fubar.c

volatile int uv_initialized = 0;
volatile HANDLE uv_init_event = NULL;


void uv_init() {
  HANDLE event, event2;
  DWORD result;

  if (!uv_initialized) {
    event = CreateEvent(NULL, 1, 0, NULL);
    assert(event != NULL);
    
    event2 = InterlockedCompareExchangePointer(&uv_init_event, event, NULL);
    
    if (event2 == NULL) {
      uv__init();
      
      uv_initialized = 1;
      result = SetEvent(event);
      assert(result);
    } else {
      CloseHandle(event);
      result = WaitForSingleObject(event2, INFINITE)
      assert(result == WAIT_OBJECT_0);
    }
  }
}