User level thread is the higher level user scheduling unit supported by kernel thread, it supports concurrent execution of user programs.
用户级线程是在核心线程的支持下建立的更高层次的用户调度单位，能较好地支持用户程序的并发执行。
In order to implement this algorithm, this paper designed a user-level thread scheduling application framework.
为了实现这一算法，本文设计了一种用户级的应用线程调度框架。
Whenever a user-level thread makes a blocking system call, the kernel execution vehicle it is using will become blocked in the kernel.
当用户空间线程调用了一个阻塞的系统调用时，内核执行对象也会在内核阻塞。
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