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Nginx采用了事件驱动的、异步的单进程模型。它的底层结构由多个模块组成,包括事件模块、HTTP模块、反向代理模块等。 核心组件是事件模块,它利用操作系统提供的异步I/O机制(如epoll、kqueue)来实现高效的事件处理。Nginx的主进程是一个事件驱动的Reactor,通过事件循环(Event Loop)监听和接受客户端连接。当有新的连接到达时,主进程会将连接分发给一个可用的工作进程。 工作进程(Worker Process)是Nginx实际处理请求的执行者。每个工作进程都是独立的,并且在多个连接间共享相同的事件循环。工作进程通过事件驱动的方式处理请求,包括读取请求、解析请求头、处理请求逻辑、生成响应等。在处理请求的过程中,Nginx使用非阻塞I/O操作,充分利用异步I/O机制来提高并发处理能力。 |
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