Question: In the discussion of User-Level-Thread (UTL)s versus Kernel-Level-Thread (KTL)s, it says that a disadvantage of UTLs is the when a a UTL executes a system

In the discussion of User-Level-Thread (UTL)s versus Kernel-Level-Thread (KTL)s, it says that a disadvantage of UTLs is the when a a UTL executes a system call, not only is that thread blocked, but also all of the threads within the process are blocked. Why is that so?

This is the operating system concepts problem, can someone help me?

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