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Re: Basic subtransaction facility

From: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
To: Alvaro Herrera <alvherre(at)dcc(dot)uchile(dot)cl>
Cc: Patches <pgsql-patches(at)postgresql(dot)org>
Subject: Re: Basic subtransaction facility
Date: 2004-04-17 14:03:40
Message-ID: 200404171403.i3HE3eq29362@candle.pha.pa.us (view raw or flat)
Thread:
Lists: pgsql-patches
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Alvaro Herrera wrote:
> Hackers,
> 
> Here is a very preliminar patch that allows the user to say "BEGIN"
> inside a transaction and have the system react accordingly.  This is
> only a modification to xact.c (and slightly to other places to allow it
> to work); the important functions are empty.
> 
> It compiles fine for me with both SUBTRANSACTIONS defined and not
> defined; when not defined, the behavior is the same as the current code.
> Please note that I have made some errors more fatal than they are now,
> as bugs in this code will have much worse effects than a flaw in the
> current transaction system.
> 
> One quick note: there are two ENDABORT states for a subtransaction,
> SUBENDABORT_OK and SUBENDABORT_ERROR.  They signal whether the parent
> transaction should be aborted after the child transaction finishes or
> not:  an aborted subtransaction where the user issues COMMIT should
> abort the parent transaction; if the user issues ROLLBACK, the parent
> can be allowed to continue.
> 
> 
> Please have a look and comment.  This file does not move a lot so I
> don't think it will suffer from a lot of code drift.
> 
> -- 
> Alvaro Herrera (<alvherre[a]dcc.uchile.cl>)
> "I think my standards have lowered enough that now I think 'good design'
> is when the page doesn't irritate the living f*ck out of me." (JWZ)

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-- 
  Bruce Momjian                        |  http://candle.pha.pa.us
  pgman(at)candle(dot)pha(dot)pa(dot)us               |  (610) 359-1001
  +  If your life is a hard drive,     |  13 Roberts Road
  +  Christ can be your backup.        |  Newtown Square, Pennsylvania 19073

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