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Difference between User Level thread and Kernel Level thread

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  • Difficulty Level : Easy
  • Last Updated : 22 Jun, 2022
User level thread Kernel level thread
User threads are implemented by users. kernel threads are implemented by OS.
OS doesn’t recognize 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 performs blocking operation then entire process will be blocked. If one kernel thread perform blocking operation then another thread can continue execution.
Multithread applications cannot take advantage of multiprocessing. Kernels can be multithreaded.
User level threads are designed as dependent threads. Kernel level threads are designed as independent threads.
Example: Java thread, POSIX threads. Example: Window Solaris.

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