| User level thread | Kernel level thread |
|---|---|
| User thread are implemented by users. | kernel threads are implemented by OS. |
| OS doesn’t recognized user level threads. | Kernel threads are recognized by OS. |
| Implementation of User threads is easy. | Implementation of Kernel thread is complicated. |
| Context switch time is less. | Context switch time is more. |
| Context switch requires no hardware support. | Hardware support is needed. |
| If one user level thread perform blocking operation then entire process will be blocked. | If one kernel thread perform blocking operation then another thread can continue execution. | Example : Java thread, POSIX threads. | Example : Window Solaris. |
Below is the Previous Year Gate Question
http://quiz.geeksforgeeks.org/gate-gate-cs-2007-question-17/
References:
http://www.cs.iit.edu/~cs561/cs450/ChilkuriDineshThreads/dinesh%27s%20files/User%20and%20Kernel%20Level%20Threads.html
Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above
Recommended Posts:
- Operating System | Threads and its types
- Operating System | Microkernel
- Operating System | Process-based and Thread-based Multitasking
- Zombie Processes and their Prevention
- Virtual Memory | Operating System
- Last Minute Notes – Operating Systems
- What exactly Spooling is all about?
- Operating System | Paging
- Multi threading models
- Operating System | Thread
- Operating System | Memory Management |Partition Allocation Method
- Operating System | Process Management | Deadlock Introduction
- Operating System | Process Synchronization | Introduction
- Operating System | Process Management | Introduction
- Mutex vs Semaphore