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pg_atomic_exchange_u32() in ProcArrayGroupClearXid() - Mailing list pgsql-hackers
From
Alexander Korotkov
Subject
pg_atomic_exchange_u32() in ProcArrayGroupClearXid()
Date
September 21, 2018
20:35:28
Msg-id
CAPpHfdtxLsC-bqfxFcHswZ91OxXcZVNDBBVfg9tAWU0jvn1tQA@mail.gmail.com
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Re: pg_atomic_exchange_u32() in ProcArrayGroupClearXid()
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Hi!
While investigating ProcArrayGroupClearXid() code I wonder why do we have this loop instead of plain pg_atomic_exchange_u32() call? Is it intentional?
/*
* Now that we've got the lock, clear the list of processes waiting for
* group XID clearing, saving a pointer to the head of the list. Trying
* to pop elements one at a time could lead to an ABA problem.
*/
while (true)
{
nextidx = pg_atomic_read_u32(&procglobal->procArrayGroupFirst);
if (pg_atomic_compare_exchange_u32(&procglobal->procArrayGroupFirst,
&nextidx,
INVALID_PGPROCNO))
break;
}
------
Alexander Korotkov
Postgres Professional:
http://www.postgrespro.com
The Russian Postgres Company
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