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78 lines
2.6 KiB
C
78 lines
2.6 KiB
C
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/***************************************************************************
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rlsharedmemory.h - description
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-------------------
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begin : Tue Jan 02 2001
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copyright : (C) 2001 by R. Lehrig
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email : lehrig@t-online.de
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***************************************************************************/
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/***************************************************************************
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* *
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* This library is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU LESSER GENERAL PUBLIC LICENSE as *
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* published by the Free Software Foundation *
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* *
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***************************************************************************/
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#ifndef _RL_SHARED_MEMORY_H_
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#define _RL_SHARED_MEMORY_H_
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#include "rldefine.h"
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#include "rlwthread.h"
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/*! <pre>
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class for a shared memory.
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A shared memory is a piece of RAM that is shared between processes.
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If many processes have access to the same RAM, it is necessary to lock the shared memory.
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The read/write methods will do this and copy the data to local data.
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If you want direct access, you may use getUserAdr().
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</pre> */
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class rlSharedMemory
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{
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public:
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enum SharedMemoryEnum
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{
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OK = 0,
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ERROR_FILE,
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ERROR_SHMGET,
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ERROR_SHMAT,
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ERROR_SHMCTL
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};
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/*! rwmode := access rights under unix. default 0600 user=read,write */
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rlSharedMemory(const char *name, unsigned long size, int rwmode=0600);
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virtual ~rlSharedMemory();
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int deleteSharedMemory();
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int write(unsigned long offset, const void *buf, int len);
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int read (unsigned long offset, void *buf, int len);
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int readInt(unsigned long offset, int index);
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int readShort(unsigned long offset, int index);
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int readByte(unsigned long offset, int index);
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float readFloat(unsigned long offset, int index);
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int writeInt(unsigned long offset, int index, int val);
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int writeShort(unsigned long offset, int index, int val);
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int writeByte(unsigned long offset, int index, unsigned char val);
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int writeFloat(unsigned long offset, int index, float val);
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void *getUserAdr();
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int shmKey();
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int shmId();
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unsigned long size();
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int status;
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char *name;
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private:
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int id;
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int shmkey;
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char *base_adr;
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char *user_adr;
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unsigned long _size;
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pthread_mutex_t *mutex;
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#ifdef RLWIN32
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HANDLE hSharedFile;
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OVERLAPPED overlapped;
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#elif defined(RLUNIX)
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int fdlock;
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#endif
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};
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#endif
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