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75 lines
2.2 KiB
C++
75 lines
2.2 KiB
C++
/*
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Copyright (c) 2007-2009 FastMQ Inc.
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This file is part of 0MQ.
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0MQ is free software; you can redistribute it and/or modify it under
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the terms of the Lesser GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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0MQ is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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Lesser GNU General Public License for more details.
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You should have received a copy of the Lesser GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __ZMQ_YPOLLSET_HPP_INCLUDED__
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#define __ZMQ_YPOLLSET_HPP_INCLUDED__
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#include "i_signaler.hpp"
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#include "simple_semaphore.hpp"
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#include "atomic_bitmap.hpp"
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namespace zmq
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{
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// ypollset allows for rapid polling for up to constant number of
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// different signals each produced by a different thread. The number of
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// possible signals is platform-dependent.
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class ypollset_t : public i_signaler
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{
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public:
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typedef atomic_bitmap_t::bitmap_t signals_t;
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// Create the pollset.
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ypollset_t ();
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// Send a signal to the pollset (i_singnaler implementation).
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void signal (int signal_);
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// Wait for signal. Returns a set of signals in form of a bitmap.
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// Signal with index 0 corresponds to value 1, index 1 to value 2,
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// index 2 to value 3 etc.
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signals_t poll ();
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// Same as poll, however, if there is no signal available,
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// function returns zero immediately instead of waiting for a signal.
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signals_t check ();
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private:
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// Wait signal is carried in the most significant bit of integer.
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enum {wait_signal = sizeof (signals_t) * 8 - 1};
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// The bits of the pollset.
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atomic_bitmap_t bits;
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// Used by thread waiting for signals to sleep if there are no
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// signals available.
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simple_semaphore_t sem;
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// Disable copying of ypollset object.
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ypollset_t (const ypollset_t&);
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void operator = (const ypollset_t&);
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};
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}
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#endif
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