8000 Use standard compare_exchange loop style in ProcArrayGroupClearXid(). · postgrespro/postgres_cluster@48cc59e · GitHub
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Use standard compare_exchange loop style in ProcArrayGroupClearXid().
Besides style, this might improve performance in the contended case. Reviewed by Amit Kapila. Discussion: https://postgr.es/m/20191015035348.GA4166224@rfd.leadboat.com
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‎src/backend/storage/ipc/procarray.c

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@@ -493,9 +493,9 @@ ProcArrayGroupClearXid(PGPROC *proc, TransactionId latestXid)
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/* Add ourselves to the list of processes needing a group XID clear. */
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proc->procArrayGroupMember = true;
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proc->procArrayGroupMemberXid = latestXid;
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nextidx = pg_atomic_read_u32(&procglobal->procArrayGroupFirst);
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while (true)
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{
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nextidx = pg_atomic_read_u32(&procglobal->procArrayGroupFirst);
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pg_atomic_write_u32(&proc->procArrayGroupNext, nextidx);
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if (pg_atomic_compare_exchange_u32(&procglobal->procArrayGroupFirst,

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