[Mono-bugs] [Bug 672879] ReleaseInterfaces is called by GC thread.

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https://bugzilla.novell.com/show_bug.cgi?id=672879

https://bugzilla.novell.com/show_bug.cgi?id=672879#c16


--- Comment #16 from Robert Jordan <robertj at gmx.net> 2011-09-03 11:26:13 UTC ---
Tom, another small optimization:

private void InitializeApartmentDetails ()
{
single_thread_apartment = Thread.CurrentThread.GetApartmentState() ==
ApartmentState.STA;
synchronization_context = SynchronizationContext.Current;
// Check whether the current context is a plain SynchronizationContext object
// and handle this as if no context was set at all.
if (synchronization_context != null &&
    synchronization_context.GetType () == typeof(SynchronizationContext))
    synchronization_context = null;
}

The idea behind is: the default SynchronizationContext is per spec a free
threaded one, but its Post() implementation is using the ThreadPool to invoke
the delegate so it doesn't block. We don't need this behavior.

This is only for the case that some consumer has set
SynchronizationContext.Current = new SynchronizationContext(). It seems that
Mono's WinForms is doing this during shutdown.

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