Saturday, August 31, 2013

ContextBoundObject vs SynchronizationContext, first look

As illustrated in [[threading in c#]], CBO is about "serialize all instance methods". Now I guess the CBO construct relies on SC construct.

SC is about marshalling calls to the GUI thread. There's 1 or zero SC instance for each thread. The GUI thread always has one. The SC instance is automatically created for the GUI thread.

In http://www.codeproject.com/Articles/31971/Understanding-SynchronizationContext-Part-I, I feel the sync context construct is similar to the dispatcher construct. Both are effectively "handles" on the UI message pump. Since other threads can't directly pass "tasks" to the UI thread, they must use a handle like these. Assuming sc1 covers the GUI thread, sc1.Post (some_delegate) is like Dispatcher.BeginInvoke(some_delegate)

Similar to Thread.CurrentThread static property, SC.Current is a static property. Thread1 Calling SynchronizationContext.Current would get object1, while Thread2 calling SynchronizationContext.Current will get object2.

http://stackoverflow.com/questions/1949789/using-synchronizationcontext-for-sending-events-back-to-the-ui-for-winforms-or-w advocates WPF Dispatcher instead of SC

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