I’m using MFC threading:
both main thread and worker thread are using the same function ReceiveResponse().
and I change myMaster->configDone so that the worker thread executes different work based on myMaster->configDone value.
the problem is that I may change myMaster->configDone value in my main thread, but the worker thread sometimes would receive data even when the myMaster->configDone != tComSts::COM_CFG_DONE. in my opinion because it hasnt finish the loop before that the main thread changed the value of myMaster->configDone.
what should I do in this case please?

#include <afxwin.h>
#include <afxmt.h>

#define THREAD_DELAY_MS 100

class myClass;

WorkerThread::WorkerThread(myClass *pClassSession)
    : m_pSession(pSession), m_hThread(nullptr)
{
}

WorkerThread::~WorkerThread()
{
}

BOOL WorkerThread::InitInstance()
{  
m_hThread = AfxBeginThread(ThreadFunction, m_pSession, THREAD_PRIORITY_NORMAL, CREATE_SUSPENDED);

    m_hThread->m_bAutoDelete = FALSE;

    return TRUE;
}

int WorkerThread::ExitInstance()
{
    return CWinThread::ExitInstance();
}

using ModeFieldBits = SetDaqListModePacket::ModeFieldBits;

UINT WorkerThread::ThreadFunction(LPVOID pParam)
{
    myClass *myMaster = reinterpret_cast<myClass *>(pParam);

    if (nullptr != myMaster)
    {
        while (true)
        {
            if (tComSts::COM_CFG_DONE == myMaster->configDone)
            {
                st_msg rmsg = {0};
                myMaster->ReceiveResponse(true, TIMEOUT_RECEIVE, &rmsg);
            }
            else if (tComSts::COM_CFG_NONE == myMaster->configDone)
            {
                //do some work
            }
            else
            {
                //do nothing
            }
        }
    }

    return 0;
}