步骤四：系统调用返回，导致了第4次上下文切换。
Step four: the write system call returns, creating our fourth context switch.
可能有几种上下文切换，你真的不控制。
There might be several context switches, you don't really control this.
这任务叫做上下文切换。
在软件开发这样的复杂任务环境中上下文切换也是个问题。
Context switching in a complex task environment like software development is a major problem.
send系统调用返回，结果导致了第四次的上下文切换。
The send system call returns, creating the fourth context switch.
send系统调用返回，结果导致了第四次的上下文切换。
The send system call returns, creating the fourth context switch.
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