diff options
author | Martin Sustrik <sustrik@fastmq.commkdir> | 2009-07-29 12:07:54 +0200 |
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committer | Martin Sustrik <sustrik@fastmq.commkdir> | 2009-07-29 12:07:54 +0200 |
commit | 4ed70a930202b103e7e80b8dc925e0aaa4622595 (patch) | |
tree | aeed881ce17629f81b7c90f7d675aac8ecf69d4f /src/fd_signaler.hpp |
initial commit
Diffstat (limited to 'src/fd_signaler.hpp')
-rw-r--r-- | src/fd_signaler.hpp | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/src/fd_signaler.hpp b/src/fd_signaler.hpp new file mode 100644 index 0000000..34c5e8c --- /dev/null +++ b/src/fd_signaler.hpp @@ -0,0 +1,92 @@ +/* + 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 |