Hi,
Thanks about the info about ps.
This raises two new questions:
1) The following code is a very basic kernel module (based on my
previous code, removing somethings).
I do not understand something:
I call
/* sleep for a millisecond */
msleep(1);
printk("calling do_exit\n");
msleep(60000);
In my understanding, after 1 millisecond, it should have been
available to the scheduler, and after returning to the line after
msleep(1), it should print "calling do_exit". However,
I see no such log message. Any ideas why ? can something be
added to enable this ?
2)How can I create a kernel thread so that it will be in
TASK_INTERRUPTIBLE state ? there must be a way,
since I see many kernel threads where ps shows "S" in the
status coumn.
struct task_struct *task;
int thread_function(void *data)
{
int exit_sig = SIGKILL;
printk("in %s\n",__func__);
/* sleep for a millisecond */
msleep(1);
printk("calling do_exit\n");
msleep(60000);
do_exit(exit_sig);
return 0;
}
static int kernel_init(void)
{
printk("in kernel_init\n");
task = kthread_create(thread_function,NULL,"MY_KERNEL_THREAD");
return 0;
}
static void kernel_exit(void)
{
printk("in kernel_exit\n");
kthread_stop(task);
}
module_init(kernel_init);
module_exit(kernel_exit);
rgs
Kevin
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