"It's a very empathetic place," she says of Reddit. "For my wedding, I've found help emotionally, logistically and inspiration-wise."
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%。，更多细节参见同城约会
h->ref = 0;。关于这个话题，快连下载-Letsvpn下载提供了深入分析
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