WaitForSingleObject 无限等待,阻塞主线程

[tuoya220]

我在主界面点击按钮时弹出一个子界面，并开启一个线程，当我关闭子界面时，判断线程是否退出，如果没有退出，就用WaitForSingleObject(hThread_QAM,INFINITE); 进行等待，等到线程自己做完然后return.但是现在在这里wait变成无限等待了，主界面也一直阻塞住了...

CWinThread* wThread;
HANDLE hThread_QAM;

wThread = AfxBeginThread(theProc_QAM,NULL);
if( NULL != wThread)
{
hThread_QAM = wThread-> m_hThread;
}

UINT CQAMDlg::theProc_QAM(LPVOID p)
{
return m_pThis->QAM();
}

DWORD CQAMDlg::QAM()
{
if (INVALID_HANDLE_VALUE != hComm)
{
BOOL fWriteStat;
OVERLAPPED WRITE_OS;
CString m_addr;
int ItemCount = m_list.GetItemCount();

CriticalSection.Lock();
for (int Count = 0;Count < ItemCount;Count++)
{
//do sth;
}
CriticalSection.Unlock();
}
return 0;
}

void CQAMDlg::OnClose()
{
if(hThread_QAM)
{
DWORD exitcode1;
GetExitCodeThread(hThread_QAM,&exitcode1);
if(0 != exitcode1)
{
WaitForSingleObject(hThread_QAM,INFINITE); //现在也是无限等待了，不明白为什么啊...按理说它只会阻塞到我那边线程退出.
CloseHandle(hThread_QAM);
}
}
g_tip = "";
CDialog::OnClose();
}

[ArcRain]

CQAMDlg是主界面吧？在主界面里调用了OnClose()，然后WaitForSingleObject一直没返回当然就阻塞到了主界面了。
QAM()里的//do sth; 很耗时间？

[ArcRain]

子界面是个模态对话框？如果是这样的话，那么子界面不返回的话，主界面也就被阻塞了。
CQAMDlg::QAM()里的操作很耗时间？

[tuoya220]

to:dream238
CQAMDlg是弹出来的子界面，对
void CMainFrame::OnActiveRegister()
{
CQAMDlg qam;//这里调用的
qam.DoModal();
}
进入CQAMDlg以后才开的线程，现在就是阻塞在WaitForSingleObject上面，这里会无限等待，没有返回，但是实际上不应该是等到我的线程执行完就响应了吗？我线程又不是个while()循环....
CQAMDlg::QAM()这里面是读写寄存器的操作，大概要10多秒吧

[tuoya220]

to:dream238
对，是模态对话框
void CMainFrame::OnActiveRegister()
{
CQAMDlg qam;
qam.DoModal();
}
问题是我在子界面OnClose()的时候，会阻塞在WaitForSingleObject（），这里会无限等待，整个线程都被卡死了.按理说它应该在我线程执行完成后就响应的.
CQAMDlg::QAM()是读写寄存器的操作，大概会消耗10几秒

[Eleven]

你用非模态对话框

[Eleven]

你用非模态对话框

[tuoya220]

to VisualEleven:

void CMainFrame::OnActiveRegister()
{
/*CQAMDlg qam;
qam.DoModal();*/
CQAMDlg *qam;
qam = new CQAMDlg;
qam->Create(IDD_DIALOG_QAMREGS);
qam->ShowWindow(TRUE);
}

void CQAMDlg::OnClose()
{
if(hThread_QAM)
{
DWORD exitcode1;
GetExitCodeThread(hThread_QAM,&exitcode1);
if(0 != exitcode1)
{
WaitForSingleObject(hThread_QAM,INFINITE); //无限等待了
CloseHandle(hThread_QAM);
}
}
g_tip = "";
CDialog::OnClose();
}

一样卡住....WaitForSingleObject()...

[tuoya220]

to VisualEleven：
void CMainFrame::OnActiveRegister()
{
/*CQAMDlg qam;
qam.DoModal();*/
CQAMDlg *qam;
qam = new CQAMDlg;
qam->Create(IDD_DIALOG_QAMREGS);
qam->ShowWindow(TRUE);
}

void CQAMDlg::OnClose()
{
if(hThread_QAM)
{
DWORD exitcode1;
GetExitCodeThread(hThread_QAM,&exitcode1);
if(0 != exitcode1)
{
WaitForSingleObject(hThread_QAM,INFINITE); //阻塞了
CloseHandle(hThread_QAM);
}
}
g_tip = "";
CDialog::OnClose();
}

依旧阻塞中....WaitForSingleObject()一直无限等待了

[tuoya220]

但是如果在
void CQAMDlg::OnClose()
{
g_tip = "";
CDialog::OnClose();
}
不等待，退出就没问题，线程会在后台自己运行，一直到执行完毕后return掉.