18 Questions
What is the main difference between user-level threads (ULTs) and kernel-level threads (KLTs) in Linux?
ULTs are implemented entirely in user space, while KLTs are managed by the kernel.
How does the Linux kernel handle scheduling for ULTs?
The kernel maps multiple ULTs to a single kernel-level process and schedules them together.
What is the primary advantage of using ULTs over KLTs in terms of performance?
ULTs have lower context switching overhead since they do not involve the kernel.
According to Amdahl's Law, what is the primary factor that limits the performance gains from multithreading?
The portion of the program that cannot be parallelized.
In the context of Android applications, what is the role of a Service component?
It performs long-running operations in the background.
Which POSIX thread function is used to create a new thread in a C program?
pthread_create()
What is a key difference between User-Level Threads (ULTs) and Kernel-Level Threads (KLTs)?
ULTs are managed by the operating system, while KLTs are managed by the user.
In the context of threads, what does it mean when it is mentioned that 'Threads reside in the same address space and have access to the same data'?
Threads share memory space and can communicate by reading and writing to the same data locations.
What happens when one thread alters an item of data in memory, according to the text?
Other threads see the results when they next access that item.
How does suspension of a process impact its threads?
Threads are terminated along with the suspension of the process.
In the context of processes and threads, what does 'Amdahl's Law' primarily address?
It emphasizes the limitations of parallelization in improving overall system performance.
What role does a Thread Control Block (TCB) play in managing threads within a process?
It maintains register values, priority, and state information for each thread.
What is a key advantage of User-Level Threads (ULTs) over Kernel-Level Threads (KLTs)?
ULTs allow thread management code to be embedded in the program.
When will a thread execute on the processor according to the text?
Only when the process is in Running state
In the context of ULTs and process states, what happens when a process exhausts its time slice?
The process moves to Ready state and Kernel switches to another process.
Which type of thread management requires all work to be done by the kernel?
Kernel-Level Threads (KLTs)
Considering Thread 2's status, what does it mean for Thread 2 to be perceived as Running but it is not?
Thread 2 is ready to run but waiting for resources.
What is a distinguishing characteristic of ULTs compared to KLTs regarding thread switching?
ULTs save overhead by avoiding user-kernel mode switches during thread switching.
This quiz covers the concept of threads in operating systems, specifically how threads of a process share resources and data. It also explains how alterations made by one thread can be visible to other threads, and the implications of file access privileges. Test your knowledge on thread usage in operating systems with this quiz.
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