LAND_dripback2) {
landing_dripback2_t *db2 = LAND_SPEC(land, dripback2);
if (db2->instdesc) {
fprintf(stderr, "%s: Premature termination of dripback2\n", __func__);
SNetFifoPut(fifo, db2->instdesc);
db2->instdesc = NULL;
}
if (db2->outdesc) {
SNetFifoPut(fifo, db2->outdesc);
db2->outdesc = NULL;
}
SNetFreeLanding(land);
}
else {
assert(0);
}
}
/* Terminate any kind of feedback landing. */
void SNetTermFeedback(landing_t *land, fifo_t *fifo)
{
trace(__func__);
if (land->type == LAND_feedback1) {
landing_feedback1_t *fb1 = LAND_SPEC(land, feedback1);
landing_feedback3_t *fb3 = LAND_SPEC(fb1->feedback3, feedback3);
assert(fb3->terminate == FeedbackInitial);
if (fb1->outdesc) {
SNetFifoPut(fifo, fb1->outdesc);
}
if (fb1->instdesc) {
snet_record_t *recdet = SNetRecCreate(REC_detref, -1L, fb1->feedback3, NULL);
land->worker = SNetThreadGetSelf();
SNetWrite(&fb1->instdesc, recdet, false);
SNetFifoPut(fifo, fb1->instdesc);
}
SNetLandingDone(fb1->feedback2);
SNetLandingDone(fb1->feedback4);
SNetLandingDone(fb1->feedback3);
SNetFreeLanding(land);
}
else if (land->type == LAND_feedback2) {
landing_feedback2_t *fb2 = LAND_SPEC(land, feedback2);
if (fb2->instdesc) {
SNetFifoPut(fifo, fb2->instdesc);
}
SNetLandingDone(fb2->feedback3);
SNetFreeLanding(land);
}
else if (land->type == LAND_feedback3) {
landing_feedback3_t *fb3 = LAND_SPEC(land, feedback3);
SNetLandingDone(fb3->feedback4);
SNetFreeLanding(land);
}
else if (land->type == LAND_feedback4) {
landing_feedback4_t *fb4 = LAND_SPEC(land, feedback4);
if (fb4->outdesc) {
SNetFifoPut(fifo, fb4->outdesc);
}
SNetFreeLanding(land);
}
else {
assert(0);
}
}
/* Enqueue a record to a stream and add a note to the todo list. */
void SNetWrite(snet_stream_desc_t **desc_ptr, snet_record_t *rec, bool last)
{
snet_stream_desc_t *desc = *desc_ptr;
landing_t *land = desc->landing;
worker_t *worker = desc->source->worker;
/* Test if we can garbage collect this stream together with its landing. */
if (land->type == LAND_identity && trylock_landing(land, worker)) {
desc = SNetMergeStreams(desc_ptr);
land = desc->landing;
}
/* Increase the reference count to the destination stream. */
DESC_INCR(desc);
/* If this write was the last statement in the caller function and we can
* lock the destination landing then process the record right away. */
if (last && land->id == 0 && trylock_landing(land, worker)) {
/* Make sure we process records in stream FIFO order. */
worker->continue_rec = (snet_record_t *) SNetFifoPutGet(&desc->fifo, rec);
assert(worker->continue_rec);
worker->continue_desc = desc;
}
else {
/* Store the record into the destination stream. */
SNetFifoPut(&desc->fifo, rec);
/* Add a todo item to this worker's todo queue. */
SNetWorkerTodo(worker, desc);
}
}
/* Enqueue a record to a stream and add a note to the todo list. */
void SNetStreamWrite(snet_stream_desc_t *desc, snet_record_t *rec)
{
DESC_INCR(desc);
SNetFifoPut(&desc->fifo, rec);
assert(desc->source->worker);
SNetWorkerTodo(desc->source->worker, desc);
}
/* Terminate a garbage landing: decrease references to subsequent resources. */
void SNetTermGarbage(landing_t *land, fifo_t *fifo)
{
snet_stream_desc_t *desc = LAND_SPEC(land, siso)->outdesc;
trace(__func__);
assert(desc);
assert(desc->refs > 0);
SNetLandingDone(desc->landing);
SNetFifoPut(fifo, desc);
SNetFreeLanding(land);
}
/* Terminate a star landing. */
void SNetTermStar(landing_t *land, fifo_t *fifo)
{
landing_star_t *lstar = LAND_SPEC(land, star);
trace(__func__);
if (lstar->instdesc) {
SNetFifoPut(fifo, lstar->instdesc);
}
if (lstar->colldesc) {
SNetFifoPut(fifo, lstar->colldesc);
}
if (lstar->instland) {
SNetLandingDone(lstar->instland);
}
SNetLandingDone(lstar->collland);
SNetFreeLanding(land);
}
/* Terminate an identity landing. */
void SNetTermIdentity(landing_t *land, fifo_t *fifo)
{
trace(__func__);
SNetFifoPut(fifo, LAND_SPEC(land, identity)->outdesc);
SNetFreeLanding(land);
}
/* DripBack process a record. */
void SNetNodeDripBack(snet_stream_desc_t *desc, snet_record_t *rec)
{
landing_t *land = desc->landing;
dripback_arg_t *darg = LAND_NODE_SPEC(land, dripback);
trace(__func__);
if (land->type == LAND_dripback1) {
landing_dripback1_t *db1 = LAND_SPEC(land, dripback1);
landing_dripback2_t *db2 = LAND_SPEC(db1->dripback2, dripback2);
SNetFifoPut(db1->recfifo, rec);
if (FAA(&db2->queued, 1) == 0) {
if (db1->controldesc == NULL) {
SNetPushLanding(desc, db1->dripback2);
db1->controldesc = SNetStreamOpen(darg->selfref, desc);
}
rec = SNetRecCreate(REC_wakeup);
SNetWrite(&db1->controldesc, rec, true);
}
}
else if (land->type == LAND_dripback2) {
landing_dripback2_t *db2 = LAND_SPEC(land, dripback2);
bool via_access = (DESC_STREAM(desc) == darg->selfref);
assert(via_access || DESC_STREAM(desc) == darg->dripback);
while (rec) {
switch (REC_DESCR( rec)) {
case REC_data:
/* Test if record should go to the instance. */
if (SNetFeedbackMatch( rec, darg->back_patterns, darg->guards)) {
if (via_access) {
/* Because record came from outside add a detref counter. */
assert(db2->detfifo.head->next == NULL);
SNetRecDetrefAdd(rec, ++(db2->entered), land, &db2->detfifo);
} else {
/* Record came from the instance. */
assert(DATA_REC(rec, detref));
}
if (db2->instdesc == NULL) {
/* Instance should come back to this landing. */
if (SNetTopLanding(desc) != land) {
SNetPushLanding(desc, land);
}
db2->instdesc = SNetStreamOpen(darg->instance, desc);
if (SNetTopLanding(desc) == land) {
SNetPopLanding(desc);
SNetLandingDone(land);
}
}
SNetWrite(&db2->instdesc, rec, false);
} else {
if (!via_access) {
/* Record leaves the dripback loop. */
assert(DATA_REC(rec, detref));
SNetFeedbackLeave(rec, land, &db2->detfifo);
}
if (db2->outdesc == NULL) {
db2->outdesc = SNetStreamOpen(darg->output, desc);
}
SNetWrite(&db2->outdesc, rec, false);
}
break;
case REC_wakeup:
assert(via_access);
SNetRecDestroy(rec);
break;
case REC_terminate:
assert(via_access);
assert(db2->terminate == DripBackInitial);
db2->terminate = DripBackDraining;
SNetRecDestroy(rec);
break;
case REC_detref:
if (DETREF_REC( rec, leave) == land &&
DETREF_REC( rec, location) == SNetDistribGetNodeId())
{
assert(!via_access);
SNetDetLeaveCheckDetref(rec, &db2->detfifo);
if (DETREF_REC( rec, detref) == SNetFifoPeekFirst(&db2->detfifo)) {
DripBackCheckBusy(db2);
}
SNetRecDestroy(rec);
} else {
assert(via_access);
if (db2->outdesc == NULL) {
db2->outdesc = SNetStreamOpen(darg->output, desc);
}
SNetWrite(&db2->outdesc, rec, false);
}
break;
case REC_sync:
SNetRecDestroy(rec);
break;
default:
SNetRecUnknownEnt(__func__, rec, darg->entity);
}
rec = NULL;
if (db2->state == DripBackBusy) {
if (DripBackCheckBusy(db2) == false) {
assert(db2->queued > 0);
if (SAF(&db2->queued, 1) == 0) {
db2->state = DripBackIdle;
} else {
rec = SNetFifoGet(&db2->recfifo);
assert(rec);
via_access = true;
}
}
} else {
assert(db2->state == DripBackIdle);
assert(SNetFifoPeekFirst(&db2->detfifo) == NULL);
if (db2->queued > 0) {
rec = SNetFifoGet(&db2->recfifo);
assert(rec);
via_access = true;
db2->state = DripBackBusy;
}
}
}
if (db2->terminate == DripBackDraining) {
if (db2->state == DripBackIdle) {
assert(db2->queued == 0 && DripBackCheckBusy(db2) == false);
db2->terminate = DripBackTerminated;
}
}
if (db2->terminate == DripBackTerminated) {
if (db2->instdesc) {
snet_stream_desc_t *desc = db2->instdesc;
db2->instdesc = NULL;
SNetDescDone(desc);
SNetLandingDone(land);
}
}
}
else {
assert(0);
}
}
/* Deallocate a stream, but remember it's destination node. */
void SNetStopStream(snet_stream_t *stream, fifo_t *fifo)
{
SNetFifoPut(fifo, STREAM_DEST(stream));
SNetStreamDestroy(stream);
}
