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gh-124218: Use per-thread reference counting for globals and builtins (#125713)

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Use per-thread refcounting for the reference from function objects to
the globals and builtins dictionaries.
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Sam Gross 2024-10-21 12:51:29 -04:00 • committed by GitHub
parent d880c83ff7
commit 9b0bfba2a2
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8 changed files with 115 additions and 11 deletions
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12
Python/uniqueid.c
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@ -1,5 +1,6 @@
#include "Python.h"
#include "pycore_dict.h" // _PyDict_UniqueId()
#include "pycore_lock.h" // PyMutex_LockFlags()
#include "pycore_pystate.h" // _PyThreadState_GET()
#include "pycore_object.h" // _Py_IncRefTotal
@ -98,8 +99,8 @@ _PyObject_AssignUniqueId(PyObject *obj)
return unique_id;
}
static void
release_unique_id(Py_ssize_t unique_id)
void
_PyObject_ReleaseUniqueId(Py_ssize_t unique_id)
{
PyInterpreterState *interp = _PyInterpreterState_GET();
struct _Py_unique_id_pool *pool = &interp->unique_ids;
@ -128,6 +129,11 @@ clear_unique_id(PyObject *obj)
id = co->_co_unique_id;
co->_co_unique_id = -1;
}
else if (PyDict_Check(obj)) {
PyDictObject *mp = (PyDictObject *)obj;
id = _PyDict_UniqueId(mp);
mp->_ma_watcher_tag &= ~(UINT64_MAX << DICT_UNIQUE_ID_SHIFT);
}
return id;
}
@ -136,7 +142,7 @@ _PyObject_DisablePerThreadRefcounting(PyObject *obj)
{
Py_ssize_t id = clear_unique_id(obj);
if (id >= 0) {
release_unique_id(id);
_PyObject_ReleaseUniqueId(id);
}
}