Does swoole not have multi-threading?

Since the PHP language does not support multi-threading, Swoole uses multi-process mode. There is process memory isolation in multi-process mode. When global variables and super-global variables are modified in the working process, it will be invalid in other processes.

Reactor thread

The main process of Swoole\Server is a multi-threaded program. There is a very important group of threads called Reactor threads. It is the thread that actually handles TCP connections and sends and receives data.

After accepting a new connection, Swoole's main thread will assign the connection to a fixed Reactor thread, and this thread will be responsible for monitoring the socket. Read the data when the socket is readable, perform protocol analysis, and deliver the request to the Worker process. Send data to the TCP client when the socket is writable.

The allocation calculation method is fd % serv->reactor_num

Recommended learning: swoole video tutorial

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