windows系统调用 临界区机制

#include "iostream"
#include "windows.h"
#include "cstring"
using namespace std;


static int g_nIndex=0;
const int MAX_TIMES=10;
static DWORD g_dwTimes;
CRITICAL_SECTION g_CriticalSection;

DWORD WINAPI IncProc(LPVOID lpParam){
    BOOL fDone=FALSE;
    while(!fDone){
        EnterCriticalSection(&g_CriticalSection);
        if(g_nIndex>=MAX_TIMES){
            fDone=TRUE;

        }
        else{
            g_dwTimes++;
            printf("The Inc count's value is%d.
",g_dwTimes);
            g_nIndex++;
            Sleep(10);
        }
        LeaveCriticalSection(&g_CriticalSection);
    }

    return(0);
}

DWORD WINAPI DecProc(LPVOID lpParam){
    BOOL fDone=FALSE;
    while(!fDone){
        EnterCriticalSection(&g_CriticalSection);
        if(g_nIndex>=MAX_TIMES){
            fDone=TRUE;
        }
        else{
        g_dwTimes--;
        printf("The Dec count's value id %d.
",g_dwTimes);
        g_nIndex++;
        Sleep(10);
        }
        LeaveCriticalSection(&g_CriticalSection);
    }

    return(0);
}

void main(){
    HANDLE hThread[2];

    InitializeCriticalSection(&g_CriticalSection);

    hThread[0]=CreateThread(
        NULL,
        0,
        IncProc,
        reinterpret_cast<LPVOID>(2),
        0,
        NULL
        );
    printf("Thread0 is Created!
");

    hThread[1]=CreateThread(
        NULL,
        0,
        DecProc,
        reinterpret_cast<LPVOID>(2),
        0,
        NULL
        );
    printf("Thread1 is Created!
");

    printf("Both Threads are ready into critical section!
");

    WaitForMultipleObjects(2,hThread,TRUE,INFINITE);

    CloseHandle(hThread[1]);
    CloseHandle(hThread[0]);

    DeleteCriticalSection(&g_CriticalSection);

    getchar();
}