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diff --git a/src/ypollset.hpp b/src/ypollset.hpp
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+/*
+    Copyright (c) 2007-2009 FastMQ Inc.
+
+    This file is part of 0MQ.
+
+    0MQ is free software; you can redistribute it and/or modify it under
+    the terms of the Lesser GNU General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    0MQ 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
+    Lesser GNU General Public License for more details.
+
+    You should have received a copy of the Lesser GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __ZS_YPOLLSET_HPP_INCLUDED__
+#define __ZS_YPOLLSET_HPP_INCLUDED__
+
+#include "i_signaler.hpp"
+#include "simple_semaphore.hpp"
+#include "atomic_bitmap.hpp"
+
+namespace zs
+{
+
+    //  ypollset allows for rapid polling for up to constant number of  
+    //  different signals each produced by a different thread. The number of
+    //  possible signals is platform-dependent.
+
+    class ypollset_t : public i_signaler
+    {
+    public:
+
+        typedef atomic_bitmap_t::bitmap_t signals_t;
+
+        //  Create the pollset.
+        ypollset_t ();
+
+        //  Send a signal to the pollset (i_singnaler implementation).
+        void signal (int signal_);
+
+        //  Wait for signal. Returns a set of signals in form of a bitmap.
+        //  Signal with index 0 corresponds to value 1, index 1 to value 2,
+        //  index 2 to value 3 etc.
+        signals_t poll ();
+
+        //  Same as poll, however, if there is no signal available,
+        //  function returns zero immediately instead of waiting for a signal.
+        signals_t check ();
+
+    private:
+
+        //  Wait signal is carried in the most significant bit of integer.
+        enum {wait_signal = sizeof (signals_t) * 8 - 1};
+
+        //  The bits of the pollset.
+        atomic_bitmap_t bits;
+
+        //  Used by thread waiting for signals to sleep if there are no
+        //  signals available.
+        simple_semaphore_t sem;
+
+        //  Disable copying of ypollset object.
+        ypollset_t (const ypollset_t&);
+        void operator = (const ypollset_t&);
+    };
+
+}
+
+#endif