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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_FD_SIGNALER_HPP_INCLUDED__
#define __ZS_FD_SIGNALER_HPP_INCLUDED__
#include "platform.hpp"
#include "i_signaler.hpp"
#include "fd.hpp"
#include "stdint.hpp"
namespace zs
{
// This object can be used to send individual signals from one thread to
// another. The specific of this pipe is that it has associated file
// descriptor and so it can be polled on. Same signal cannot be sent twice
// unless signals are retrieved by the reader side in the meantime.
class fd_signaler_t : public i_signaler
{
public:
typedef uint64_t signals_t;
// Initialise the object.
fd_signaler_t ();
// Destroy the object.
~fd_signaler_t ();
// Send specific signal.
void signal (int signal_);
// Retrieves signals. 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 4 etc. If there is no signal available,
// it returns zero immediately.
signals_t check ();
// Get the file descriptor associated with the object.
fd_t get_fd ();
private:
#if defined ZMQ_HAVE_OPENVMS
// Whilst OpenVMS supports socketpair - it maps to AF_INET only.
// Further, it does not set the socket options TCP_NODELAY and
// TCP_NODELACK which can lead to performance problems. We'll
// overload the socketpair function for this class.
//
// The bug will be fixed in V5.6 ECO4 and beyond. In the
// meantime, we'll create the socket pair manually.
static int socketpair (int domain_, int type_, int protocol_,
int sv_ [2]);
#endif
#if defined ZS_HAVE_EVENTFD
// Eventfd descriptor.
fd_t fd;
#else
// Write & read end of the socketpair.
fd_t w;
fd_t r;
#endif
// Disable copying of fd_signeler object.
fd_signaler_t (const fd_signaler_t&);
void operator = (const fd_signaler_t&);
};
}
#endif
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