Lecture_5-CSCIU511-Jahangir_Majumder-Spring_2025

What is the purpose of the fork() system call in UNIX?

The fork() system call creates a copy of the current process and starts it running.

What does the exec() system call do in UNIX?

The exec() system call changes the program being run by the current process.

What can be a possible consequence of using User-Level Threads (ULTs)?

When a ULT executes a blocking system call, all threads within its process are blocked.

What is multithreading?

Multithreading is the ability of an operating system to support multiple, concurrent paths of execution within a single process.

Why is concurrency important in operating systems?

Concurrency allows operating systems to handle multiple tasks simultaneously, improving efficiency and performance.

What is a key disadvantage of Kernel-Level Threads (KLTs)?

The transfer of control from one thread to another within the same process requires a mode switch to the kernel.

What are the three possible execution views for threads according to the programmer's perspective?

A thread may be suspended, other threads may run, and then the thread is resumed.

How many child processes are created from the code 'fork() fork() fork()'?

7 child processes will be created.

What differentiates User-Level Threads (ULTs) from Kernel-Level Threads (KLTs)?

ULTs are managed entirely by the user application, while KLTs are managed by the kernel.

What are the key states for a thread?

The key states for a thread are Running, Ready, and Blocked.