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[App] Fixing Sigterm Handler causing thread lock which caused KeyboardInterrupt to hang #15881

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merged 2 commits into from Dec 1, 2022
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[App] Fixing Sigterm Handler causing thread lock which caused KeyboardInterrupt to hang #15881

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df9c618
terminating only once
Dec 1, 2022
b44c026
changelog
Dec 1, 2022
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2 changes: 2 additions & 0 deletions src/lightning_app/CHANGELOG.md
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Expand Up @@ -42,6 +42,8 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).

- Fixed the `enable_spawn` method of the `WorkRunExecutor` ([#15812](https://github.com/Lightning-AI/lightning/pull/15812)

- Fixed Sigterm Handler causing thread lock which caused KeyboardInterrupt to hang ([#15881](https://github.com/Lightning-AI/lightning/pull/15881))


## [1.8.3] - 2022-11-22

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5 changes: 4 additions & 1 deletion src/lightning_app/runners/multiprocess.py
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Expand Up @@ -27,6 +27,7 @@ class MultiProcessRuntime(Runtime):
"""

backend: Union[str, Backend] = "multiprocessing"
_has_triggered_termination: bool = False

def dispatch(self, *args: Any, on_before_run: Optional[Callable] = None, **kwargs: Any):
"""Method to dispatch and run the LightningApp."""
Expand Down Expand Up @@ -111,9 +112,11 @@ def dispatch(self, *args: Any, on_before_run: Optional[Callable] = None, **kwarg
self.app._run()
except KeyboardInterrupt:
self.terminate()
self._has_triggered_termination = True
raise
finally:
self.terminate()
if not self._has_triggered_termination:
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self.terminate()

def terminate(self):
if APP_SERVER_IN_CLOUD:
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