153 lines
3.5 KiB
C++
153 lines
3.5 KiB
C++
/*
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----
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This file is part of SECONDO.
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Copyright (C) 2015,
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Faculty of Mathematics and Computer Science,
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Database Systems for New Applications.
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SECONDO is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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SECONDO 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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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with SECONDO; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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----
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September 2015 - Nico Kaufmann: IPCLoopBuffer is inspired by an article
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on codeproject.com by Richard Lin
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www.codeproject.com/Articles/10618/Loop-buffer-an-efficient-way-of-using-shared-memor
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(havn't looked at the source so i'm not sure how similar it actually is)
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*/
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#ifndef IPC_H_
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#define IPC_H_
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#include "boost/thread.hpp"
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#include <set>
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#include "IPCMessages.h"
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static const int IPC_QUEUE_BUFFER_SIZE = 1024 * 32;
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static const int IPC_MAGIC_ID = 54923;
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static const int IPC_MAX_STRING_SIZE = 1024 * 1024 * 10;
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static const int IPC_MAX_ARRAY_SIZE = 1024 * 1024 * 10;
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//
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// Used to connect algebra and application
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//
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class IPCInit {
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public:
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IPCInit();
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int magicId; // magic number initialized last (sync)
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boost::mutex currentIdxMutex; // to modify nextIdx
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int confirmIdx; // modified by server
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int nextIdx; // modified by client
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};
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class IPCLoopBuffer {
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public:
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IPCLoopBuffer();
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int magicId;
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int bufferSize;
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int ownerId;
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int readIndex;
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int writeIndex;
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unsigned long long int totalWritten;
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unsigned long long int totalRead;
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char buffer[IPC_QUEUE_BUFFER_SIZE];
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bool avail();
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bool read(char* data, unsigned int n);
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bool write(const char* data, unsigned int n);
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};
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// to help transfer basic arrays
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template <typename T>
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struct IPCArray {
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IPCArray(T* array, unsigned int size) : array(array), size(size) {}
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T* array;
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unsigned int size;
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};
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class IPCConnection {
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public:
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IPCConnection(void* handle, bool server, int connectionId);
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~IPCConnection();
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void close();
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bool health();
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static IPCConnection* connect(int id);
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bool avail();
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bool read(char* data, unsigned int n);
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bool write(const char* data, unsigned int n);
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bool write(IPCMessage msgType);
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bool write(IPCMessage* msgType);
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bool write(const int* data);
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bool write(const unsigned int* data);
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bool write(const std::string* data);
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bool write(const bool* data);
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bool write(const double* data);
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bool read(IPCMessage* msgType);
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bool read(int* data);
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bool read(unsigned int* data);
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bool read(std::string* data);
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bool read(bool* data);
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bool read(double* data);
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bool read(IPCArray<double>* data);
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bool write(const IPCArray<double>* data);
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bool read(std::set<int>* data);
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bool write(const std::set<int>* data);
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IPCLoopBuffer* writeBuffer;
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IPCLoopBuffer* readBuffer;
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int connectionId;
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private:
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void* handle;
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char* sharedBuffer;
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bool server;
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bool connected;
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int ownerId;
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};
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class IPCGate {
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public:
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IPCGate(int id);
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~IPCGate();
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bool open();
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void close();
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IPCConnection* nextConnection();
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private:
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int id;
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IPCInit* initData;
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void* handle;
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char* sharedBuffer;
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};
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#endif /* IPC_H_ */
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