/* DripBack creation function */
snet_stream_t *SNetDripBack(
snet_stream_t *input,
snet_info_t *info,
int location,
snet_variant_list_t *back_patterns,
snet_expr_list_t *guards,
snet_startup_fun_t box_a)
{
snet_stream_t *output;
node_t *node;
dripback_arg_t *darg;
snet_locvec_t *locvec;
int detlevel;
trace(__func__);
detlevel = SNetDetSwapLevel(0);
locvec = SNetLocvecGet(info);
SNetLocvecFeedbackEnter(locvec);
output = SNetStreamCreate(0);
node = SNetNodeNew(NODE_dripback, location, &input, 1, &output, 1,
SNetNodeDripBack, SNetStopDripBack, SNetTermDripBack);
darg = NODE_SPEC(node, dripback);
/* fill in the node argument */
darg->input = input;
darg->output = output;
darg->back_patterns = back_patterns;
darg->guards = guards;
darg->stopping = 0;
/* Create the instance network */
darg->instance = SNetNodeStreamCreate(node);
SNetSubnetIncrLevel();
darg->dripback = (*box_a)(darg->instance, info, location);
SNetSubnetDecrLevel();
STREAM_DEST(darg->dripback) = node;
SNetNodeTableAdd(darg->dripback);
/* Create one self-referencing stream. */
darg->selfref = SNetNodeStreamCreate(node);
STREAM_DEST(darg->selfref) = node;
SNetNodeTableAdd(darg->selfref);
darg->entity = SNetEntityCreate( ENTITY_fbdisp, location, locvec,
"<feedback>", NULL, (void*)darg);
SNetLocvecFeedbackLeave(locvec);
SNetDetSwapLevel(detlevel);
return output;
}
/* Feedback creation function */
snet_stream_t *SNetFeedback(
snet_stream_t *input,
snet_info_t *info,
int location,
snet_variant_list_t *back_patterns,
snet_expr_list_t *guards,
snet_startup_fun_t box_a)
{
snet_stream_t *output;
node_t *node;
feedback_arg_t *farg;
snet_locvec_t *locvec;
int detlevel;
trace(__func__);
if (SNetFeedbackDeterministic()) {
return SNetDripBack(input, info, location, back_patterns, guards, box_a);
}
detlevel = SNetDetSwapLevel(0);
locvec = SNetLocvecGet(info);
SNetLocvecFeedbackEnter(locvec);
input = SNetRouteUpdate(info, input, location);
if (SNetDistribIsNodeLocation(location)) {
output = SNetStreamCreate(0);
node = SNetNodeNew(NODE_feedback, &input, 1, &output, 1,
SNetNodeFeedback, SNetStopFeedback, SNetTermFeedback);
farg = NODE_SPEC(node, feedback);
/* fill in the node argument */
farg->input = input;
farg->output = output;
farg->back_patterns = back_patterns;
farg->guards = guards;
farg->stopping = 0;
/* Create the instance network */
farg->instance = SNetNodeStreamCreate(node);
farg->feedback = (*box_a)(farg->instance, info, location);
farg->feedback = SNetRouteUpdate(info, farg->feedback, location);
/* Feedback loop should end at this node. */
assert(STREAM_DEST(farg->feedback) == NULL);
STREAM_DEST(farg->feedback) = node;
/* Create two self-referencing streams. */
farg->selfref2 = SNetNodeStreamCreate(node);
STREAM_DEST(farg->selfref2) = node;
farg->selfref4 = SNetNodeStreamCreate(node);
STREAM_DEST(farg->selfref4) = node;
farg->entity = SNetEntityCreate( ENTITY_fbdisp, location, locvec,
"<feedback>", NULL, (void*)farg);
} else {
SNetExprListDestroy( guards);
SNetVariantListDestroy(back_patterns);
output = input;
}
SNetLocvecFeedbackLeave(locvec);
SNetDetSwapLevel(detlevel);
return output;
}
/**
* Convenience function for creating
* Star, DetStar, StarIncarnate or DetStarIncarnate,
* dependent on parameters is_incarnate and is_det.
*/
static snet_stream_t *CreateStar(
snet_stream_t *input,
snet_info_t *info,
int location,
snet_variant_list_t *exit_patterns,
snet_expr_list_t *guards,
snet_startup_fun_t box_a,
snet_startup_fun_t box_b,
bool is_incarnate,
bool is_det)
{
snet_stream_t *output;
node_t *node;
star_arg_t *sarg;
snet_locvec_t *locvec;
locvec = SNetLocvecGet(info);
if (!is_incarnate) {
SNetLocvecStarEnter(locvec);
} else {
assert(false);
}
output = SNetStreamCreate(0);
node = SNetNodeNew(NODE_star, location, &input, 1, &output, 1,
SNetNodeStar, SNetStopStar, SNetTermStar);
sarg = NODE_SPEC(node, star);
sarg->input = input;
sarg->collector = output;
sarg->exit_patterns = exit_patterns;
sarg->guards = guards;
sarg->is_incarnate = is_incarnate;
sarg->is_det = is_det;
sarg->is_detsup = (SNetDetGetLevel() > 0);
sarg->stopping = 0;
/* create operand A */
sarg->instance = SNetNodeStreamCreate(node);
(void) SNetLocvecStarSpawn(locvec);
SNetSubnetIncrLevel();
sarg->internal = (*box_a)(sarg->instance, info, location);
SNetSubnetDecrLevel();
(void) SNetLocvecStarSpawnRet(locvec);
/* direct destination of operand back to this node */
STREAM_DEST(sarg->internal) = node;
/* Is this a Star followed by only a Sync? */
if (SNetZipperEnabled() &&
NODE_TYPE(STREAM_DEST(sarg->instance)) == NODE_sync &&
STREAM_FROM(sarg->internal) == STREAM_DEST(sarg->instance))
{
/* Replace the combination of star + sync with a fused sync-star. */
sync_arg_t *sync = NODE_SPEC(STREAM_DEST(sarg->instance), sync);
/* if (SNetVerbose()) {
printf("Replacing a star + sync with a fused sync-star.\n");
} */
output = SNetZipper(input, info, location, exit_patterns, guards,
sync->patterns, sync->guard_exprs);
SNetEntityDestroy(sync->entity);
SNetVariantDestroy(sync->merged_pattern);
SNetDelete(STREAM_DEST(sarg->instance));
SNetStreamDestroy(sarg->instance);
SNetStreamDestroy(sarg->internal);
SNetStreamDestroy(sarg->collector);
SNetMemFree(node);
} else {
sarg->entity = SNetEntityCreate( ENTITY_star, location, locvec,
"<star>", NULL, (void *) sarg);
if (!is_incarnate) {
/* the "top-level" star also creates a collector */
output = SNetCollectorDynamic(sarg->collector, location, info,
is_det, node);
SNetNodeTableAdd(sarg->internal);
}
}
if (!is_incarnate) {
SNetLocvecStarLeave(locvec);
}
return output;
}