Realtime safe parallel graph execution, e.g. run with ingen -e -p 3 for 3 concurrent audio threads.

git-svn-id: http://svn.drobilla.net/lad/ingen@689 a436a847-0d15-0410-975c-d299462d15a1

1 files changed, 83 insertions, 0 deletions

diff --git a/src/libs/engine/ProcessSlave.cpp b/src/libs/engine/ProcessSlave.cpp
new file mode 100644
index 00000000..fba09da4
--- /dev/null
+++ b/src/libs/engine/ProcessSlave.cpp
@@ -0,0 +1,83 @@
+/* This file is part of Ingen.
+ * Copyright (C) 2007 Dave Robillard <http://drobilla.net>
+ * 
+ * Ingen is free software; you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation; either version 2 of the License, or (at your option) any later
+ * version.
+ * 
+ * Ingen is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
+ * 
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <iostream>
+#include "ProcessSlave.hpp"
+#include "Node.hpp"
+#include "CompiledPatch.hpp"
+
+using namespace std;
+
+namespace Ingen {
+
+
+size_t ProcessSlave::_next_id = 0;
+
+
+void
+ProcessSlave::_whipped()
+{
+	assert(_compiled_patch);
+	CompiledPatch* const cp = _compiled_patch;
+
+	/* Iterate over all nodes attempting to run immediately or block then run,
+	 * until we've been through the entire array without getting a lock,
+	 * and thus are finished this cycle.
+	 */
+
+	//size_t run_count = 0;
+	size_t num_finished = 0; // Number of consecutive finished nodes hit
+
+	while (_state == STATE_RUNNING) {
+		
+		CompiledNode& n = (*cp)[_index];
+		
+		if (n.node()->process_lock()) {
+
+			n.node()->wait_for_input(n.n_providers());
+
+			//cout << "************ Thread " << _id << " running "
+			//		<< n.node()->path() << " at index " << _index << endl;
+			n.node()->process(_nframes, _start, _end);
+			
+			//cerr << n.node()->path() << " @ " << &n << " dependants: " << n.dependants().size() << endl;
+			
+			/* Signal dependants their input is ready */
+			for (size_t i=0; i < n.dependants().size(); ++i)
+				n.dependants()[i]->signal_input_ready();
+
+			//++run_count;
+			num_finished = 1;
+		} else {
+			++num_finished;
+		}
+			
+		_index = (_index + 1) % cp->size();
+
+		if (num_finished >= cp->size())
+			break;
+	}
+	
+	_index = 0;
+	_compiled_patch = NULL;
+	_state = STATE_FINISHED;
+
+	//cout << "Thread " << _id << " ran \t" << run_count << " nodes this cycle." << endl;
+}
+
+
+} // namespace Ingen