Listing 5: Getting an interrupt vector
// thread used as deferred procedure call created in init_module
void *pp_thread_ep(void* arg)
{
while (1)
{
pthread_wait_np(); // wait to be woken up...
// process interrupt now in realtime kernel context
...
}
}
// interrupt handler
unsigned int irq_handler(unsigned int irq, struct pt_regs *regs)
{
pthread_wakeup_np(pp_thread); // wake up thread to do IRQ post-processing
rtl_hard_enable_irq(IRQ_LINE); // re-enable IRQ
return 0;
}
int init_module(void)
{
// create thread pp_thread to wake up by interrupt handler
...
rtl_request_irq(IRQ_LINE, irq_handler); // request...
rtl_hard_enable_irq(IRQ_LINE); // ...and enable interrupt handler
}
void cleanup_module(void)
{
rtl_free_irq(IRQ_LINE);
// do the rest of clean=up sequence
}
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