• Subject: Re: rec level i/o using toolkit not threadsafe?
  • From: "Alex Garrison" <agarrison@xxxxxxxxxxx>
  • Date: Thu, 30 Dec 1999 08:12:29 -0500

David,

This is very welcome news.  We were pretty startled when the "not thread
safe" messages started appearing in the websphere joblog.  I'm glad the
toolbox developers have already anticipated/handled this issue.

By the way the QMLTTHDACN system value is only in v4r4.    Is there a data
area or something I can create to supress these messages in v4r3?

Alex Garrison

----- Original Message -----
From: <dawall@us.ibm.com>
To: <JAVA400-L@midrange.com>
Sent: Thursday, December 30, 1999 7:35 AM
Subject: Re: rec level i/o using toolkit not threadsafe?


> Just in case you didn't see the reply posted to the forum (I didn't see it
> mirrored here) ...
>
> It is safe to use these method calls with threads. Although the system API
> calls are not thread safe, Toolbox synchronizes all the methods that use
> these APIs. So, as long as you use Toolbox classes, you are protected. If
> you implemented your own native calls, then all bets are off.  Check out
> system value QMLTTHDACN if you want to suppress the messages.
>
> David Wall
> AS/400 Toolbox for Java
>
>
> "Alex Garrison" <agarrison@logtech.com> on 12/23/99 07:25:07 AM
>
> Please respond to JAVA400-L@midrange.com
>
> To:   JAVA400-L@midrange.com
> cc:
> Subject:  rec level i/o using toolkit not threadsafe?
>
>
>
>
> Is anyone out there using the IBM java toolkit record level i/o classes in
> a multithreaded environment (all servlets, for example, are
multithreaded)?
> If so and you using the toolkit RecordFormat or AS400FileRecordDescription
> classes, you may have a problem.  The websphere joblog says one or both of
> these classes is using DSPFD and DSPFFD under the covers to retrieve the
> record format and field descriptions.  These commands are not threadsafe
in
> either v4r3 or v4r4.  You should see messages in your joblog like "Command
> *LIBL/DSPFFD not safe for job with multiple threads." and "Command
> *LIBL/DSPFD not safe for job with multiple threads.".
>
> While the actual i/o to a file may be threadsafe, retrieving the record
> format and field descriptions is NOT.  I cant believe I am going to have
to
> hardcode my file record formats in my java code.  We are using the latest
> mod2 toolbox.  Please tell me this is fixed in the beta mod3 or will be by
> GA?
>
> Alex Garrison
> agarrison@logtech.com
> (423)636-7213
>
>
>
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