0xAX/linux-insides

SYSCALL - multitasking & Interruput event

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#493 opened on Jul 16, 2017

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Description

Dear OxAX , Thanks for your efforts for writing "Linux Inside" . It has cleared most of my doubts. I request you to please elaborate few technical doubts about System call .

  1. System call in multitasking environment : a. What will happen if higher priority task need system resources by SYSCALL but already lower priority task's SYSCALL in running ( kernel code is executing ) ?

b. During one system call multitasking / multi threading is still possible or only one thread will have access to SYSCALL ?

  1. System call during External / Peripheral interrupt : a. what will happen if external interrupt or higher priority pheripheral interrupt triggers while processing SYSCALL ?

Request you to please reply on this & if possible please add explanation in "Linux Inside"

Regards, Gaurav

Contributor guide

Research direction
Study the Linux kernel's system call entry and exit paths, specifically focusing on how the scheduler handles preemption during system calls and how interrupt handlers interact with system call execution. Key areas: entry 64.S, syscall init, preempt count, and interrupt handler top halves.
Tech stack
c
Domain
operating systems
Issue type
Research
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
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Half day
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Needs maintainer response
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Clear
Prerequisites
C programmingLinux kernel basics
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40