Fix issues with resuming async tasks awaiting a future by bjsowa · Pull Request #1469 · ros2/rclpy

bjsowa · 2025-06-07T01:15:19Z

Description

Is this user-facing behavior change?

~~The _pending() method in Future has been renamed to pending()~~
The user no longer has to do any workarounds with waking up the executor when a coroutine gets stuck awaiting a future that is already finished.

Did you use Generative AI?

Some of the comments and docstrings might be partially written by Github Copilot.

Additional Information

For #1467, I propagate a guard condition from a task to the awaited future and add this guard condition to the wait set in the executor. When a future is completed by an entity not controller by the executor (e.g. a separate thread), the guard condition is triggered and wakes up the executor so it can resume the task.

~~For #1405, I just had to make sure the task is not yielded from _wait_for_ready_callbacks when it is not ready to be resumed, hence the Task.ready() method.~~

EDIT: Check this comment

rclpy/rclpy/task.py

rclpy/rclpy/executors.py

Signed-off-by: Błażej Sowa <bsowa123@gmail.com>

Co-authored-by: Shane Loretz <shane.loretz@gmail.com> Signed-off-by: Błażej Sowa <bsowa123@gmail.com>

bjsowa · 2025-07-09T11:55:10Z

After looking at #971, I revised my solution to not modify the API of Task or Future.

Changes:

Added a call_soon method which schedules the task to be run in the next spin and wakes up the executor.
The tasks schedule themselves to be run in the next spin, using the new call_soon method, if they are ready to be resumed.
executor._tasks list now contains only tasks that are ready to run or resumed, not all tasks.

Improvements:

Fixes Calling future.set_result from another thread does not wake up the executor #1467, Using rclpy.spin_once and await in a coroutine causes busy waiting #1405 and now also async service server callback gets stuck on wait set #1462
Skips checking if tasks are ready to be resumed in each spin.

Regressions:

When a coroutine task awaits other task, when the other task finishes, the coroutine task needs 2 spins to be resumed as the first spin will only execute a callback which schedules the coroutine task to be run in next spin. This is reflected in the test_create_task_dependent_coroutines test.
There are 2 tests now that result in a Segmentation fault when run with the EventsExecutor. If this solution is accepted I might look into fixing it, any help would be appreciated.

bjsowa · 2025-07-15T11:25:21Z

@nadavelkabets Could you take a look?

nadavelkabets · 2025-07-15T22:38:49Z

@nadavelkabets Could you take a look?

I'll try to get to it this weekend

rclpy/rclpy/executors.py

rclpy/rclpy/task.py

skyegalaxy · 2025-12-03T18:59:56Z

https://github.com/Mergifyio backport kilted jazzy humble

mergify · 2025-12-03T19:00:10Z

backport kilted jazzy humble

✅ Backports have been created

Details

#1553 Fix issues with resuming async tasks awaiting a future (backport #1469) has been created for branch kilted
#1554 Fix issues with resuming async tasks awaiting a future (backport #1469) has been created for branch jazzy but encountered conflicts
#1555 Fix issues with resuming async tasks awaiting a future (backport #1469) has been created for branch humble but encountered conflicts

Signed-off-by: Błażej Sowa <bsowa123@gmail.com> Signed-off-by: Nadav Elkabets <elnadav12@gmail.com> Co-authored-by: Nadav Elkabets <32939935+nadavelkabets@users.noreply.github.com> (cherry picked from commit 9695271) # Conflicts: # rclpy/rclpy/executors.py # rclpy/rclpy/task.py # rclpy/test/test_executor.py # rclpy/test/test_task.py

Signed-off-by: Błażej Sowa <bsowa123@gmail.com> Signed-off-by: Nadav Elkabets <elnadav12@gmail.com> Co-authored-by: Nadav Elkabets <32939935+nadavelkabets@users.noreply.github.com> (cherry picked from commit 9695271)

Signed-off-by: Błażej Sowa <bsowa123@gmail.com> Signed-off-by: Nadav Elkabets <elnadav12@gmail.com> Co-authored-by: Nadav Elkabets <32939935+nadavelkabets@users.noreply.github.com> (cherry picked from commit 9695271) # Conflicts: # rclpy/rclpy/executors.py # rclpy/rclpy/task.py # rclpy/src/rclpy/events_executor/events_executor.cpp # rclpy/src/rclpy/events_executor/events_executor.hpp # rclpy/test/test_executor.py # rclpy/test/test_task.py

(cherry picked from commit 9695271) Signed-off-by: Błażej Sowa <bsowa123@gmail.com> Signed-off-by: Nadav Elkabets <elnadav12@gmail.com> Co-authored-by: Błażej Sowa <bsowa123@gmail.com> Co-authored-by: Nadav Elkabets <32939935+nadavelkabets@users.noreply.github.com>

…#1469) Signed-off-by: Błażej Sowa <bsowa123@gmail.com> Signed-off-by: Nadav Elkabets <elnadav12@gmail.com> Co-authored-by: Nadav Elkabets <32939935+nadavelkabets@users.noreply.github.com>

Signed-off-by: Błażej Sowa <bsowa123@gmail.com> Signed-off-by: Nadav Elkabets <elnadav12@gmail.com> Co-authored-by: Nadav Elkabets <32939935+nadavelkabets@users.noreply.github.com> Signed-off-by: Michael Carlstrom <rmc@carlstrom.com>

…#1469) Signed-off-by: Błażej Sowa <bsowa123@gmail.com>

… (#1560) Signed-off-by: Błażej Sowa <bsowa123@gmail.com> Signed-off-by: Nadav Elkabets <elnadav12@gmail.com> Co-authored-by: Nadav Elkabets <32939935+nadavelkabets@users.noreply.github.com> Co-authored-by: Florian Vahl <git@flova.de>

…#1469) Signed-off-by: Błażej Sowa <bsowa123@gmail.com>

) * Fix warnings from gcc. (#1501) Signed-off-by: Michael Carlstrom <rmc@carlstrom.com> * Update type_support to use new abcs Signed-off-by: Michael Carlstrom <rmc@carlstrom.com> * Cleanup old test cases to use new automatic inference Signed-off-by: Michael Carlstrom <rmc@carlstrom.com> * Add content-filtered-topic interfaces (#1506) Signed-off-by: Barry Xu <Barry.Xu@sony.com> Signed-off-by: Michael Carlstrom <rmc@carlstrom.com> * Added lock to protect futures for multithreaded executor (#1477) Signed-off-by: brennanmk <brennanmk2200@gmail.com> Signed-off-by: Michael Carlstrom <rmc@carlstrom.com> * EventsExecutor: Handle async callbacks for services and subscriptions (#1478) Closes #1473 Signed-off-by: Brad Martin <bmartin@fatlxception.org> Co-authored-by: Brad Martin <bmartin@fatlxception.org> Co-authored-by: Alejandro Hernandez Cordero <ahcorde@gmail.com> Signed-off-by: Michael Carlstrom <rmc@carlstrom.com> * add spinning state for the Executor classes. (#1510) Signed-off-by: Tomoya.Fujita <tomoya.fujita825@gmail.com> Signed-off-by: Michael Carlstrom <rmc@carlstrom.com> * Fixes Action.*_async futures never complete (#1308) Per rclpy:1123 If two seperate client server actions are running in seperate executors the future given to the ActionClient will never complete due to a race condition This fixes the calls to rcl handles potentially leading to deadlock scenarios by adding locks to there references Co-authored-by: Aditya Agarwal <aditya.kgp25@gmail.com> Co-authored-by: Jonathan Blixt <jmblixt3@gmail.com> Signed-off-by: Jonathan Blixt <jmblixt3@gmail.com> Co-authored-by: Alejandro Hernandez Cordero <ahcorde@gmail.com> Signed-off-by: Michael Carlstrom <rmc@carlstrom.com> * remove unused 'param_type' (#1524) 'param_type' is set but never used Signed-off-by: Christian Rauch <Christian.Rauch@unileoben.ac.at> Signed-off-by: Michael Carlstrom <rmc@carlstrom.com> * Changelog Signed-off-by: Alejandro Hernandez Cordero <ahcorde@gmail.com> Signed-off-by: Michael Carlstrom <rmc@carlstrom.com> * 10.0.1 Signed-off-by: Michael Carlstrom <rmc@carlstrom.com> * Remove duplicate future handling from send_goal_async (#1532) A recent change intended to move this logic into a lock context, but actually ended up duplicating it instead. This fixes that by removing the duplicated logic outside of the lock. It also preserves the explicit typing annotation on the future. Signed-off-by: Nathan Wiebe Neufeldt <wn.nathan@gmail.com> Signed-off-by: Michael Carlstrom <rmc@carlstrom.com> * fix(test_events_executor): destroy all nodes before shutdown (#1538) Signed-off-by: yuanyuyuan <az6980522@gmail.com> Signed-off-by: Michael Carlstrom <rmc@carlstrom.com> * add BaseImpl Signed-off-by: Michael Carlstrom <rmc@carlstrom.com> * Add ImplT Support Signed-off-by: Michael Carlstrom <rmc@carlstrom.com> * fix changelong Signed-off-by: Michael Carlstrom <rmc@carlstrom.com> * Remove accidental tuple (#1542) Signed-off-by: Michael Carlstrom <rmc@carlstrom.com> * Allow action servers without execute callback (#1219) Signed-off-by: Tim Clephas <tim.clephas@nobleo.nl> * add : get clients, servers info (#1307) Signed-off-by: Minju, Lee <dlalswn531@naver.com> Signed-off-by: Michael Carlstrom <rmc@carlstrom.com> * 10.0.2 Signed-off-by: Michael Carlstrom <rmc@carlstrom.com> * update tests Signed-off-by: Michael Carlstrom <rmc@carlstrom.com> * ParameterEventHandler support ContentFiltering (#1531) * ParameterEventHandler support ContentFiltering Signed-off-by: Barry Xu <barry.xu@sony.com> * Address review comments Signed-off-by: Barry Xu <barry.xu@sony.com> --------- Signed-off-by: Barry Xu <barry.xu@sony.com> Signed-off-by: Michael Carlstrom <rmc@carlstrom.com> * Fix issues with resuming async tasks awaiting a future (#1469) Signed-off-by: Błażej Sowa <bsowa123@gmail.com> Signed-off-by: Nadav Elkabets <elnadav12@gmail.com> Co-authored-by: Nadav Elkabets <32939935+nadavelkabets@users.noreply.github.com> Signed-off-by: Michael Carlstrom <rmc@carlstrom.com> * 10.0.3 Signed-off-by: Michael Carroll <mjcarroll@intrinsic.ai> Signed-off-by: Michael Carlstrom <rmc@carlstrom.com> * Increase clock accuracy (#1564) Signed-off-by: Florian Vahl <git@flova.de> Signed-off-by: Michael Carlstrom <rmc@carlstrom.com> * Use unconditional wait when possible. (#1563) Previously the max() value of the steady time was used as the default deadline. In some environments this results in overflows in the underlying pthread_cond_timedwait call, which waits for the conditional variable in the events queue implementation. Consequently, this lead to freezes in the executor. Reducing the deadline significantly helped, but using `cv.wait` instead of `cv_.wait_until` seems to be the cleaner solution. Signed-off-by: Florian Vahl <florian.vahl@dlr.de> Signed-off-by: Michael Carlstrom <rmc@carlstrom.com> * Remove default from switch with enum, so that compiler warns. (#1566) Signed-off-by: Tomoya Fujita <Tomoya.Fujita@sony.com> Signed-off-by: Michael Carlstrom <rmc@carlstrom.com> * Fix parameter parsing for unspecified target nodes (#1552) Signed-off-by: Barry Xu <barry.xu@sony.com> Signed-off-by: Michael Carlstrom <rmc@carlstrom.com> * Improve the compatibility of processing YAML parameter files (#1548) Signed-off-by: Barry Xu <barry.xu@sony.com> Signed-off-by: Michael Carlstrom <rmc@carlstrom.com> * Improve wildcard parsing and optimize the logic for parsing YAML para… (#1571) Signed-off-by: Barry Xu <barry.xu@sony.com> Signed-off-by: Michael Carlstrom <rmc@carlstrom.com> * Expose action graph functions as Node class methods. (#1574) * Expose action graph functions as Node class methods. Signed-off-by: Tomoya Fujita <Tomoya.Fujita@sony.com> * address review comments to keep the warning consistent. Signed-off-by: Tomoya.Fujita <Tomoya.Fujita@sony.com> --------- Signed-off-by: Tomoya Fujita <Tomoya.Fujita@sony.com> Signed-off-by: Tomoya.Fujita <Tomoya.Fujita@sony.com> * Fix performance bug in MultiThreadedExecutor (hopefully) (#1547) Signed-off-by: Michael Tandy <git@mjt.me.uk> Signed-off-by: Michael Carlstrom <rmc@carlstrom.com> * Changelog Signed-off-by: Alejandro Hernandez Cordero <ahcorde@gmail.com> Signed-off-by: Michael Carlstrom <rmc@carlstrom.com> * 10.0.4 Signed-off-by: Michael Carlstrom <rmc@carlstrom.com> * use Msg over BaseMessage Signed-off-by: Michael Carlstrom <rmc@carlstrom.com> * Use Srv over BaseService Signed-off-by: Michael Carlstrom <rmc@carlstrom.com> * Use Action over BaseAction Signed-off-by: Michael Carlstrom <rmc@carlstrom.com> * lint Signed-off-by: Michael Carlstrom <rmc@carlstrom.com> * Update rclpy/rclpy/type_support.py Co-authored-by: Christophe Bedard <bedard.christophe@gmail.com> Signed-off-by: Michael Carlstrom <rmc@carlstrom.com> --------- Signed-off-by: Michael Carlstrom <rmc@carlstrom.com> Signed-off-by: Barry Xu <Barry.Xu@sony.com> Signed-off-by: brennanmk <brennanmk2200@gmail.com> Signed-off-by: Brad Martin <bmartin@fatlxception.org> Signed-off-by: Tomoya.Fujita <tomoya.fujita825@gmail.com> Signed-off-by: Christian Rauch <Christian.Rauch@unileoben.ac.at> Signed-off-by: Alejandro Hernandez Cordero <ahcorde@gmail.com> Signed-off-by: Nathan Wiebe Neufeldt <wn.nathan@gmail.com> Signed-off-by: yuanyuyuan <az6980522@gmail.com> Signed-off-by: Tim Clephas <tim.clephas@nobleo.nl> Signed-off-by: Minju, Lee <dlalswn531@naver.com> Signed-off-by: Barry Xu <barry.xu@sony.com> Signed-off-by: Błażej Sowa <bsowa123@gmail.com> Signed-off-by: Nadav Elkabets <elnadav12@gmail.com> Signed-off-by: Michael Carroll <mjcarroll@intrinsic.ai> Signed-off-by: Florian Vahl <git@flova.de> Signed-off-by: Florian Vahl <florian.vahl@dlr.de> Signed-off-by: Tomoya Fujita <Tomoya.Fujita@sony.com> Signed-off-by: Tomoya.Fujita <Tomoya.Fujita@sony.com> Signed-off-by: Michael Tandy <git@mjt.me.uk> Co-authored-by: Chris Lalancette <clalancette@gmail.com> Co-authored-by: Barry Xu <barry.xu@sony.com> Co-authored-by: Brennan Miller-Klugman <55165406+brennanmk@users.noreply.github.com> Co-authored-by: Brad Martin <52003535+bmartin427@users.noreply.github.com> Co-authored-by: Brad Martin <bmartin@fatlxception.org> Co-authored-by: Alejandro Hernandez Cordero <ahcorde@gmail.com> Co-authored-by: Tomoya Fujita <Tomoya.Fujita@sony.com> Co-authored-by: Jonathan <jmblixt3@gmail.com> Co-authored-by: Christian Rauch <Christian.Rauch@unileoben.ac.at> Co-authored-by: Nathan Wiebe Neufeldt <wn.nathan@gmail.com> Co-authored-by: Yuyuan Yuan <az6980522@gmail.com> Co-authored-by: Tim Clephas <tim.clephas@nobleo.nl> Co-authored-by: Minju, Lee <70446214+leeminju531@users.noreply.github.com> Co-authored-by: Błażej Sowa <bsowa123@gmail.com> Co-authored-by: Nadav Elkabets <32939935+nadavelkabets@users.noreply.github.com> Co-authored-by: Michael Carroll <mjcarroll@intrinsic.ai> Co-authored-by: Florian Vahl <git@flova.de> Co-authored-by: Michael Tandy <git@mjt.me.uk> Co-authored-by: Christophe Bedard <bedard.christophe@gmail.com>

… (#1582) * Fix issues with resuming async tasks awaiting a future (backport #1469) Signed-off-by: Błażej Sowa <bsowa123@gmail.com> * Drop the usage of dataclasses for Python 3.6 compatibility Signed-off-by: Błażej Sowa <bsowa123@gmail.com> * Use single instead of double quotes Signed-off-by: Błażej Sowa <bsowa123@gmail.com> --------- Signed-off-by: Błażej Sowa <bsowa123@gmail.com>

bjsowa force-pushed the fix/async-task-resume branch from 47a7eac to eeea7b0 Compare June 7, 2025 01:17

bjsowa changed the title ~~Fix/async task resume~~ Fix issues with resuming async tasks awaiting a future Jun 7, 2025

bjsowa force-pushed the fix/async-task-resume branch from eeea7b0 to cb2e8bb Compare June 7, 2025 13:34

bjsowa mentioned this pull request Jun 7, 2025

fix: Reduce idle CPU consumption of websocket server RobotWebTools/rosbridge_suite#1040

Merged

sloretz mentioned this pull request Jun 12, 2025

Calling future.set_result from another thread does not wake up the executor #1467

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sloretz self-requested a review June 12, 2025 17:30

nadavelkabets reviewed Jun 24, 2025

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bjsowa added 4 commits July 9, 2025 13:10

Make pending() a public method of Future

78c50be

Signed-off-by: Błażej Sowa <bsowa123@gmail.com>

Use yielded future to determine whether task is ready to be resumed

428e4e7

Signed-off-by: Błażej Sowa <bsowa123@gmail.com>

Use guard condition to wake up the executor when the task becomes ready

defad88

Signed-off-by: Błażej Sowa <bsowa123@gmail.com>

Add a test for resuming coroutine

19e9c0a

Signed-off-by: Błażej Sowa <bsowa123@gmail.com>

bjsowa force-pushed the fix/async-task-resume branch from e5486c8 to c417824 Compare July 9, 2025 11:11

bjsowa added 7 commits July 9, 2025 13:13

Add call_soon method to the executor

534acce

Signed-off-by: Błażej Sowa <bsowa123@gmail.com>

Revert changes to executors.py and task.py

23e334f

Signed-off-by: Błażej Sowa <bsowa123@gmail.com>

Make the tasks schedule itself to the executor when they can be resumed

6695847

Signed-off-by: Błażej Sowa <bsowa123@gmail.com>

Fix flake8 error

c6f729c

Signed-off-by: Błażej Sowa <bsowa123@gmail.com>

Fix dependent coroutine test

2a35478

Signed-off-by: Błażej Sowa <bsowa123@gmail.com>

Disable EventsExecutor tests that result in Segmentation fault

e39d310

Signed-off-by: Błażej Sowa <bsowa123@gmail.com>

Don't schedule tasks when yielding handlers

458a73c

Signed-off-by: Błażej Sowa <bsowa123@gmail.com>

bjsowa force-pushed the fix/async-task-resume branch from c417824 to 458a73c Compare July 9, 2025 11:13

Don't remove tasks not managed by this executor

bde1872

Co-authored-by: Shane Loretz <shane.loretz@gmail.com> Signed-off-by: Błażej Sowa <bsowa123@gmail.com>

bjsowa requested a review from nadavelkabets July 9, 2025 11:56

nadavelkabets reviewed Jul 19, 2025

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This was referenced Dec 3, 2025

Fix issues with resuming async tasks awaiting a future (backport #1469) #1553

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Fix issues with resuming async tasks awaiting a future (backport #1469) #1554

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mergify bot mentioned this pull request Dec 3, 2025

Fix issues with resuming async tasks awaiting a future (backport #1469) #1555

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bjsowa mentioned this pull request Dec 8, 2025

Fix issues with resuming async tasks awaiting a future (backport #1469) #1560

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claraberendsen mentioned this pull request Dec 9, 2025

👩‍🌾 Regression on TestExecutor.test_create_task_coroutine_wake_from_another_thread #1562

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Flova mentioned this pull request Dec 12, 2025

Fix windows regression: Increase clock accuracy #1564

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mjcarroll mentioned this pull request Dec 12, 2025

Fix performance bug in MultiThreadedExecutor (hopefully) #1547

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fujitatomoya mentioned this pull request Dec 17, 2025

Fix overflow caused by default spin timeout #1563

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bjsowa added a commit to bjsowa/rclpy that referenced this pull request Jan 12, 2026

Fix issues with resuming async tasks awaiting a future (backport ros2…

0c1dc47

…#1469) Signed-off-by: Błażej Sowa <bsowa123@gmail.com>

bjsowa added a commit to bjsowa/rclpy that referenced this pull request Jan 19, 2026

Fix issues with resuming async tasks awaiting a future (backport ros2…

15c73ca

…#1469) Signed-off-by: Błażej Sowa <bsowa123@gmail.com>

bjsowa mentioned this pull request Jan 19, 2026

Fix issues with resuming async tasks awaiting a future (backport #1469) #1582

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bananajr mentioned this pull request Jan 29, 2026

Exception when awaiting call_async() #1588

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haudren-woven mentioned this pull request Feb 4, 2026

Action Server - MultiThreadedExecutor #1598

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fujitatomoya mentioned this pull request Feb 4, 2026

Prevents the Future result from being set twice. #1599

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Prevents the Future result from being set twice. (backport #1599) #1603

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Prevents the Future result from being set twice. (backport #1599) #1604

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Prevents the Future result from being set twice. (backport #1599) #1605

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bjsowa mentioned this pull request Feb 11, 2026

fix: Failing service and subscription tests RobotWebTools/rosbridge_suite#1147

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Fix issues with resuming async tasks awaiting a future#1469

Fix issues with resuming async tasks awaiting a future#1469
ahcorde merged 41 commits intoros2:rollingfrom
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