INTERVIEW QUESTIONS OPERATING SYSTEMS LINUX DETAILS

Question: What is UserLabel Thread?

Answer: User-level avoids the kernel and manages the tables itself. Often this is called "cooperative multitasking" where the task defines a set of routines that get "switched to" by manipulating the stack pointer. Typically each thread "gives-up" the CPU by calling an explicit switch, sending a signal or doing an operation that involves the switcher. Also, a timer signal can force switches. User threads typically can switch faster than kernel threads

User-level avoids the kernel and manages the tables itself. Often this is called "cooperative multitasking" where the task defines a set of routines that get "switched to" by manipulating the stack pointer. Typically each thread "gives-up" the CPU by calling an explicit switch, sending a signal or doing an operation that involves the switcher. Also, a timer signal can force switches. User threads typically can switch faster than kernel threads Source: CoolInterview.com

These are invisible to the Operating System. These are created by the System Level Library(in Unix it is POSIX library).

consider p1 got time slice of 100 ms.
5 threads of that process will share the time slice 100 ms.
T1-20
T2-30
T3-10
T4-35
T5-5

Which thread has to share how much time slice will be decided by the developer at the time of developing the software (or that program).

For suppose if 1 thread goes to waiting state then entire process will be swithched to waiting state(all the threads of that process). Source: CoolInterview.com

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