Currently I have a loop that tries to find an unused filename by adding suffixes to a filename string. Once it fails to find a file, it uses the name that failed to open a new file wit that name. Problem is this code is used in a website and there could be multiple attempts to do the same thing at the same time, so a race condition exists.
How can I keep python from overwriting an existing file, if one is created between the time of the check and the time of the open in the other thread.
I can minimize the chance by randomizing the suffixes, but the chance is already minimized based on parts of the pathname. I want to eliminate that chance with a function that can be told, create this file ONLY if it doesn't exist.
I can use win32 functions to do this, but I want this to work cross platform because it will be hosted on linux in the end.