_PyOS_SigintEvent() is needed for interruptible waiting on main thread

Bug report

Bug description:

Moved from https://github.com/python/cpython/pull/108605#issuecomment-2521215855

In https://github.com/python/cpython/pull/108605, _PyOS_SigintEvent was removed from the public headers.

TensorStore relies on that function here: https://github.com/google/tensorstore/blob/eda046b10158e7d82fdb0f23aeecdfdeb8ac5aa3/python/tensorstore/future.cc#L105 to enable synchronously blocking on the readiness of a custom Future type while allowing Ctrl+C to interrupt when running on the main thread.

The current workaround is to manually declare the function since the symbol is still available.

I'm not aware of a usable alternative. Since signal.set_wakeup_fd only allows a single fd to be set globally, it isn't usable from a library. The best alternative would probably be to poll by waking up every few hundred milliseconds.

CPython versions tested on:

3.13

Operating systems tested on:

No response

まず CPython PR #108605 と、TensorStore の python/tensorstore/future.cc の 105 行目にある _PyOS_SigintEvent の使用箇所を確認してください。public header の宣言を削除した場合に拡張ライブラリへどのような影響があるかを追跡し、利用可能なシグナルによるウェイクアップの代替手段を比較してください。完了の条件は、Ctrl+C の動作を維持したまま、ライブラリがメインスレッド上の同期的な待機を中断できる、サポートされた方法を提供することです。