RE: file i/o in multithreaded apps

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Hi Mark,

I agree with Pete that the code here looks quite simple and reasonable
which should work well. For the data that got lost, are they written in
some other particular threads which may has some other synchronizing
operations that may cause it to block or not writing correctly? It would be
helpful, if we can simplify it and track down what kind of data are always
lost. BTW, as Pete mentioned, you'd better not lock on the streamwriter
objecct, but use a simple Object member.

Please feel free to post here if there is anything else you found.

Sincerely,

Steven Cheng

Microsoft MSDN Online Support Lead


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-----------------------------
From: =?Utf-8?B?TWFyaw==?= <mmodrall@xxxxxxxxxxxxx>
Subject: file i/o in multithreaded apps
Date: Mon, 7 Apr 2008 14:54:03 -0700

Hi...

I've got an app that's pretty multi-threaded. While I'm debugging, I'm
trying to write a log file of events that happen, so I've got a global
logger
that has
g_LogFileWriter = new StreamWriter(new FileStream(file, Append, Write.
Share.Read);

void Log2File(string format, params object[] arg)
{
lock (g_LogFileWriter)
{
g_LogFileWriter.WriteLine(format, arg);
g_LogFileWriter.Flush();
}
}

Problem is that when things happen very close together and multiple
threads
call this, lines seem to be getting lost. Is there some timing limit on
how
tight many threads can write to the same file stream?

Thanks
Mark



.

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