This is the same game as with the
generichash construction. We want
to protect it with a mutex so
different processes can safely do
work on the same resource.
While here, also move the _update
function onto the dirty scheduler.
It is by far the most expensive
operation, and why it wasn't there
in the first place is odd. This should
unblock the scheduler on long
sign-checks. It also move the
possible mutex block onto the
dirty scheduler thread, away from
the core schedulers, improving
latency in the system as a result.
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