Thread Safety - C# / C Sharp

softwareakash

Thread Safety

I wrote a small class library written in C# which writes log messages
to a log file.
Everything works fine when one ASP.net application uses this dll to
write text strings.
The problem starts when 2 or more applications ( ASP.net or Console )
uses this dll simultaneously and try to write a lot of messages (
around 10000 ).

I get error that the text file is being used by other process.
In my final application this dll will be used for logging and it should
handle unlimited number of user .

I want to make it completely thread safe so that any number of
different applications can parallaly write to the same text file.

I tried to use lock and synchronized methods etc but nothing is
working.
For writing to the text file I am using StreamWriter class.
I am using VS2005

Can anybody help?

Regards
Akash

Jul 11 '06 #1

Subscribe Reply

2239

Markus Stoeger

softwareakash wrote:

I get error that the text file is being used by other process.
In my final application this dll will be used for logging and it should
handle unlimited number of user .

I want to make it completely thread safe so that any number of
different applications can parallaly write to the same text file.

I tried to use lock and synchronized methods etc but nothing is
working.

lock/Monitor only works within the current process. Use the Mutex class
for interprocess synchronization.

hth,
Max

Jul 11 '06 #2

Jon Skeet [C# MVP]

softwareakash <so***********@gmail.comwrote:

<snip>

I want to make it completely thread safe so that any number of
different applications can parallaly write to the same text file.

This isn't a matter of *thread* safety, it's a matter of *process*
safety. You could (as Markus mentioned) use mutexes. Another
alternative is to have a single process running which actually writes
to the files, and use sockets (or some other IPC channel) to make the
other applications talk to that process.

--
Jon Skeet - <sk***@pobox.com>
http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
If replying to the group, please do not mail me too

Jul 11 '06 #3

Alvin Bruney [MVP]

why re-invent the wheel? really? the wheel already works in the situation
you want it and it's been tested in the enterprise. That wheel is the
enterprise library logging application block. it will log simple and
efficiently and scale well across process. finally, it's a free utility
available from microsoft.

--
________________________
Warm regards,
Alvin Bruney [MVP ASP.NET]

[Shameless Author plug]
Professional VSTO.NET - Wrox/Wiley
The O.W.C. Black Book with .NET
www.lulu.com/owc, Amazon
Blog: http://www.msmvps.com/blogs/alvin
-------------------------------------------------------
"softwareakash" <so***********@gmail.comwrote in message
news:11**********************@p79g2000cwp.googlegr oups.com...

Thread Safety

I wrote a small class library written in C# which writes log messages
to a log file.
Everything works fine when one ASP.net application uses this dll to
write text strings.
The problem starts when 2 or more applications ( ASP.net or Console )
uses this dll simultaneously and try to write a lot of messages (
around 10000 ).

I get error that the text file is being used by other process.
In my final application this dll will be used for logging and it should
handle unlimited number of user .

I want to make it completely thread safe so that any number of
different applications can parallaly write to the same text file.

I tried to use lock and synchronized methods etc but nothing is
working.
For writing to the text file I am using StreamWriter class.
I am using VS2005

Can anybody help?

Regards
Akash

Jul 13 '06 #4

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