venv added, updated

myenv/lib/python3.12/site-packages/reactivex/disposable/serialdisposable.py

@@ -0,0 +1,58 @@
+from threading import RLock
+from typing import Optional
+
+from reactivex import abc
+
+
+class SerialDisposable(abc.DisposableBase):
+    """Represents a disposable resource whose underlying disposable
+    resource can be replaced by another disposable resource, causing
+    automatic disposal of the previous underlying disposable resource.
+    """
+
+    def __init__(self) -> None:
+        self.current: Optional[abc.DisposableBase] = None
+        self.is_disposed = False
+        self.lock = RLock()
+
+        super().__init__()
+
+    def get_disposable(self) -> Optional[abc.DisposableBase]:
+        return self.current
+
+    def set_disposable(self, value: abc.DisposableBase) -> None:
+        """If the SerialDisposable has already been disposed, assignment
+        to this property causes immediate disposal of the given
+        disposable object. Assigning this property disposes the previous
+        disposable object."""
+
+        old: Optional[abc.DisposableBase] = None
+
+        with self.lock:
+            should_dispose = self.is_disposed
+            if not should_dispose:
+                old = self.current
+                self.current = value
+
+        if old is not None:
+            old.dispose()
+
+        if should_dispose and value is not None:
+            value.dispose()
+
+    disposable = property(get_disposable, set_disposable)
+
+    def dispose(self) -> None:
+        """Disposes the underlying disposable as well as all future
+        replacements."""
+
+        old: Optional[abc.DisposableBase] = None
+
+        with self.lock:
+            if not self.is_disposed:
+                self.is_disposed = True
+                old = self.current
+                self.current = None
+
+        if old is not None:
+            old.dispose()