Issue #11836: document and expose multiprocessing.SimpleQueue

Doc/library/multiprocessing.rst

@@ -483,7 +483,7 @@ primitives like locks.
 For passing messages one can use :func:`Pipe` (for a connection between two
 processes) or a queue (which allows multiple producers and consumers).
 
-The :class:`Queue` and :class:`JoinableQueue` types are multi-producer,
+The :class:`Queue`, :class:`SimpleQueue` and :class:`JoinableQueue` types are multi-producer,
 multi-consumer FIFO queues modelled on the :class:`queue.Queue` class in the
 standard library.  They differ in that :class:`Queue` lacks the
 :meth:`~queue.Queue.task_done` and :meth:`~queue.Queue.join` methods introduced
@@ -629,6 +629,23 @@ For an example of the usage of queues for interprocess communication see
       exits -- see :meth:`join_thread`.
 
 
+.. class:: SimpleQueue()
+
+   It is a simplified :class:`Queue` type, very close to a locked :class:`Pipe`.
+
+   .. method:: empty()
+
+      Return ``True`` if the queue is empty, ``False`` otherwise.
+
+   .. method:: get()
+
+      Remove and return an item from the queue.
+
+   .. method:: put(item)
+
+      Put *item* into the queue.
+
+
 .. class:: JoinableQueue([maxsize])
 
    :class:`JoinableQueue`, a :class:`Queue` subclass, is a queue which

Lib/multiprocessing/__init__.py

@@ -48,7 +48,7 @@ __all__ = [
     'Manager', 'Pipe', 'cpu_count', 'log_to_stderr', 'get_logger',
     'allow_connection_pickling', 'BufferTooShort', 'TimeoutError',
     'Lock', 'RLock', 'Semaphore', 'BoundedSemaphore', 'Condition',
-    'Event', 'Queue', 'JoinableQueue', 'Pool', 'Value', 'Array',
+    'Event', 'Queue', 'SimpleQueue', 'JoinableQueue', 'Pool', 'Value', 'Array',
     'RawValue', 'RawArray', 'SUBDEBUG', 'SUBWARNING',
     ]
 
@@ -223,6 +223,13 @@ def JoinableQueue(maxsize=0):
     from multiprocessing.queues import JoinableQueue
     return JoinableQueue(maxsize)
 
+def SimpleQueue():
+    '''
+    Returns a queue object
+    '''
+    from multiprocessing.queues import SimpleQueue
+    return SimpleQueue()
+
 def Pool(processes=None, initializer=None, initargs=(), maxtasksperchild=None):
     '''
     Returns a process pool object