How to lock a file?

[Mark Guo]

Hi guys
I encountered a problem, when my server side writing a file name "A".txt not finished, the user side begin to read my "A".txt file, so the user get the file not perfect, please give me a solution to solve this problem and how to make the file be thread safe?
Thanks in advance!

[Chris Hurst]

This isn't read a threading question I suggest you try one of the other forums, your actually trying to make it process safe I believe. Also mentioning which OS your on will help.