Fix issue python#17707: multiprocessing.Queue's get() method does not block for short timeouts.

Author: giampaolo

Lib/multiprocessing/connection.py

@@ -862,7 +862,7 @@ def wait(object_list, timeout=None):
     if hasattr(select, 'poll'):
         def _poll(fds, timeout):
             if timeout is not None:
-                timeout = int(timeout) * 1000  # timeout is in milliseconds
+                timeout = int(timeout * 1000)  # timeout is in milliseconds
             fd_map = {}
             pollster = select.poll()
             for fd in fds:

Lib/test/test_multiprocessing.py

@@ -699,6 +699,13 @@ def test_task_done(self):
         for p in workers:
             p.join()
 
+    def test_timeout(self):
+        q = multiprocessing.Queue()
+        start = time.time()
+        self.assertRaises(pyqueue.Empty, q.get, True, 0.2)
+        delta = time.time() - start
+        self.assertGreaterEqual(delta, 0.19)
+
 #
 #
 #

Misc/NEWS

@@ -42,6 +42,9 @@ Core and Builtins
 Library
 -------
 
+- Issue #17707: multiprocessing.Queue's get() method does not block for short
+  timeouts.
+
 - Issue #17012: shutil.which() no longer fallbacks to the PATH environment
   variable if empty path argument is specified.  Patch by Serhiy Storchaka.