多线程中的临界区

CRITICAL_SECTION   g_csSync = {};//临界区
INT   g_iData = 0;

DWORD  WINAPI  WriteThreadProc(LPVOID lpParameter)
{//写线程
while (1)
{
Sleep(30);
__try
{
EnterCriticalSection(&g_csSync);
g_iData++;
}
__finally
{
LeaveCriticalSection(&g_csSync);
}
}
return 0;
}

DWORD WINAPI  ReadThreadProc(LPVOID lpParameter)
{//读线程
while (true)
{
Sleep(30);
__try
{
EnterCriticalSection(&g_csSync);//进入临界区

char str[20] = {};
itoa(g_iData, str, 10);
TRACE(str);
}
__finally
{
LeaveCriticalSection(&g_csSync);//离开临界区
}
}
return 0;
}
void CtestThreadDlg::OnBnClickedButton16()
{
InitializeCriticalSectionAndSpinCount(&g_csSync, 0x4000);//初始化临界区

DWORD  ThreadID = 0;
HANDLE  hThread[2] = {};
hThread[0] = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)WriteThreadProc,
NULL, CREATE_SUSPENDED, &ThreadID);
hThread[1] = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)ReadThreadProc,
NULL, CREATE_SUSPENDED, &ThreadID);

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

WaitForMultipleObjects(2, hThread, TRUE, INFINITE);

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

DeleteCriticalSection(&g_csSync);//删除临界区
}