snapshot before regression test

includes/spinlock.py

@@ -0,0 +1,18 @@
+import t, c
+import atom
+
+
+@t.Object
+class _spinlock:
+    locked: t.CVolatile | t.CInt
+    name: t.CArray[t.CChar, 32]
+
+    def __init__(self):
+        self.locked = 0
+
+    def lock(self):
+        while atom.__atomic_test_and_set(c.Addr(self.locked), atom.ATOMIC_ACQUIRE):
+            pass
+
+    def unlock(self):
+        atom.__atomic_clear(c.Addr(self.locked), atom.ATOMIC_RELEASE)