[Mono-winforms-list] [PATCH] Additional locking in Carbon XplatUI driver

[Dick Porter]

Hi All

I've observed NullReferenceExceptions from
System.Windows.Forms.XplatUICarbon.GetMessage() (specifically,
MessageQueue.Dequeue() inside GetMessage was randomly returning nulls)
and tracked it down to the locking around MessageQueue.  This patch
ensures that MessageQueue is locked whenever it is modified, completely
curing the exceptions for me.

Is this OK to check into HEAD?

- Dick

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