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Re: How to sleep 1 microsecond?

by influx (Beadle)
on Aug 17, 2012 at 07:57 UTC ( #987931=note: print w/replies, xml ) Need Help??


in reply to How to sleep 1 microsecond?

Did you actually try nanosleep(1000000); ? I didn't see that in your sample.

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Re^2: How to sleep 1 microsecond?
by davido (Archbishop) on Aug 17, 2012 at 08:06 UTC

    One microsecond should be 1000 nanoseconds.


    Dave

      Hi, the sample codes above use usleep. Here is the program using nanosleep.

      #!/usr/bin/perl use strict; use warnings; use Time::HiRes qw(usleep nanosleep gettimeofday); my @start = gettimeofday (); my $sleep = nanosleep(1000); my @end = gettimeofday (); print "[$sleep][@start][@end]\n"; Results: [1000][1345190945 846575][1345190945 846739]

      Compared with the codes that just get the timestamps two times(without the nanosleep line). The nanosleep actually sleeps much longer than 1 microsecond.

      #!/usr/bin/perl use strict; use warnings; use Time::HiRes qw(usleep nanosleep gettimeofday); my @start = gettimeofday (); my @end = gettimeofday (); print "[@start][@end]\n"; Results: [1345190988 610721][1345190988 610723]
      You're totally right, sorry. I just checked Google!

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[Corion]: But now I want to register a one-shot for two events, of which only one will arrive, so my data structure doesn't work anymore...
[Lady_Aleena]: Corion, ouchy.
[Corion]: (maybe I should write this up as a SoPW) - currently, the "most efficient" data structure I come up with is a single array which I scan for the first fitting one-shot. Not efficient but I don't expect more than five outstanding one-shots anyway
[choroba]: can't you create a meta-key corresponding to the disjunction of the events?
[robby_dobby]: Corion: Heh. This whole thing smells of Strategy Pattern or MVC pattern.
[Corion]: And performance linear to the number of registered one-shots doesn't feel that bad. Maybe I should collect statistics on how many callbacks are outstanding ;)
[Corion]: choroba: Yes, but the longer I thought about efficient hashes mapping the event type back to their callbacks, and how to keep them in sync, the more I thought that all that optimization might just not be worth it, even if it's horribly inelegant
[Lady_Aleena]: My biggest problem with hashes at the moment is one with 2,501 keys.
[choroba]: how many event types are there?
[Corion]: Also I found that I can't conveniently weaken an array slot, which also is inconvenient, as I want my one-shots to disappear if the caller discards them

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