Re: [WIKI] Re: race condition

[Tyler <tyler@xxxxxxxx>]

Here is a programm to show a simple (the simplest ?) race condition.

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/types.h>

MODULE_AUTHOR("tyler@xxxxxxxx");
MODULE_DESCRIPTION("Race condition");
MODULE_LICENSE("GPL");

static int value = 10;

static int thread_function(void *data)
{
	char msg[50];

	sprintf(msg, "%d + 5 = ", value);
	value += 5;

	schedule();

	printk(KERN_ERR "%s%d\n", msg, value);

	return 0;
}

static int __init init_module_race(void)
{
	pid_t th1, th2;

	th1 = kernel_thread(thread_function, NULL, 0);
	th2 = kernel_thread(thread_function, NULL, 0);

	return 0;
}

static void __exit exit_module_race(void)
{
	return;	
}

module_init(init_module_race);
module_exit(exit_module_race);

	

	
		
___________________________________________________________________________ 
Appel audio GRATUIT partout dans le monde avec le nouveau Yahoo! Messenger 
Téléchargez cette version sur http://fr.messenger.yahoo.com


--
Kernelnewbies: Help each other learn about the Linux kernel.
Archive:       http://mail.nl.linux.org/kernelnewbies/
FAQ:           http://kernelnewbies.org/faq/