Revert kqueue_event_init() change

Don't use a critical section on kqueue_event_init().

Author: vstinner

Misc/NEWS.d/next/Library/2026-06-11-20-09-50.gh-issue-151364.NjsBYJ.rst

@@ -1,2 +1,2 @@
-Add critical sections to :func:`select.kqueue` objects. Patch by Victor
+Fix thread-safety issues in :func:`select.kqueue` objects. Patch by Victor
 Stinner.

Modules/selectmodule.c

@@ -1943,10 +1943,8 @@ kqueue_event_repr(PyObject *op)
 }
 
 static int
-kqueue_event_init_lock_held(PyObject *op, PyObject *args, PyObject *kwds)
+kqueue_event_init(PyObject *op, PyObject *args, PyObject *kwds)
 {
-    _Py_CRITICAL_SECTION_ASSERT_OBJECT_LOCKED(op);
-
     PyObject *pfd;
     static char *kwlist[] = {"ident", "filter", "flags", "fflags",
                              "data", "udata", NULL};
@@ -1990,16 +1988,6 @@ kqueue_event_init_lock_held(PyObject *op, PyObject *args, PyObject *kwds)
     return 0;
 }
 
-static int
-kqueue_event_init(PyObject *op, PyObject *args, PyObject *kwds)
-{
-    int res;
-    Py_BEGIN_CRITICAL_SECTION(self);
-    res = kqueue_event_init_lock_held(op, args, kwds);
-    Py_END_CRITICAL_SECTION();
-    return res;
-}
-
 static PyObject *
 kqueue_event_richcompare(PyObject *lhs, PyObject *rhs, int op)
 {