Re: kerel level threads

[Glynn Clements <glynn@gclements.plus.com>]

K. Anantha Kiran wrote:

>     Point me to appropiate group if this question doesnt fit here.
>     Does pthread_create() create kernel level threads?
>     I have created two threads A and B. Thread A was written to print 
> some statement in an infinite loop, while Thread B was written to be 
> blocked for some time(I have used sleep system call to block Thread B). 
> If at all pthread_create() creates user level threads, Blocking of 
> Thread B will also make Thread A to be blocked.  But  in my output, 
> Thread A was continously printing even when Thread B was blocked.  My 
> observation is that either both of the threads be Kernel level threads 
> or pthread library has given wrapper functions for blocking calls(for 
> example, sleep system call in our case) which stop all of the threads to 
> be blocked.  I read in text books that pthread libray is for creating 
> user level threads(threads about which kernel is not aware of).

libpthread creates kernel threads.

-- 
Glynn Clements <glynn@gclements.plus.com>