dispatch_once单例初始化
static GHCache *instance = nil;/*** 单例,静态初始化方法** @return 返回一个单例*/+ (GHCache*)shareCache{static dispatch_once_t onceToken;dispatch_once(&onceToke
GCD中的dispatch_set_target_queue的用法及作用
(一),使用dispatch_set_target_queue更改Dispatch Queue的执行优先级dispatch_queue_create函数生成的DisPatch Queue不管是Serial DisPatch Queue还是Concurrent Dispatch Queue,执行的优先...
Swift 4/5 实现GCD的dispatch_after
Swift 4实现延时的简单方法:DispatchQueue.main.asyncAfter(deadline: .now() + .milliseconds(100)) { // Code}Swift 5实现延时的简单方法:DispatchQueue.main.asyncAfter(deadl
Grand Central Dispatch(GCD)
GCD GCD是异步执行任务的技术之一。GCD使用很简洁的记述方法,实现了极为复杂繁琐的多线程编程。dispatch_async(queue, ^{ //长时间处理 //例如AR用动画识别 //例如数据库访问 //长时间处理结束,主线程使用该处理结果 ...
设置(dispatch_get_main_queue()、^ {…});等到做了什么?
I have a scenario in my app, where I want to do some time consuming task which consists of some data processing as well as UI update, in a method. My ...
performSelectorOnMainThread和主队列上的dispatch_async有什么区别?
I was having problems modifying a view inside a thread. I tried to add a subview but it took around 6 or more seconds to display. I finally got it wor...
为什么主队列上的GCD dispatch_async会导致后台队列的死锁?
I am creating a serial background queue like this: 我正在创建一个串行背景队列,如下所示: @property (nonatomic, strong) dispatch_queue_t assetCreationQueue;// in init......
杀死iOS中dispatch_async队列中的项目
I am running a bunch of items in the background using dispatch_async and sometimes I want to kill what I have in the queue - is this possible? For ins...
dispatch_async块未被调用
MySynchManager class is having a shared instance. MySynchManager类有一个共享实例。 One of the function in MySynchManager class is MySynchManager类中的一个功能是 - (voi...
使用NSURLConnection和dispatch_async时,不会释放内存
In the interest of knowing how stuff works I have written a simple iPhone application that has a start button. Pressing that button triggers an action...
dispatch_async并调用原始队列上的完成处理程序
I've seen some related questions but none seem to answer this case. I want to write a method that will do some work in the background. I need this met...
我在q1上调度dispatch_async,调用主队列上的UI对象,在q1上添加回调,崩溃
It sounds confusing but it looks like this 这看起来很混乱,但看起来像这样 AVPlayer *capturedPlayer = _player;dispatch_async(_subtitlesQueue, ^{ // Parse the requ...
Linux中的Swift:使用未解析的标识符'dispatch_async'
I compiled libdispatch. This code is working: 我编译了libdispatch。这段代码有效: import Dispatchvar lockQueue = dispatch_queue_create("com.test.async", nil); But...
在Grand Central Dispatch中使用dispatch_sync
Can anyone explain with really clear use cases what the purpose of dispatch_sync in GCD is for? I can't understand where and why I would have to use t...
GCD信号量—dispatch_semaphore详解与使用
一 什么是信号量? dispatch_semaphore信号量是一种基于计数器的一种多线程同步机制。 简单来说就是控制访问资源的数量,比如系统有两个资源可以被利用,同时有三个线程要访问,只能允许两个线程访问,第三个应当等待资源被释放后再访问。注意:再GCD中,只有调度的线程在信号量不足的时候才会...
使用Grand Central Dispatch进行文件监控
I'm using the code example by David Hamrick to monitor a file using GCD. 我正在使用David Hamrick的代码示例来使用GCD监视文件。 int fildes = open("/path/to/config.plist",...
IOS Grand Central Dispatch采用回调方式
I haven't used GCD or much threading in my apps but I've run into a situation where I need to run a method or two off another thread. Once this method...
GCD (Grand Central Dispatch) 笔记
GCD (Grand Central Dispatch) 是Apple公司开发的一种技术,它旨在优化多核环境中的并发操作并取代传统多线程的编程模式。 在Mac OS X 10.6和IOS 4.0之后开始支持GCD。 使用GCD的一个理由就是方便。回想一下以前的多线程编程,我们会把异步调用的代码放到另...
在Swift中使用Grand Central Dispatch来并行化并加速“for”循环?
I am trying to wrap my head around how to use GCD to parallelize and speed up Monte Carlo simulations. Most/all simple examples are presented for Obje...
iOS 多线程编程之Grand Central Dispatch(GCD)
介绍:Grand Central Dispatch 简称(GCD)是苹果公司开发的技术,以优化的应用程序支持多核心处理器和其它的对称多处理系统的系统。这建立在任务并行运行的线程池模式的基础上的。它首次公布在Mac OS X 10.6 。iOS 4及以上也可用。设计:GCD的工作原理是:让程序平行排队...