Which file format should I use if I need to edit it from different processes?
Hello! I’m writing a Qt/c++ program that should write and read data on a file, while another process does the same. What file format should I use to prevent conflicts?
I don’t think format matters - if you’ve got multiple processes writing simultaneously, you’ll have a potential for corruption. What you want is a lock file. Basically, you just create a separate file called something like my process.lock. When a process wants to write to the other file, you check if the lock file exists - if yes, wait until it doesn’t; if no, create it. In the lock file, store just the process id of the file that has the lock, so you can also add logic to check if the process exists (if it doesn’t, it probably died - you may have to check the file you’re writing to for corruption/recover). When done writing, delete the file to release the lock.
Add comment