remote job entry terminal, and the SNA/SDLC stack was a direct evolution from
执行到 sleep 时，线程会进入阻塞状态，操作系统把它挂起，不分配 CPU 时间片。但这个线程仍然被占用着，线程池里它的“坑位”一直没释放。如果同时有 200 个请求进来，线程池的 200 个线程全被占满，都在等 IO，第 201 个请求就得排队，哪怕 CPU 空闲 99%。
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昨晚，苹果 CEO Tim Cook 在社交媒体官宣：
“It was very degrading and humiliating. I felt like I was being violated and exploited. I felt quite disgusting, but I felt I had no choice,” Sara, who did not want to use her full name, told Guardian Australia.