Merge pull request #3807 from nouiz/lock

Don't take the lock unless needed at exit

Merge pull request #3807 from nouiz/lock
149a9dff · carriepl · 167df2c4 · 493517e7 · 149a9dff
--- a/theano/gof/cmodule.py
+++ b/theano/gof/cmodule.py