I've checked the wrong source version, mdelay() is implemented as:
n = (loops_per_jiffy * HZ * usecs) / MILLION;
for(i=0;i<n;i++)
__asm__ __volatile__("rep;nop": : :"memory");
Similar as it is in x86. But in UML it doesn't work for me.
David Ramirez wrote:
> Hi all,
>
> Recently, I decided to use UML to develope my modules. My module calls
> mdelay() macro that is implemented in UML as:
>
> n = (loops_per_jiffy * HZ * usecs) / MILLION;
> for(i=0;i<n;i++)
> do ; while(0);
>
>
> mdelay() worked perfectly in x86 but in UML it doesnt seem to sleep.
>
> I've checked loop values:
>
> loops_per_jiffy: 27918336
> HZ: 100
> MILLION: 1000000
>
> My system is:
> linux 2.6.32-r5
> gcc version 4.3.4 (Debian 4.3.4-2)
>
> Can it be a compiler optimization?
>
> Thanks in advance,
> David
>
>
>
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