Is there an easy way to write a function, or a function already written for me, that will allow for a file shared between processes to be appended to safely? This should be done in a way that will make it impossible for two processes to write to it at the same time, using locking, and should be platform-independent.
Performance does not matter because, in the use case I have, we're only talking about one update every few minutes. Simplicity, however, does matter. All I'm trying to do is run a simulation thousands of times on a bunch of different computers sharing an NFS file system and have all of the results end up in one nice plain text file instead of having each instance write to its own file and having to keep track of them and piece them together by hand.
