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gh-99113: Make Sure the GIL is Acquired at the Right Places #104208

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Merged
merged 7 commits into from
May 6, 2023
Merged

gh-99113: Make Sure the GIL is Acquired at the Right Places #104208

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ca1f78e
Add _PyEval_AcquireLock().
ericsnowcurrently Apr 10, 2023
c5d3b2c
Add _PyThreadState_SwapNoGIL().
ericsnowcurrently Apr 10, 2023
2404310
Acquire the GIL when not owned.
ericsnowcurrently Apr 10, 2023
85702ae
Fix a typo.
ericsnowcurrently May 6, 2023
3cc9dc3
Do not release the GIL when not necessary.
ericsnowcurrently May 6, 2023
3104796
Make sure the GIL is held by the current thread in _PyEval_InitGIL().
ericsnowcurrently May 6, 2023
56064c7
Release the GIL after swapping thread states.
ericsnowcurrently May 6, 2023
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Make sure the GIL is held by the current thread in _PyEval_InitGIL().
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@ericsnowcurrently
ericsnowcurrently committed May 6, 2023
commit 3104796f16f3a6e25340fa9247e532d8863ff283
16 changes: 13 additions & 3 deletions Python/ceval_gil.c
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Original file line number Diff line number Diff line change
Expand Up @@ -499,6 +499,15 @@ PyEval_ThreadsInitialized(void)
return _PyEval_ThreadsInitialized();
}

static inline int
current_thread_holds_gil(struct _gil_runtime_state *gil, PyThreadState *tstate)
{
if (((PyThreadState*)_Py_atomic_load_relaxed(&gil->last_holder)) != tstate) {
return 0;
}
return _Py_atomic_load_relaxed(&gil->locked);
}

static void
init_shared_gil(PyInterpreterState *interp, struct _gil_runtime_state *gil)
{
Expand All @@ -525,8 +534,9 @@ _PyEval_InitGIL(PyThreadState *tstate, int own_gil)
if (!own_gil) {
PyInterpreterState *main_interp = _PyInterpreterState_Main();
assert(tstate->interp != main_interp);
init_shared_gil(tstate->interp, main_interp->ceval.gil);
locked = _Py_atomic_load_relaxed(&main_interp->ceval.gil->locked);
struct _gil_runtime_state *gil = main_interp->ceval.gil;
init_shared_gil(tstate->interp, gil);
locked = current_thread_holds_gil(gil, tstate);
}
/* XXX per-interpreter GIL */
else if (!_Py_IsMainInterpreter(tstate->interp)) {
Expand All @@ -537,7 +547,7 @@ _PyEval_InitGIL(PyThreadState *tstate, int own_gil)
init_shared_gil(tstate->interp, main_gil);
// XXX For now we lie.
tstate->interp->ceval.own_gil = 1;
locked = _Py_atomic_load_relaxed(&main_gil->locked);
locked = current_thread_holds_gil(main_gil, tstate);
}
else {
PyThread_init_thread();
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