http://d2100.com/questions/29022 作为依赖关系的另一个 NSOperation 添加时不调用 NSOperation dealloc 使用文书我看到很多我自定义的 NSOperation 永远不会被释放.我已经把一个断点放在 dealloc 方法中,它叫做永远不会. 我还注意到作为依赖关系的另一个 NSOperation 添加任何 NSOperation 时出现问题.如果我从我的代码中删除以下句子,称为 myOperation 的 dealloc 方法. [oth…

先给出NSOpetation的官方指导https://developer.apple.com/library/ios/documentation/Cocoa/Reference/NSOperation_class/ NSOperation The NSOperation class is an abstract class you use to encapsulate the code and data associated with a single task. Because it is a…

转:http://blog.csdn.net/andy_jiangbin/article/details/17114989 接着前面写. 本帖先讲AFURLConnectionOperation,它是AFNetworking中是所有请求网络的基类.它是基于NSURLConnection实现的,所以在此类里实现了NSURLConnection的delegate 方法: - `connection:didReceiveResponse:` - `connection:didReceiveData:`…

原文地址:http://www.codeproject.com/Tips/1023621/SQL-Performance-Improvement-Techniques This article provides various options to improve the performance in database. 1) Re-Write Query: If any query is taking much time to execute then the first step is to…

Pausing for a Period of TimeProblem:You need to (asynchronously) wait for a period of time. This can be useful when unittesting or implementing retry delays. This solution can also be useful for simple time‐outs.Solution:The Task type has a static me…

使用任务简化异步编程 Igor Ostrovsky 下载代码示例 异步编程是实现与程序其余部分并发运行的较大开销操作的一组技术. 常出现异步编程的一个领域是有图形化 UI 的程序环境:当开销较大的操作完成时,冻结 UI 通常是不可接受的. 此外,异步操作对于需要并发处理多个客户端请求的服务器应用程序来说非常重要. 在实践过程中出现的异步操作的典型例子包括向服务器发送请求并等待响应.从硬盘读取数据以及运行拼写检查等开销较大的计算. 以一个含 UI 的应用程序为例. 该应用程序可以使用 Window…

      这是只一个简单的例子,当然还有更复杂的规则说明,可以参考一下列表里的规则. 最后说下 process monitor 到底有什么用? 除了那些电脑高手喜欢分析程序运行情况外, 还有那些编程人员对程序运行情况的分析, 及查找电脑内是否有 木马的情况等. 第二部分:一个使用实例 ( 微软 Process Monitor 证实“窥私门”事件 ) 近期, 360 隐私保护器曝出腾讯 “ 窥私门 ” 事件.无数网民发现, QQ 聊天工具在暗中密集扫描电脑硬盘.窥视 用户的隐私文件, 另两款聊天…

An improved memory model and implementation is disclosed. The memory model includes a Total Store Ordering (TSO) and Partial Store Ordering (PSO) memory model to provide a partial order for the memory operations which are issued by multiple processor…

  Preface       In my previous blogs,I've demonstrated several mothods of how to rescue a dropped table(or truncated table as well).     full mysqldump backup + binlog on master(master was normally running)     full Xtrabackup backup + binlog on mast…

The NSOperationQueue class regulates the execution of a set of NSOperation objects. After being added to a queue, an operation remains in that queue until it is explicitly canceled or finishes executing its task. Operations within the queue (but not…