C++线程同步之临界区

#include <iostream>
#include <windows.h>
using namespace std;

CRITICAL_SECTION cs;

// LockCount 它被初始化为数值 -1,此数值等于或大于 0 时，表示此临界区被占用;等待获得临界区的线程数：LockCount - (RecursionCount -1)        
// RecursionCount 此字段包含所有者线程已经获得该临界区的次数
// OwningThread 此字段包含当前占用此临界区的线程的线程标识符,此线程 ID 与GetCurrentThreadId 所返回的 ID 相同



DWORD WINAPI ThreadProc1(LPVOID lpParameter)
{
    for (int x = 0; x < 1000; x++)
    {
        EnterCriticalSection(&cs);
        Sleep(1000);
        printf("11111:%x %x %x
", cs.LockCount, cs.RecursionCount, cs.OwningThread);
        LeaveCriticalSection(&cs);
    }
    return 0;
}

DWORD WINAPI ThreadProc2(LPVOID lpParameter)
{
    for (int x = 0; x < 1000; x++)
    {
        EnterCriticalSection(&cs);
        Sleep(1000);
        printf("22222:%x %x %x
", cs.LockCount, cs.RecursionCount, cs.OwningThread);
        LeaveCriticalSection(&cs);
    }
    return 0;
}

DWORD WINAPI ThreadProc3(LPVOID lpParameter)
{
    for (int x = 0; x < 1000; x++)
    {
        EnterCriticalSection(&cs);
        Sleep(1000);
        printf("33333:%x %x %x
", cs.LockCount, cs.RecursionCount, cs.OwningThread);
        LeaveCriticalSection(&cs);
    }
    return 0;
}

DWORD WINAPI ThreadProc4(LPVOID lpParameter)
{
    for (int x = 0; x < 1000; x++)
    {
        EnterCriticalSection(&cs);
        Sleep(1000);
        printf("44444:%x %x %x
", cs.LockCount, cs.RecursionCount, cs.OwningThread);
        LeaveCriticalSection(&cs);
    }
    return 0;
}

int main()
{
    // 初始化临界区
    InitializeCriticalSection(&cs);
    // printf("%x %x %x", cs.LockCount, cs.RecursionCount, cs.OwningThread);
    // 创建一个新的线程
    HANDLE hTread1 = CreateThread(0, 0, ThreadProc1, 0, 0, 0);
    // 创建一个新的线程
    HANDLE hTread2 = CreateThread(0, 0, ThreadProc2, 0, 0, 0);
    // 创建一个新的线程
    HANDLE hTread3 = CreateThread(0, 0, ThreadProc3, 0, 0, 0);
    // 创建一个新的线程
    HANDLE hTread4 = CreateThread(0, 0, ThreadProc4, 0, 0, 0);
    // 如果不在其它的地方引用它就关闭句柄
    ::CloseHandle(hTread1);
    ::CloseHandle(hTread2);
    ::CloseHandle(hTread3);
    ::CloseHandle(hTread4);
    // 销毁临界区
    // DeleteCriticalSection(&cs);
    getchar();
    return 0;
}