are locks necessary around a single file write instruction?

[bmihura]

I am running 14 processes in parallel in TestStand, and each process will call a the "Write Text File" function occasionally.

Can one process's file write interrupt another one during mid-write, or do I need to put locks around each write?

[RaviShrigiri · Accepted solution]

If you are accessing the same file then lock is required.And that too when you are writing to it.

[bmihura]

OK, thanks. I'll arrange it so that different files are accessed per thread.