On Wed, Jun 30, 2004 at 14:55:43 +0530, Anupam Kapoor wrote: > also, kernel threads have their mm pointer set to NULL. That's part of what daemonize() does. If you didn't call daemonize(), it wouldn't have, but it's mandatory to call it. > kernel threads are schedulable, They would be useless otherwise. > preemptible etc. No, they are not! Just like any other process running in kernel space, they are only preemptable if it's kernel version 2.6 (or 2.4 with preempt patches), the preemption is actualy turned on with CONFIG_PREEMPT and they don't hold any spinlocks. So a kernel thread should better sleep explicitely from time to time. > just like normal processes. They ARE normal processes, actualy. They just run in kernel space all the time. ------------------------------------------------------------------------------- Jan 'Bulb' Hudec <bulb@ucw.cz>
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