When is it okay to check if a file exists?

Question

File systems are volatile. This means that you can\'t trust the result of one operation to still be valid for the next one, even if it\'s the next line of code. You can\'t

Answer 1

Your problem could easily be solved with basic computer science... read up on Semaphores.

(I did not mean to sound like a jerk, I was just pointing you to a simple answer for a common problem).