南京大学：《面向对象技术 OOT》课程教学资源（PPT课件讲稿）06 并发对象 Concurrent Objects

Concurrent Objects 并发对象 Institute of Computer Software 2022-2-27 Nanjing University

并发对象 Concurrent Objects 2022-2-27 Institute of Computer Software Nanjing University 1

&雪扇 摘要 UNIVE 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 Semaphores and reader/writer in Java Institute of Computer Software 2022-2-27 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 2022-2-27 Institute of Computer Software Nanjing University 2

&雪扇 摘要 UNIVE 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 Semaphores and reader/writer in Java Institute of Computer Software 2022-2-27 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 2022-2-27 Institute of Computer Software Nanjing University 3

&雪扇 并发基础知识 4 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 2022-2-27 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” 2022-2-27 Institute of Computer Software Nanjing University 4

&雪扇 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 2022-2-27 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” 2022-2-27 Institute of Computer Software Nanjing University 5

What is "Concurrency"? 6 Edsger Wybe Dijkstra "Concurrency occurs when two or more executior are able to run simultaneously." Roscoe,A.W.The Theory and Practice of Conc 1997 "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 2022-2-27 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.” 2022-2-27 Institute of Computer Software Nanjing University 6

Concurrent Computing 102 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. Institute of Computer Software 2022-2-27 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. 2022-2-27 Institute of Computer Software Nanjing University 7

Concurrent Computing 102 8 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 Institute of Computer Software 2022-2-27 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 2022-2-27 Institute of Computer Software Nanjing University 8

&雪扇 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 2022-2-27 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” 2022-2-27 Institute of Computer Software Nanjing University 9

&扇 Concurrent Programming 10 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 2022-2-27 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 2022-2-27 Institute of Computer Software Nanjing University 10