Horton

Re: Thread-unsafe coding in ecpg

Andrew Dunstan <andrew.dunstan@2ndquadrant.com>

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From: Andrew Dunstan <andrew.dunstan@2ndquadrant.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: "Joshua D. Drake" <jd@commandprompt.com>, Andres Freund <andres@anarazel.de>, "Tsunakawa, Takayuki" <tsunakawa.takay@jp.fujitsu.com>, Michael Meskes <meskes@postgresql.org>, "pgsql-hackers@lists.postgresql.org" <pgsql-hackers@lists.postgresql.org>
Date: 2019-01-24T00:28:36Z
Lists: pgsql-hackers 
On 1/23/19 6:01 PM, Tom Lane wrote:
> Andrew Dunstan <andrew.dunstan@2ndquadrant.com> writes:
>> I have just spent a large amount of time testing the committed fix with
>> a number of versions of gcc. It blows up on any compiler modern enough
>> to know about _configthreadlocale
> Bleah.  Since the regular Windows buildfarm members seem happy, this
> evidently means that MinGW's _configthreadlocale is broken in some way.
>
> I suppose we could just remove the autoconf test and build without
> _configthreadlocale on MinGW, but that's kind of sad ...
>
> Perhaps there's some sort of setup that MinGW's version needs that
> we're not doing?


This seems to suggest something worse: https://reviews.llvm.org/D40181


Not sure I fully understand what's happening here, though.


cheers


andrew


-- 
Andrew Dunstan                https://www.2ndQuadrant.com
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services

Commits

  1. Remove _configthreadlocale() calls in ecpg test suite.

  2. Remove infinite-loop hazards in ecpg test suite.

  3. Blind attempt to fix _configthreadlocale() failures on MinGW.

  4. Avoid thread-safety problem in ecpglib.

  5. Second try at fixing ecpglib thread-safety problem.