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venv/lib/python3.12/site-packages/eventlet/lock.py

@@ -0,0 +1,37 @@
+from eventlet import hubs
+from eventlet.semaphore import Semaphore
+
+
+class Lock(Semaphore):
+
+    """A lock.
+    This is API-compatible with :class:`threading.Lock`.
+
+    It is a context manager, and thus can be used in a with block::
+
+      lock = Lock()
+      with lock:
+        do_some_stuff()
+    """
+
+    def release(self, blocking=True):
+        """Modify behaviour vs :class:`Semaphore` to raise a RuntimeError
+        exception if the value is greater than zero. This corrects behaviour
+        to realign with :class:`threading.Lock`.
+        """
+        if self.counter > 0:
+            raise RuntimeError("release unlocked lock")
+
+        # Consciously *do not* call super().release(), but instead inline
+        # Semaphore.release() here. We've seen issues with logging._lock
+        # deadlocking because garbage collection happened to run mid-release
+        # and eliminating the extra stack frame should help prevent that.
+        # See https://github.com/eventlet/eventlet/issues/742
+        self.counter += 1
+        if self._waiters:
+            hubs.get_hub().schedule_call_global(0, self._do_acquire)
+        return True
+
+    def _at_fork_reinit(self):
+        self.counter = 1
+        self._waiters.clear()