Julie wrote:
> Both of the file-based mechanisms can fail if the two
> processes are pounding on a non-local filesystem.
>
> They also tend to be DOG SLOW.
Agreed. The "semaphore" is the way to go.
Of course unless you're trying to synchronize across multiple systems it
wouldn't make sense to put the above files on say an NFS mounted
partition anyway. If you need your lock cross machine boundries a
"semaphore" would be out as it's only local. In which case you would
probably be stuck with the cross mounted file as your best, if not only
solution. If that is the situation I would suggest using "flock()" which
does work relatively reliably, at least in Sun environments, on NFS
mounted partitions.
- Matt
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