Select all of the following statements that are true about user-level and kernel-level threads– incorrect selections carry negative marks.

Question

Accepted Answer

User-level threads can be implemented in an OS that does not support threads.

Accepted Answer

With user-level threads in one-to-many mapping, the OS scheduler does not have total control over scheduling decisions for threads within a process.

Answer

OSs have always supported multiple threads.

Answer

In an OS that maps each user-level thread to a kernel-level thread, if one thread of a process blocks for I/O then the entire process will block waiting for that I/O to complete.

Answer

OSs that run on uniprocessors can not support kernel level threads.

Answer

In a kernel‑level threading model using the 1:1 mapping, it is likely that a process with more runnable threads can receive more total CPU time than a process with fewer runnable threads.

Crowdly

Select all of the following statements that are true about user-level and kernel...

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