jsharedfifo.h
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/***************************************************************************
* Copyright (C) 2005 by Jeff Ferr *
* root@sat *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* This program 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 General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
***************************************************************************/
#ifndef J_SHAREDFIFO_H
#define J_SHAREDFIFO_H
#include "jobject.h"
#include <iostream>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <stdint.h>
namespace jshared {
struct jshmhandle_t {
int sid;
void *mem;
int privsz; // size of single priv structure of upper program
int semid; // semaphore id
int sz; // size of shared mem in bytes
};
struct jshmprefix_t {
int counter;
int read; // offsets from shm->mem where we should read and write
int write; // min value for both is shm->privsz+sizeof(struct shmprefix)
};
struct jshmbh_t {
int sz;
unsigned canary;
};
/**
* \brief Socket.
*
* \author Jeff Ferr
*/
class SharedFifo : public virtual jcommon::Object{
private:
struct jshmhandle_t *_shm;
/**
* \brief
*
*/
void LLHRewind();
/**
* \brief
*
*/
int LLMemFree();
/**
* \brief
*
*/
int LLMemUsed();
/**
* \brief
*
*/
int LLPut(void *data, int sz);
/**
* \brief
*
*/
int LLGet(void *data, int sz);
/**
* \brief
*
*/
void Lock();
/**
* \brief
*
*/
void Unlock();
public:
/**
* \brief Constructor.
*
*/
#ifdef _WIN32
SharedFifo(int key_, int npages_, int struct_size_);
#else
SharedFifo(key_t key_, int npages_, int struct_size_);
#endif
/**
* \brief Destrutor virtual.
*
*/
virtual ~SharedFifo();
/**
* \brief
*
*/
void Attach();
/**
* \brief
*
*/
void Dealloc();
/**
* \brief
*
*/
void Detach();
/**
* \brief
*
*/
void Setpriv(void *priv);
/**
* \brief
*
*/
void Getpriv(void *priv);
/**
* \brief
*
*/
int Get(void *data,int sz);
/**
* \brief
*
*/
int Put(void *data, int sz);
/**
* \brief
*
*/
bool IsEmpty();
/**
* \brief Close.
*
*/
void Close();
};
}
#endif