Future: reduce scoped_lock in cancel
Future: reduce scoped_lock in cancel

Change-Id: If81b1bcc0ccd450a15d4dca95b47369f52160f57
Reviewed-on: http://gerrit.aldebaran.lan/54440
Reviewed-by: pdaouadi <fc1eb3334d3fdad315bae23aa166bc70bd434067@aldebaran-robotics.com>
Tested-by: pdaouadi <fc1eb3334d3fdad315bae23aa166bc70bd434067@aldebaran-robotics.com>

aldebaran/libqi,aldebaran/libqi,aldebaran/libqi,vbarbaresi/libqi,bsautron/libqi