Interrupts Hardware Software.

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Presentation transcript:

Interrupts Hardware Software

Interrupt definition Dictionary definition: stop the continuous progress of (an activity or process). Hardware interrupts are used by devices to communicate that they require attention from the operating system A software interrupt is caused either by an exceptional condition in the processor itself, or a special instruction in the instruction set which causes an interrupt when it is executed.

Simple processor design review

New Register Interrupt Register (IR) A hardware register (bits) that contains a value at all times. Silly example of a nibble IR and possible problems 0000 – No problem 0001 – Printer is out of paper 0010 – Processor is overheating 0011 – Disk drive is disconnected 0100 – Internet connection is lost

Interrupt Register (IR)

Hardware Interrupt Handler locator

Software Interrupts

What is an Exception? An exception is an event, which occurs during the execution of a program, that disrupts (interrupts) the normal flow of the program's instructions. Exceptions are a software version of interrupts

Example (file not found) void readFile() { openFile = open(“input.txt”); strings[] s = readFrom(openFile); doStuff(s); close(openFile); } Should work fine, however, what if the file input.txt is not there one day when you are running this program?

3 kinds of exceptions 1) Checked exceptions. User can anticipate Ex) file not found. 2) Error exceptions. Error that are external to the applications like hardware exceptions. 3) Runtime exception. Logic error in code and improper used of API, etc.

Class definitions for exception objects Consider the following : The Mathematical exception library might be organized like this. class Matherr { virtual void debug_print( ) const { cerr << “Math error”;} } ; class Overflow : public Matherr { } ; class Underflow : public Matherr { } ; class Zerodevide: public Matherr { } ; class overflow : public Matherr const char* op; int a1, a2: public: void int_overflow(const char* p, int a, int b) { op = p;a1= x; a2 = y;} virtual void debug_print( ) const { cerr << op << ‘(‘ << a1 << ‘,’ << a2 << ‘)’; }

Catching exceptions void f( ) { try { // some math code goes here } catch (Overflow) { // code to handle an over flow catch(Matherr) { // Handle any Matherr that is not an overflow catch(Dividezero) { // Handle any Divide by zero catch(…) { // Handle any exception not listed above Comments: the Dividezero will never run because Dividezero is a Matherr catch(…) will catch any exception object