Simple Multithreading in C++ / MFC

Right now I am just starting with a very simple example - no fancy stuff - just a single thread to demonstrate a sequence that updates a counter 20 times per second. [code language="cpp"] //---- First example: Using global vars and fn int gnCurValue; int gnMaxValue; BOOL gfStopNow; UINT MyThreadProc( LPVOID pParam ) { while ( !gfStopNow && (gnCurValue < gnMaxValue) ) { gnCurValue++; Sleep( 50 ); // would do some work here } return(1); } void CThreadDlg::OnBnClickedStart() { gnCurValue= 0; gnMaxValue= 5000; gfStopNow= 0; m_ctlStatus.SetWindowText("Starting..."); SetTimer( 1234, 333, 0 ); // 3 times per second AfxBeginThread( MyThreadProc, 0 ); // <<== START THE THREAD } void CThreadDlg::OnBnClickedStop() { gfStopNow= TRUE; KillTimer( 1234 ); m_ctlStatus.SetWindowText( "STOPPED" ); } void CThreadDlg::OnTimer(UINT_PTR nIDEvent) { CString sStatusMsg; sStatusMsg.Format("Running: %d", gnCurValue ); m_ctlStatus.SetWindowText( sStatusMsg ); CDialog::OnTimer(nIDEvent); } [/code] Sample Visual Studio 2003 code here: Thread.zip

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