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postgres/src/backend
Alexander Korotkov 2f39106a20 Replace CAS loop with single TAS in ProcArrayGroupClearXid()
Single pg_atomic_exchange_u32() is expected to be faster than loop of
pg_atomic_compare_exchange_u32().  Also, it would be consistent with
clog group update code.

Discussion: https://postgr.es/m/CAPpHfdtxLsC-bqfxFcHswZ91OxXcZVNDBBVfg9tAWU0jvn1tQA%40mail.gmail.com
Reviewed-by: Amit Kapila
2018-09-22 16:22:30 +03:00
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