使用临界区 CRITICAL_SECTION 实现互斥

下面是使用 CRITICAL_SECTION 实现互斥的例子：

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

//#define USE_CRITICAL_SECTION

CRITICAL_SECTION g_cs;

DWORD WINAPI thread(PVOID pBuf)
{
#ifdef USE_CRITICAL_SECTION
    EnterCriticalSection(&g_cs);
#endif
    LARGE_INTEGER li;
    QueryPerformanceCounter(&li);
    srand(li.QuadPart);
    int time = rand() % 1000;
    cout<<"Sleep time: "<<time<<" ms"<<endl;
    Sleep(time);
    cout<<"This is "<<(char*)pBuf<<endl;
#ifdef USE_CRITICAL_SECTION
    LeaveCriticalSection(&g_cs);
#endif
    return 0;
}

void main()
{
#ifdef USE_CRITICAL_SECTION
    InitializeCriticalSection(&g_cs);
#endif
    CreateThread(0, 0, &thread, "thread 1", 0, 0);
    CreateThread(0, 0, &thread, "thread 2", 0, 0);
    Sleep(2100);
}

除了使用临界区（CRITICAL_SECTION）外，还有其它方法，如互斥（mutex）、事件（event）等等。