C++線程同步之事件

題目要求:點擊搶紅包後,先將第一個編輯框的值設置爲1000,而後建立三個線程,讓右邊的編輯框值依次設置爲1000(用事件完成)框架

// MutexExDlg.h : 頭文件
//

#pragma once


// CMutexExDlg 對話框
class CMutexExDlg : public CDialogEx
{
// 構造
public:
    CMutexExDlg(CWnd* pParent = NULL);    // 標準構造函數

// 對話框數據
    enum { IDD = IDD_MUTEXEX_DIALOG };

    protected:
    virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV 支持
    static HANDLE hThread[3];
    static HANDLE m_Mutex;
    static HANDLE m_Event;
    static DWORD WINAPI ThreadProc0(LPVOID lpParameter);
    static DWORD WINAPI ThreadProc1(LPVOID lpParameter);
    static DWORD WINAPI ThreadProc2(LPVOID lpParameter);
    static DWORD WINAPI ThreadProc3(LPVOID lpParameter);


// 實現
protected:
    HICON m_hIcon;

    // 生成的消息映射函數
    virtual BOOL OnInitDialog();
    afx_msg void OnPaint();
    afx_msg HCURSOR OnQueryDragIcon();
    DECLARE_MESSAGE_MAP()
public:
    virtual BOOL PreTranslateMessage(MSG* pMsg);
    afx_msg void OnBnClickedButton1();
    static int m_Edit0;
    static int m_Edit1;
    static int m_Edit2;
    static int m_Edit3;
};
// MutexExDlg.cpp : 實現文件
//

#include "stdafx.h"
#include "MutexEx.h"
#include "MutexExDlg.h"
#include "afxdialogex.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#endif


// CMutexExDlg 對話框



CMutexExDlg::CMutexExDlg(CWnd* pParent /*=NULL*/)
    : CDialogEx(CMutexExDlg::IDD, pParent)
{
    m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CMutexExDlg::DoDataExchange(CDataExchange* pDX)
{
    CDialogEx::DoDataExchange(pDX);
    DDX_Text(pDX, IDC_EDIT1, m_Edit0);
    DDV_MinMaxInt(pDX, m_Edit0, 0, 1000);
    DDX_Text(pDX, IDC_EDIT2, m_Edit1);
    DDV_MinMaxInt(pDX, m_Edit1, 0, 1000);
    DDX_Text(pDX, IDC_EDIT3, m_Edit2);
    DDV_MinMaxInt(pDX, m_Edit2, 0, 1000);
    DDX_Text(pDX, IDC_EDIT4, m_Edit3);
    DDV_MinMaxInt(pDX, m_Edit3, 0, 1000);
}

BEGIN_MESSAGE_MAP(CMutexExDlg, CDialogEx)
    ON_WM_PAINT()
    ON_WM_QUERYDRAGICON()
    ON_BN_CLICKED(IDC_BUTTON1, &CMutexExDlg::OnBnClickedButton1)
END_MESSAGE_MAP()


// CMutexExDlg 消息處理程序

BOOL CMutexExDlg::OnInitDialog()
{
    CDialogEx::OnInitDialog();

    // 設置此對話框的圖標。  當應用程序主窗口不是對話框時,框架將自動
    //  執行此操做
    SetIcon(m_hIcon, TRUE);            // 設置大圖標
    SetIcon(m_hIcon, FALSE);        // 設置小圖標

    // TODO:  在此添加額外的初始化代碼

    return TRUE;  // 除非將焦點設置到控件,不然返回 TRUE
}

// 若是向對話框添加最小化按鈕,則須要下面的代碼
//  來繪製該圖標。  對於使用文檔/視圖模型的 MFC 應用程序,
//  這將由框架自動完成。

void CMutexExDlg::OnPaint()
{
    if (IsIconic())
    {
        CPaintDC dc(this); // 用於繪製的設備上下文

        SendMessage(WM_ICONERASEBKGND, reinterpret_cast<WPARAM>(dc.GetSafeHdc()), 0);

        // 使圖標在工做區矩形中居中
        int cxIcon = GetSystemMetrics(SM_CXICON);
        int cyIcon = GetSystemMetrics(SM_CYICON);
        CRect rect;
        GetClientRect(&rect);
        int x = (rect.Width() - cxIcon + 1) / 2;
        int y = (rect.Height() - cyIcon + 1) / 2;

        // 繪製圖標
        dc.DrawIcon(x, y, m_hIcon);
    }
    else
    {
        CDialogEx::OnPaint();
    }
}

//當用戶拖動最小化窗口時系統調用此函數取得光標
//顯示。
HCURSOR CMutexExDlg::OnQueryDragIcon()
{
    return static_cast<HCURSOR>(m_hIcon);
}


// 重寫虛函數 PreTranslateMessage 屏蔽掉Esc鍵和Enter鍵
BOOL CMutexExDlg::PreTranslateMessage(MSG* pMsg)
{
    if (pMsg->message == WM_KEYDOWN)
    {
        int keyCode = (int)pMsg->wParam;
        if (keyCode == VK_ESCAPE || keyCode == VK_RETURN)
        {
            return TRUE;
        }
    }
    return CDialogEx::PreTranslateMessage(pMsg);
}

HANDLE CMutexExDlg::m_Mutex = NULL;
HANDLE CMutexExDlg::m_Event = NULL;
int CMutexExDlg::m_Edit0 = 0;
int CMutexExDlg::m_Edit1 = 0;
int CMutexExDlg::m_Edit2 = 0;
int CMutexExDlg::m_Edit3 = 0;
HANDLE CMutexExDlg::hThread[3] = { NULL };

// 搶紅包按鈕點擊事件處理函數
void CMutexExDlg::OnBnClickedButton1()
{
    // 獲取編輯框內容到str變量
    CString str;
    GetDlgItem(IDC_EDIT1)->GetWindowText(str);
    // CString 轉 int
    m_Edit0 = _ttoi(str);
    m_Edit1 = 0;
    m_Edit2 = 0;
    m_Edit3 = 0;
    // 這裏須要建立一個線程 由於 WaitForMultipleObjects 會阻塞住 另外把this指針做爲參數傳遞給線程,用於子線程更新編輯框內容
    HANDLE hThread0 = ::CreateThread(NULL, NULL, ThreadProc0, this, NULL, NULL);
    CloseHandle(hThread0);
}

DWORD WINAPI CMutexExDlg::ThreadProc0(LPVOID lpParameter)
{
    CMutexExDlg* pDlg = (CMutexExDlg*)lpParameter;
    // 建立一個事件
    m_Event = ::CreateEvent(NULL,
        FALSE, // FALSE 表明 WaitForSingleObject到以後,事件仍是未通知狀態,須要手動設置已通知狀態
        FALSE,  // FALSE 表明 事件建立完以後,不能立刻被 WaitForSingleObject 到
        NULL);
    // 建立三個線程搶紅包
    hThread[0] = ::CreateThread(NULL, NULL, ThreadProc1, lpParameter, NULL, NULL);
    hThread[1] = ::CreateThread(NULL, NULL, ThreadProc2, lpParameter, NULL, NULL);
    hThread[2] = ::CreateThread(NULL, NULL, ThreadProc3, lpParameter, NULL, NULL);
    // 設置編輯框內容
    ::SetWindowText(::GetDlgItem(pDlg->m_hWnd, IDC_EDIT1), L"1000");
    // 將對象設置爲已通知狀態
    ::SetEvent(m_Event);
    // 使用WaitForMultipleObjects監聽全部線程,當線程所有結束後,調用CloseHandle關閉句柄.
    WaitForMultipleObjects(3, hThread, TRUE, -1);
    ::CloseHandle(hThread[0]);
    ::CloseHandle(hThread[1]);
    ::CloseHandle(hThread[2]);
    ::CloseHandle(m_Mutex);
    return 0;
}

// 線程回調函數1
DWORD WINAPI CMutexExDlg::ThreadProc1(LPVOID lpParameter)
{
    CMutexExDlg* pDlg = (CMutexExDlg*)lpParameter;
    while (true)
    {
        WaitForSingleObject(m_Event, -1);
        ::SetWindowText(::GetDlgItem(pDlg->m_hWnd, IDC_EDIT2), L"1000");
        Sleep(2000);
        // 將對象設置爲已通知狀態
        ::SetEvent(m_Event);
    }
    return 0;
}

// 線程回調函數2
DWORD WINAPI CMutexExDlg::ThreadProc2(LPVOID lpParameter)
{
    CMutexExDlg* pDlg = (CMutexExDlg*)lpParameter;
    while (true)
    {
        WaitForSingleObject(m_Event, -1);
        ::SetWindowText(::GetDlgItem(pDlg->m_hWnd, IDC_EDIT3), L"1000");
        Sleep(2000);
        // 將對象設置爲已通知狀態
        ::SetEvent(m_Event);
    }
    return 0;
}

// 線程回調函數3
DWORD WINAPI CMutexExDlg::ThreadProc3(LPVOID lpParameter)
{
    CMutexExDlg* pDlg = (CMutexExDlg*)lpParameter;
    while (true)
    {
        WaitForSingleObject(m_Event, -1);
        ::SetWindowText(::GetDlgItem(pDlg->m_hWnd, IDC_EDIT4), L"1000");
        Sleep(2000);
        // 將對象設置爲已通知狀態
        ::SetEvent(m_Event);
    }
    return 0;
}
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