http://stackoverflow.com/questions/28715625/is-it-safe-to-use-field-inside-and-outside-synchronized-block Is it safe to use field inside and outside synchronized block? 问题: Background Our app sends emails which are queued in a database table. We've h…

Java 同步块(synchronized block)用来标记方法或者代码块是同步的.Java同步块用来避免竞争.本文介绍以下内容: Java同步关键字(synchronzied) 实例方法同步 静态方法同步 实例方法中同步块 静态方法中同步块 Java同步示例 Java 同步关键字(synchronized) Java中的同步块用synchronized标记.同步块在Java中是同步在某个对象上.所有同步在一个对象上的同步块在同时只能被一个线程进入并执行操作.所有其他等待进入该同步块的线程将…

What is a memory model, anyway? In multiprocessorsystems, processors generally have one or more layers of memory cache, whichimproves performance both by speeding access to data (because the data iscloser to the processor) and reducing traffic on the…

为何使用它? 示例 下载 手册 支持 论坛 推荐 秀出你的站点 http://phpv.net/TBS_Manual.htm#html_automatic 网站: http://www.tinybutstrong.com/index.php?lang=fr 作者: skrol29@freesurf.fr, Pirjo Date: -- *.^.*.^.*.^.*.^.*.^.*.^.*.^.*.^.*.^.*.^.*.^.*.^.*.^.*.^.* TinyButStrong version 2…

From http://tutorials.jenkov.com/java-concurrency/synchronized.html By Jakob Jenkov   A Java synchronized block marks a method or a block of code as synchronized. Java synchronized blocks can be used to avoid race conditions. The Java synchronized Ke…

对于使用java同学,synchronized是再熟悉不过了.synchronized是实现线程同步的基本手段,然而底层实现还是通过锁机制来保证,对于被synchronized修饰的区域每次只有一个线程可以访问,从而满足线程安全的目的.那么今天就让我们聊一聊synchronized的那些事 1.基本用法 java内存模型(JMM)围绕原子性,可见性.有序性以及Happen-before原则展开(参考http://www.cnblogs.com/hujunzheng/p/5118256.html)…

However, because the reference is weak, the object that self points to could be deallocated while theblock is executing.You can eliminate this risk by creating a strong local reference to self inside the block: __weak BNREmployee *weakSelf = self; //…

摘自:http://topmanopensource.iteye.com/blog/1738178 进行多线程编程,同步控制是非常重要的,而同步控制就涉及到了锁. 对代码进行同步控制我们可以选择同步方法,也可以选择同步块,这两种方式各有优缺点,至于具体选择什么方式,就见仁见智了,同步块不仅可以更加精确的控制对象锁,也就是控制锁的作用域,何谓锁的作用域?锁的作用域就是从锁被获取到其被释放的时间.而且可以选择要获取哪个对象的对象锁.但是如果在使用同步块机制时,如果使用过多的锁也会容易引起死锁问题,同…

It's possible to synchronize both an entire method and a section of code within a method, and you may wonder which one you should use. To understand which is appropriate in a given situation, it’s important to consider what synchronization really pro…

"Cricket Field" Time Limit: 1 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/gym/100002 Description Once upon a time there was a greedy King who ordered his chief Architect to build a field for royal cricket inside his park. The King was so…