Its not possible to notice the change of status of an Event() in
the select call we sleep in. It would be possible in python 3.3 but
for now use a pipe instead. This removes small latency when bitbake
commands finish since the system doesn't sit in the select call.
(Debugging these kind of issues is apparent by setting a long sleep
for the select call)
(Bitbake rev: def28239b0f0d5f1cf13214b263114a5328538b7)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
efdc1598d2