Use an RwLock for AUXILIARY_EVENT_TX
#668
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We expect it to be write locked very rarely, so it should still be pretty cheap to get access to this safely
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Part of #661
We expect it to be write locked very rarely, so it should still be pretty cheap to get access to this safely
As we saw in tracing-subscriber, this is the same kind of mechanism that the layer "handle" uses internally, so hopefully the overhead is quite low.