Vendor deps.

vendor/pyo3-ffi/src/cpython/lock.rs

@@ -0,0 +1,26 @@
+#[cfg(Py_3_14)]
+use core::ffi::c_int;
+use core::sync::atomic::AtomicU8;
+
+#[repr(transparent)]
+#[derive(Debug)]
+pub struct PyMutex {
+    pub(crate) _bits: AtomicU8,
+}
+
+// we don't impl Default because PyO3's safe wrappers don't need it
+#[allow(clippy::new_without_default)]
+impl PyMutex {
+    pub const fn new() -> PyMutex {
+        PyMutex {
+            _bits: AtomicU8::new(0),
+        }
+    }
+}
+
+extern_libpython! {
+    pub fn PyMutex_Lock(m: *mut PyMutex);
+    pub fn PyMutex_Unlock(m: *mut PyMutex);
+    #[cfg(Py_3_14)]
+    pub fn PyMutex_IsLocked(m: *mut PyMutex) -> c_int;
+}