#include <iostream>
 #include <Windows.h>
using namespace std;
volatile LONG lfsSpinLock = 0;
int num = 0;
// lfsSpinLock is a 'long' and when it is '1' it is locked, and '0' is unlocked
#define ENTER_LFS_LOCK_ while( InterlockedExchange( &lfsSpinLock, 1 ) == 1 ){ Sleep( 10 ); }
#define EXIT_LFS_LOCK_ InterlockedExchange( &lfsSpinLock, 0 );
void Func1()
   {
//Wait to access the resource. 等待資源
ENTER_LFS_LOCK_;
for (int i = 0;i < 20; i++)
  {
num++;
cout<<num<<endl;
 }
EXIT_LFS_LOCK_;
 }
int _tmain(int argc, _TCHAR* argv[])
{
HANDLE hThrd[4];
DWORD dwThrdID[4];
hThrd[0] = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)Func1, NULL, 0, &dwThrdID[0]);
hThrd[1] = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)Func1, NULL, 0, &dwThrdID[1]);
hThrd[2] = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)Func1, NULL, 0, &dwThrdID[2]);
hThrd[3] = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)Func1, NULL, 0, &dwThrdID[3]);
WaitForMultipleObjects(4, hThrd, TRUE, INFINITE);
for (int i=0;i<4;i++)
{
CloseHandle(hThrd[i]);
}
system("pause");
return 0;
}
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