sem.h

一套linux下的C++开发库

/***************************************************************************
                          sem.h  -  description
                             -------------------
    begin                : Fri Jul 20 2001
    copyright            : (C) 2001 by Mark
    email                : [e-mail]
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   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.                                   *
 *                                                                         *
 ***************************************************************************/


#ifndef SEM_H
#define SEM_H

#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/sem.h>

#include <tinycxx/exception.h>

#if defined(__GNU_LIBRARY__) && !defined(_SEM_SEMUN_UNDEFINED)
/* union semun is defined by including <sys/sem.h> */
#else
/* according to X/OPEN we have to define it ourselves */
union semun {
  int val;                    /* value for SETVAL */
  struct semid_ds *buf;       /* buffer for IPC_STAT, IPC_SET */
  unsigned short int *array;  /* array for GETALL, SETALL */
  struct seminfo *__buf;      /* buffer for IPC_INFO */
};
#endif


class CSem
{
protected:
	int m_iSems;
	int m_iSemId;
	key_t m_tKey;
	bool m_bCreate;

public: 
	CSem(key_t tKey, int iSems = 1, int iMode = 0600);
	virtual ~CSem();
	
	void GetSem(int iMode = 0600);
	void RemoveSem();
	bool Lock();
	void Unlock();
	bool SemOpWithUndo(int iSems, ...);
	bool SemOp(int iSems, ...);
	void SetAll(int iSems, ...);
	void SetValue(int iSemNum, int iValue);
	void GetAll(unsigned short int* pusiArray);
	int GetValue(int iSemNum);
	bool IfCreate() { return m_bCreate; }
	void InitSem();
};
	
#endif