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gh-128679: Redesign tracemalloc locking (#128888)

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* Use TABLES_LOCK() to protect 'tracemalloc_config.tracing'.
* Hold TABLES_LOCK() longer while accessing tables.
* tracemalloc_realloc() and tracemalloc_free() no longer
  remove the trace on reentrant call.
* _PyTraceMalloc_Stop() unregisters _PyTraceMalloc_TraceRef().
* _PyTraceMalloc_GetTraces() sets the reentrant flag.
* tracemalloc_clear_traces_unlocked() sets the reentrant flag.
This commit is contained in:
Victor Stinner 2025-01-15 21:22:44 +01:00 • committed by GitHub
parent 080f444a58
commit 36c5e3bcc2
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GPG key ID: B5690EEEBB952194
5 changed files with 302 additions and 364 deletions
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18
Modules/_tracemalloc.c
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@ -215,18 +215,14 @@ static struct PyModuleDef module_def = {
PyMODINIT_FUNC
PyInit__tracemalloc(void)
{
PyObject *m;
m = PyModule_Create(&module_def);
if (m == NULL)
return NULL;
#ifdef Py_GIL_DISABLED
PyUnstable_Module_SetGIL(m, Py_MOD_GIL_NOT_USED);
#endif
if (_PyTraceMalloc_Init() < 0) {
Py_DECREF(m);
PyObject *mod = PyModule_Create(&module_def);
if (mod == NULL) {
return NULL;
}
return m;
#ifdef Py_GIL_DISABLED
PyUnstable_Module_SetGIL(mod, Py_MOD_GIL_NOT_USED);
#endif
return mod;
}