[gambit-list] Problem in thread-sleep! may be a poor implementation of the select system call
vasil.s.d at gmail.com
Wed Jan 28 14:03:30 EST 2009
After update scheme code displays n from 9040 to 9192.
> On 28-Jan-09, at 2:13 AM, vasil wrote:
>> I consider linux RT kernel is somewhat unusual.
>> Here is result of select-test.c on my Linux machine:
>> $ time ./a.out
>> real 0m10.015s
>> user 0m0.000s
>> sys 0m0.002s
>> $ uname -a
>> Linux cassiopea 2.6.22-16-rt #1 SMP PREEMPT RT Mon Nov 24 19:03:10 GMT
>> 2008 x86_64 GNU/Linux
>> Linux distro is Ubuntu 7.10 with RT linux kernel on laptop with Core 2
>> Duo in AMD64 mode.
>> When I run scheme code, I've got a value of n 1001 or 1002.
> Please try it again, this time after a "make update".
> I have changed the implementation of the "select" logic so that if
> "select" is being called purely to sleep (i.e. there is no I/O to wait
> for), then the "nanosleep" function will be called. I would appear that
> nanosleep has a much better resolution. I also fixed a bug which gave a
> segfault when thread-sleep! was interrupted.
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