/**
* Peeks the top record of all streams in waitingset,
* if there is a terminate record, the stream is closed
* and removed from the waitingset
*/
static int DestroyTermInWaitingSet(snet_stream_iter_t *wait_iter,
snet_streamset_t *waitingset)
{
int destroy_cnt=0;
if ( !SNetStreamsetIsEmpty( waitingset)) {
SNetStreamIterReset( wait_iter, waitingset);
while( SNetStreamIterHasNext( wait_iter)) {
snet_stream_desc_t *sd = SNetStreamIterNext( wait_iter);
snet_record_t *wait_rec = SNetStreamPeek( sd);
/* for this stream, check if there is a termination record next */
if ( wait_rec != NULL &&
SNetRecGetDescriptor( wait_rec) == REC_terminate ) {
/* consume, remove from waiting set and free the stream */
(void) SNetStreamRead( sd);
SNetStreamIterRemove( wait_iter);
SNetStreamClose( sd, true);
/* update destroyed counter */
destroy_cnt++;
/* destroy record */
SNetRecDestroy( wait_rec);
}
/* else do nothing */
}
}
return destroy_cnt;
}
static void FbCollReadFbi(struct fbcoll_state *state)
{
snet_record_t *rec;
assert( false == state->terminate );
/* read from feedback stream */
rec = SNetStreamRead( state->backstream);
switch( SNetRecGetDescriptor( rec)) {
case REC_data:
/* relay data record */
SNetStreamWrite( state->outstream, rec);
/* mode switch to FB0 (there is a next iteration) */
state->mode = FBCOLL_FB0;
break;
case REC_sort_end:
assert( 0 == SNetRecGetLevel(rec) );
switch(state->mode) {
case FBCOLL_FB0:
state->mode = FBCOLL_FB1;
/* increase counter (non-functional) */
SNetRecSetNum( rec, SNetRecGetNum(rec)+1);
SNetStreamWrite( state->outstream, rec);
break;
case FBCOLL_FB1:
state->mode = FBCOLL_IN;
/* kill the sort record */
SNetRecDestroy( rec);
break;
default: assert(0);
}
break;
case REC_sync:
SNetStreamReplace( state->backstream, SNetRecGetStream( rec));
SNetRecDestroy( rec);
break;
case REC_terminate:
case REC_collect:
default:
assert(0);
/* if ignoring, at least destroy ... */
SNetRecDestroy( rec);
break;
}
}
/**
* Get a record due to the collector setting
*/
static snet_record_t *GetRecord(
snet_streamset_t *readyset,
int incount,
snet_stream_desc_t **cur_stream)
{
assert(incount >= 1 && *readyset != NULL);
if (*cur_stream == NULL || SNetStreamPeek(*cur_stream) == NULL) {
if (incount == 1) {
*cur_stream = *readyset;
} else {
*cur_stream = SNetStreamPoll(readyset);
}
}
return SNetStreamRead(*cur_stream);
}
/* helper functions to handle mode the feedback collector is in */
static void FbCollReadIn(struct fbcoll_state *state)
{
snet_record_t *rec;
assert( false == state->terminate );
/* read from input stream */
rec = SNetStreamRead( state->instream);
switch( SNetRecGetDescriptor( rec)) {
case REC_data:
/* relay data record */
SNetStreamWrite( state->outstream, rec);
/* append a sort record */
SNetStreamWrite(
state->outstream,
SNetRecCreate( REC_sort_end, 0, 1 ) /*type, lvl, num*/
);
/* mode switch to FB1 */
state->mode = FBCOLL_FB1;
break;
case REC_sort_end:
/* increase the level and forward */
SNetRecSetLevel( rec, SNetRecGetLevel(rec)+1);
SNetStreamWrite( state->outstream, rec);
break;
case REC_terminate:
state->terminate = true;
SNetStreamWrite( state->outstream, rec);
/* note that no sort record has to be appended */
break;
case REC_sync:
SNetStreamReplace( state->instream, SNetRecGetStream( rec));
SNetRecDestroy( rec);
break;
case REC_collect:
default:
assert(0);
/* if ignoring, at least destroy ... */
SNetRecDestroy( rec);
break;
}
}
static void FeedbackBufTask(snet_entity_t *, void *arg)
{
fbbuf_arg_t *fbbarg = (fbbuf_arg_t *)arg;
snet_stream_desc_t *instream;
snet_stream_desc_t *outstream;
snet_record_t *rec;
int out_counter = 0;
int out_capacity;
instream = SNetStreamOpen(fbbarg->in, 'r');
outstream = SNetStreamOpen(fbbarg->out, 'w');
out_capacity = fbbarg->out_capacity;
SNetMemFree( fbbarg);
/* MAIN LOOP */
while(1) {
rec = SNetStreamRead(instream);
if( SNetRecGetDescriptor(rec) == REC_terminate ) {
/* this means, the outstream does not exist anymore! */
SNetRecDestroy(rec);
break; /* exit main loop */
}
if (out_counter+1 >= out_capacity) {
/* new stream */
snet_stream_t *new_stream = SNetStreamCreate(out_capacity);
SNetStreamWrite(outstream,
SNetRecCreate(REC_sync, new_stream)
);
SNetStreamClose(outstream, false);
outstream = SNetStreamOpen(new_stream, 'w');
out_counter = 0;
}
/* write the record to the stream */
SNetStreamWrite(outstream, rec);
out_counter++;
} /* END OF MAIN LOOP */
SNetStreamClose(instream, true);
SNetStreamClose(outstream, false);
}
/**
* Split box task.
*
* Implements both the non-deterministic and deterministic variants.
*/
static void SplitBoxTask(snet_entity_t *ent, void *arg)
{
int i;
split_arg_t *sarg = (split_arg_t *)arg;
snet_stream_desc_t *initial, *instream;
int ltag_val, utag_val;
snet_info_t *info;
snet_record_t *rec;
snet_locvec_t *locvec;
bool terminate = false;
/* a list of all outstreams for all yet created instances */
snet_streamset_t repos_set = NULL;
snet_stream_iter_t *iter = SNetStreamIterCreate( &repos_set);
/* a hashtable for fast lookup, initial capacity = 2^4 = 16 */
hashtab_t *repos_tab = HashtabCreate( 4);
(void) ent; /* NOT USED */
/* for deterministic variant: */
int counter = 0;
initial = SNetStreamOpen(sarg->output, 'w');
instream = SNetStreamOpen(sarg->input, 'r');
/* MAIN LOOP START */
while( !terminate) {
/* read from input stream */
rec = SNetStreamRead( instream);
switch( SNetRecGetDescriptor( rec)) {
case REC_data:
/* get lower and upper tag values */
ltag_val = SNetRecGetTag( rec, sarg->ltag);
utag_val = SNetRecGetTag( rec, sarg->utag);
/* for all tag values */
for( i = ltag_val; i <= utag_val; i++) {
snet_stream_desc_t *outstream = HashtabGet( repos_tab, i);
if( outstream == NULL) {
snet_stream_t *temp_stream;
snet_stream_t *newstream_addr = SNetStreamCreate(0);
/* instance does not exist yet, create it */
outstream = SNetStreamOpen(newstream_addr, 'w');
/* add to lookup table */
HashtabPut( repos_tab, i, outstream);
/* add to list */
SNetStreamsetPut( &repos_set, outstream);
/* create info and location vector for creation of this replica */
info = SNetInfoCopy(sarg->info);
locvec = SNetLocvecSplitSpawn(SNetLocvecGet(sarg->info), i);
SNetLocvecSet(info, locvec);
if( sarg->is_byloc) {
SNetRouteDynamicEnter(info, i, i, sarg->boxfun);
temp_stream = sarg->boxfun(newstream_addr, info, i);
temp_stream = SNetRouteUpdate(info, temp_stream, sarg->location);
SNetRouteDynamicExit(info, i, i, sarg->boxfun);
} else {
SNetRouteDynamicEnter(info, i, sarg->location, sarg->boxfun);
temp_stream = sarg->boxfun(newstream_addr, info, sarg->location);
temp_stream = SNetRouteUpdate(info, temp_stream, sarg->location);
SNetRouteDynamicExit(info, i, sarg->location, sarg->boxfun);
}
/* destroy info and location vector */
SNetLocvecDestroy(locvec);
SNetInfoDestroy(info);
if(temp_stream != NULL) {
/* notify collector about the new instance via initial */
SNetStreamWrite( initial,
SNetRecCreate( REC_collect, temp_stream));
}
} /* end if (outstream==NULL) */
/* multicast the record */
SNetStreamWrite( outstream,
/* copy record for all but the last tag value */
(i!=utag_val) ? SNetRecCopy( rec) : rec
);
} /* end for all tags ltag_val <= i <= utag_val */
/* If deterministic, append a sort record to *all* registered
* instances and the initial stream.
*/
if( sarg->is_det ) {
/* reset iterator */
SNetStreamIterReset( iter, &repos_set);
while( SNetStreamIterHasNext( iter)) {
snet_stream_desc_t *cur_stream = SNetStreamIterNext( iter);
SNetStreamWrite( cur_stream,
SNetRecCreate( REC_sort_end, 0, counter));
}
/* Now also send a sort record to initial,
after the collect records for new instances have been sent */
SNetStreamWrite( initial,
SNetRecCreate( REC_sort_end, 0, counter));
}
/* increment counter for deterministic variant */
counter += 1;
break;
case REC_sync:
{
snet_stream_t *newstream = SNetRecGetStream( rec);
SNetStreamReplace( instream, newstream);
SNetRecDestroy( rec);
}
break;
case REC_sort_end:
/* broadcast the sort record */
SNetStreamIterReset( iter, &repos_set);
/* all instances receive copies of the record */
while( SNetStreamIterHasNext( iter)) {
snet_stream_desc_t *cur_stream = SNetStreamIterNext( iter);
SNetStreamWrite( cur_stream,
SNetRecCreate( REC_sort_end,
/* we have to increase level */
SNetRecGetLevel( rec)+1,
SNetRecGetNum( rec))
);
}
/* send the original record to the initial stream,
but with increased level */
SNetRecSetLevel( rec, SNetRecGetLevel( rec) + 1);
SNetStreamWrite( initial, rec);
break;
case REC_terminate:
SNetStreamIterReset( iter, &repos_set);
/* all instances receive copies of the record */
while( SNetStreamIterHasNext( iter)) {
snet_stream_desc_t *cur_stream = SNetStreamIterNext( iter);
SNetStreamWrite( cur_stream, SNetRecCopy( rec));
SNetStreamIterRemove( iter);
/* close the stream to the instance */
SNetStreamClose( cur_stream, false);
}
/* send the original record to the initial stream */
SNetStreamWrite( initial, rec);
/* note that no sort record has to be appended */
terminate = true;
break;
case REC_collect:
/* invalid control record */
default:
assert( 0);
/* if ignore, at least destroy it */
SNetRecDestroy( rec);
}
} /* MAIN LOOP END */
/* destroy repository */
HashtabDestroy( repos_tab);
SNetStreamIterDestroy( iter);
/* close and destroy initial stream */
SNetStreamClose( initial, false);
/* close instream */
SNetStreamClose( instream, true);
SNetLocvecDestroy(SNetLocvecGet(sarg->info));
SNetInfoDestroy(sarg->info);
/* destroy the argument */
SNetMemFree( sarg);
} /* END of SPLIT BOX TASK */
/**
* Star component task
*/
static void StarBoxTask(void *arg)
{
star_arg_t *sarg = arg;
snet_record_t *rec;
/* read from input stream */
rec = SNetStreamRead( sarg->instream);
switch( SNetRecGetDescriptor( rec)) {
case REC_data:
if( MatchesExitPattern( rec, sarg->exit_patterns, sarg->guards)) {
assert(!sarg->sync_cleanup);
#ifdef DEBUG_PRINT_GC
SNetUtilDebugNoticeEnt( ent,
"[STAR] Notice: Data leaves replication network.");
#endif
/* send rec to collector */
SNetStreamWrite( sarg->outstream, rec);
} else {
/* if instance has not been created yet, create it */
if( sarg->nextstream == NULL) {
CreateOperandNetwork(&sarg->nextstream, sarg, sarg->outstream);
}
/* send the record to the instance */
SNetStreamWrite( sarg->nextstream, rec);
} /* end if not matches exit pattern */
/* deterministic non-incarnate has to append control records */
if (sarg->is_det && !sarg->is_incarnate) {
/* send new sort record to collector level=0, counter=0*/
SNetStreamWrite( sarg->outstream,
SNetRecCreate( REC_sort_end, 0, sarg->counter) );
/* if has next instance, send new sort record */
if (sarg->nextstream != NULL) {
SNetStreamWrite( sarg->nextstream,
SNetRecCreate( REC_sort_end, 0, sarg->counter) );
}
/* increment counter */
sarg->counter++;
}
#ifdef ENABLE_GC
else if (sarg->sync_cleanup) {
snet_record_t *term_rec;
/*
* If sync_cleanup is set, we decided to postpone termination
* due to garbage collection triggered by a sync record until now.
* Postponing was done in order not to create the operand network unnecessarily
* only to be able to forward the sync record.
*/
assert( sarg->nextstream != NULL);
/* first send a sync record to the next instance */
SNetStreamWrite( sarg->nextstream,
SNetRecCreate( REC_sync, SNetStreamGet(sarg->instream)) );
/* send a terminate record to collector, it will close and
destroy the stream */
term_rec = SNetRecCreate(REC_terminate);
SNetRecSetFlag(term_rec);
SNetStreamWrite( sarg->outstream, term_rec);
#ifdef DEBUG_PRINT_GC
/* terminating due to GC */
SNetUtilDebugNoticeEnt( ent,
"[STAR] Notice: Destroying star dispatcher due to GC, "
"delayed until new data record!"
);
#endif
SNetStreamClose(sarg->nextstream, false);
SNetStreamClose(sarg->instream, false);
TerminateStarBoxTask(sarg->outstream,sarg);
return;
}
#endif /* ENABLE_GC */
break;
case REC_sync:
{
snet_stream_t *newstream = SNetRecGetStream( rec);
#ifdef ENABLE_GC
snet_locvec_t *loc = SNetStreamGetSource( newstream);
#ifdef DEBUG_PRINT_GC
if (loc != NULL) {
int size = SNetLocvecPrintSize(loc) + 1;
char srecloc[size];
srecloc[size - 1] = '\0';
SNetLocvecPrint(srecloc, loc);
SNetUtilDebugNoticeTask(
"[STAR] Notice: Received sync record with a stream with source %s.",
srecloc
);
}
#endif
/* TODO
* It is not necessary to carry the whole location vector in the
* next stream of a star-entity, only a flag. As a prerequisite,
* non_incarnates must not clean themselves up!
*/
/*
* Only incarnates are eligible for cleanup!
* check if the source (location) of the stream and the own location are
* (subsequent) star dispatcher entities of the same star combinator network
* -> if so, we can clean-up ourselves
*/
if ( sarg->is_incarnate && loc != NULL ) {
assert( true == SNetLocvecEqualParent(loc, SNetLocvecGet(sarg->info)) );
/* If the next instance is already created, we can forward the sync-record
* immediately and terminate.
* Otherwise we postpone termination to the point when a next data record
* is received, as we create the operand network then.
*/
if (sarg->nextstream != NULL) {
snet_record_t *term_rec;
/* forward the sync record */
SNetStreamWrite( sarg->nextstream, rec);
/* send a terminate record to collector, it will close and
destroy the stream */
term_rec = SNetRecCreate(REC_terminate);
SNetRecSetFlag(term_rec);
SNetStreamWrite( sarg->outstream, term_rec);
#ifdef DEBUG_PRINT_GC
/* terminating due to GC */
SNetUtilDebugNoticeEnt( ent,
"[STAR] Notice: Destroying star dispatcher due to GC, "
"immediately on sync!"
);
#endif
SNetStreamClose(sarg->nextstream, false);
SNetStreamClose(sarg->instream, true);
TerminateStarBoxTask(sarg->outstream,sarg);
return;
} else {
sarg->sync_cleanup = true;
#ifdef DEBUG_PRINT_GC
SNetUtilDebugNoticeEnt( ent,
"[STAR] Notice: Remembering delayed destruction.");
#endif
/* handle sync record as usual */
SNetStreamReplace( sarg->instream, newstream);
SNetRecDestroy( rec);
}
} else
#endif /* ENABLE_GC */
{
/* handle sync record as usual */
SNetStreamReplace( sarg->instream, newstream);
SNetRecDestroy( rec);
}
}
break;
case REC_sort_end:
{
int rec_lvl = SNetRecGetLevel(rec);
/* send a copy to the box, if exists */
if( sarg->nextstream != NULL) {
SNetStreamWrite(
sarg->nextstream,
SNetRecCreate( REC_sort_end,
(!sarg->is_incarnate)? rec_lvl+1 : rec_lvl,
SNetRecGetNum(rec) )
);
}
/* send the original one to the collector */
if (!sarg->is_incarnate) {
/* if non-incarnate, we have to increase level */
SNetRecSetLevel( rec, rec_lvl+1);
}
SNetStreamWrite( sarg->outstream, rec);
}
break;
case REC_terminate:
if( sarg->nextstream != NULL) {
SNetStreamWrite( sarg->nextstream, SNetRecCopy( rec));
SNetStreamClose( sarg->nextstream, false);
}
SNetStreamWrite( sarg->outstream, rec);
/* note that no sort record has to be appended */
SNetStreamClose(sarg->instream, true);
TerminateStarBoxTask(sarg->outstream,sarg);
return;
case REC_collect:
default:
SNetUtilDebugFatal("Unknown record type!");
/* if ignore, at least destroy ... */
SNetRecDestroy( rec);
}
SNetThreadingRespawn(NULL);
}
static void BoxTask(snet_entity_t *ent, void *arg)
{
#ifdef DBG_RT_TRACE_BOX_TIMINGS
static struct timeval tv_in;
static struct timeval tv_out;
#endif
#ifdef SNET_DEBUG_COUNTERS
snet_time_t time_in;
snet_time_t time_out;
long mseconds;
#endif /* SNET_DEBUG_COUNTERS */
box_arg_t *barg = (box_arg_t *)arg;
snet_record_t *rec;
snet_stream_desc_t *instream, *outstream;
bool terminate = false;
instream = SNetStreamOpen(barg->input, 'r');
outstream = SNetStreamOpen(barg->output, 'w');
/* set out descriptor */
barg->hnd.out_sd = outstream;
/* set entity */
barg->hnd.ent = ent;
/* MAIN LOOP */
while(!terminate) {
/* read from input stream */
rec = SNetStreamRead(instream);
switch(SNetRecGetDescriptor(rec)) {
case REC_trigger_initialiser:
case REC_data:
barg->hnd.rec = rec;
#ifdef DBG_RT_TRACE_BOX_TIMINGS
gettimeofday(&tv_in, NULL);
SNetUtilDebugNoticeEnt(ent,
"[BOX] Firing box function at %lf.",
tv_in.tv_sec + tv_in.tv_usec / 1000000.0
);
#endif
#ifdef SNET_DEBUG_COUNTERS
SNetDebugTimeGetTime(&time_in);
#endif /* SNET_DEBUG_COUNTERS */
#ifdef USE_USER_EVENT_LOGGING
/* Emit a monitoring message of a record read to be processed by a box */
if (SNetRecGetDescriptor(rec) == REC_data) {
SNetThreadingEventSignal(ent,
SNetMonInfoCreate(EV_MESSAGE_IN, MON_RECORD, rec)
);
}
#endif
/* execute box function and update execution realm */
barg->hnd = *barg->boxfun(&barg->hnd);
barg->hnd = *barg->exerealm_update(&barg->hnd);
/*
* Emit an event here?
* SNetMonInfoEvent(EV_BOX_???, MON_RECORD, rec);
*/
#ifdef DBG_RT_TRACE_BOX_TIMINGS
gettimeofday(&tv_out, NULL);
SNetUtilDebugNoticeEnt(ent,
"[BOX] Return from box function after %lf sec.",
(tv_out.tv_sec - tv_in.tv_sec) + (tv_out.tv_usec - tv_in.tv_usec) / 1000000.0
);
#endif
#ifdef SNET_DEBUG_COUNTERS
SNetDebugTimeGetTime(&time_out);
mseconds = SNetDebugTimeDifferenceInMilliseconds(&time_in, &time_out);
SNetDebugCountersIncreaseCounter(mseconds, SNET_COUNTER_TIME_BOX);
#endif /* SNET_DEBUG_COUNTERS */
SNetRecDestroy(rec);
/* restrict to one data record per execution */
//SNetThreadingYield();
/* check the box task should be migrated after one record execution */
SNetThreadingCheckMigrate();
break;
case REC_sync:
{
snet_stream_t *newstream = SNetRecGetStream(rec);
SNetStreamReplace(instream, newstream);
SNetRecDestroy(rec);
}
break;
case REC_sort_end:
/* forward the sort record */
SNetStreamWrite(outstream, rec);
break;
case REC_terminate:
barg->hnd = *barg->exerealm_destroy(&barg->hnd);
SNetStreamWrite(outstream, rec);
terminate = true;
break;
case REC_collect:
default:
assert(0);
}
} /* MAIN LOOP END */
barg->hnd = *barg->exerealm_destroy(&barg->hnd);
SNetStreamClose(instream, true);
SNetStreamClose(outstream, false);
/* destroy box arg */
SNetVariantListDestroy(barg->hnd.vars);
SNetIntListListDestroy(barg->hnd.sign);
SNetMemFree( barg);
}
/**
* The feedback buffer, in the back-loop
*/
static void FeedbackBufTask(snet_entity_t *ent, void *arg)
{
fbbuf_arg_t *fbbarg = (fbbuf_arg_t *)arg;
snet_stream_desc_t *instream;
snet_stream_desc_t *outstream;
snet_queue_t *internal_buffer;
snet_record_t *rec;
int out_capacity;
int max_read;
(void) ent; /* NOT USED */
instream = SNetStreamOpen(fbbarg->in, 'r');
outstream = SNetStreamOpen(fbbarg->out, 'w');
out_capacity = fbbarg->out_capacity;
SNetMemFree( fbbarg);
internal_buffer = SNetQueueCreate();
max_read = out_capacity; /* TODO better usual stream capacity */
/* MAIN LOOP */
while(1) {
int n = 0;
rec = NULL;
/* STEP 1: read n=min(available,max_read) records from input stream */
/* read first record of the actual dispatch */
if (0 == SNetQueueSize(internal_buffer)) {
rec = SNetStreamRead(instream);
/* only in empty mode! */
if( REC_terminate == SNetRecGetDescriptor( rec)) {
/* this means, the outstream does not exist anymore! */
SNetRecDestroy(rec);
goto feedback_buf_epilogue;
}
} else {
SNetThreadingYield();
if ( SNetStreamPeek(instream) != NULL ) {
rec = SNetStreamRead(instream);
assert( REC_terminate != SNetRecGetDescriptor( rec) );
}
}
if (rec != NULL) {
n = 1;
/* put record into internal buffer */
(void) SNetQueuePut(internal_buffer, rec);
}
while ( n<=max_read && SNetStreamPeek(instream)!=NULL ) {
rec = SNetStreamRead(instream);
/* check if we will need a larger outstream, and if so,
* create a larger stream
*/
if (SNetQueueSize(internal_buffer)+1 >= out_capacity) {
snet_stream_t *new_stream;
out_capacity *= 2;
new_stream = SNetStreamCreate(out_capacity);
(void) SNetQueuePut(internal_buffer, SNetRecCreate(REC_sync, new_stream));
}
/* put record into internal buffer */
(void) SNetQueuePut(internal_buffer, rec);
n++;
}
/* STEP 2: try to empty the internal buffer */
rec = SNetQueuePeek(internal_buffer);
while (rec != NULL) {
snet_stream_t *new_stream = NULL;
if( REC_sync == SNetRecGetDescriptor( rec)) {
new_stream = SNetRecGetStream(rec);
}
if (0 == SNetStreamTryWrite(outstream, rec)) {
snet_record_t *rem;
/* success, also remove from queue */
rem = SNetQueueGet(internal_buffer);
assert( rem == rec );
if (new_stream != NULL) {
/* written sync record, now change stream */
SNetStreamClose(outstream, false);
outstream = SNetStreamOpen(new_stream, 'w');
}
} else {
/* there remain elements in the buffer */
break;
}
/* for the next iteration */
rec = SNetQueuePeek(internal_buffer);
}
} /* END OF MAIN LOOP */
feedback_buf_epilogue:
SNetQueueDestroy(internal_buffer);
SNetStreamClose(instream, true);
SNetStreamClose(outstream, false);
}
/**
* The feedback dispatcher, at the end of the
* feedback combinator loop
*/
static void FeedbackDispTask(snet_entity_t *ent, void *arg)
{
fbdisp_arg_t *fbdarg = (fbdisp_arg_t *)arg;
snet_stream_desc_t *instream;
snet_stream_desc_t *outstream;
snet_stream_desc_t *backstream;
bool terminate = false;
snet_record_t *rec;
(void) ent; /* NOT USED */
instream = SNetStreamOpen(fbdarg->in, 'r');
outstream = SNetStreamOpen(fbdarg->out, 'w');
backstream = SNetStreamOpen(fbdarg->fbo, 'w');
/* MAIN LOOP */
while( !terminate) {
/* read from input stream */
rec = SNetStreamRead( instream);
switch( SNetRecGetDescriptor( rec)) {
case REC_data:
/* route data record */
if( MatchesBackPattern( rec, fbdarg->back_patterns, fbdarg->guards)) {
/* send rec back into the loop */
SNetStreamWrite( backstream, rec);
} else {
/* send to output */
SNetStreamWrite( outstream, rec);
}
break;
case REC_sort_end:
{
int lvl = SNetRecGetLevel(rec);
if ( 0 == lvl ) {
SNetStreamWrite( backstream, rec);
} else {
assert( lvl > 0 );
SNetRecSetLevel( rec, lvl-1);
SNetStreamWrite( outstream, rec);
}
}
break;
case REC_terminate:
terminate = true;
#ifndef FEEDBACK_OMIT_BUFFER
/* a terminate record is sent in the backloop for the buffer */
SNetStreamWrite( backstream, SNetRecCopy( rec));
#endif
SNetStreamWrite( outstream, rec);
break;
case REC_sync:
SNetStreamReplace( instream, SNetRecGetStream( rec));
SNetRecDestroy( rec);
break;
case REC_collect:
default:
assert(0);
/* if ignoring, at least destroy ... */
SNetRecDestroy( rec);
break;
}
} /* END OF MAIN LOOP */
SNetStreamClose(instream, true);
SNetStreamClose(outstream, false);
SNetStreamClose(backstream, false);
SNetVariantListDestroy( fbdarg->back_patterns);
SNetExprListDestroy( fbdarg->guards);
SNetMemFree( fbdarg);
}