Current Thread mapping

[Mulyadi Santosa]

Hi Santosh :)

On Sun, Jan 15, 2012 at 16:32, SaNtosh kuLkarni
<santosh.yesoptus at gmail.com> wrote:
> HI everyone just wanted to know whats the current implementation of user||
> kernel space thread mapping ...is it 1:1 or does it depend on the needs ?
> For example say if i have 12k user space thread running ,,,how many kernel
> space thread would be managing them... as far as i know there is 1:1 mappin

For NPTL based threading (Native Posix Threading Library), glibc and
linux kernel together maintain 1:1 mapping, that is one user mode
thread represented handled by one kernel mode thread.

Before NPTL, IIRC it's M:1, that is more than one user mode threads
are represented by one kernel mode thread. In user space, there's
somekind of "coordinator" or "master" that does cooperative switching
between threads. In NPTL, all threads are under the management of
Linux process scheduler directly.

-- 
regards,

Mulyadi Santosa
Freelance Linux trainer and consultant

blog: the-hydra.blogspot.com
training: mulyaditraining.blogspot.com