<Concurrency>:http://docs.oracle.com/javase/tutorial/essential/concurrency/index.html <Java并发结构>:http://ifeve.com/java-concurrency-constructs/ <Java并发性和多线程介绍>:http://ifeve.com/java-concurrency-thread-directory/ <Java并发编程从入门到精通>:htt…

前段时间在公司给大家分享GO语言的一些特性,然后讲到了并发概念,大家表示很迷茫,然后分享过程中我拿来了Rob Pike大神的Slides <Concurrency is not Parallelism>,反而搞的大家更迷茫了,看来大家丢了很多以前的基本知识.后来我就把Pike大神的slide和网上的一些牛人关于Cocurrency和Parallelism的观点做了整理,最终写了本文. 在Rob Pike的<Concurrency is not Parallelism>(http:/…

The hardware we rely on is changing rapidly as ever-faster chips are replaced by ever-increasing numbers of cores. As a result, concurrency and parallelism, niche features today, will soon be a basic requirement for most software. Application develop…

原创地址:http://www.cnblogs.com/jfzhu/p/4009918.html 转载请注明出处   (一)为什么需要并发控制机制 并发控制机制是为了防止多个用户同时更改同一条数据,也可以防止一个用户在更改数据的同时造成另一个用户看到"过期"的数据.下面看一个例子就明白了. John和Marry有一个联合银行帐户,帐户的余额是$1000,John向帐户里存入了$500,Marry取走了$500,如果没有并发控制,John最后看到的余额是$1500,而Marry看到的帐户…

http://getakka.net/docs/concepts/terminology Terminology and Concepts In this chapter we attempt to establish a common terminology to define a solid ground for communicating about concurrent, distributed systems which Akka.NET targets. Please note th…

Motivation 承并发编程笔记Outline,这篇文章专注于记录学习基于锁的并发概念的过程中出现的一些知识点,为并发高层抽象做必要的准备. 尽管存在Doug Lee开山之作Concurrent Programming in Java, 2th edition: Desing Principles and Patterns.Brian Goetz撰写的一些列文章(http://www.ibm.com/developerworks/cn/java/j-jtp/ ).以及随后出现的一系列有关Ja…

Concurrency Visualizer: https://msdn.microsoft.com/en-us/library/dd537632.aspx?f=255&MSPPError=-2147217396 利用 Visual Studio 2010 中的 Concurrency Visualizer 优化性能: https://msdn.microsoft.com/zh-cn/magazine/ee336027.aspx Parallel.For翻船事件剖析-使用Concurrency…

1.数据并发控制(Data Concurrency Control)简介 数据并发控制(Data Concurrency Control)是用来处理在同一时刻对被持久化的业务对象进行多次修改的系统.当多个用户修改业务对象的状态并试图并发地将其持久化到数据库时,需要一种机制来确保一个用户不会对另一个并发用户的事务状态造成负面影响. 有两种形式的并发控制:乐观和悲观.乐观并发控制假设当多个用户对业务对象的状态同时进行修改时不会造成任何问题,也称为最晚修改生效(last change wins).对于…

大家好,欢迎回到性能调优培训.今天标志着第5个月培训的开始,这个月我们会谈论SQL Server里的锁.阻塞和死锁(Locking, Blocking, and Deadlocking). SQL Server提供悲观和乐观并发控制模式,它们用来定义并发查询的执行.这期我会给你讲解悲观并发控制模式里各种隔离级别概况,下周我会进一步介绍自SQL Server 2005起引入的乐观隔离级别情况. 悲观隔离级别(Pessimistic Isolation Levels) 悲观隔离级别意味着读查询(SE…

大家好,欢迎回到性能调优培训.上个星期我通过讨论悲观并发模式拉开了第5个月培训的序幕.今天我们继续,讨论下乐观并发模式(Optimistic Concurrency). 行版本(Row Versioning) 乐观并发模式自SQL Server 2005后引入,并基于行版本控制(Row Versioning)原则.行版本控制背后的想法是读操作(SELECT查询)不再需要获得共享锁(Shared Lock).不去等待直到成功获得共享锁(Shared Lock),读操作是返回行前一个提交的版本.老的…

先看一个例子 #include <ppltasks.h> #include <iostream> using namespace Concurrency; using namespace std; int main() { task<int> t([]() { return 10; }); t.wait(); wcout << t.get() << endl; return 0; } 输出 10          先解释下这段程序做了什么,tas…

在日常的Java代码开发过程中,很难免地有对多线程的需求,掌握java多线程和并发的机制也是Java程序员写出更健壮和高效代码的基础.笔者找寻国内已出版的关于Java多线程和并发的的中文书籍和翻译书籍,大家一致推荐的是<Java Concurrency in Practice>,笔者暂时还没有看英文原版,笔者看的是它的翻译版<Java并发编程实战>,笔者读起来感觉并不通畅,不知道是翻译的问题还是原版本来就写得不够流畅,同时感觉知识的深度也超过了入门的需求. 笔者在机缘巧合之下,发现…

Principle Use the higher-level concurrency utilities instead of wait and notify for easiness. Use ConcurrentHashMap in preference to Collections.synchronizedMap or Hashtable. Use concurrent collections in preference to externally synchronized collect…

1.1. A (Very) Brief History of Concurrency motivating factors for multiple programs to execute simultaneously: Resource utilization. Programs sometimes have to wait for external operations such as input or output, and while waiting can do no useful w…

粗略看完<Java Concurrency in Practice>这部书,确实是多线程/并发编程的一本好书.里面对各种并发的技术解释得比较透彻,虽然是面向Java的,但很多概念在其他语言的并发编程中,也可以用到.因此,开始写下其读书笔记,归纳总结. 闲话少说,从第十章开始,先上思维导图: 本章的重点,是死锁以及死锁的分析和避免方法. 10.1.1 锁的顺序产生死锁: public class WorkerThread implements Runnable{ private LeftRigh…

Computer Systems A Programmer's Perspective Second Edition The general phenomenon of multiple flows executing concurrently is known as concurrency . The notion of a process taking turns with other processes is also known as multitasking . Each time p…

Difference between Processes and Threads Processes A process has a self-contained execution environment. A process generally has a complete, private set of basic run-time resources; in particular, each process has its own memory space.Processes are o…

Hive Concurrency Model Hive Concurrency Model Use Cases Turn Off Concurrency Debugging Configuration Locking in Hive Transactions Use Cases Concurrency support (http://issues.apache.org/jira/browse/HIVE-1293) is a must in databases and their use case…

计算机用户想当然地认为他们的系统在一个时间可以做多件事.他们认为,他们可以工作在一个字处理器,而其他应用程序在下载文件,管理打印队列和音频流.即使是单一的应用程序通常也是被期望在一个时间来做多件事.例如,音频流应用程序必须同时读取数字音频,解压,管理播放,并更新显示.即使字处理器应该随时准备响应键盘和鼠标事件,不管多么繁忙,它总是能格式化文本或更新显示.可以做这样的事情的软件称为并发软件(concurrent software). 在 Java 平台是完全支持并发编程.自从 5.0 版本以来,这…

摘自: www.uml-diagrams.org Here we provide several UML class diagrams for the Java™ 7 java.util.concurrent package. Several java.util.concurrent.* packages introduced with version 5.0 of the Java platform added high-level concurrency features to the Ja…

The Java concurrency API provides a class that allows one or more threads to wait until a set of operations are made. It's the CountDownLatch class. This class is initialized with an integer number, which is the number of operations the threads are g…

The Java concurrency API provides a synchronizing utility that allows the synchronization of two or more threads in a determined point. It's the CyclicBarrier class. This class is similar to the CountDownLatch class, but presents some differences tha…

One of the most complex and powerful functionalities offered by the Java concurrency API is the ability to execute concurrent-phased tasks using the Phaser class. This mechanism is useful when we have some concurrent tasks divided into steps. The Pha…

The Phaser class provides a method that is executed each time the phaser changes the phase. It's the onAdvance() method. It receives two parameters: the number of the current phase and the number of registered participants; it returns a Boolean value…

Usually, when you develop a simple, concurrent-programming application in Java, you create some Runnable objects and then create the corresponding Thread objects to execute them. If you have to develop a program that runs a lot of concurrent tasks, t…

One of the advantages of the Executor framework is that you can run concurrent tasks that return a result. The Java Concurrency API achieves this with the following two interfaces: Callable: This interface is similar to the Runnable interface. It has…

The next section covers Go's concurrency primitives. A Tour of Go Goroutines A goroutine is a lightweight thread managed by the Go runtime. go f(x, y, z) starts a new goroutine running f(x, y, z) The evaluation of f, x, y, and z happens in the curren…

http://www.codeproject.com/Articles/89858/WCF-Concurrency-Single-Multiple-and-Reentrant-and Introduction and goalIn this article, we will concentrate on WCF concurrency and throttling. We will first try to understand what is WCF concurrency and the t…

14.6.6 Configuring Thread Concurrency for InnoDB 配置线程并发 InnoDB 使用操作系统线程来处理请求(用户事务) 事务可能执行很多次在它们提交或者回滚前. 在现在的操作系统,具有多核CPU 上下文切换是有效的, 很多的负载运行很好没有任何并发线程数量的限制 在这种情况下 它是用助于最小化上下文切换在线程之间, InnoDB 使用一些技术来限制并发执行操作系统线程的数量(也就是说请求的数量任何一个时间的处理数量) 当InnoDB 从用户会话接收一…

转: http://www.blogjava.net/xylz/archive/2010/07/03/325168.html 在这个小结里面重点讨论原子操作的原理和设计思想. 由于在下一个章节中会谈到锁机制,因此此小节中会适当引入锁的概念. 在Java Concurrency in Practice中是这样定义线程安全的: 当多个线程访问一个类时,如果不用考虑这些线程在运行时环境下的调度和交替运行,并且不需要额外的同步及在调用方代码不必做其他的协调,这个类的行为仍然是正确的,那么这个类就是线程安…