Table of Contents
What is the difference between an interrupt and a system call?
The main difference between System Call and Interrupt is that System Call is a method that allows a program to request services from the kernel while Interrupt is an event that indicates the CPU to perform a specific task immediately. The operating system works as the interface between the user and the hardware.
What are subroutine calls?
A set of Instructions which are used repeatedly in a program can be referred to as Subroutine. When a Subroutine is required it can be called many times during the Execution of a Particular program. A call Subroutine Instruction calls the Subroutine.
What is an interrupt subroutine?
A program to stop immediately, whenever the interrupt is activated, even if the program is in the middle of scanning a net in another subroutine. A jump to the Interrupt subroutine. An Interrupt subroutine must have the exact name shown in the examples below.
Can a system call be interrupted?
1 Answer. System calls can be interrupted by any signal, this includes such signals as SIGINT (generated by CTRL-C), SIGHUP, etc.
What is calling sequence?
A calling sequence is the conventional sequence of instructions that call and return from a procedure. Because programs tend to make many procedure calls, a compiler should ensure that this sequence is as economical as possible. and existing conventions of the target machine.
What is difference between function and subroutine?
A function commonly carries out some calculations and reports the result to the caller. Subroutines perform a task but do not report anything to the calling program. A function cannot change the value of the actual arguments . A subroutine can change the value of the actual argument.
How is an interrupt triggered by software?
Software interrupts may also be unexpectedly triggered by program execution errors. These interrupts typically are called traps or exceptions. For example, a divide-by-zero exception will be “thrown” (a software interrupt is requested) if the processor executes a divide instruction with divisor equal to zero.
How does invoking a system call cause a trap?
After checking for a system call, trap looks for hardware interrupts (which we dis- cuss below). In addition to the expected hardware devices, a trap can be caused by a spurious interrupt, an unwanted hardware interrupt.