thank you.
i did like that.
here wht is the use of schedule() in this case?
Any way after the certain time thread2 is executed.
On Wed, 2005-09-21 at 18:40 +0500, Fawad Lateef wrote:
> On 9/21/05, Fawad Lateef <fawadlateef@xxxxxxxxx> wrote:
> > On 9/21/05, raja <vnagaraju@xxxxxxxxxxxx> wrote:
> > > Hi,
> > > I am trying to trace the race condition by creating 2 threads in
> > > kernel space. One thread incriments a global value and other
> > > decrements that value.
> > > But I am unable to trace the race condition.
> > > I am listing my code.Will you please help me.
> > >
> > >
> > > static int __init init_module_atomic(void);
> > > static void __exit exit_module_atomic(void);
> > >
> >
> > No need for the above declaration ..........
> >
> > > int value=0;
> >
> > Can change this to unsigned long value .........
> >
> > >
> > > int thread_function_1(void * data)
> > > {
> > > printk("Entered into Thread 1\n");
> > > int i;
> > > for(i=0;i<1000;i++)
> > > {
> >
> > Can change this loop to for( ; ; ) to get the result more properly
> >
> > > udelay(1000);
> >
> > Change this to schedule();
> >
> > > value++;
> > > printk("Value Is : %d\t",value);
> > > }
> > > printk("Exited From Thread 1\n");
> > > return 0;
> > > }
> > >
> > > int thread_function_2(void * data)
> > > {
> > > printk("Entered into Thread 2\n");
> > > int i;
> > > for(i=0;i<1000;i++)
> > > {
> >
> > Change to for ( ; ; )
> >
> > > udelay(100);
> >
> > change to schedule()
> >
> > > value--;
> > > printk("Value Is : %d\t",value);
> > > }
> > > printk("Exited From Thread 2\n");
> > > return 0;
> > > }
> > >
> >
> > In your code you won't be able to see just as your thread_1 terminates
> > quickly before starting thread_2 and udelay is stalling the whole CPU
> > and won't allow CPU to do other stuffs, so changing it to schedule()
> > will give you better result ...........
> >
>
> And also do kill/send signals to your thread for killing ........ so
> that it wont result in seg-fault if you remove your module ........
> for the case mentioned above by me .....
>
>
> --
> Fawad Lateef
>
> --
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