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---
prelude: >
This release includes optional support for fair locks. When fair locks
are specified, blocking waiters will acquire the lock in the order that
they blocked.
features:
- |
We now have optional support for ``fair`` locks. When fair locks are
specified, blocking waiters will acquire the lock in the order that they
blocked. This can be useful to ensure that existing blocked waiters do
not wait indefinitely in the face of large numbers of new attempts to
acquire the lock. When specifying locks as both ``external`` and ``fair``,
the ordering *within* a given process will be fair, but the ordering
*between* processes will be determined by the behaviour of the underlying
OS.
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