Commits on May 3, 2017

1. Fix potential deadlocks when building proxies/registering stubs in ca… …

   …llbacks from events
   
   The Observer design pattern has now been applied in a way that avoids deadlocks,
   has better support for concurrency and provides more natural semantics for the
   client code:
   - An internal mutex is no longer locked while calling back the notify functors (the
   listeners) registered by the user.
   - The non-interference/concurrency relationship between the notification functions
   and the subscribe/unsubscribe functions has remained valid.
   - A new notification iteration can now begin in parallel (e.g.: on another thread)
   with an on-going notification. The notification iterations do not interfere with
   each other.
   - The functor callbacks registered by the user with calls to the subscribe function
   are now deleted by the call to the unsubscribe function (i.e. deterministically from
   the user's point of view), as opposed to being deleted at some point in the future
   when/if a notification  happens to be broadcast again (i.e. nondeterministically
   from the user's point of view).
   - Internally, the implementation of the Event class template has been simplified
   (e.g.: by only using one mutex and by letting go of the subscribe/unsubscribe
   lists) and the code is now easier to understand.

   

   CatalinMihaiGhita authored and Catalin Mihai Ghita committed May 3, 2017
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