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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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7
Modules/posixmodule.c
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@ -6243,9 +6243,10 @@ os_fork_impl(PyObject *module)
/*[clinic end generated code: output=3626c81f98985d49 input=13c956413110eeaa]*/
{
pid_t pid;
if (_PyInterpreterState_GET() != PyInterpreterState_Main()) {
PyErr_SetString(PyExc_RuntimeError, "fork not supported for subinterpreters");
PyInterpreterState *interp = _PyInterpreterState_GET();
if (interp->config._isolated_interpreter) {
PyErr_SetString(PyExc_RuntimeError,
"fork not supported for isolated subinterpreters");
return NULL;
}
if (PySys_Audit("os.fork", NULL) < 0) {