Apple

Hello all,

I want to create a kernel library supported c++ pure virtual function, and i had created kernel mode library , link to driver , and load driver , bring system crash.

the follow is my source code.

// class head file myclass.h

class MyClassBase
{
public:
     void * operator new(size_t size);
     void   operator delete(void * mem, size_t size);
    MyClassBase() {};
     virtual ~ MyClassBase() {};

     virtual void release() = 0;

public:
virtual void Enable(bool bEnable) = 0;
virtual void Process(float *pInBuf, float *pOutBuf, unsigned int len)=0;

};

class MyClass public: MyClassBase
{
private:

    unsigned int m_Val1, m_Val2;
    float        m_fVal[12];
     bool         m_bEnable;
public:

     void * operator new(size_t size);
     void   operator delete(void * mem, size_t size);

    MyClass();
     virtual ~ MyClass();

     virtual void release();

public:
virtual void Enable(bool bEnable);
virtual void Process(float *pInBuf, float *pOutBuf, unsigned int len);

};

// class source file myclass.cpp

// for Class MyClassBase
void * MyClassBase::operator new(size_t size)
{
     void *p = NULL;
     p = IOMalloc(size);
     return p;
}

void MyClassBase::operator delete(void * mem, size_t size)
{
     if(mem)
     {
         IOFree (mem, size);
     }
}

// for Class MyClass
void * MyClass::operator new(size_t size)
{
     void *p = NULL;
     p = IOMalloc(size);
     return p;
}

void MyClass::operator delete(void * mem, size_t size)
{
     if(mem)
     {
         IOFree (mem, size);
     }
}

MyClass:: MyClass()
{
     m_Val1 = 2;
     m_Val2 = 48000;
     m_bEnable = false;
}

MyClass::~ MyClass()
{
release();
}

void MyClass::release()
{
     m_Val1 = 2;
     m_Val2 = 48000;
     m_bEnable = false;
}

void MyClass::Enable(bool bEnable)
{
m_bEnable = bEnable;
}

void MyClass::Process(float *pInBuf, float *pOutBuf, unsigned int len)
{
     if(m_bEnable)
     {
      // process ...
     }
}

// used by driver
// Create
MyClass *myClsss = NULL;
myClsss = new MyClass();

    if(myClsss)
    {
         myClsss-> Enable(true);
    }

// Release
    if(myClsss)
    {
        delete myClsss;
    }
    myClsss = NULL;

//////////////// end /////////////////

This source code bring system crash, why ?

Thanks in advance.

　　　　　　 weifeng sui
email@hidden

　　　　　　　　　　　 2011-07-04