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
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