Motivation o On modern desktop PC,many APPs are multithreaded. a seperate process with several threads Example 1:A web browser one for displaying images or text; another for retrieving data from network Example 2:A word processor one for displaying graphics; another for responding to keystrokes from the user; and a third for performing spelling grammer checking in the background Example 3:RPC servers for each message,a separate thread is used to service the message concurrency 口⊙生年12月0C 陈话兰xlanchen@ustc.edu.cn http/staff.u0117401 Operating System操作系统原理斐 March29,20197/44. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Motivation On modern desktop PC, many APPs are multithreaded. ▶ a seperate process with several threads ▶ Example 1: A web browser ⋆ one for displaying images or text; ⋆ another for retrieving data from network ▶ Example 2: A word processor ⋆ one for displaying graphics; ⋆ another for responding to keystrokes from the user; ⋆ and a third for performing spelling & grammer checking in the background ▶ Example 3: RPC servers ⋆ for each message, a separate thread is used to service the message ⋆ concurrency↑ 陈香兰 xlanchen@ustc.edu.cn http://staff.ustc.edu.cn/~xlanchen (Computer Application Laboratory, CS, USTC @ Hefei Embedded System Laboratory, CS, USTC @ Suzhou) 0117401: Operating System 操作系统原理与设计 March 29, 2019 7 / 44