Open
Conversation
To avoid lost wakeups, use an internal mutex to protect modification of the awaiter list. Now, while we are notifying, if another notification task arrives it must wait for our modification of the awaiter list to complete. Hence waiters that were not ready and are pushed back on the list have a chance to be woken up by the next notification. - Closes #398
jbaldwin
commented
Nov 26, 2025
include/coro/condition_variable.hpp
Outdated
| waiter = waiter->m_next; | ||
| } | ||
|
|
||
| coro::task_group group{executor, std::move(notify_tasks)}; |
Owner
Author
There was a problem hiding this comment.
I think this could possibly also just be a when_all(notify_tasks) but we'd need to refactor how make_notify_all_executor_individual_task() work internally to possibly take an executor and if it receives one to schedule itself.. which honestly is probably more efficient since it won't introduce the task_self_deleting as an intermediate, just a schedule co_await.
Owner
Author
There was a problem hiding this comment.
updated with another patchset to show when_all usage, I think they are roughly equivalent, but when_all seems a little more appropriate since we actually do know the lifetime of the tasks, and task_group should be use for more dynamic lifetimes
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
2 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
No description provided.