From mboxrd@z Thu Jan 1 00:00:00 1970 From: Glynn Clements Subject: Re: kerel level threads Date: Wed, 25 May 2005 12:46:50 +0100 Message-ID: <17044.26026.165790.767334@gargle.gargle.HOWL> References: <20050524034750.70100.qmail@web51307.mail.yahoo.com> <42942467.9060805@cse.iitk.ac.in> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <42942467.9060805@cse.iitk.ac.in> Sender: linux-c-programming-owner@vger.kernel.org List-Id: Content-Type: text/plain; charset="us-ascii" To: "K. Anantha Kiran" Cc: linux-c-programming@vger.kernel.org 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