/** Run the patch for the specified number of frames.
*
* Calls all Nodes in (roughly, if parallel) the order _compiled_patch specifies.
*/
void
PatchImpl::process(ProcessContext& context)
{
if (!_process)
return;
NodeImpl::pre_process(context);
// Run all nodes
if (_compiled_patch && _compiled_patch->size() > 0) {
if (context.slaves().size() > 0) {
process_parallel(context);
} else {
process_single(context);
}
}
// Queue any cross-context connections
for (CompiledPatch::QueuedConnections::iterator i = _compiled_patch->queued_connections.begin();
i != _compiled_patch->queued_connections.end(); ++i) {
(*i)->queue(context);
}
NodeImpl::post_process(context);
}
void
PatchImpl::process_parallel(ProcessContext& context)
{
size_t n_slaves = context.slaves().size();
CompiledPatch* const cp = _compiled_patch;
/* Start p-1 slaves */
if (n_slaves >= cp->size())
n_slaves = cp->size()-1;
if (n_slaves > 0) {
for (size_t i = 0; i < cp->size(); ++i)
(*cp)[i].node()->reset_input_ready();
for (size_t i = 0; i < n_slaves; ++i)
context.slaves()[i]->whip(cp, i+1, context);
}
/* Process ourself until everything is done
* This is analogous to ProcessSlave::_whipped(), but this is the master
* (i.e. what the main Jack process thread calls). Where ProcessSlave
* waits on input, this just skips the node and tries the next, to avoid
* waiting in the Jack thread which pisses Jack off.
*/
size_t index = 0;
size_t num_finished = 0; // Number of consecutive finished nodes hit
while (num_finished < cp->size()) {
CompiledNode& n = (*cp)[index];
if (n.node()->process_lock()) {
if (n.node()->n_inputs_ready() == n.n_providers()) {
n.node()->process(context);
/* Signal dependants their input is ready */
for (uint32_t i = 0; i < n.dependants().size(); ++i)
n.dependants()[i]->signal_input_ready();
++num_finished;
} else {
n.node()->process_unlock();
num_finished = 0;
}
} else {
if (n.node()->n_inputs_ready() == n.n_providers())
++num_finished;
else
num_finished = 0;
}
index = (index + 1) % cp->size();
}
/* Tell slaves we're done in case we beat them, and pray they're
* really done by the start of next cycle.
* FIXME: This probably breaks (race) at extremely small nframes where
* ingen is the majority of the DSP load.
*/
for (uint32_t i = 0; i < n_slaves; ++i)
context.slaves()[i]->finish();
}