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gh-104341: Call _PyEval_ReleaseLock() with NULL When Finalizing the Current Thread #105109

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Merged
ericsnowcurrently merged 7 commits into from
Jun 1, 2023
Merged

gh-104341: Call _PyEval_ReleaseLock() with NULL When Finalizing the Current Thread #105109

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5206f3d
Call _PyEval_ReleaseLock() with NULL when finalizing the current thread.
ericsnowcurrently May 30, 2023
db6d7ac
Temporarily adjust tstate->_status.cleared during interpreter_clear().
ericsnowcurrently May 30, 2023
a374f48
Disable the broken asserts.
ericsnowcurrently May 30, 2023
432db0c
Add a note about the race in drop_gil().
ericsnowcurrently May 31, 2023
1280e0d
Fix a typo.
ericsnowcurrently May 31, 2023
cc1f2fe
Clarify a comment.
ericsnowcurrently May 31, 2023
b64b299
minor comment typo fix.
gpshead Jun 1, 2023
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Temporarily adjust tstate->_status.cleared during interpreter_clear().
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@ericsnowcurrently
ericsnowcurrently committed May 30, 2023
commit db6d7ac54435dae0b56bbdefcc8f81a9ebd028dc
12 changes: 12 additions & 0 deletions Python/pystate.c
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Original file line number Diff line number Diff line change
Expand Up @@ -822,6 +822,12 @@ interpreter_clear(PyInterpreterState *interp, PyThreadState *tstate)
p = p->next;
HEAD_UNLOCK(runtime);
}
if (tstate->interp == interp) {
/* We fix tstate->_status below we we for sure aren't using it
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(e.g. no longer need the GIL). */
// XXX Eliminate the need to do this.
tstate->_status.cleared = 0;
}

/* It is possible that any of the objects below have a finalizer
that runs Python code or otherwise relies on a thread state
Expand Down Expand Up @@ -886,6 +892,12 @@ interpreter_clear(PyInterpreterState *interp, PyThreadState *tstate)
Py_CLEAR(interp->builtins);
Py_CLEAR(interp->interpreter_trampoline);

if (tstate->interp == interp) {
/* We are now safe to fix tstate->_status.cleared. */
// XXX Do this (much) earlier?
tstate->_status.cleared = 1;
}

for (int i=0; i < DICT_MAX_WATCHERS; i++) {
interp->dict_state.watchers[i] = NULL;
}
Expand Down