多线程下使用CloseHandle关闭串口导致阻塞怎么解决

//执行Dlg工作线程

static DWORD WINAPI RunCmcucontrollerDlg_Thread(LPVOID arg)

{

	CmcucontrollerDlg *dlg = (CmcucontrollerDlg *)arg;



	return dlg->uartWorkThread();

}

	//创建信号量

	this->readSem = CreateSemaphore(0, 0, 1, 0);

	if (this->readSem == NULL)

	{

		CString str;

		DWORD errCode;



		errCode = GetLastError();

		str.Format(L"创建信号量失败，错误(%d)：%s", errCode, GetLastErrorToString(errCode));

		::MessageBox(0, str, L"初始化失败", MB_OK);



		AfxGetMainWnd()->SendMessage(WM_CLOSE);

		return FALSE;

	}



	//创建工作线程

	uartWorkHandle = CreateThread(NULL, 0, RunCmcucontrollerDlg_Thread, (LPVOID)this, 0, &uartWorkThreadId);

	if (uartWorkHandle == NULL)

	{

		CString str;

		DWORD errCode;



		errCode = GetLastError();

		str.Format(L"创建工作线程失败，错误(%d)：%s", errCode, GetLastErrorToString(errCode));

		::MessageBox(0, str, L"初始化失败", MB_OK);



		AfxGetMainWnd()->SendMessage(WM_CLOSE);

	}

	//打开串口

	this->uartHandle = CreateFileW(str,

		GENERIC_READ | GENERIC_WRITE,

		0,

		NULL,

		OPEN_EXISTING,

		0,

		NULL);

	if (!this->uartHandle || this->uartHandle == INVALID_HANDLE_VALUE)

	{

		this->uartHandle = 0;

		errCode = GetLastError();

		str.Format(L"串口打开失败，错误(%d)：%s", errCode, GetLastErrorToString(errCode));

		::MessageBox(0, str, L"打开失败", MB_OK);

		return;

	}



	//设置串口参数

	errCode = SetUartParam(this->uartHandle,

					baudrate,

					dataBits,

					parityCheck,

					stopBits);

	if (errCode)

	{

		CloseHandle(this->uartHandle);

		this->uartHandle = 0;



		str.Format(L"串口参数设置失败，错误(%d)：%s", errCode, GetLastErrorToString(errCode));

		::MessageBox(0, str, L"串口设置失败", MB_OK);

		return;

	}



	//通知线程接收数据

	::ReleaseSemaphore(this->readSem, 1, NULL);

DWORD CmcucontrollerDlg::uartWorkThread()

{

	HWND hwnd = this->GetSafeHwnd();



	while (1)

	{

		WaitForSingleObject(this->readSem, INFINITE);

		if (this->uartWorkerTheadExit)

		{

			break;

		}



		//读取串口

		if (ReadFile(this->uartHandle, this->recvBuffer, sizeof(this->recvBuffer), &this->recvCount, NULL))

		{

			this->recvError = 0;

		}

		else

		{

			this->recvError = GetLastError();

		}



		//通知主线程

		::PostMessage(hwnd, WM_ON_UART_READ, 0, 0);

	}



	return 0;

}

	//关闭串口

	if (this->uartHandle)

	{

		CloseHandle(this->uartHandle);

		this->uartHandle = NULL;



		openButton->SetWindowTextW(L"打开");

		portsBox->EnableWindow(true);

		baudrateBox->EnableWindow(true);

		dataBitsBox->EnableWindow(true);

		parityCheckBox->EnableWindow(true);

		stopBitsBox->EnableWindow(true);

		dataTimeoutBox->EnableWindow(true);

	}