多线程问题,求高手帮忙看看。

#include <iostream.h>
#include <windows.h>

DWORD WINAPI FunPro1(
  LPVOID lpParameter   // thread data
);

DWORD WINAPI FunPro2(
  LPVOID lpParameter   // thread data
);

int tickes = 100;

CRITICAL_SECTION g_cs;

void main()
{
    HANDLE hThread1 = CreateThread(NULL, 0, FunPro1, NULL, 0, NULL);
    HANDLE hThread2 = CreateThread(NULL, 0, FunPro2, NULL, 0, NULL);
    CloseHandle(hThread1);
    CloseHandle(hThread2);

    InitializeCriticalSection(&g_cs);

    Sleep(4000);
   
    DeleteCriticalSection(&g_cs);

}

DWORD WINAPI FunPro1(
  LPVOID lpParameter   // thread data
)
{
    while(TRUE)
    {
        EnterCriticalSection(&g_cs);
        if(tickes > 0)
        {
            Sleep(1);
            cout<<"Thread1 sell tickes..."<< tickes--<<endl;
        }
        else
        {
            break;
        }

        LeaveCriticalSection(&g_cs);
    }
    return 0;
}

DWORD WINAPI FunPro2(
  LPVOID lpParameter   // thread data
)
{
    while(TRUE)
    {        
        EnterCriticalSection(&g_cs);
        if(tickes > 0)
        {
            Sleep(1);
            cout<<"Thread2 sell tickes..."<< tickes--<<endl;
        }
        else
        {
            break;
        }
        LeaveCriticalSection(&g_cs);
    }
    return 0;
}


这个程序用多线程模拟售票系统,但是执行结果只看到一个线程运行,而且有时候会出现错误。代码哪里出了错误？？实在找不出什么原因。