How to parallel read file in directory?

[PapyRef]

I have 3 templates (T1,T2 & T3) that read files in a same directory.

When template T1 read one file, should not templates T2 & T3 read the same file.
And when T2 read one file, should not templates T1 & T3 read the same file. etc ....

Reading the file must be unique.

Have you some ideas to that ?

 

[rostonix]

You can delete file after you te data from it and save it again when project is over (with good/bad end)