1 files changed, 115 insertions, 0 deletions
diff --git a/libs/ardour/worker.cc b/libs/ardour/worker.cc
new file mode 100644
index 0000000000..c108f653c4
--- /dev/null
+++ b/libs/ardour/worker.cc
@@ -0,0 +1,115 @@
+/*
+  Copyright (C) 2012 Paul Davis
+  Author: David Robillard
+
+  This program 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.
+
+  This program 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 more 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include <stdlib.h>
+
+#include "ardour/worker.h"
+#include "pbd/error.h"
+
+namespace ARDOUR {
+
+Worker::Worker(Workee* workee, uint32_t ring_size)
+	: _workee(workee)
+	, _thread(Glib::Thread::create(sigc::mem_fun(*this, &Worker::run), true))
+	, _requests(new RingBuffer<uint8_t>(ring_size))
+	, _responses(new RingBuffer<uint8_t>(ring_size))
+	, _response((uint8_t*)malloc(ring_size))
+	, _sem(0)
+	, _exit(false)
+{}
+
+Worker::~Worker()
+{
+	_exit = true;
+	_sem.post();
+	_thread->join();
+}
+
+bool
+Worker::schedule(uint32_t size, const void* data)
+{
+	if (_requests->write((const uint8_t*)&size, sizeof(size)) != sizeof(size)) {
+		return false;
+	}
+	if (_requests->write((const uint8_t*)data, size) != size) {
+		return false;  // FIXME: corruption
+	}
+	_sem.post();
+	return true;
+}
+
+bool
+Worker::respond(uint32_t size, const void* data)
+{
+	if (_responses->write((const uint8_t*)&size, sizeof(size)) != sizeof(size)) {
+		return false;
+	}
+	if (_responses->write((const uint8_t*)data, size) != size) {
+		return false;  // FIXME: corruption
+	}
+	return true;
+}
+
+void
+Worker::emit_responses()
+{
+	uint32_t read_space = _responses->read_space();
+	uint32_t size       = 0;
+	while (read_space > sizeof(size)) {
+		_responses->read((uint8_t*)&size, sizeof(size));
+		_responses->read(_response, size);
+		_workee->work_response(size, _response);
+		read_space -= sizeof(size) + size;
+	}
+}
+
+void
+Worker::run()
+{
+	void*  buf      = NULL;
+	size_t buf_size = 0;
+	while (true) {
+		_sem.wait();
+		if (_exit) {
+			return;
+		}
+
+		uint32_t size = 0;
+		if (_requests->read((uint8_t*)&size, sizeof(size)) < sizeof(size)) {
+			PBD::error << "Worker: Error reading size from request ring"
+			           << endmsg;
+			continue;
+		}
+
+		if (size > buf_size) {
+			buf = realloc(buf, size);
+			buf_size = size;
+		}
+
+		if (_requests->read((uint8_t*)buf, size) < size) {
+			PBD::error << "Worker: Error reading body from request ring"
+			           << endmsg;
+			continue;  // TODO: This is probably fatal
+		}
+
+		_workee->work(size, buf);
+	}
+}
+
+} // namespace ARDOUR