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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 __ZMQ_YPOLLSET_HPP_INCLUDED__
#define __ZMQ_YPOLLSET_HPP_INCLUDED__
#include "i_signaler.hpp"
#include "simple_semaphore.hpp"
#include "atomic_bitmap.hpp"
namespace zmq
{
// 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
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