95 lines
3.1 KiB
Python
95 lines
3.1 KiB
Python
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# -*- coding: utf-8 -*-
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import multiprocessing
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import threading
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from pybind11_tests import gil_scoped as m
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def _run_in_process(target, *args, **kwargs):
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"""Runs target in process and returns its exitcode after 10s (None if still alive)."""
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process = multiprocessing.Process(target=target, args=args, kwargs=kwargs)
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process.daemon = True
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try:
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process.start()
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# Do not need to wait much, 10s should be more than enough.
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process.join(timeout=10)
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return process.exitcode
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finally:
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if process.is_alive():
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process.terminate()
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def _python_to_cpp_to_python():
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"""Calls different C++ functions that come back to Python."""
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class ExtendedVirtClass(m.VirtClass):
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def virtual_func(self):
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pass
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def pure_virtual_func(self):
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pass
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extended = ExtendedVirtClass()
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m.test_callback_py_obj(lambda: None)
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m.test_callback_std_func(lambda: None)
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m.test_callback_virtual_func(extended)
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m.test_callback_pure_virtual_func(extended)
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def _python_to_cpp_to_python_from_threads(num_threads, parallel=False):
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"""Calls different C++ functions that come back to Python, from Python threads."""
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threads = []
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for _ in range(num_threads):
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thread = threading.Thread(target=_python_to_cpp_to_python)
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thread.daemon = True
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thread.start()
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if parallel:
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threads.append(thread)
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else:
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thread.join()
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for thread in threads:
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thread.join()
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# TODO: FIXME, sometimes returns -11 (segfault) instead of 0 on macOS Python 3.9
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def test_python_to_cpp_to_python_from_thread():
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"""Makes sure there is no GIL deadlock when running in a thread.
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It runs in a separate process to be able to stop and assert if it deadlocks.
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"""
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assert _run_in_process(_python_to_cpp_to_python_from_threads, 1) == 0
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# TODO: FIXME on macOS Python 3.9
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def test_python_to_cpp_to_python_from_thread_multiple_parallel():
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"""Makes sure there is no GIL deadlock when running in a thread multiple times in parallel.
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It runs in a separate process to be able to stop and assert if it deadlocks.
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"""
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assert _run_in_process(_python_to_cpp_to_python_from_threads, 8, parallel=True) == 0
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# TODO: FIXME on macOS Python 3.9
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def test_python_to_cpp_to_python_from_thread_multiple_sequential():
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"""Makes sure there is no GIL deadlock when running in a thread multiple times sequentially.
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It runs in a separate process to be able to stop and assert if it deadlocks.
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"""
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assert (
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_run_in_process(_python_to_cpp_to_python_from_threads, 8, parallel=False) == 0
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)
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# TODO: FIXME on macOS Python 3.9
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def test_python_to_cpp_to_python_from_process():
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"""Makes sure there is no GIL deadlock when using processes.
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This test is for completion, but it was never an issue.
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"""
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assert _run_in_process(_python_to_cpp_to_python) == 0
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def test_cross_module_gil():
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"""Makes sure that the GIL can be acquired by another module from a GIL-released state."""
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m.test_cross_module_gil() # Should not raise a SIGSEGV
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