commit 4835f17c247cc9687c59f2faa6f69573f90d876e
author Guido van Rossum <guido@python.org> Fri Jan 10 13:28:59 2014 -0800
committer Guido van Rossum <guido@python.org> Fri Jan 10 13:28:59 2014 -0800
tree d892806efee6795730f93a25d3d7b361548726ce
parent efef9d3f25b5070a6430259fd3b5703e94c7843d

asyncio: Fix race in subprocess transport, by Victor Stinner.

Lib/asyncio/unix_events.py

diff --git a/Lib/asyncio/unix_events.py b/Lib/asyncio/unix_events.py
index eb3fb9f..80a98f8 100644
--- a/Lib/asyncio/unix_events.py
+++ b/Lib/asyncio/unix_events.py
@@ -160,9 +160,10 @@
             transp = _UnixSubprocessTransport(self, protocol, args, shell,
                                               stdin, stdout, stderr, bufsize,
                                               extra=None, **kwargs)
+            yield from transp._post_init()
             watcher.add_child_handler(transp.get_pid(),
                                       self._child_watcher_callback, transp)
-        yield from transp._post_init()
+
         return transp
 
     def _child_watcher_callback(self, pid, returncode, transp):