RE: Using std::cin.rdbuf()->in_avail()

Hi Paul,
I am sorry for this late response due to asking for two days sick leave.

From my research, I just found one way to resolve this issue.
The basic idea is as following:
1. Use a global flag to represent one thread execution status;
2. Use another thread to monitor this flag;
3. Exit the process if the flag has been changed to finished status.

Please refer to the following code:
#include <windows.h>

static int flag = 0;

class CWorker
{
private:
    HANDLE m_handle;
    DWORD m_thdId;
    LPTHREAD_START_ROUTINE m_thd_routine;
public:
    CWorker(LPTHREAD_START_ROUTINE thdproc)
    {
        m_thd_routine = thdproc;

    }

    HANDLE getThreadHandle()
    {
        return m_handle;
    }

    void start(){
        m_handle = CreateThread(NULL,0,m_thd_routine,NULL,NULL,&m_thdId);
    }

    void stop(){
        SuspendThread(m_handle);
    }

    void resume()
    {
        ResumeThread(m_handle);
    }

    void exit()
    {
        DWORD nCode = 0;
        GetExitCodeThread(m_handle, &nCode);
        CloseHandle(m_handle);
        ExitThread(nCode);
    }

};

DWORD WINAPI Thread1(LPVOID lpParameter)
{
    Sleep(5000);
    std::cout<<"Thread1 ended!"<<endl;
    flag = 1;
    return 0;
};

DWORD WINAPI MonitorForExit(LPVOID lpParameter)
{
    while(1)
    {
        if(flag==1)
            ExitProcess(0);
    }
    return 0;
};

void main(int argc, char* argv[])
{
    MSG msg;
    char ch;
    CWorker workerTask(Thread1);
    CWorker workerMonitor(MonitorForExit);
    workerMonitor.start();
    while (std::cin >> ch) {
        switch(ch)
        {
            case 's':
            case 'S':
                workerTask.start();
                break;
            case 'P':
            case 'p':
                workerTask.stop();
                std::cout<< "Enter choice: 'R' - resume, 'Q' - quit: ";
                break;
            case 'R':
            case 'r':
                workerTask.resume();
                std::cout << "Enter choice: 'P' - pause, 'Q' - quit: ";
                break;
            case 'Q':
            case 'q':
                return;
            default:
                std::cerr << "Unknown choice. Try again.\n";
        }
    }

}

Hope this helps. Please feel free to let me know if you have any other
questions or concerns.
It is always my pleasure to be of assistance.

Sincerely yours,
Charles Wang
Microsoft Online Community Support

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