(not) Threadsafe Events


"Callbacks" (usually events in C#) have always been problematic for multithreaded programming. This is because a good rule of thumb for component design is: Do your best to allow the event handler to do anything. Since "communicate with another thread that is attempting to take any lock" is one example of "anything", a natural corollary of this rule is: Never hold locks during callbacks.

A general-purpose solution does not exist, and all other solutions have serious drawbacks (placing severe restrictions on the actions available to the event handler).

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Tomasz Kulig