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From Ron Grabowski <rongrabow...@yahoo.com>
Subject Re: logging from web service and a web page
Date Tue, 18 Mar 2008 00:01:55 GMT
Two processes cannot have an exclusive lock on a file. The minimal lock (as the name implies)
does in fact lock the file for a short period of time. A mutex is a good way to allow multiple
processes to coordinate file writes:


A similiar locking model will most likely be included in the next release.

----- Original Message ----
From: "Pattenaude, Jerry" <Jerry.Pattenaude@RedPrairie.com>
To: Log4NET User <log4net-user@logging.apache.org>
Sent: Monday, March 17, 2008 2:18:57 PM
Subject: RE: logging from web service and a web page

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I’ve dug into my problem a little
bit more and have some addition information.  I’m still hoping that
someone will have run into this and/or knows this to be a limitation of the
file appender.
 My web service app and my asp.net app are
separate visual studio projects.  Both projects reference log4net.dll.  When
aspnet_wp.exe loads the applications it loads log4net.dll twice into the same aspnet_wp
process, but different app domains.  It appears that even with minimal lock the
file is still locked, so it cannot be used from a different app domain in the
same process.
 Does anyone have any ideas on this?  Is it
a log4net bug?
Sent:Wednesday, March 12, 2008 1:10 PM
Subject: logging from web serviceand a web page
 I have had a web service logging for a while now and it
works great (I’ll call it ws).  The log4net.dll runs in the standard
aspnet_wp.exe and logs using the rollingfileappender with minimal lock.
    <lockingModel type="log4net.Appender.FileAppender+MinimalLock"
 I’ve recently added another module to my site that
does some session management as part of the ASP.Net pipeline.  It is
logging using the same configuration file and the same output file.  Now
the session module is getting created first and all of its log messages are
getting through, but the ws app log messages are not being created.
 I turned on the debug for log4net and am running DebugView
and I get the following
 log4net:ERROR [RollingFileAppender] Unable to acquire lock
on file c:\log\Log.txt. Access to the path 'c:\log\Log.txt' is denied.
 So just to recap the ws messages were getting through. 
I added the session dll and now its messages are getting through and not my ws
messages.  When I remove the session dll then the ws messages start coming
through again.
 Oh and just to add a little more info when I turn on the
Event Log Appender all the messages get logged.
 Do you have any idea what would cause this?
 Thanks in advance,

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