10000 bpo-44991: Make GIL handling more explicit in `sqlite3` callbacks by erlend-aasland · Pull Request #27934 · python/cpython · GitHub
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bpo-44991: Make GIL handling more explicit in sqlite3 callbacks #27934

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Merged
merged 3 commits into from
Aug 31, 2021
Merged

bpo-44991: Make GIL handling more explicit in sqlite3 callbacks #27934

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e4f4679
Acquire GIL at the very start of callbacks; release at the very end
Aug 24, 2021
2a2152d
Add explanatory comment about mysterious PyErr_Occurred()
Aug 31, 2021
d42eb38
Address review
Aug 31, 2021
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Address review 
- since _destructor is a callback, wrap it in GIL lock/unlock
- remove GIL lock/unlock from create_callback_context()
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Erlend E. Aasland committed Aug 31, 2021
commit d42eb38fa8935145c3562570acf3481a64b1b616
18 changes: 9 additions & 9 deletions Modules/_sqlite/connection.c
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Original file line number Diff line number Diff line change
Expand Up @@ -781,34 +781,34 @@ static void _pysqlite_drop_unused_cursor_references(pysqlite_Connection* self)
static callback_context *
create_callback_context(pysqlite_state *state, PyObject *callable)
{
PyGILState_STATE gstate = PyGILState_Ensure();
callback_context *ctx = PyMem_Malloc(sizeof(callback_context));
if (ctx != NULL) {
ctx->callable = Py_NewRef(callable);
ctx->state = state;
}
PyGILState_Release(gstate);
return ctx;
}

static void
free_callback_context(callback_context *ctx)
{
assert(ctx != NULL);
Py_DECREF(ctx->callable);
PyMem_Free(ctx);
}

static void
_destructor(void *ctx)
{
if (ctx != NULL) {
// This function may be called without the GIL held, so we need to
// ensure that we destroy 'ctx' with the GIL held.
PyGILState_STATE gstate = PyGILState_Ensure();
Py_DECREF(ctx->callable);
PyMem_Free(ctx);
free_callback_context((callback_context *)ctx);
PyGILState_Release(gstate);
}
}

static void _destructor(void* args)
{
free_callback_context((callback_context *)args);
}

/*[clinic input]
_sqlite3.Connection.create_function as pysqlite_connection_create_function

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