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diff --git a/src/lib/base/IEventQueueBuffer.h b/src/lib/base/IEventQueueBuffer.h
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+++ b/src/lib/base/IEventQueueBuffer.h
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+/*
+ * barrier -- mouse and keyboard sharing utility
+ * Copyright (C) 2012-2016 Symless Ltd.
+ * Copyright (C) 2004 Chris Schoeneman
+ * 
+ * This package is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * found in the file LICENSE that should have accompanied this file.
+ * 
+ * This package 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include "common/IInterface.h"
+#include "common/basic_types.h"
+
+class Event;
+class EventQueueTimer;
+
+//! Event queue buffer interface
+/*!
+An event queue buffer provides a queue of events for an IEventQueue.
+*/
+class IEventQueueBuffer : public IInterface {
+public:
+    enum Type {
+        kNone,        //!< No event is available
+        kSystem,    //!< Event is a system event
+        kUser        //!< Event is a user event
+    };
+
+    //! @name manipulators
+    //@{
+    
+    //! Initialize
+    /*!
+    Useful for platform-specific initialisation from a specific thread.
+    */
+    virtual    void        init() = 0;
+
+    //! Block waiting for an event
+    /*!
+    Wait for an event in the event queue buffer for up to \p timeout
+    seconds.
+    */
+    virtual void        waitForEvent(double timeout) = 0;
+
+    //! Get the next event
+    /*!
+    Get the next event from the buffer.  Return kNone if no event is
+    available.  If a system event is next, return kSystem and fill in
+    event.  The event data in a system event can point to a static
+    buffer (because Event::deleteData() will not attempt to delete
+    data in a kSystem event).  Otherwise, return kUser and fill in
+    \p dataID with the value passed to \c addEvent().
+    */
+    virtual Type        getEvent(Event& event, UInt32& dataID) = 0;
+
+    //! Post an event
+    /*!
+    Add the given event to the end of the queue buffer.  This is a user
+    event and \c getEvent() must be able to identify it as such and
+    return \p dataID.  This method must cause \c waitForEvent() to
+    return at some future time if it's blocked waiting on an event.
+    */
+    virtual bool        addEvent(UInt32 dataID) = 0;
+
+    //@}
+    //! @name accessors
+    //@{
+
+    //! Check if event queue buffer is empty
+    /*!
+    Return true iff the event queue buffer  is empty.
+    */
+    virtual bool        isEmpty() const = 0;
+
+    //! Create a timer object
+    /*!
+    Create and return a timer object.  The object is opaque and is
+    used only by the buffer but it must be a valid object (i.e.
+    not NULL).
+    */
+    virtual EventQueueTimer*
+                        newTimer(double duration, bool oneShot) const = 0;
+
+    //! Destroy a timer object
+    /*!
+    Destroy a timer object previously returned by \c newTimer().
+    */
+    virtual void        deleteTimer(EventQueueTimer*) const = 0;
+
+    //@}
+};