Mailing-List: contact dev-help@tomcat.apache.org; run by ezmlm
Precedence: bulk
Reply-To: "Tomcat Developers List" <dev@tomcat.apache.org>
Received-SPF: pass (nike.apache.org: domain of Chuck.Caldarale@unisys.com
 designates 216.82.250.179 as permitted sender)
From: "Caldarale, Charles R" <Chuck.Caldarale@unisys.com>
To: Tomcat Developers List <dev@tomcat.apache.org>
Date: Wed, 27 Jun 2012 11:49:31 -0500
Subject: RE: Race condition in DefaultServlet
Thread-Topic: Race condition in DefaultServlet
Thread-Index: Ac1UgpYyA+AdoFrFTyq8UhJfDoE4dAAAdTGA
Message-ID: 
 <99C8B2929B39C24493377AC7A121E21FB0320B6E07@USEA-EXCH8.na.uis.unisys.com>
References: 
 <CAJQMMgytsWNd-i6Xge8QMhr8N5cFyO+Fjk+HwVRBNxNs_Nc1VA@mail.gmail.com>
In-Reply-To: 
 <CAJQMMgytsWNd-i6Xge8QMhr8N5cFyO+Fjk+HwVRBNxNs_Nc1VA@mail.gmail.com>
Accept-Language: en-US
Content-Language: en-US
acceptlanguage: en-US
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable
MIME-Version: 1.0

> From: Chris R [mailto:chris.tech.sf@gmail.com]=20
> Subject: Race condition in DefaultServlet

> If multiple threads call doPut(...), there is a possibility that they can
> clobber each other and the value of accessCount may not really give the=20
> exact number of accesses of the cache.

Which is noted in the comments.

> Can someone confirm whether this is a real problem?

Not in the real world.  If the count is off a bit, there's no measurable ha=
rm.  The cost of synchronization outweighs the infinitesimal benefit of hav=
ing a 100% accurate number here.

 - Chuck


THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY MA=
TERIAL and is thus for use only by the intended recipient. If you received =
this in error, please contact the sender and delete the e-mail and its atta=
chments from all computers.


---------------------------------------------------------------------
To unsubscribe, e-mail: dev-unsubscribe@tomcat.apache.org
For additional commands, e-mail: dev-help@tomcat.apache.org