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Operating System Chapter 4: Threads

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Questions and Answers

What is the primary difference between user threads and kernel threads?

User threads are supported by the kernel, while kernel threads are managed by user-level threads library
User threads are used for application programming, while kernel threads are used for system calls
User threads are used for system calls, while kernel threads are used for application programming
User threads are managed by user-level threads library, while kernel threads are supported by the kernel (correct)

Which of the following is an example of a many-to-one model?

Solaris Green Threads (correct)
Windows
Linux
Mac OS X

What is the main advantage of the one-to-one model?

No concurrency
More threads per process
More concurrency than many-to-one (correct)
Fewer threads per process

What is the primary characteristic of the many-to-many model?

Allows many user-level threads to be mapped to many kernel threads (B) Signup and view all the answers

Which of the following is an example of a thread library?

Pthreads (B) Signup and view all the answers

What is the primary difference between a thread library and a kernel-level library?

Thread library is implemented in user space, while kernel-level library is implemented in kernel space (A) Signup and view all the answers

What is the purpose of implicit threading?

To create and manage threads by compilers and run-time libraries rather than programmers (D) Signup and view all the answers

What is the advantage of thread pools?

It usually takes less time to service a request with an existing thread than create a new thread (C) Signup and view all the answers

What is the purpose of OpenMP?

To provide support for parallel programming in shared-memory environments (B) Signup and view all the answers

What is the main difference between Java threads and threads in other operating systems?

Java threads are managed by the JVM, while threads in other operating systems are managed by the OS (B) Signup and view all the answers