From: | ITAGAKI Takahiro <itagaki(dot)takahiro(at)oss(dot)ntt(dot)co(dot)jp> |
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To: | Magnus Hagander <magnus(at)hagander(dot)net> |
Cc: | PGSQL-Patches <pgsql-patches(at)postgresql(dot)org> |
Subject: | Re: ecpg threading vs win32 |
Date: | 2007-03-19 00:33:54 |
Message-ID: | 20070319092204.6B50.ITAGAKI.TAKAHIRO@oss.ntt.co.jp |
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Lists: | pgsql-patches |
Magnus Hagander <magnus(at)hagander(dot)net> wrote:
> This patch replaces the pthreads code in ecpg with native win32 threads,
> in order to make it threadsafe. The idea is not to have to download the
> non-standard pthreads library on windows.
>
> Does it seem like it should be doing the right thing? Does somebody have
> a good test-case where ecpg breaks when not built thread-safe? (which
> would then also break when built thread-safe with a broken implementation)
I have two questions about thread-safe ecpg.
Q1. Don't you use CRITICAL_SECTION instead of Mutex (CreateMutex)?
I've heard there is a performance benefit in CRITICAL_SECTION.
If the mutex is shared only in one process, CS might be a better solution.
http://japan.internet.com/developer/img/article/873/17801.gif
http://world.std.com/~jmhart/csmutx.htm
Q2. Do we need to use PQescapeStringConn() instead of PQescapeString()?
PQescapeString() is used to escape literals, and the documentation says
PQescapeStringConn() should be used in multi-threaded client programs.
http://momjian.us/main/writings/pgsql/sgml/libpq-exec.html#LIBPQ-EXEC-ESCAPE-STRING
| PQescapeString can be used safely in single-threaded client programs
| that work with only one PostgreSQL connection at a time
Regards,
---
ITAGAKI Takahiro
NTT Open Source Software Center
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