Multithread heap assertion failure(Continued)

From:

Zhiguo <ZhiguoYoung@gmail.com>

Newsgroups:

microsoft.public.vc.mfc

Date:

Thu, 09 Aug 2007 19:16:01 -0700

Message-ID:

<1186712161.037642.210720@d30g2000prg.googlegroups.com>

I create a win32 console project with mfc support(shared dll) using
VS2003, and add the following source file to my project.

When run, there is "debug assertion failure" error around here in
thrdcore.cpp:
--------------
// check to make sure the VTable pointer is valid
    ASSERT(sizeof(CObject) == sizeof(void*));
    if (!AfxIsValidAddress(*(void**)pOb, sizeof(void*), FALSE))
    {
        TRACE(traceAppMsg, 0, "ASSERT_VALID fails with illegal vtable
pointer.\n");
        if (AfxAssertFailedLine(lpszFileName, nLine))
            AfxDebugBreak();
        return; // quick escape
    }
--------------
The exact position is at "AfxDebugBreak()" in the deepest place.

Having programmed for years, I am still new to multithreaded
programming.
I would usually refer to docs when I have something to check.
But, as for multithread programming, I don't know what is going
wrong.
And I don't know which part of mannual should I read.
I have to ask you for help.

*Any help will be appreciated. Thanks in advance.*

Here is the call stack:
---------------
    mfc71d.dll!AfxAssertValidObject(const CObject * pOb=0x00a555f4, const
char * lpszFileName=0x7c15264c, int nLine=375) =D0=D092 C++
mfc71d.dll!AfxEndThread(unsigned int nExitCode=1, int bDelete=1) =D0=
=D0
376 C++
mfc71d.dll!_AfxThreadEntry(void * pParam=0x0013fd98) =D0=D0134 C++
msvcr71d.dll!_threadstartex(void * ptd=0x00a55810) =D0=D0241 + 0xd C
kernel32.dll!7c80b683()

And Here is the source file:
---------------
#include <afx.h>
#include <afxmt.h>
#include <afxwin.h> // MFC core and standard components
#include <windows.h>

#include <iostream>
using namespace std;

class CTestThread: public CWinThread{
public:
    long timeout;

    CTestThread(){}
    virtual ~CTestThread(){}

    int Run(){
        cout << "run..." << endl;
        Sleep(timeout);
        return 1;
    }

    BOOL InitInstance(){
        cout << "init..." << endl;
        return TRUE;
    }

    int ExitInstance(){
        cout << "exit inst..." << endl;
        return 0;
    }
};

int main(){
    int nWorkerNum = 2;
    CTestThread * m_pThread = new CTestThread[nWorkerNum];
    HANDLE * m_pThreadHandle = new HANDLE[nWorkerNum];
    for(int i = 0; i < nWorkerNum; i ++){
        m_pThread[i].CreateThread();
        m_pThread[i].m_bAutoDelete = FALSE;
        m_pThreadHandle[i] = m_pThread[i].m_hThread;
    }
    m_pThread[0].timeout = 1;
    m_pThread[1].timeout = 3000;
    WaitForMultipleObjects(nWorkerNum, m_pThreadHandle, FALSE, INFINITE);
    cout << "here" << endl; cout.flush();
    clock_t s = clock();
    WaitForMultipleObjects(nWorkerNum, m_pThreadHandle, TRUE, 2500);
    clock_t e = clock();
    cout << "####" << (e - s) << endl;
    cout << "there" << endl; cout.flush();

    for(int i = 0; i < nWorkerNum; i ++){
        m_pThread[i].ExitInstance();
    }

    delete [] m_pThreadHandle;
    delete [] m_pThread;

    cout << "Press c to conitnue..." << endl;
    cout.flush();
    char c; cin >> c;
}