Bugfix: executor doesn't propagate exception from task that awaited a future (backport #1643)#1651
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Bugfix: executor doesn't propagate exception from task that awaited a future (backport #1643)#1651mergify[bot] wants to merge 1 commit into
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… future (#1643) * Schedule the original task when task awaits a future Signed-off-by: Nadav Elkabets <elnadav12@gmail.com> * Add MultiThreadedExecutor to test Signed-off-by: Nadav Elkabets <elnadav12@gmail.com> * Add tests for awaiting a done future and task cancellation during await Signed-off-by: Nadav Elkabets <elnadav12@gmail.com> * Removed unused variable Signed-off-by: Nadav Elkabets <elnadav12@gmail.com> --------- Signed-off-by: Nadav Elkabets <elnadav12@gmail.com> (cherry picked from commit aac0ebb)
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ahcorde
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Jun 22, 2026
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Pulls: #1651
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Fixes #1642
Changes
A task now registers itself on the awaited future via new
Future._add_waiting_task.The executor then dispatches the same
Taskobject and sees its exception throughhandler.exception()as intended.Future._callbacksnow holdsUnion[Callable, Task]_schedule_or_invoke_done_callbackshandlesTaskentries throughexecutor._call_task_in_next_spin._wait_for_ready_callbacksskips tasks that were cancelled or completed between being queued and being popped.warnings.warnfires if a waitingTaskis dropped because the executor weakref could not be resolved.This is an automatic backport of pull request Bugfix: executor doesn't propagate exception from task that awaited a future #1643 done by Mergify.