coro::task_container gc fix not completing coroutines #288
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jbaldwin
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We can safely ignore the false positive on codacy, the variable very much is used. |
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The coro::task_container::gc_internal function was deleting coroutines when marked as .done(), however there is some mechanism that rarely would cause the user_task coroutine to not actually execute. I'm still not sure exactly why this is the case but: 1) Simply disabling gc_internal() would stop the problem 2) Running gc_internal() and moving the coro::task to a 'dead' list still caused the issue. With these in mind I spent time re-reading the specification on the final_suspend and determined that coro::task_container should be a thing atomic counter to track the submitted coroutines and have them self delete. The self deletion is now done via a coro::detail::task_self_destroying coroutine type that takes advantage of the promise's final_suspend() not suspending. The spec states that if this doesn't suspend then the coroutine will call destroy() on itself. Closes #287
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breakds
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I renamed |
breakds
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Jan 29, 2025
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The coro::task_container::gc_internal function was deleting coroutines when marked as .done(), however there is some mechanism that rarely would cause the user_task coroutine to not actually execute. I'm still not sure exactly why this is the case but:
still caused the issue.
With these in mind I spent time re-reading the specification on the final_suspend and determined that coro::task_container should be a thing atomic counter to track the submitted coroutines and have them self delete. The self deletion is now done via a
coro::detail::task_self_destroying coroutine type that takes advantage of the promise's final_suspend() not suspending. The spec states that if this doesn't suspend then the coroutine will call destroy() on itself.
Closes #287