Which of the following is FALSE?
Options
O
User level threads do not need any hardware support
c) Related kernel level threads can be scheduled on different processors in a multiprocessor system
d) Blocking one kernel level thread blocks all other related threads
Context switch time is longer for kernel level threads than for user level threads
Clear Response
Answers
Answer:
D is the correct answer
Explanation:
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Answer: correct option is D which is Blocking one kernel-level thread blocks all other related threads
Explanation:
A kernel thread is a schedulable entity, which means that the system scheduler handles kernel threads.
Known to the system planner, these threads are highly implementation-dependent. To make writing portable programs easier, libraries provide user threads.
A kernel thread is a kernel entity such as processes and interrupts handlers; it is an entity that is processed by the system scheduler. A kernel thread runs within a process but can be referenced by any other thread on the system. For more information on kernel programming, see Kernel Extensions and Device Support Programming Concepts.
A user thread is an entity used by programmers to handle multiple streams of control within a program. The API for handling user threads is provided by the thread library. A user thread exists only within a process; a user thread in process A cannot reference a user thread in process B. The library uses a proprietary kernel threading interface to run user threads. The user thread API, unlike the kernel thread interface, is part of the POSIX-compliant portable programming model. Thus, a multi-threaded program developed on AIX can be easily ported to other systems.
On other systems, user threads are simply called threads, and the simplified process refers to kernel threads.
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