如何避免Deadlock,如果我们能提前知道各个Process对于资源的需求情况,我们就可以用Banker's algorithm (银行家算法) 来解决问题.可是这在现在中不好实现,因为很难提前知道对于资源的需求情况.此时可以用一下两种方法来解决问题. 1. Wait - die Protocol 2. Kill - wait Protocol 具体地,根据两个Process的创建时间,创建时间较早的,我们称之为Older Process (O),较晚的那个称之为Yonger Process…

[故障处理]ORA-28040: No matching authentication protocol 1.1  BLOG文档结构图 1.2  前言部分 1.2.1  导读和注意事项 各位技术爱好者,看完本文后,你可以掌握如下的技能,也可以学到一些其它你所不知道的知识,~O(∩_∩)O~: ① 告警日志中频繁出现Using deprecated SQLNET.ALLOWED_LOGON_VERSION parameter.ORA-28040: No matching authenticatio…

In computer science, Deadlock is a naughty boy aroused by compete for resources. Even now,     there isn't a valid method to deal with it. This is amazing. You know, we have many excellent     scientists,  not all of issues can fight with us so many…

A novel massively parallel supercomputer of hundreds of teraOPS-scale includes node architectures based upon System-On-a-Chip technology, i.e., each processing node comprises a single Application Specific Integrated Circuit (ASIC). Within each ASIC n…

/** * Declares queue, creates if needed * * @param string $queue * @param bool $passive * @param bool $durable * @param bool $exclusive * @param bool $auto_delete * @param bool $nowait * @param null $arguments * @param null $ticket * @return mixed|nu…

An apparatus and method is described herein for providing robust speculative code section abort control mechanisms. Hardware is able to track speculative code region abort events, conditions, and/or scenarios, such as an explicit abort instruction, a…

A processor employing a post-cache (LS2) buffer. Loads are stored into the LS2buffer after probing the data cache. The load/store unit snoops the loads in the LS2 buffer against snoop requests received from an external bus. If a snoop invalidate requ…

BACKGROUND OF THE INVENTION The use of a cache memory with a processor facilitates the reduction of memory access time. The fundamental idea of cache organization is that by keeping the most frequently accessed instructions and data in the fast cache…

DEADLOCKS Both processes are blocked and will remain so forever. This situation is called a deadlock. 6.1 RESOURCES 6.1.1 Preemptable and Nonpreemptable Resources Resources come in two types: preemptable and nonpreemptable. A preempt-able resource is…

操作系统 清华大学ucore操作系统课笔记 全文思维导图 1. 操作系统概述 1.1 什么是操作系统? 操作系统的定义 没有公认的精确定义 一个控制程序 一个系统软件 控制程序执行过程,防止错误和计算机的不当使用 执行用户程序,给用户程序提供各种服务 方便用户使用计算机系统 一个资源管理器 应用程序和硬件之间的中间层 管理各种计算机软硬件资源 提供访问计算机软件硬件资源的高效手段 解决资源访问冲突,保证资源公平使用 操作系统的地位 操作系统软件的组成 shell--命令行接口 GUI--图像用户…