interrupt-handling

Our group is using a custom driver to interface four MAX3107 UARTs on a shared I2C bus. The interrupts of the four MAX3107's are connected (i.e. shared interrupt via logic or'ing)) to a GPIO pin on the ARM9 processor (LPC3180 module). When one or more of these devices interrupt, they pull the GPIO line, which is configured as a level-sensitive interrupt, low. My question concerns the need, or not, to disable the specific interrupt line in the handler code. (I should add that we are running Linux 2.6.10). Based on my reading of several ARM-specific app notes on interrupts, it seems that when

I would like to know if it is possible to automatically invoke a Java method when a hardware interrupt is raised. There may be an alternative. I'm doing something similar: In an application I monitor 4 mice for clicks. Those clicks generate interrupts but I'm happy enough not to deal with them directly from Java. Under Linux, it turns out there are device files ( /dev/input/mouse# ) that spew a bunch of characters when something happens with the mouse. I have a Thread for each one with a FileReader blocking on a read. Once characters arrive, the appertaining thread unblocks and I can do

I want to interrupt a thread, but invoking interrupt() doesn't seem to work. Below is the sample code: public class BasicThreadrRunner { public static void main(String[] args) { Thread t1 = new Thread(new Basic(), "thread1"); t1.start(); Thread t3 = new Thread(new Basic(), "thread3"); Thread t4 = new Thread(new Basic(), "thread4"); t3.start(); t1.interrupt(); t4.start(); } } class Basic implements Runnable{ public void run(){ while(true) { System.out.println(Thread.currentThread().getName()); try { Thread.sleep(1000); } catch (InterruptedException e) { System.err.println("thread: " + Thread

"Software interrupts are delivered using signals" Is this always true, if not then a) what is the difference between two If yes, is there some other mechanism, by which software interrupts are raised, other than delivering signals. The author of that quote appears to be using "Software interrupt" in a very general sense (i.e. "anything that causes a program to diverge from it's usual flow of operation and does not originate in hardware" ) and "signals" in the sense of a particular mechanism used by a particular operating system (probably unix derived). Yes its always true that software

I could not find a proper answer for the following questions even in some well written kernel books: They are saying that an ISR can't sleep because its not possible to reschedule an ISR as it is not connected with any process , so what happens when a higher priority interrupt preempt the executing one? the interrupted ISR will not rescheduled(execute) again ? if yes how & who will do that work? many time we will disable interrupt (eg: 1.In critical region 2. When a fast interrupt is executing it will disable all the interrupt in the current processor) , so what will happen for the interrupts

I have a ruby script below which infinitely prints numbers from 1 onward. How can I make the script stop its infinite execution through an interrupt in the terminal like 'Ctrl+C' or key 'q'? a = 0 while( a ) puts a a += 1 # the code should quit if an interrupt of a character is given end Through every iteration, no user input should be asked. I think you will have to check the exit condition in a separate thread: # check for exit condition Thread.new do loop do exit if gets.chomp == 'q' end end a = 0 loop do a += 1 puts a sleep 1 end BTW, you will have to enter q<Enter> to exit, as that's how