Subsecond sleep

[Jed Brown]

Barry Smith wrote:
> 
>   It is fine with me to switch the infrastructure to use a PetscReal
> instead of integer

Done.

http://petsc.cs.iit.edu/petsc/petsc-dev/rev/5704078f5057


Did PetscSleep() once return the time remaining instead of an error
code?  The following can't possibly have worked correctly for a while.
Should it be fixed or removed?

    /*
        IBM sleep may return at anytime, hence must see if there is more time to sleep
    */
    {
      int left = sleeptime;
      while (left > 0) {left = PetscSleep(left) - 1;}
    }



Jed

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