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Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=2807 The Queue.empty() method is not reliable in the multiple process runtime environment. This patch uses a new method to check if all modules are processed and workers need to be stopped. That is to add a None item at the bottom of the queue. Worker check if it gets that None item to know if all the module is processed. Signed-off-by: Bob Feng <bob.c.feng@intel.com> Cc: Liming Gao <liming.gao@intel.com> Cc: Yuwei Chen <yuwei.chen@intel.com> Cc: Lucy Yan <lucyyan@google.com> Reviewed-by: Liming Gao <liming.gao@intel.com>