Commit fe49bea9 authored by Matthew Fernandez's avatar Matthew Fernandez
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use an XCHG instead of locked CMPXCHG during set migration

This somewhat optimises the set migration process, by taking advantage of the
fact that it is fine to write a tombstone to a previously empty slot.

Github: related to #179 "replace cmpxchg with xchg during set migration"
parent cff8c6c9
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