Fix issue 10527: make multiprocessing use poll() instead of select() if available.

Lib/multiprocessing/connection.py

@@ -509,6 +509,27 @@ if sys.platform != 'win32':
         return c1, c2
 
 else:
+    if hasattr(select, 'poll'):
+        def _poll(fds, timeout):
+            if timeout is not None:
+                timeout = int(timeout) * 1000  # timeout is in milliseconds
+            fd_map = {}
+            pollster = select.poll()
+            for fd in fds:
+                pollster.register(fd, select.POLLIN)
+                if hasattr(fd, 'fileno'):
+                    fd_map[fd.fileno()] = fd
+                else:
+                    fd_map[fd] = fd
+            ls = []
+            for fd, event in pollster.poll(timeout):
+                if event & select.POLLNVAL:
+                    raise ValueError('invalid file descriptor %i' % fd)
+                ls.append(fd_map[fd])
+            return ls
+    else:
+        def _poll(fds, timeout):
+            return select.select(fds, [], [], timeout)[0]
 
     def Pipe(duplex=True):
         '''