- 1、本文档共68页,可阅读全部内容。
- 2、有哪些信誉好的足球投注网站(book118)网站文档一经付费(服务费),不意味着购买了该文档的版权,仅供个人/单位学习、研究之用,不得用于商业用途,未经授权,严禁复制、发行、汇编、翻译或者网络传播等,侵权必究。
- 3、本站所有内容均由合作方或网友上传,本站不对文档的完整性、权威性及其观点立场正确性做任何保证或承诺!文档内容仅供研究参考,付费前请自行鉴别。如您付费,意味着您自己接受本站规则且自行承担风险,本站不退款、不进行额外附加服务;查看《如何避免下载的几个坑》。如果您已付费下载过本站文档,您可以点击 这里二次下载。
- 4、如文档侵犯商业秘密、侵犯著作权、侵犯人身权等,请点击“版权申诉”(推荐),也可以打举报电话:400-050-0827(电话支持时间:9:00-18:30)。
查看更多
[其它]lecture05
THREAD
漏 2010, Yongguang Zhang 157
The Notion of Concurrency
鈥 鈥淭hread鈥 of execution
鈥 Sequential execution of a stream of instructions at a CPU
鈥 Uniprogramming: one thread at a time
鈥 Early OS (MSDOS, etc.)
鈥 Multiprogramming: multiple threads at a time
鈥 Modern OS
鈥 Sometimes called 鈥渕ultitasking鈥
鈥 The basic problem of concurrency: multiplexing
鈥 Hardware: limited set of resources (CPU, memory, I/O)
鈥 Multiprogramming: each thread thinks it owns the whole thing
鈥 OS has to manage concurrency
漏 2010, Yongguang Zhang 158
Managing Space
鈥 OS abstractions: Address Space
0 232
P1
0 232
P2
0 232
P3
0 232
Kernel
isolation
OS Memory Management Subsystem
sharing
Operating System 0 m Mm
Cache MMU
Hardware
漏 2010, Yongguang Zhang 159
Managing Time
鈥 OS abstraction: Process, Thread
system call (user I/O) interrupt (timer)
P1
waiting ready
文档评论(0)