
Untitled Flashcards
Flashcard
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Information Technology (IT)
•
Professional Development
•
Practice Problem
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Hard
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6 questions
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1.
FLASHCARD QUESTION
Front
OS là gì?
Back
Là phần mềm trung gian giữa người dùng và phần cứng, quản lý tài nguyên hệ thống.
2.
FLASHCARD QUESTION
Front
User Mode vs Kernel Mode:
Back
User Mode: hạn chế quyền truy cập phần cứng.
Kernel Mode: toàn quyền truy cập tài nguyên hệ thống.
3.
FLASHCARD QUESTION
Front
System call
Back
Cơ chế gọi dịch vụ của OS fork(), read(), write().
4.
FLASHCARD QUESTION
Front
What is an Operating System (OS)?
Back
An operating system is a system program that acts as an intermediary between the user and the computer hardware.
It manages hardware resources such as CPU, memory, and I/O devices, and provides an interface so application programs can operate efficiently and safely.
5.
FLASHCARD QUESTION
Front
User Mode vs. Kernel Mode
Back
User Mode: Limited access to hardware; cannot directly interact with critical system memory or devices.
Kernel Mode: Full access to all system resources; only OS code runs in this mode.
6.
FLASHCARD QUESTION
Front
What is a System Call?
Back
A system call is a mechanism that allows a user program to request services from the operating system.
Examples: fork(), read(), write(), open(), exec(), exit().
Process:
User calls → Trap (software interrupt) → Kernel handles the request → Control returns to user mode.
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