Multiple Simultaneous open .csv file operations

I am trying to write to multiple csv files simultaneously while having them read as they are updated by another instance of MATLAB. I can do this with one file at a time or with sequential updateing, but my aim so to update them in unison. The purpose of this is to emulate a system feeding streaming data into my script via multiple csv files. I have tried to write them useing a parfor loop which does do simultaneous writing but locks the files so they are inaccessable to the second instance. Does MATLAB support this kind of functionality and if so what methods are used to achieve it?

[Madhav Thakker]

Are you able to read a csv file while it is being updated by another instance of MATLAB?

[Richard Garner]

I am but I'm trying to avoid file IO.

Answer 1

[Walter Roberson]

which does do simultaneous writing but locks the files so they are inaccessable to the second instance

That tells us that you are using MS Windows. The locking is coming from MS Windows, and it is automatic, and the locks are mandatory locks unless the process doing the I/O operation specifically asks that the file not be locked.

MATLAB does not in itself offer any operations to turn off file locking.

The tip at https://www.technipages.com/windows-how-to-release-file-lock can possibly be used.