使用Racket编写TCP服务器和客户端

本示例展示了如何使用Racket编写一个TCP服务器和客户端，实现简单的聊天室功能。

#lang racket

(require tcp)

(define PORT 8080)
(define MAX-CONNECTIONS 50)
(define (restart-server server-socket handler)
  (let listen-loop()
    (let-values ([(in out) (tcp-accept server-socket)])
      (thread (λ() (handler in out)))
      (listen-loop))))
(define (handle-message in out)
  (define message (read-line in))
  (printf "received: ~a\n" message)
  (write-line out message)
  (flush-output out)
  (handle-message in out))
(define server-socket (tcp-listen PORT MAX-CONNECTIONS))
(restart-server server-socket handle-message)

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