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Re: Poor granularity of usleep impl on Win32
From: |
Eric Blake |
Subject: |
Re: Poor granularity of usleep impl on Win32 |
Date: |
Wed, 23 Apr 2014 06:22:11 -0600 |
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Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.4.0 |
On 04/23/2014 04:26 AM, Daniel P. Berrange wrote:
> The gnulib usleep replacement says
>
> /* This file is _intentionally_ light-weight. Rather than using
> select or nanosleep, both of which drag in external libraries on
> some platforms, this merely rounds up to the nearest second if
> usleep() does not exist. If sub-second resolution is important,
> then use a more powerful interface to begin with. */
>
>
> The 'sleep' replacement on Win32 calls into the Win32-specific Sleep()
> function which allows milli-second granularity. Why doesn't usleep()
> call into Sleep() directly, so it gets milli-second granularity rather
> than rounding up to the nearest second ?
Good idea. I can work on that.
>
> In libvirt at least, we intentionally use usleep() over sleep() because
> we really do want sub-second granularity, which makes gnulib's usleep
> replacement rather unhelpful :-( I'd venture to suggest that the majority
> of apps using usleep only need milli-second granularity, so an impl that
> used Sleep() on Win32 would be pretty spot-on.
You've convinced me :)
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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