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libzmq master
The Intelligent Transport Layer
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00001 /* 00002 Copyright (c) 2009-2011 250bpm s.r.o. 00003 Copyright (c) 2007-2009 iMatix Corporation 00004 Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file 00005 00006 This file is part of 0MQ. 00007 00008 0MQ is free software; you can redistribute it and/or modify it under 00009 the terms of the GNU Lesser General Public License as published by 00010 the Free Software Foundation; either version 3 of the License, or 00011 (at your option) any later version. 00012 00013 0MQ is distributed in the hope that it will be useful, 00014 but WITHOUT ANY WARRANTY; without even the implied warranty of 00015 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00016 GNU Lesser General Public License for more details. 00017 00018 You should have received a copy of the GNU Lesser General Public License 00019 along with this program. If not, see <http://www.gnu.org/licenses/>. 00020 */ 00021 00022 #ifndef __ZMQ_FQ_HPP_INCLUDED__ 00023 #define __ZMQ_FQ_HPP_INCLUDED__ 00024 00025 #include "array.hpp" 00026 #include "pipe.hpp" 00027 #include "msg.hpp" 00028 00029 namespace zmq 00030 { 00031 00032 // Class manages a set of inbound pipes. On receive it performs fair 00033 // queueing so that senders gone berserk won't cause denial of 00034 // service for decent senders. 00035 00036 class fq_t 00037 { 00038 public: 00039 00040 fq_t (); 00041 ~fq_t (); 00042 00043 void attach (pipe_t *pipe_); 00044 void activated (pipe_t *pipe_); 00045 void terminated (pipe_t *pipe_); 00046 00047 int recv (msg_t *msg_, int flags_); 00048 int recvpipe (msg_t *msg_, int flags_, pipe_t **pipe_); 00049 bool has_in (); 00050 00051 private: 00052 00053 // Inbound pipes. 00054 typedef array_t <pipe_t, 1> pipes_t; 00055 pipes_t pipes; 00056 00057 // Number of active pipes. All the active pipes are located at the 00058 // beginning of the pipes array. 00059 pipes_t::size_type active; 00060 00061 // Index of the next bound pipe to read a message from. 00062 pipes_t::size_type current; 00063 00064 // If true, part of a multipart message was already received, but 00065 // there are following parts still waiting in the current pipe. 00066 bool more; 00067 00068 fq_t (const fq_t&); 00069 const fq_t &operator = (const fq_t&); 00070 }; 00071 00072 } 00073 00074 #endif