ValueError: signal only works in main thread of the main interpreter

[joaander]

Description

ValueError: signal only works in main thread of the main interpreter when importing gsd in a non-main thread.

Script

import threading

def test():
    import gsd

thread = threading.Thread(target=test)
thread.start()
thread.join()

Input files

No response

Output

Exception in thread Thread-1 (test):
Traceback (most recent call last):
  File "/opt/homebrew/Cellar/python@3.11/3.11.3/Frameworks/Python.framework/Versions/3.11/lib/python3.11/threading.py", line 1038, in _bootstrap_inner
    self.run()
  File "/opt/homebrew/Cellar/python@3.11/3.11.3/Frameworks/Python.framework/Versions/3.11/lib/python3.11/threading.py", line 975, in run
    self._target(*self._args, **self._kwargs)
  File "/Users/joaander/test/test-gsd-thread.py", line 4, in test
    import gsd
  File "/Users/joaander/venv/lib/python3.11/site-packages/gsd/__init__.py", line 21, in <module>
    signal.signal(signal.SIGTERM, lambda n, f: sys.exit(1))
  File "/opt/homebrew/Cellar/python@3.11/3.11.3/Frameworks/Python.framework/Versions/3.11/lib/python3.11/signal.py", line 56, in signal
    handler = _signal.signal(_enum_to_int(signalnum), _enum_to_int(handler))
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
ValueError: signal only works in main thread of the main interpreter

Expected output

none

Platform

Linux, macOS

Installation method

PyPI package

GSD

3.0.0

Python version

3.11.3