Re: Unique filenames with Time::HiRes

Another solution, and it is a bit bulkier than the timehighres-PID idea (which is a good one) is just to have a process that sits on a socket and hands out incremental numbers. Then you can launch as many of your file generating scripts in parallel as you want, they will each always be handed a unique number by your script.

daN.

Comment on Re: Unique filenames with Time::HiRes

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Re^2: Unique filenames with Time::HiRes by AcidHawk (Vicar) on Jul 19, 2004 at 14:38 UTC
Hi, I origionally started this way, however when the daemon starts again it restarted the counter, if any previous files still existed, say at num 1001, and I restarted the daemon again, I would start creating files at number 1. This causes the files to be processed in the incorrect order. ----- Of all the things I've lost in my life, its my mind I miss the most.	[reply]
Re^3: Unique filenames with Time::HiRes by waswas-fng (Curate) on Jul 19, 2004 at 16:34 UTC
Why not do a gettimeofday(), test to see if the file name exists, if it does then loop for a few ms, then rinse and repeat until the gettimeofday is unique? -Waswas	[reply]
Re^3: Unique filenames with Time::HiRes by mutated (Monk) on Jul 20, 2004 at 13:14 UTC
It's relatively easy though when the daemon is starting for it to check and make sure it is starting above the last number that exists, it can take it's time because until it starts responding to requests for numbers the programs calling it should just block or whatever.. daN.	[reply]