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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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3
Python/initconfig.c
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@ -632,6 +632,7 @@ _PyConfig_InitCompatConfig(PyConfig *config)
config->check_hash_pycs_mode = NULL;
config->pathconfig_warnings = -1;
config->_init_main = 1;
config->_isolated_interpreter = 0;
#ifdef MS_WINDOWS
config->legacy_windows_stdio = -1;
#endif
@ -850,6 +851,7 @@ _PyConfig_Copy(PyConfig *config, const PyConfig *config2)
COPY_WSTR_ATTR(check_hash_pycs_mode);
COPY_ATTR(pathconfig_warnings);
COPY_ATTR(_init_main);
COPY_ATTR(_isolated_interpreter);
#undef COPY_ATTR
#undef COPY_WSTR_ATTR
@ -949,6 +951,7 @@ config_as_dict(const PyConfig *config)
SET_ITEM_WSTR(check_hash_pycs_mode);
SET_ITEM_INT(pathconfig_warnings);
SET_ITEM_INT(_init_main);
SET_ITEM_INT(_isolated_interpreter);
return dict;

13
Python/pylifecycle.c
View file

@ -1526,7 +1526,7 @@ Py_Finalize(void)
*/
static PyStatus
new_interpreter(PyThreadState **tstate_p)
new_interpreter(PyThreadState **tstate_p, int isolated_subinterpreter)
{
PyStatus status;
@ -1573,6 +1573,7 @@ new_interpreter(PyThreadState **tstate_p)
if (_PyStatus_EXCEPTION(status)) {
goto error;
}
interp->config._isolated_interpreter = isolated_subinterpreter;
status = pycore_interp_init(tstate);
if (_PyStatus_EXCEPTION(status)) {
@ -1606,10 +1607,10 @@ error:
}
PyThreadState *
Py_NewInterpreter(void)
_Py_NewInterpreter(int isolated_subinterpreter)
{
PyThreadState *tstate = NULL;
PyStatus status = new_interpreter(&tstate);
PyStatus status = new_interpreter(&tstate, isolated_subinterpreter);
if (_PyStatus_EXCEPTION(status)) {
Py_ExitStatusException(status);
}
@ -1617,6 +1618,12 @@ Py_NewInterpreter(void)
}
PyThreadState *
Py_NewInterpreter(void)
{
return _Py_NewInterpreter(0);
}
/* Delete an interpreter and its last thread. This requires that the
given thread state is current, that the thread has no remaining
frames, and that it is its interpreter's only remaining thread.