static CRITICAL_SECTION critical_section;
#define NMEM_ENTER EnterCriticalSection(&critical_section)
#define NMEM_LEAVE LeaveCriticalSection(&critical_section)
static CRITICAL_SECTION critical_section;
#define NMEM_ENTER EnterCriticalSection(&critical_section)
#define NMEM_LEAVE LeaveCriticalSection(&critical_section)