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https://github.com/python/cpython
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GH-100892: Fix race in clearing threading.local
(#100922)
This commit is contained in:
parent
847d7708ba
commit
762745a124
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@ -3,6 +3,7 @@
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from doctest import DocTestSuite
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from test import support
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from test.support import threading_helper
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from test.support.import_helper import import_module
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import weakref
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# Modules under test
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@ -196,6 +197,18 @@ class X:
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self.assertIsNone(wr())
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def test_threading_local_clear_race(self):
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# See https://github.com/python/cpython/issues/100892
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_testcapi = import_module('_testcapi')
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_testcapi.call_in_temporary_c_thread(lambda: None, False)
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for _ in range(1000):
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_ = threading.local()
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_testcapi.join_temporary_c_thread()
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class ThreadLocalTest(unittest.TestCase, BaseLocalTest):
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_local = _thread._local
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@ -0,0 +1 @@
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Fix race while iterating over thread states in clearing :class:`threading.local`. Patch by Kumar Aditya.
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@ -1879,12 +1879,19 @@ temporary_c_thread(void *data)
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PyThread_release_lock(test_c_thread->exit_event);
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}
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static test_c_thread_t test_c_thread;
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static PyObject *
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call_in_temporary_c_thread(PyObject *self, PyObject *callback)
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call_in_temporary_c_thread(PyObject *self, PyObject *args)
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{
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PyObject *res = NULL;
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test_c_thread_t test_c_thread;
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PyObject *callback = NULL;
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long thread;
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int wait = 1;
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if (!PyArg_ParseTuple(args, "O|i", &callback, &wait))
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{
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return NULL;
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}
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test_c_thread.start_event = PyThread_allocate_lock();
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test_c_thread.exit_event = PyThread_allocate_lock();
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@ -1910,6 +1917,10 @@ call_in_temporary_c_thread(PyObject *self, PyObject *callback)
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PyThread_acquire_lock(test_c_thread.start_event, 1);
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PyThread_release_lock(test_c_thread.start_event);
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if (!wait) {
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Py_RETURN_NONE;
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}
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Py_BEGIN_ALLOW_THREADS
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PyThread_acquire_lock(test_c_thread.exit_event, 1);
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PyThread_release_lock(test_c_thread.exit_event);
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@ -1919,13 +1930,32 @@ call_in_temporary_c_thread(PyObject *self, PyObject *callback)
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exit:
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Py_CLEAR(test_c_thread.callback);
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if (test_c_thread.start_event)
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if (test_c_thread.start_event) {
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PyThread_free_lock(test_c_thread.start_event);
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if (test_c_thread.exit_event)
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test_c_thread.start_event = NULL;
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}
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if (test_c_thread.exit_event) {
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PyThread_free_lock(test_c_thread.exit_event);
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test_c_thread.exit_event = NULL;
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}
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return res;
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}
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static PyObject *
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join_temporary_c_thread(PyObject *self, PyObject *Py_UNUSED(ignored))
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{
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Py_BEGIN_ALLOW_THREADS
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PyThread_acquire_lock(test_c_thread.exit_event, 1);
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PyThread_release_lock(test_c_thread.exit_event);
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Py_END_ALLOW_THREADS
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Py_CLEAR(test_c_thread.callback);
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PyThread_free_lock(test_c_thread.start_event);
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test_c_thread.start_event = NULL;
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PyThread_free_lock(test_c_thread.exit_event);
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test_c_thread.exit_event = NULL;
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Py_RETURN_NONE;
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}
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/* marshal */
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static PyObject*
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@ -3275,8 +3305,9 @@ static PyMethodDef TestMethods[] = {
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METH_VARARGS | METH_KEYWORDS},
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{"with_tp_del", with_tp_del, METH_VARARGS},
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{"create_cfunction", create_cfunction, METH_NOARGS},
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{"call_in_temporary_c_thread", call_in_temporary_c_thread, METH_O,
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{"call_in_temporary_c_thread", call_in_temporary_c_thread, METH_VARARGS,
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PyDoc_STR("set_error_class(error_class) -> None")},
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{"join_temporary_c_thread", join_temporary_c_thread, METH_NOARGS},
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{"pymarshal_write_long_to_file",
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pymarshal_write_long_to_file, METH_VARARGS},
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{"pymarshal_write_object_to_file",
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@ -839,6 +839,11 @@ local_traverse(localobject *self, visitproc visit, void *arg)
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return 0;
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}
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#define HEAD_LOCK(runtime) \
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PyThread_acquire_lock((runtime)->interpreters.mutex, WAIT_LOCK)
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#define HEAD_UNLOCK(runtime) \
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PyThread_release_lock((runtime)->interpreters.mutex)
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static int
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local_clear(localobject *self)
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{
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@ -849,18 +854,23 @@ local_clear(localobject *self)
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/* Remove all strong references to dummies from the thread states */
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if (self->key) {
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PyInterpreterState *interp = _PyInterpreterState_GET();
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_PyRuntimeState *runtime = &_PyRuntime;
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HEAD_LOCK(runtime);
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PyThreadState *tstate = PyInterpreterState_ThreadHead(interp);
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for(; tstate; tstate = PyThreadState_Next(tstate)) {
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if (tstate->dict == NULL) {
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continue;
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}
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PyObject *v = _PyDict_Pop(tstate->dict, self->key, Py_None);
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if (v != NULL) {
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Py_DECREF(v);
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}
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else {
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PyErr_Clear();
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HEAD_UNLOCK(runtime);
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while (tstate) {
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if (tstate->dict) {
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PyObject *v = _PyDict_Pop(tstate->dict, self->key, Py_None);
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if (v != NULL) {
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Py_DECREF(v);
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}
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else {
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PyErr_Clear();
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}
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}
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HEAD_LOCK(runtime);
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tstate = PyThreadState_Next(tstate);
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HEAD_UNLOCK(runtime);
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}
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}
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return 0;
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