操作系统概念(英文)——3-13.ppt

Operating System Concepts- Chapter3 Processes - * Method1 programming the IP address and port number into client process. demerits Method2 dynamic binding by using matchmaker in server Name of Called procedure, e.g. X in Fig.3.12 matchmaker Port number of Called procedure, e.g. P in Fig.3.12 Appendix 3.B RPC过程(续) Operating System Concepts- Chapter3 Processes - * 2012年研究生入学考试计算机统考大纲要求 二 进程管理 （一）进程与线程 1. 进程概念 (§3.1) 2. 进程的状态与转换 (§3.1.2, Fig.3.2) 3. 进程控制(§3.2, §3.3) 4. 进程组织(§3.1.3, Fig.3.1) 5. 进程通信(§3.4) 共享存储系统；消息传递系统；管道通信 6. 线程概念与多线程模型(Chapter 5) * Operating System Concepts- Chapter3 Processes - * Indirect Communication (cont.) Procedure of communication between P and Q P, or Q, or other process creates a new mailbox A P and Q communicate via send(mail_A, message) and receive(mail_A, message) when communication is completed, mailbox A is destroyed Operating System Concepts- Chapter3 Processes - * Properties of communication links the link is established only if processes share a common mailbox a link may be associated with many processes, i.e., a mailbox is not specific to a particular pair of processes. each pair of processes may share several communication links. links may be unidirectional or bi-directional. Mailbox 2 P1 P3 Mailbox 1 P2 Indirect Communication (cont.) Operating System Concepts- Chapter3 Processes - * Mailbox sharing problem and its solutions (*知道*） Problem P1, P2, and P3 share mailbox A, when P1, sends, for P2 and P3, who will gets the message? Mailbox A P1 P2 P3 Indirect Communication (cont.) Operating System Concepts- Chapter3 Processes - * depends on the following strategies one link is permitted to be associated with at most two processes only one process at a time is permitted to to execute a receive operation system can select arbitrarily the receiver, but the sender must notified who is the receiver . Indirect Communication (cont.) Operating System Concepts- Chapter3 Processes - * 3.4.2.2 Synchroniza