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gh-111569: Fix critical sections test on WebAssembly (GH-111897)
This adds a macro `Py_CAN_START_THREADS` that corresponds to the Python function `test.support.threading_helper.can_start_thread()`. WASI and some Emscripten builds do not have a working pthread implementation. This macro is used to guard the critical sections C API tests that require a working threads implementation.
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@ -470,6 +470,14 @@ extern "C" {
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# define WITH_THREAD
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#endif
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/* Some WebAssembly platforms do not provide a working pthread implementation.
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* Thread support is stubbed and any attempt to create a new thread fails.
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*/
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#if (!defined(HAVE_PTHREAD_STUBS) && \
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(!defined(__EMSCRIPTEN__) || defined(__EMSCRIPTEN_PTHREADS__)))
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# define Py_CAN_START_THREADS 1
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#endif
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#ifdef WITH_THREAD
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# ifdef Py_BUILD_CORE
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# ifdef HAVE_THREAD_LOCAL
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@ -170,6 +170,7 @@ thread_critical_sections(void *arg)
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}
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}
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#ifdef Py_CAN_START_THREADS
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static PyObject *
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test_critical_sections_threads(PyObject *self, PyObject *Py_UNUSED(args))
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{
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@ -194,12 +195,15 @@ test_critical_sections_threads(PyObject *self, PyObject *Py_UNUSED(args))
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Py_DECREF(test_data.obj1);
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Py_RETURN_NONE;
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}
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#endif
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static PyMethodDef test_methods[] = {
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{"test_critical_sections", test_critical_sections, METH_NOARGS},
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{"test_critical_sections_nest", test_critical_sections_nest, METH_NOARGS},
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{"test_critical_sections_suspend", test_critical_sections_suspend, METH_NOARGS},
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#ifdef Py_CAN_START_THREADS
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{"test_critical_sections_threads", test_critical_sections_threads, METH_NOARGS},
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#endif
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{NULL, NULL} /* sentinel */
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};
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