02-25-2009
How are you creating the race condition?
You can easily prevent race conditions by creating a temporary file and using rename() to replace the file after checking the timestamp of the original file.
If only your program is changing the file, you can also use flock(fd, LOCK_EX) so that if another instance of your program also uses flock() it will block until the other instance finishes processing or calls flock(fd, LOCK_UN).
Keep in mind that flock() doesn't prevent file unlink()ing.
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