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diff --git a/libs/pbd/pbd/glib_semaphore.h b/libs/pbd/pbd/glib_semaphore.h
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+++ b/libs/pbd/pbd/glib_semaphore.h
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+/*
+    Copyright (C) 2010 Tim Mayberry
+
+    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.
+
+*/
+
+#ifndef PBD_GLIB_SEMAPHORE_H
+#define PBD_GLIB_SEMAPHORE_H
+
+#include <glibmm/threads.h>
+
+#include "pbd/libpbd_visibility.h"
+#include "atomic_counter.h"
+
+namespace PBD {
+
+class LIBPBD_API GlibSemaphore
+{
+
+	// prevent copying and assignment
+	GlibSemaphore(const GlibSemaphore& sema);
+	GlibSemaphore& operator= (const GlibSemaphore& sema);
+
+public:
+
+	GlibSemaphore (gint initial_val = 1);
+
+	void wait ();
+
+	bool try_wait ();
+
+	void post ();
+
+private:
+
+	atomic_counter           m_counter;
+	Glib::Threads::Cond      m_cond;
+	Glib::Threads::Mutex     m_mutex;
+
+};
+
+} // namespace PBD
+
+#endif // PBD_SEMAPHORE_H