Issue #14059: Implement multiprocessing.Barrier
diff --git a/Lib/multiprocessing/synchronize.py b/Lib/multiprocessing/synchronize.py
index 4502a97..22eabe5 100644
--- a/Lib/multiprocessing/synchronize.py
+++ b/Lib/multiprocessing/synchronize.py
@@ -333,3 +333,43 @@
return False
finally:
self._cond.release()
+
+#
+# Barrier
+#
+
+class Barrier(threading.Barrier):
+
+ def __init__(self, parties, action=None, timeout=None):
+ import struct
+ from multiprocessing.heap import BufferWrapper
+ wrapper = BufferWrapper(struct.calcsize('i') * 2)
+ cond = Condition()
+ self.__setstate__((parties, action, timeout, cond, wrapper))
+ self._state = 0
+ self._count = 0
+
+ def __setstate__(self, state):
+ (self._parties, self._action, self._timeout,
+ self._cond, self._wrapper) = state
+ self._array = self._wrapper.create_memoryview().cast('i')
+
+ def __getstate__(self):
+ return (self._parties, self._action, self._timeout,
+ self._cond, self._wrapper)
+
+ @property
+ def _state(self):
+ return self._array[0]
+
+ @_state.setter
+ def _state(self, value):
+ self._array[0] = value
+
+ @property
+ def _count(self):
+ return self._array[1]
+
+ @_count.setter
+ def _count(self, value):
+ self._array[1] = value