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diff --git a/src/lib/arch/IArchSleep.h b/src/lib/arch/IArchSleep.h
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+++ b/src/lib/arch/IArchSleep.h
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+/*
+ * barrier -- mouse and keyboard sharing utility
+ * Copyright (C) 2012-2016 Symless Ltd.
+ * Copyright (C) 2002 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"
+
+//! Interface for architecture dependent sleeping
+/*!
+This interface defines the sleep operations required by
+barrier.  Each architecture must implement this interface.
+*/
+class IArchSleep : public IInterface {
+public:
+    //! @name manipulators
+    //@{
+
+    //! Sleep
+    /*!
+    Blocks the calling thread for \c timeout seconds.  If
+    \c timeout < 0.0 then the call returns immediately.  If \c timeout
+    == 0.0 then the calling thread yields the CPU.
+
+    (cancellation point)
+    */
+    virtual void        sleep(double timeout) = 0;
+
+    //@}
+};