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gh-105716: Support Background Threads in Subinterpreters Consistently (gh-109921)

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The existence of background threads running on a subinterpreter was preventing interpreters from getting properly destroyed, as well as impacting the ability to run the interpreter again. It also affected how we wait for non-daemon threads to finish.

We add PyInterpreterState.threads.main, with some internal C-API functions.
This commit is contained in:
Eric Snow 2023-10-02 14:12:12 -06:00 • committed by GitHub
parent a040a32ea2
commit 1dd9dee45d
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GPG key ID: 4AEE18F83AFDEB23
11 changed files with 258 additions and 46 deletions
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16
Modules/_threadmodule.c
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@ -1605,6 +1605,18 @@ PyDoc_STRVAR(excepthook_doc,
\n\
Handle uncaught Thread.run() exception.");
static PyObject *
thread__is_main_interpreter(PyObject *module, PyObject *Py_UNUSED(ignored))
{
PyInterpreterState *interp = _PyInterpreterState_GET();
return PyBool_FromLong(_Py_IsMainInterpreter(interp));
}
PyDoc_STRVAR(thread__is_main_interpreter_doc,
"_is_main_interpreter()\n\
\n\
Return True if the current interpreter is the main Python interpreter.");
static PyMethodDef thread_methods[] = {
{"start_new_thread", (PyCFunction)thread_PyThread_start_new_thread,
METH_VARARGS, start_new_doc},
@ -1634,8 +1646,10 @@ static PyMethodDef thread_methods[] = {
METH_VARARGS, stack_size_doc},
{"_set_sentinel", thread__set_sentinel,
METH_NOARGS, _set_sentinel_doc},
{"_excepthook", thread_excepthook,
{"_excepthook", thread_excepthook,
METH_O, excepthook_doc},
{"_is_main_interpreter", thread__is_main_interpreter,
METH_NOARGS, thread__is_main_interpreter_doc},
{NULL, NULL} /* sentinel */
};