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Here's the scenario:
Is it possible to do such a thing ?
If not, is there another way to do such a thing ?
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You need a single stream, opened for both reading and writing. NG. The combination of ReadAllText / WriteAllText will have the same problem (another process can access the file in between). A single FileStream works, though.
If you try to read at the same time someone else is writing, that's perfectly OK. The only issue is if you are trying to read a block that the writer is writing at the same time. In that cause, the data you get is unpredictable but you should be able to read.
Most likely, you'll have to make your program open the file, read a small chunk, close the file, and then wait for a bit before reading again. Even then, there's no guarantee that you won't have the file open when the writing process tries to write.
You can both read and write to it, but the original contents are lost.
The problem you mention is a famous Producer Consumer Problem
Common solution to this is to use BlockingQueue
An example of real world usage is in AjaxYahooSearchEngineMonitor
What Thread A does is, it will submit a string to queue, and then return immediately.
What Thread B does is, it will pick up the item from queue one by one, and process them. When there is no item in the queue, Thread B will just wait there. See line 83 of the source code.
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