Brendan O'Dea wrote:
> found 448965 5.8.8-9
> thanks
>
> On 06/11/2007, Matthijs Melchior <[EMAIL PROTECTED]> wrote:
>
>> Brendan O'Dea wrote:
>>
> [drivel about usleep]
>
> Oops, sorry...
>
>
>> Yes, indeed, there is no problem with usleep. The problem I noticed is
>> with ualarm:
>>
>> setitimer(ITIMER_REAL, {it_interval={0, 0}, it_value={0, 2000000}},
>> 0xbfe91468) = -1 EINVAL (Invalid argument)
>>
>
> OK. I've replicated this with 5.8.8-9 and see your problem.
>
> On what version did this work for you?
>
> I see that there is code in Time/HiRes.xs to emulate ualarm() using
> setitimer() which seems to correctly set the sec/usec components of
> the timeval (it_value/it_interval) arguments, but this is not being
> used with my current libc which has ualarm().
>
> It seems possible that the version which worked for you was built
> using this emiulated version. The current build is calling ualarm()
> directly.
>
> Note the manual page for ualarm() states that values >= 1000000 may
> cause EINVAL (as is occuring here).
>
> --bod
>
OK, I have done the test on an older installation where I had no problem
using ualarm with times of more than 1 second. There I see the following:
$ strace -e setitimer perl -MTime::HiRes=ualarm -e 'ualarm 2000000; sleep 4'
setitimer(ITIMER_REAL, {it_interval={0,0}, it_value={0, 2000000}},
{it_interval={0,0}, it_value={0,0}}) = 0
--- SIGALRM (Alarm clock) @ 0 (0) ---
$
Here the kernel does not issue EINVAL and apparently normalizes
the struct timeval before using it.
The relevant versions installed on that machine are:
Kernel: 2.6.15-1-686-smp #1 SMP Thu Jun 29 09:50:41 CEST 2006 i686 GNU/Linux
ii perl 5.8.8-7
ii lib6 2.3.6.ds1-11
ii libdb4.4 4.4.20-8
ii libgdbm3 1.8.3-2
ii perl-base 5.8.8-7
ii perl-modules 5.8.8-7
The manual page also states ualarm is obsolete since POSIX.1-2001.
I think the implementation using setitimer should be kept and used
whenever setitimer is available.
I am using ualarm to allow for fractional number of seconds for the alarm,
because the standard alarm only knows about whole seconds.
Thanks.
--
Regards,
---------------------------------------------------------------- -o)
Matthijs Melchior Maarssen /\\
[EMAIL PROTECTED] +31 346 570616 Netherlands _\_v
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