南京大学：《面向对象技术 OOT》课程教学资源（PPT课件讲稿）并发对象 Concurrent Objects

Concurrent Obiects 并发对象 Institute of Computer Software 2021/1/27 Nanjing University

并发对象 Concurrent Objects 2021/1/27 Institute of Computer Software Nanjing University 1

最病 过摘要 2 口并发基础知识 口并发与面向对象程序设计 口Java并发模型 n Semaphores and reader/writer in Java Institute of Computer Software 2021/1/27 Nanjing University

摘要  并发基础知识  并发与面向对象程序设计  Java并发模型  Semaphores and reader/writer in Java 2021/1/27 Institute of Computer Software Nanjing University 2

最病 过摘要 口并发基础知识 口并发与面向对象程序设计 口Java并发模型 n Semaphores and reader/writer in Java Institute of Computer Software 2021/1/27 Nanjing University

摘要  并发基础知识  并发与面向对象程序设计  Java并发模型  Semaphores and reader/writer in Java 2021/1/27 Institute of Computer Software Nanjing University 3

最病 过并发基础知识 口并发的概念 口并发程序设计 口“并发”和“面向对象” Institute of Computer Software 2021/1/27 Nanjing University

并发基础知识  并发的概念  并发程序设计  “并发”和“面向对象” 2021/1/27 Institute of Computer Software Nanjing University 4

最病 过并发基础知识 5 口并发的概念 口并发程序设计 口“并发”和“面向对象” Institute of Computer Software 2021/1/27 Nanjing University

并发基础知识  并发的概念  并发程序设计  “并发”和“面向对象” 2021/1/27 Institute of Computer Software Nanjing University 5

最病 What is“ Concurrency"? 6 a Edsger Wybe Dijkstra Concurrency occurs when two or more execution are able to run simultaneously. n Roscoe, A w. the Theory and Practice of concu 7997 n Concurrency is a property of systems in which several computational processes are executing at the same time and potentially interacting with each other. Institute of Computer Software 2021/1/27 Nanjing University

What is “Concurrency”?  Edsger Wybe Dijkstra  "Concurrency occurs when two or more execution flows are able to run simultaneously."  Roscoe, A. W. The Theory and Practice of Concurrency, 1997  “Concurrency is a property of systems in which several computational processes are executing at the same time, and potentially interacting with each other.” 2021/1/27 Institute of Computer Software Nanjing University 6

最病 A Concurrent Computing 7 n Concurrent(simultaneous) execution of multiple interacting computational tasks n These tasks may be implemented as separate programs, or as a set of processes or threads created by a single program a Ihe tasks may also be executing on a single processor, several processors in close proximity, or distributed across a network Institute of Computer Software 2021/1/27 Nanjing University

Concurrent Computing  Concurrent (simultaneous) execution of multiple interacting computational tasks.  These tasks may be implemented as separate programs, or as a set of processes or threads created by a single program.  The tasks may also be executing on a single processor, several processors in close proximity, or distributed across a network. 2021/1/27 Institute of Computer Software Nanjing University 7

最病 A Concurrent Computing 8 a Concurrent computing is related to parallel computing but focuses more on the interactions between tasks 口 key concerns: 1 a Correct sequencing of the interactions or communications between different tasks a The coordination of access to resources that are shared between tasks Institute of Computer Software 2021/1/27 Nanjing University

Concurrent Computing  Concurrent computing is related to parallel computing, but focuses more on the interactions between tasks.  Key concerns:  Correct sequencing of the interactions or communications between different tasks  The coordination of access to resources that are shared between tasks 2021/1/27 Institute of Computer Software Nanjing University 8

最病 过并发基础知识 9 口并发的概念 口并发程序设计 口“并发”和“面向对象” Institute of Computer Software 2021/1/27 Nanjing University

并发基础知识  并发的概念  并发程序设计  “并发”和“面向对象” 2021/1/27 Institute of Computer Software Nanjing University 9

Weil Concurrent Programming 口多道程序设计( Multiprogramming) 口系统同时接纳多个程序进入内存,让它们在OS控 制下交迭或夹插执行的方式 ■存储浮动和程序保护 ■处理器管理和调度 ■系统资源的管理 Institute of Computer Software 2021/1/27 Nanjing University

Concurrent Programming  多道程序设计(Multiprogramming)  系统同时接纳多个程序进入内存，让它们在OS控 制下交迭或夹插执行的方式 ◼ 存储浮动和程序保护 ◼ 处理器管理和调度 ◼ 系统资源的管理 2021/1/27 Institute of Computer Software Nanjing University 10