singleton.h

JAPAN RTOS TOPPERS/JSP kernel 1.4 PreRelease simulation environment JSP kernel Windows simulation

/*
 *  TOPPERS/JSP Kernel
 *      Toyohashi Open Platform for Embedded Real-Time Systems/
 *      Just Standard Profile Kernel
 * 
 *  Copyright (C) 2003 by Embedded and Real-Time Systems Laboratory
 *                              Toyohashi Univ. of Technology, JAPAN
 * 
 *  忋婰挊嶌尃幰偼丆埲壓偺 (1)乣(4) 偺忦審偐丆Free Software Foundation 
 *  偵傛偭偰岞昞偝傟偰偄傞 GNU General Public License 偺 Version 2 偵婰
 *  弎偝傟偰偄傞忦審傪枮偨偡応崌偵尷傝丆杮僜僼僩僂僃傾乮杮僜僼僩僂僃傾
 *  傪夵曄偟偨傕偺傪娷傓丏埲壓摨偠乯傪巊梡丒暋惢丒夵曄丒嵞攝晍乮埲壓丆
 *  棙梡偲屇傇乯偡傞偙偲傪柍彏偱嫋戻偡傞丏
 *  (1) 杮僜僼僩僂僃傾傪僜乕僗僐乕僪偺宍偱棙梡偡傞応崌偵偼丆忋婰偺挊嶌
 *      尃昞帵丆偙偺棙梡忦審偍傛傃壓婰偺柍曐徹婯掕偑丆偦偺傑傑偺宍偱僜乕
 *      僗僐乕僪拞偵娷傑傟偰偄傞偙偲丏
 *  (2) 杮僜僼僩僂僃傾傪丆儔僀僽儔儕宍幃側偳丆懠偺僜僼僩僂僃傾奐敪偵巊
 *      梡偱偒傞宍偱嵞攝晍偡傞応崌偵偼丆嵞攝晍偵敽偆僪僉儏儊儞僩乮棙梡
 *      幰儅僯儏傾儖側偳乯偵丆忋婰偺挊嶌尃昞帵丆偙偺棙梡忦審偍傛傃壓婰
 *      偺柍曐徹婯掕傪宖嵹偡傞偙偲丏
 *  (3) 杮僜僼僩僂僃傾傪丆婡婍偵慻傒崬傓側偳丆懠偺僜僼僩僂僃傾奐敪偵巊
 *      梡偱偒側偄宍偱嵞攝晍偡傞応崌偵偼丆師偺偄偢傟偐偺忦審傪枮偨偡偙
 *      偲丏
 *    (a) 嵞攝晍偵敽偆僪僉儏儊儞僩乮棙梡幰儅僯儏傾儖側偳乯偵丆忋婰偺挊
 *        嶌尃昞帵丆偙偺棙梡忦審偍傛傃壓婰偺柍曐徹婯掕傪宖嵹偡傞偙偲丏
 *    (b) 嵞攝晍偺宍懺傪丆暿偵掕傔傞曽朄偵傛偭偰丆TOPPERS僾儘僕僃僋僩偵
 *        曬崘偡傞偙偲丏
 *  (4) 杮僜僼僩僂僃傾偺棙梡偵傛傝捈愙揑傑偨偼娫愙揑偵惗偠傞偄偐側傞懝
 *      奞偐傜傕丆忋婰挊嶌尃幰偍傛傃TOPPERS僾儘僕僃僋僩傪柶愑偡傞偙偲丏
 * 
 *  杮僜僼僩僂僃傾偼丆柍曐徹偱採嫙偝傟偰偄傞傕偺偱偁傞丏忋婰挊嶌尃幰偍
 *  傛傃TOPPERS僾儘僕僃僋僩偼丆杮僜僼僩僂僃傾偵娭偟偰丆偦偺揔梡壜擻惈傕
 *  娷傔偰丆偄偐側傞曐徹傕峴傢側偄丏傑偨丆杮僜僼僩僂僃傾偺棙梡偵傛傝捈
 *  愙揑傑偨偼娫愙揑偵惗偠偨偄偐側傞懝奞偵娭偟偰傕丆偦偺愑擟傪晧傢側偄丏
 * 
 *  @(#) $Id: singleton.h,v 1.3 2003/07/08 08:00:19 takayuki Exp $
 */
// $Header: /home/CVS/configurator/base/singleton.h,v 1.3 2003/07/08 08:00:19 takayuki Exp $

#ifndef SINGLETON_H
#define SINGLETON_H

#ifdef _MSC_VER
#  pragma warning(disable:4290)	//C++ 偺椺奜偺巜掕偼柍帇偝傟傑偡丅娭悢偑 __declspec(nothrow) 偱側偄偙偲偺傒昞帵偝傟傑偡丅
#  pragma warning(disable:4291) //弶婜壔僐乕僪偑椺奜傪僗儘乕偡傞偲丄'new' 墘嶼巕傪巊梡偟偰偄傞偲儊儌儕傪夝曻偟傑偣傫丅 (懳嶔嵪傒)
#endif

//#include "base/testsuite.h"

#include <new>
#include <stdexcept>

/*
 *  僔儞僌儖僩儞僷僞乕儞 幚憰
 */
class SingletonBase {
public:
    struct chain {
        struct chain * next;
        void (*destructor)(void);
    };

		//僔儞僌儖僩儞偱僀儞僗僞儞僗傪惗惉偟偨偙偲傪帵偡偨傔偺僋儔僗
		//    偙偺僋儔僗偼Singleton偐傜偟偐幚懱壔偱偒側偄偺偱丄
		//    傎偐偺僋儔僗偐傜偙傟傪堷悢偵傕偮僐儞僗僩儔僋僞傪巊梡偡傞偙偲偼偱偒側偄
	class SingletonConstructionLocker
	{
	friend class SingletonBase;
	protected:
		SingletonConstructionLocker() {}
	};

private:
    static bool   initialize;
    static bool   is_valid;
    static struct chain * top;
    static struct chain * tail;

        //搊榐偝傟偰偄傞僔儞僌儖僩儞傪嶍彍偡傞
    static void final_release(void) throw();

protected:
        //僨僗僩儔僋僞偺捛壛
    static bool addDestructor(void (* destructor)(void)) throw();

		//SingletonConstructionLocker僼傽僋僩儕
	inline static SingletonConstructionLocker getLocker(void)
	{	return SingletonConstructionLocker();   }

public:
    inline static bool isValid(void) throw()
    {   return is_valid;   }

    //TESTSUITE_PROTOTYPE(main);
};


template<class T>
class Singleton : SingletonBase
{
protected:
    Singleton(void);
    ~Singleton(void);

    static T * instance;

    static void destructor(void) throw()
    {
        if(instance != 0) {
            delete instance;
            instance = 0;
        }
    }

    static T * createInstance(std::nothrow_t) throw()
    {
        T * instance = 0;
        try {
            instance = new(nothrow) T(getLocker());

            if(instance != 0) {
                if(!addDestructor(destructor))
                    throw false;    //catch愡傪幚峴偝偣偨偄
            }
        }
        catch(...) {
            if(instance != 0) {
                try { delete instance; } catch(...) {}
                instance = 0;
            }
        }
        return instance;
    }

    static T * createInstance(void) throw(std::bad_alloc)
    {
        instance = createInstance(nothrow);
        if(instance == 0)
            throw std::bad_alloc();
        return instance;
    }

public:
    inline static T * getInstance(void) throw(std::bad_alloc)
    {
        if(instance == 0)
            instance = createInstance();
        return instance;
    }

    inline static T * getInstance(std::nothrow_t) throw()
    {
        if(instance == 0)
            instance = createInstance(nothrow);
        return instance;
    }
};

template<class T> T *          Singleton<T>::instance        = 0;

#define SINGLETON_CONSTRUCTOR(x)  explicit x(const SingletonBase::SingletonConstructionLocker &)
#define SINGLETON_CONSTRUCTOR_(x) explicit x(const SingletonBase::SingletonConstructionLocker & _singleton)

#define SINGLETON_WRAPPER(derived, base) class derived : public base { SINGLETON_CONSTRUCTOR_(derived) throw() : base(_singleton) {} };

#endif /* SINGLETON_H */