Add missing file.

Break up deeply nested code.


git-svn-id: http://svn.drobilla.net/lad/trunk/machina@4930 a436a847-0d15-0410-975c-d299462d15a1

1 files changed, 73 insertions, 0 deletions

diff --git a/src/engine/Slave.hpp b/src/engine/Slave.hpp
new file mode 100644
index 0000000..7a16c10
--- /dev/null
+++ b/src/engine/Slave.hpp
@@ -0,0 +1,73 @@
+/* This file is part of Machina.
+ * Copyright 2007-2012 David Robillard <http://drobilla.net>
+ *
+ * Machina 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 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Machina 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 Machina.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef MACHINA_SLAVE_HPP
+#define MACHINA_SLAVE_HPP
+
+#include "raul/Semaphore.hpp"
+#include "raul/Thread.hpp"
+
+namespace Machina {
+
+/** Thread driven by (realtime safe) signals.
+ *
+ * Use this to perform some task in a separate thread you want to 'drive'
+ * from a realtime (or otherwise) thread.
+ */
+class Slave
+		: public Raul::Thread
+{
+public:
+	Slave() : _whip(0) {}
+	~Slave() { _exit_flag = true; _whip.post(); }
+
+	virtual void join() {
+		_exit_flag = true;
+		_whip.post();
+		Thread::join();
+	}
+
+	/** Tell the slave to do whatever work it does.  Realtime safe. */
+	inline void whip() { _whip.post(); }
+
+protected:
+	/** Worker method.
+	 *
+	 * This is called once from this thread every time whip() is called.
+	 * Implementations likely want to put a single (non loop) chunk of code
+	 * here, e.g. to process an event.
+	 */
+	virtual void _whipped() = 0;
+
+	Raul::Semaphore _whip;
+
+private:
+	inline void _run() {
+		while (true) {
+			_whip.wait();
+			if (_exit_flag) {
+				break;
+			}
+			_whipped();
+		}
+	}
+
+};
+
+} // namespace Machina
+
+#endif // MACHINA_SLAVE_HPP