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bpo-40453: Add PyConfig._isolated_subinterpreter (GH-19820)

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An isolated subinterpreter cannot spawn threads, spawn a child
process or call os.fork().

* Add private _Py_NewInterpreter(isolated_subinterpreter) function.
* Add isolated=True keyword-only parameter to
  _xxsubinterpreters.create().
* Allow again os.fork() in "non-isolated" subinterpreters.
This commit is contained in:
Victor Stinner 2020-05-01 11:33:44 +02:00 • committed by GitHub
parent 8bcfd31cc0
commit 252346acd9
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GPG key ID: 4AEE18F83AFDEB23
14 changed files with 68 additions and 12 deletions
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8
Modules/_threadmodule.c
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@ -1085,6 +1085,14 @@ thread_PyThread_start_new_thread(PyObject *self, PyObject *fargs)
"optional 3rd arg must be a dictionary");
return NULL;
}
PyInterpreterState *interp = _PyInterpreterState_GET();
if (interp->config._isolated_interpreter) {
PyErr_SetString(PyExc_RuntimeError,
"thread is not supported for isolated subinterpreters");
return NULL;
}
boot = PyMem_NEW(struct bootstate, 1);
if (boot == NULL)
return PyErr_NoMemory();