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From: Niklas Holsti <niklas.holsti@tidorum.invalid>
Newsgroups: comp.lang.ada
Subject: Re: Ada.Execution_Time
Date: Sat, 01 Jan 2011 21:18:45 +0200
Organization: Tidorum Ltd
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Date: 2011-01-01T21:18:45+02:00
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Simon Wright wrote:
> Simon Wright <simon@pushface.org> writes:
> 
>> Niklas Holsti <niklas.holsti@tidorum.invalid> writes:
>>
>>> The question is then if the compiler/system vendors will take the
>>> trouble and cost to customise Ada.Execution_Time for a particular
>>> board/computer, or if they will just use the general,
>>> lowest-denominator but portable service provided by the kernel. Dmitry
>>> indicates that GNAT on VxWorks takes the latter, easy way out.
>> The latest supported GNAT on VxWorks (5.5) actually doesn't implement
>> Ada.Execution_Time at all (well, the source of the package spec is
>> there, adorned with "pragma Unimplemented_Unit", just like the FSF
>> 4.5.0 sources and the GNAT GPL sources -- unless you're running on
>> Cygwin or MaRTE).
> 
> Actually, Dmitry's complaint was that time (either from
> Ada.Calendar.Clock, or Ada.Real_Time.Clock, I forget) wasn't as precise
> as it can easily be on modern hardware, being incremented at each timer
> interrupt; so if your timer ticks every millisecond, that's your
> granularity.

Thanks for correcting me, Simon, I mis-remembered or misunderstood Dmitry.

-- 
Niklas Holsti
Tidorum Ltd
niklas holsti tidorum fi
       .      @       .