Re: [gentoo-user] Is my system (really) using nptl

[Canek Peláez Valdés]

On Sat, Oct 13, 2012 at 12:10 PM, Mark Knecht <markknecht@×××××.com> wrote:
> On Sat, Oct 13, 2012 at 9:15 AM, Canek Peláez Valdés <caneko@×××××.com> wrote:
> <SNIP>
>>
>> We can only know seeing the code. Timur, this is the little test I
>> made which creates 5 threads and runs them for 1 minute. In my case,
>> `ps x` shows only 1 PID, care to give it a try?
>>
>> ----------------------
>> #include <pthread.h> <<======
>> #include <unistd.h>
>> #include <stdlib.h>
>> #include <stdio.h>
>
> Thanks for the test case. Like you I see only one thread. However the
> test case wouldn't compile for me without the -pthread option so it
> makes me wonder what happens to a program like I had pointed to
> yesterday that uses the old style threading that did create lots of
> process ids? Possibly an nptl system would still generate lots of ids
> for that program and that's what he's seeing?
>
> Just curious. I don't program but I'm always sort of interested.

You got your answer. NTPL stands for Native POSIX Thread *Library*. As
it name says, it is a library (with support in the kernel and in
glibc). If you don't use the library (-lpthread), you cannot make use
of its advantages.

What "old style threading" did you use for your test case?

Regards.
-- 
Canek Peláez Valdés
Posgrado en Ciencia e Ingeniería de la Computación
Universidad Nacional Autónoma de México