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..74ec06b
--- /dev/null
+++ b/src/engine/Slave.hpp
@@ -0,0 +1,73 @@
+/*
+  This file is part of Machina.
+  Copyright 2007-2013 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 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 <thread>
+
+#include "raul/Semaphore.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:
+	Slave()
+		: _whip(0)
+		, _exit_flag(false)
+		, _thread(&Slave::_run, this)
+	{}
+
+	virtual ~Slave() {
+		_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 (_whip.wait() && !_exit_flag) {
+			_whipped();
+		}
+	}
+
+	bool        _exit_flag;
+	std::thread _thread;
+};
+
+} // namespace machina
+
+#endif // MACHINA_SLAVE_HPP