Multiple systems writing to single csv file

Question

I am preparing to have two identical test systems that test a single product go into service side by side.  There has been one or the other of these in service for a number of years but due to volume, both must now operate in parallel.
The sticky point on this is that results are written to a CSV file and the file can only be opened by one caller at a time (whether one of the systems or a user).   My first approach is somewhat klunky but I think it may work.
When system 1 is ready to save, it creates a temp file based on it's stand ID.  It then looks for the comparable temp file from system 2. If it sees it, system 1 goes into a loop for what should be adequate time for system 2 to write and exit and then system 1 writes and at the end deletes it's tmp file.  If system 2 tmp file stays longer than the allowed for time, system 1 returns an error to the user that data was not saved and continues on. (same thing on other system with numbers switched)
As I say, it's klunky.
For this product, the csv format is preferred by production and because both machines will be running a single work order, they want the data to go into a single file.
Any alternative methods I should be considering ?
Thanks for any input.
Doug
"My only wish is that I am capable of learning each and every day until my last breath."

Answer 1

I fully agree with RavenFan's idea of making another application just for writing the file.  It greatly simplifies the process.  I would also recommend using the STM library to make the TCP/IP communications easier to understand.
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