A drained MpscQueue node goes onto a free stack shared by every queue of the same type, and a
producer takes that stack whole when its own thread's list runs dry, so once warmed up a push
no longer allocates. That takes the heap allocation back off memory block notifications, the
CPU queue, Vulkan deletes and the GL render queue. A unit test runs several producers against
one consumer over two rounds.
The NpSignin dialog's delays run on emulated time and are saved with the state, so the dialog
behaves the same at any speed and under run-ahead. The time since the last save and savestate
goes; only the standalone frontends' exit prompts read it.
libretroadmin
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