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If you are on a modern operating system, you cannot do that reliably. Any kind of sleep call is likely to trigger a task switch where the OS puts your process in the background executes another one. And even if you don't sleep, that can still happen.

If you absolutely need such exact timings (what for?) consider using a real-time operating system, and probably not Perl either (Perl does some stuff under the hood that can be harmful when you need exact timings. Examples are re-hashing of hash tables, and freeing variables on scope exit).


In reply to Re: How to sleep 1 microsecond? by moritz
in thread How to sleep 1 microsecond? by sophate

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    [Corion]: ambrus: Most of our "automation" is tied to process exit codes and a shell pipeline :-\
    [LanX]: ... a week later they realized that one of the databases - which recorded how much the other banks due to this bank - was not correctly plugged
    [ambrus]: Corion: I have no problem with exit codes and shell pipeline. My problem is that the current process requires a lot of manual intervention from me, including editing the source codes.
    [ambrus]: (Also a lot of manual intervention by two or three other co-workers, who do other parts of the process.)
    [ambrus]: Some of the manual part is unavoidable, but not all.
    [choroba]: LanX was there a way to recover the numbers from the remaining information?
    [Corion]: LanX: Ow ;)

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