python-trio / python-trio/trio
Main thread recognition broken when embedding
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- Python
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Description
Trying to use Trio in a Python installation that already has installed a C level SIGINT handler fails.
File "/usr/lib/python3/dist-packages/trio/_util.py", line 79, in is_main_thread
signal.signal(signal.SIGINT, signal.getsignal(signal.SIGINT))
File "/usr/lib/python3.11/signal.py", line 56, in signal
handler = _signal.signal(_enum_to_int(signalnum), _enum_to_int(handler))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: signal handler must be signal.SIG_IGN, signal.SIG_DFL, or a callable object
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start in trio/_util.py at is_main_thread, using the traceback as the entry point. Reproduce the failure with an installed C-level SIGINT handler and inspect the existing signal-based recognition logic. Done means embedded use no longer raises the reported TypeError in this situation.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- python
- Domain
- backend
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 38/100