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我正在从 POST 请求中调用py_trees.trees.BehaviourTree()的setup()方法（这会将我转移到非主线程），但出现以下错误：

ValueError: signal only works in main thread

如何在不传输主线程中的setup()方法的情况下处理这个问题？

此处提供了完整的跟踪：

    File "/usr/src/***/***/***/behavior_trees/tree.py", line 40, in test_tree
    behaviour_tree.setup(timeout=15.0)
    │              └ <function BehaviourTree.setup at 0x7f59a7feb3a0>
    └ <py_trees.trees.BehaviourTree object at 0x7f59a4068d60>

  File "/usr/local/lib/python3.8/site-packages/py_trees/trees.py", line 324, in setup
    setup(
    └ <function setup at 0x7f59a7fe3280>
  File "/usr/local/lib/python3.8/site-packages/py_trees/trees.py", line 109, in setup
    signal.signal(
    │      └ <function signal at 0x7f59b537e3a0>
    └ <module 'signal' from '/usr/local/lib/python3.8/signal.py'>
  File "/usr/local/lib/python3.8/signal.py", line 47, in signal
    handler = _signal.signal(_enum_to_int(signalnum), _enum_to_int(handler))
              │       │      │            │           │            └ functools.partial(<function setup.<locals>.signal_handler at 0x7f59a40d9ca0>, original_signal_handler=<Handlers.SIG_DFL: 0>)
              │       │      │            │           └ <function _enum_to_int at 0x7f59b537e310>
              │       │      │            └ <Signals.SIGUSR1: 10>
              │       │      └ <function _enum_to_int at 0x7f59b537e310>
              │       └ <built-in function signal>
              └ <module '_signal' (built-in)>

ValueError: signal only works in main thread
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