(1) User-level threads are unknown by the kernel, whereas the kernel is aware of kernel threads.
(2) On systems using either M:1 or M:N mapping, user threads are scheduled by the thread library and the kernel schedules kernel threads.
(3) Kernel threads need not be associated with a process where as every user thread belongs to a process. Kernel threads are generally more expensive to maintain than user threads as they must be represented with a kernel data structure.
(2) On systems using either M:1 or M:N mapping, user threads are scheduled by the thread library and the kernel schedules kernel threads.
(3) Kernel threads need not be associated with a process where as every user thread belongs to a process. Kernel threads are generally more expensive to maintain than user threads as they must be represented with a kernel data structure.
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