| 433 | return self._selector.fileno() |
| 434 | |
| 435 | def select(self, timeout=None): |
| 436 | if timeout is None: |
| 437 | timeout = -1 |
| 438 | elif timeout <= 0: |
| 439 | timeout = 0 |
| 440 | else: |
| 441 | # epoll_wait() has a resolution of 1 millisecond, round away |
| 442 | # from zero to wait *at least* timeout seconds. |
| 443 | timeout = math.ceil(timeout * 1e3) * 1e-3 |
| 444 | |
| 445 | # epoll_wait() expects `maxevents` to be greater than zero; |
| 446 | # we want to make sure that `select()` can be called when no |
| 447 | # FD is registered. |
| 448 | max_ev = len(self._fd_to_key) or 1 |
| 449 | |
| 450 | ready = [] |
| 451 | try: |
| 452 | fd_event_list = self._selector.poll(timeout, max_ev) |
| 453 | except InterruptedError: |
| 454 | return ready |
| 455 | |
| 456 | fd_to_key = self._fd_to_key |
| 457 | for fd, event in fd_event_list: |
| 458 | key = fd_to_key.get(fd) |
| 459 | if key: |
| 460 | events = ((event & _NOT_EPOLLIN and EVENT_WRITE) |
| 461 | | (event & _NOT_EPOLLOUT and EVENT_READ)) |
| 462 | ready.append((key, events & key.events)) |
| 463 | return ready |
| 464 | |
| 465 | def close(self): |
| 466 | self._selector.close() |