求助，关于编译运内存指令引用错误read不能怎样解决？

[shaowenhua86]

调试时出现提示框：“0x00404556”指令引用的“0x00000000”内存。该内存不能为“read”

程序是vc++深入详解视频第15课时的
#include<windows.h>
#include<iostream.h>

DWORD WINAPI Fun1Proc(
LPVOID lpParameter // thread data
);
DWORD WINAPI Fun2Proc(
LPVOID lpParameter // thread data
);
int index=0;
int tickets=100;
void main()
{
HANDLE hThread1,hThread2;
hThread1=CreateThread(NULL,0,Fun1Proc,NULL,0,NULL);
hThread2=CreateThread(NULL,0,Fun2Proc,NULL,0,NULL);
CloseHandle(hThread1);
CloseHandle(hThread2);
/*while(index++<100)
cout<<"main thread is runing"<<endl;*/
//Sleep(10);
Sleep(4000);
}



DWORD WINAPI Fun1Proc(
LPVOID lpParameter // thread data
)
{
/*while(index++<100)
cout<<"thread1 is runing"<<endl;*/
while(1)
{
if(tickets>0)
cout<<"thread1 sell ticket:"<<tickets--<<endl;
else
break;
}
return 0;
}


DWORD WINAPI Fun2Proc(
LPVOID lpParameter // thread data
)
{
while(1)
{
if(tickets>0)
cout<<"thread2 sell ticket:"<<tickets--<<endl;
else
break;
}

return 0;
}

[jackzhhuang]

在哪里崩？？

tickets没有做同步访问，很可能自减还没操作完成就被打断。

[老邓]

没崩溃啊。
VC10

#include <iostream>
#include <string>

using namespace std;

#include <windows.h>

DWORD WINAPI Fun1Proc(LPVOID lpParameter // thread data
    );
DWORD WINAPI Fun2Proc(LPVOID lpParameter // thread data
    );
int index = 0;
int tickets = 100;
void main()
{
    HANDLE hThread1, hThread2;
    hThread1 = CreateThread(NULL, 0, Fun1Proc, NULL, 0, NULL);
    hThread2 = CreateThread(NULL, 0, Fun2Proc, NULL, 0, NULL);
    CloseHandle(hThread1);
    CloseHandle(hThread2);
    /*while(index++ <100)
     cout < <"main thread is runing" < <endl;*/
    //Sleep(10);
    Sleep(4000);
}

DWORD WINAPI Fun1Proc(LPVOID lpParameter // thread data
)
{
    /*while(index++ <100)
     cout < <"thread1 is runing" < <endl;*/
    while (1)
    {
        if (tickets > 0) cout << "thread1 sell ticket:" << tickets-- << endl;
        else break;
    }
    return 0;
}

DWORD WINAPI Fun2Proc(LPVOID lpParameter // thread data
)
{
    while (1)
    {
        if (tickets > 0) cout << "thread2 sell ticket:" << tickets-- << endl;
        else break;
    }

    return 0;
}

[老邓]

给你加了个锁，你跑跑看：

#include <windows.h>

class CriticalSection
{
public:
    CriticalSection() { ::InitializeCriticalSection(&m_cs); }
    virtual ~CriticalSection() { ::DeleteCriticalSection(&m_cs); }
    void Lock() { ::EnterCriticalSection(&m_cs); }
    void Unlock() { ::LeaveCriticalSection(&m_cs); }
    operator PCRITICAL_SECTION() { return &m_cs; }

protected:
    CRITICAL_SECTION m_cs;
};

class Locker
{
public:
    Locker(PCRITICAL_SECTION cs) : m_p(cs) { ::EnterCriticalSection(m_p); }
    ~Locker() { ::LeaveCriticalSection(m_p); }

protected:
    PCRITICAL_SECTION m_p;
};

CriticalSection cs;

DWORD WINAPI Fun1Proc(LPVOID lpParameter // thread data
    );
DWORD WINAPI Fun2Proc(LPVOID lpParameter // thread data
    );
int index = 0;
int tickets = 100;
void main()
{
    HANDLE hThread1, hThread2;
    hThread1 = CreateThread(NULL, 0, Fun1Proc, NULL, 0, NULL);
    hThread2 = CreateThread(NULL, 0, Fun2Proc, NULL, 0, NULL);
    CloseHandle(hThread1);
    CloseHandle(hThread2);
    /*while(index++ <100)
     cout < <"main thread is runing" < <endl;*/
    //Sleep(10);
    Sleep(4000);
}

DWORD WINAPI Fun1Proc(LPVOID lpParameter // thread data
)
{
    /*while(index++ <100)
     cout < <"thread1 is runing" < <endl;*/
    while (1)
    {
        Locker lock(cs);
        if (tickets > 0) cout << "thread1 sell ticket:" << tickets-- << endl;
        else break;
    }
    return 0;
}

DWORD WINAPI Fun2Proc(LPVOID lpParameter // thread data
)
{
    while (1)
    {
        Locker lock(cs);
        if (tickets > 0) cout << "thread2 sell ticket:" << tickets-- << endl;
        else break;
    }

    return 0;
}