nginx 线程是否会锁定直到查询完成？
我有一个有 4 个线程的 nginx。 nginx 位于 5 个杂种前面。有时，杂种运行的查询需要很长时间。如果 4 个这样的查询同时发生，是否意味着 nginx 的所有 4 个线程都很忙，并且会锁定进一步的请求，直到有一个线程空闲为止？
I have a nginx with 4 threads. The nginx is in front of 5 mongrels. Sometimes a query a mongrel is running takes very long. If 4 such queries occur simultaneously does that mean that all 4 threads of nginx are busy and will lock out further requests until a thread is free?
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据我所知，nginx 线程提供多个连接，通过系统调用（如“epol”和“kqueue”）对它们进行复用。因此，当它循环时，它有时会检查系统调用以从后端返回某些内容，但它肯定能够回复客户端。
As far as I know nginx threads serve multiple connections, multiplexing them by syscalls (like "epol" and "kqueue"). So, while it loops it would check syscalls to return something from backends sometimes, but it would certainly be able to reply to clients.