多线程示例(二) 用事件使线程同步

野性酷女 2022-08-14 04:39 99阅读 0赞

// ComputeDialog.cpp : 实现文件 // \#include "stdafx.h" \#include "Ex13.h" \#include "ComputeDialog.h" CEvent g\_eventStart; CEvent g\_eventKill; int g\_nCount = 0; UINT ComputeThreadProc(LPVOID pParam) \{ volatile int nTemp; ::WaitForSingleObject(g\_eventStart, INFINITE); for (g\_nCount = 0; g\_nCount < CComputeDialog::nMaxCount; g\_nCount++) \{ for (nTemp = 0; nTemp < 100000; ++nTemp) \{ \} if (::WaitForSingleObject(g\_eventKill, 0) == WAIT\_OBJECT\_0) \{ break; \} \} ::PostMessage((HWND)pParam, WM\_THREADFINISHED, 0, 0); g\_nCount = 0; return 0; \} // CComputeDialog 对话框 IMPLEMENT\_DYNAMIC(CComputeDialog, CDialog) CComputeDialog::CComputeDialog(CWnd\* pParent /\*=NULL\*/) : CDialog(CComputeDialog::IDD, pParent) \{ \} CComputeDialog::~CComputeDialog() \{ \} void CComputeDialog::DoDataExchange(CDataExchange\* pDX) \{ CDialog::DoDataExchange(pDX); \} BEGIN\_MESSAGE\_MAP(CComputeDialog, CDialog) ON\_BN\_CLICKED(IDC\_START, &CComputeDialog::OnBnClickedStart) ON\_BN\_CLICKED(IDC\_CANCEL, &CComputeDialog::OnBnClickedCancel) ON\_WM\_TIMER() ON\_MESSAGE(WM\_THREADFINISHED, OnThreadFinished) END\_MESSAGE\_MAP() LRESULT CComputeDialog::OnThreadFinished(WPARAM wParam, LPARAM lParam) \{ //GetDlgItem(IDC\_START)->EnableWindow(TRUE); //KillTimer(1); CDialog::OnOK(); //return 0; // return 0; \} // CComputeDialog 消息处理程序 void CComputeDialog::OnBnClickedStart() \{ m\_nTimer = SetTimer(1, 100, NULL); ASSERT(m\_nTimer != 0); GetDlgItem(IDC\_START)->EnableWindow(FALSE); g\_eventStart.SetEvent(); \} void CComputeDialog::OnBnClickedCancel() \{ g\_eventKill.SetEvent(); \} void CComputeDialog::OnTimer(UINT\_PTR nIDEvent) \{ CProgressCtrl\* pBar = (CProgressCtrl\*) GetDlgItem(IDC\_PROGRESS1); pBar->SetPos(g\_nCount\*100 / nMaxCount); CDialog::OnTimer(nIDEvent); \} BOOL CComputeDialog::OnInitDialog() \{ CDialog::OnInitDialog(); // TODO: 在此添加额外的初始化 AfxBeginThread(ComputeThreadProc, GetSafeHwnd()); return TRUE; // return TRUE unless you set the focus to a control // 异常: OCX 属性页应返回 FALSE \}