bitbake: server/process: Optimise latency when finishing idle functions

When idle functions finish, its likely we have some other work
to do, so don't sleep in the select call but instead, skip it.
This removes small amounts of latency in common commands.

(Bitbake rev: 069d6538f83b607cb46c6fe21bf6c596e8b99242)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/server/process.py

@@ -128,6 +128,7 @@ class ProcessServer(Process, BaseImplServer):
                 retval = function(self, data, False)
                 if retval is False:
                     del self._idlefuns[function]
+                    nextsleep = None
                 elif retval is True:
                     nextsleep = None
                 elif nextsleep is None: