Singleton template (二)

* implementation of ResGuard.
* See 
* by xiuleili 2013-7-5
*/ 
 
#pragma once  
#include   
 
 
// Instances of this class will be accessed by multiple threads. So,  
// all members of this class (except the constructor and destructor)  
// must be thread-safe.  
class ResGuard { 
public: 
    ResGuard()  { m_guardcount = 0; pthread_mutex_init(&m_cs, NULL); } 
    ~ResGuard() { pthread_mutex_destroy(&m_cs); } 
 
    // IsGuarded is used for debugging  
    bool isgurded() const { return(m_guardcount > 0); } 
 
public: 
    class Lock { 
    public: 
        Lock(ResGuard& rg) : m_rg(rg) { m_rg.Guard(); }; 
        ~Lock() { m_rg.Unguard(); } 
 
    private: 
        ResGuard& m_rg; 
    }; 
 
private: 
    void Guard()   { pthread_mutex_lock(&m_cs); m_guardcount++; } 
    void Unguard() { m_guardcount--; pthread_mutex_unlock(&m_cs); } 
 
    // Guard/Unguard can only be accessed by the nested Guard class.  
    friend class ResGuard::Lock; 
 
private: 
    pthread_mutex_t m_cs; 
    long m_guardcount;   // # of EnterCriticalSection calls  
}; 

/*
* implementation of ResGuard.
* See 
* by xiuleili 2013-7-5
*/

#pragma once
#include 


// Instances of this class will be accessed by multiple threads. So,
// all members of this class (except the constructor and destructor)
// must be thread-safe.
class ResGuard {
public:
 ResGuard()  { m_guardcount = 0; pthread_mutex_init(&m_cs, NULL); }
 ~ResGuard() { pthread_mutex_destroy(&m_cs); }

 // IsGuarded is used for debugging
 bool isgurded() const { return(m_guardcount > 0); }

public:
 class Lock {
 public:
  Lock(ResGuard& rg) : m_rg(rg) { m_rg.Guard(); };
  ~Lock() { m_rg.Unguard(); }

 private:
  ResGuard& m_rg;