diff options
author | Dan Klein <danklei@cisco.com> | 2015-08-24 13:22:48 +0300 |
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committer | Dan Klein <danklei@cisco.com> | 2015-08-24 13:22:48 +0300 |
commit | dab741a80699f86e86c91718872a052cca9bbb25 (patch) | |
tree | 1959c4a2cea440170a5113dcb067796cb20ffb64 /external_libs/python/pyzmq-14.7.0/bundled/zeromq/src/ypipe_conflate.hpp | |
parent | d3f26ece7d4383df0b22fe9c3cb3e695381ec737 (diff) |
Fixed dependencies of Control Plane to use external_lib sources
Diffstat (limited to 'external_libs/python/pyzmq-14.7.0/bundled/zeromq/src/ypipe_conflate.hpp')
-rw-r--r-- | external_libs/python/pyzmq-14.7.0/bundled/zeromq/src/ypipe_conflate.hpp | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/external_libs/python/pyzmq-14.7.0/bundled/zeromq/src/ypipe_conflate.hpp b/external_libs/python/pyzmq-14.7.0/bundled/zeromq/src/ypipe_conflate.hpp new file mode 100644 index 00000000..683137a9 --- /dev/null +++ b/external_libs/python/pyzmq-14.7.0/bundled/zeromq/src/ypipe_conflate.hpp @@ -0,0 +1,137 @@ +/* + Copyright (c) 2007-2015 Contributors as noted in the AUTHORS file + + This file is part of libzmq, the ZeroMQ core engine in C++. + + libzmq is free software; you can redistribute it and/or modify it under + the terms of the GNU Lesser General Public License (LGPL) as published + by the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + As a special exception, the Contributors give you permission to link + this library with independent modules to produce an executable, + regardless of the license terms of these independent modules, and to + copy and distribute the resulting executable under terms of your choice, + provided that you also meet, for each linked independent module, the + terms and conditions of the license of that module. An independent + module is a module which is not derived from or based on this library. + If you modify this library, you must extend this exception to your + version of the library. + + libzmq 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 GNU Lesser General Public + License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with this program. If not, see <http://www.gnu.org/licenses/>. +*/ + +#ifndef __ZMQ_YPIPE_CONFLATE_HPP_INCLUDED__ +#define __ZMQ_YPIPE_CONFLATE_HPP_INCLUDED__ + +#include "platform.hpp" +#include "dbuffer.hpp" +#include "ypipe_base.hpp" + +namespace zmq +{ + + // Adapter for dbuffer, to plug it in instead of a queue for the sake + // of implementing the conflate socket option, which, if set, makes + // the receiving side to discard all incoming messages but the last one. + // + // reader_awake flag is needed here to mimic ypipe delicate behaviour + // around the reader being asleep (see 'c' pointer being NULL in ypipe.hpp) + + template <typename T> class ypipe_conflate_t : public ypipe_base_t <T> + { + public: + + // Initialises the pipe. + inline ypipe_conflate_t () + : reader_awake(false) + { + } + + // The destructor doesn't have to be virtual. It is mad virtual + // just to keep ICC and code checking tools from complaining. + inline virtual ~ypipe_conflate_t () + { + } + + // Following function (write) deliberately copies uninitialised data + // when used with zmq_msg. Initialising the VSM body for + // non-VSM messages won't be good for performance. + +#ifdef ZMQ_HAVE_OPENVMS +#pragma message save +#pragma message disable(UNINIT) +#endif + inline void write (const T &value_, bool incomplete_) + { + (void)incomplete_; + + dbuffer.write (value_); + } + +#ifdef ZMQ_HAVE_OPENVMS +#pragma message restore +#endif + + // There are no incomplete items for conflate ypipe + inline bool unwrite (T *) + { + return false; + } + + // Flush is no-op for conflate ypipe. Reader asleep behaviour + // is as of the usual ypipe. + // Returns false if the reader thread is sleeping. In that case, + // caller is obliged to wake the reader up before using the pipe again. + inline bool flush () + { + return reader_awake; + } + + // Check whether item is available for reading. + inline bool check_read () + { + bool res = dbuffer.check_read (); + if (!res) + reader_awake = false; + + return res; + } + + // Reads an item from the pipe. Returns false if there is no value. + // available. + inline bool read (T *value_) + { + if (!check_read ()) + return false; + + return dbuffer.read (value_); + } + + // Applies the function fn to the first elemenent in the pipe + // and returns the value returned by the fn. + // The pipe mustn't be empty or the function crashes. + inline bool probe (bool (*fn)(const T &)) + { + return dbuffer.probe (fn); + } + + protected: + + dbuffer_t <T> dbuffer; + bool reader_awake; + + // Disable copying of ypipe object. + ypipe_conflate_t (const ypipe_conflate_t&); + const ypipe_conflate_t &operator = (const ypipe_conflate_t&); + }; + +} + +#endif |