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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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5 changed files with 302 additions and 364 deletions
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7
Python/pylifecycle.c
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@ -707,7 +707,12 @@ pycore_create_interpreter(_PyRuntimeState *runtime,
// the settings are loaded (so that feature_flags are set) but before
// any calls are made to obmalloc functions.
if (_PyMem_init_obmalloc(interp) < 0) {
return _PyStatus_NO_MEMORY();
return _PyStatus_NO_MEMORY();
}
status = _PyTraceMalloc_Init();
if (_PyStatus_EXCEPTION(status)) {
return status;
}
PyThreadState *tstate = _PyThreadState_New(interp,