Keep Track of Where Each Python Thread Was Started

Feature or enhancement

Proposal:

Debugging threads can be tricky. One thing that could sometimes help would be knowing where Thread.start() was called. We could achieve this by capturing the traceback of the call and attaching it to the thread. We probably wouldn't want to keep the actual traceback, due to how that would leak all the frames, etc. Instead, we'd probably want to use traceback.TracebackSummary or perhaps even something more lightweight. (FYI, there are other places where such a lightweight traceback snapshot would be useful.)

FWIW, the same sort of tracking might be helpful for coroutines (asyncio), though this is partly addressed by https://github.com/python/cpython/pull/124640.

Has this already been discussed elsewhere?

No response given

Links to previous discussion of this feature:

No response

まず Thread.start() のエントリポイントと traceback.TracebackSummary を読んで、提案されているキャプチャと保存の境界を理解します。threading のメンテナーと設計を定義し、その後、スレッドがどこで開始されたかを記録しつつ、存続中の traceback フレームを保持しないことを示すテストカバレッジを追加します。