Mark the future as running or process any cancel notifications. Should only be used by Executor implementations and unit tests. If the future has been cancelled (cancel() was called and returned True) then any threads waiting on the future completing (though calls t
(self)
| 495 | |
| 496 | # The following methods should only be used by Executors and in tests. |
| 497 | def set_running_or_notify_cancel(self): |
| 498 | """Mark the future as running or process any cancel notifications. |
| 499 | |
| 500 | Should only be used by Executor implementations and unit tests. |
| 501 | |
| 502 | If the future has been cancelled (cancel() was called and returned |
| 503 | True) then any threads waiting on the future completing (though calls |
| 504 | to as_completed() or wait()) are notified and False is returned. |
| 505 | |
| 506 | If the future was not cancelled then it is put in the running state |
| 507 | (future calls to running() will return True) and True is returned. |
| 508 | |
| 509 | This method should be called by Executor implementations before |
| 510 | executing the work associated with this future. If this method returns |
| 511 | False then the work should not be executed. |
| 512 | |
| 513 | Returns: |
| 514 | False if the Future was cancelled, True otherwise. |
| 515 | |
| 516 | Raises: |
| 517 | RuntimeError: if this method was already called or if set_result() |
| 518 | or set_exception() was called. |
| 519 | """ |
| 520 | with self._condition: |
| 521 | if self._state == CANCELLED: |
| 522 | self._state = CANCELLED_AND_NOTIFIED |
| 523 | for waiter in self._waiters: |
| 524 | waiter.add_cancelled(self) |
| 525 | # self._condition.notify_all() is not necessary because |
| 526 | # self.cancel() triggers a notification. |
| 527 | return False |
| 528 | elif self._state == PENDING: |
| 529 | self._state = RUNNING |
| 530 | return True |
| 531 | else: |
| 532 | LOGGER.critical('Future %s in unexpected state: %s', |
| 533 | id(self), |
| 534 | self._state) |
| 535 | raise RuntimeError('Future in unexpected state') |
| 536 | |
| 537 | def set_result(self, result): |
| 538 | """Sets the return value of work associated with the future. |
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