make the _bits field of PyMutex pub(crate)

Author: ngoldbaum

pyo3-ffi/src/cpython/lock.rs

@@ -3,7 +3,7 @@ use std::sync::atomic::AtomicU8;
 
 #[repr(C)]
 pub struct PyMutex {
-    _bits: AtomicU8,
+    pub(crate) _bits: AtomicU8,
 }
 
 impl fmt::Debug for PyMutex {

pyo3-ffi/src/object.rs

@@ -5,7 +5,7 @@ use std::mem;
 use std::os::raw::{c_char, c_int, c_uint, c_ulong, c_void};
 use std::ptr;
 #[cfg(Py_GIL_DISABLED)]
-use std::sync::atomic::{AtomicIsize, AtomicU32, Ordering::Relaxed};
+use std::sync::atomic::{AtomicIsize, AtomicU32, AtomicU8, Ordering::Relaxed};
 
 #[cfg(Py_LIMITED_API)]
 opaque_struct!(PyTypeObject);
@@ -42,7 +42,9 @@ pub const fn PyObject_HEAD_INIT() -> PyObject {
         #[cfg(Py_GIL_DISABLED)]
         _padding: 0,
         #[cfg(Py_GIL_DISABLED)]
-        ob_mutex: unsafe { mem::zeroed::<PyMutex>() },
+        ob_mutex: PyMutex {
+            _bits: AtomicU8::new(0),
+        },
         #[cfg(Py_GIL_DISABLED)]
         ob_gc_bits: 0,
         #[cfg(Py_GIL_DISABLED)]