Prefork 多进程模型

转：

Prefork 就是预先创建好制定数量的进程来接受请求

t json
import struct
import socket


def handle_conn(conn, addr, handlers):
    print addr, "comes"
    while True:
        length_prefix = conn.recv(4)
        if not length_prefix:
            print addr, "bye"
            conn.close()
            break  # 关闭连接，继续处理下一个连接
        length, = struct.unpack("I", length_prefix)
        body = conn.recv(length)
        request = json.loads(body)
        in_ = request['in']
        params = request['params']
        print in_, params
        handler = handlers[in_]
        handler(conn, params)


def loop(sock, handlers):
    while True:
        conn, addr = sock.accept()
        handle_conn(conn, addr, handlers)


def ping(conn, params):
    send_result(conn, "pong", params)


def send_result(conn, out, result):
    response = json.dumps({"out": out, "result": result})
    length_prefix = struct.pack("I", len(response))
    conn.send(length_prefix)
    conn.sendall(response)


def prefork(n):
    for i in range(n):
        pid = os.fork()
        if pid < 0:  # fo...

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