On Wed, 23 Mar 2005, sounak chakraborty wrote:
dear sir
i want to call my own function inside the kernel
after a fixed interval(i.e some kind of timer)
how to do that which function i have to use to
repeat the function
anather way is that making my own system call
which calls my function and
this sytem call is being access by a user program
which calls it after a fixed inter val of time
will this be correct
thanks
sounak
This kernel code should do just fine.
struct INFO {
struct timer_list timer; // For test timer
atomic_t running; // Timer is running
};
//-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
//
// This stops the timer. This must NOT be called with a spin-lock
// held.
//
static void stop_timer()
{
if(atomic_read(&info->running))
{
atomic_dec(&info->running);
if(info->timer.function)
del_timer(&info->timer);
}
}
//-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
//
// This starts the timer. This must NOT be called with a spin-lock
// held.
//
static void start_timer(void)
{
if(!atomic_read(&info->running))
{
atomic_inc(&info->running);
init_timer(&info->timer);
info->timer.expires = jiffies + HZ;
info->timer.data = 0;
info->timer.function = test_timer;
add_timer(&info->timer);
}
}
//-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
//
// This is the code that executes at a timer-interval.
//
static void test_timer(unsigned long data)
{
info->timer.expires = jiffies + HZ; // New expiration time
if(atomic_read(&info->running)) // If it's still running
{
code_to_execute_every_timer_interval();
add_timer(&info->timer); // Into timer-queue again
}
}
//-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Cheers,
Dick Johnson
Penguin : Linux version 2.6.11 on an i686 machine (5537.79 BogoMips).
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