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maybe locking the variable before I update it? I was thinking that each thread is updating a different hash key of the variable, so it should be safe to update this way? Or does it need to be locked before each join statement?
All your updates to %Found are done within the same thread, so there is no need to lock anything. Besides which %Found isn't a shared variable, so you couldn't lock it if you tried.
Any suggestions on how to do this better?
Apart from this:
Could be more efficiently written as:
Not really. It is hard to see any scope for you not getting all the results produced by the external commands.
Perhaps you could print out the size of @results before returning and then sum those and compare it with the size of @Final?
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