AW: [uClinux-dev] usleep takes longer as expected

[Phil Wilshire]

Hi Siegfried

We get confused easily in the USA
For example

   10.000 sometimes means 10 (as a float)

   10,000 or 10000 normally means 10 times 1000

Anyway you can get your 1mS (1000usec) delay
if you add 15% to your cpuload by executing the timer tick 1000 time 
every  1 Second.

(Thanks Harry for the measurement)

   Phil Wilshire



Siegfried Müller wrote:

> Hi Chris,
> 
> usleep(100) means 100usec, usleep(10000) means 10.000usec or 10ms.
> Cheers
> Siegfried
> -----Ursprüngliche Nachricht-----
> Von: uclinux-dev-bounces at uclinux.org
> [mailto:uclinux-dev-bounces at uclinux.org] Im Auftrag von Chris Doré
> Gesendet: Montag, 4. Februar 2008 17:10
> An: 'uClinux development list'
> Betreff: RE: [uClinux-dev] usleep takes longer as expected
> 
> 
> Do you mean 10msec?  Your subject asks about usleep() taking more time
> than expected, but then your reported results show that it takes less
> time than expected.
> 
> 
> ..Chris
> 
>> -----Original Message-----
>> From: uclinux-dev-bounces at uclinux.org [mailto:uclinux-dev- 
>> bounces at uclinux.org] On Behalf Of Siegfried Müller
>> Sent: February 4, 2008 10:57 AM
>> To: 'uClinux development list'
>> Subject: [uClinux-dev] usleep takes longer as expected
>>
>> Hi,
>> I work with the snapgear distro 3.4 and uClibc.
>> I use usleep to wait for an exact time, but usleep takes a minimum of 
>> 10.000usec. If i use usleep(100) it takes 10.000usec. Why?
>>
>> int main(int argc, char *argv[])
>>   int i1=0;
>>   struct timeval mytime;
>>   struct timezone mytimezone;
>>
>>   while(i1 < 10){
>>     gettimeofday(&mytime,&mytimezone);
>>     printf("Test %d, usec=%d,
>> sec=%d\n",i1,mytime.tv_usec,mytime.tv_sec);
>>     usleep(100);
>>     i1++;
>>   }
>> }
>> Does anyone has an idea?
>> Cheers
>> Siegfried
>>
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