read/write semiphores?

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#2423

From: Robert G. Hoover
Date: Fri, 02 Mar 2007 03:20

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Hi,

What's the best way to guard against one program writing to a file when another
program is reading the same file?

In my app, I use TStringList::LoadFromFile() to read in the contents of a
particular file. I manipulate the contents to my liking and then save the file
back to the disk using TStringList::SaveToFile(). In another app, I also read in
the contents of the same file, append additional contents to it, and then save
the amended file to the disk under the same name. I need to make sure that no
additions are lost because it happens at just the wrong time after my first app
reads the file but before my first app saves the revised file. I'm pretty sure I
can use a marker file, but I was hoping for a more elegant method.

Thanks!

Rob

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