add mutex to protect events_executor current entity collection#2187
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add mutex to protect events_executor current entity collection#2187
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Add mutex to protect events_executor current entity collection and add unit-test.
The mutex is needed because the collection is essentially a list where
refresh_current_collection_from_callback_groupscan add/remove elements andretrieve_entitycan read/remove elements.Added a unit-test that without this PR was failing ~75% of the times and now succeeds.