iOS 的多读单写指的是多个线程可以同时读取共享的数据,但是只有一个线程能够写入数据。这是为了保证数据的一致性和避免竞争条件的出现。 一在Objective-C 中,可以使用 GCD 的并发队列来实现多读单写。具体实现步骤如下: 1.定义一个并发队列和一个串行队列,用于处理读操作和写操作,分别为 readQueue 和 writeQueue。
1.概念相关 * 1.1 GCD(Grand Central Dispatch)是基于C语言开发的多线程开发技术(其它多线程技术后面再续),完全面向过程,使用起来也是最简单的,主要是适应当今多核并行运算需求下提出的一套解决方案。比如说在智能手机刚问世的那个年代,打开手机QQ,当此时有了其它应用需要被启动的时候,此时必须把QQ关掉才能打开你...
-(void)test10{dispatch_queue_tserialQueue1 = dispatch_queue_create("com.cmjstudio.dispatch1", DISPATCH_QUEUE_SERIAL);dispatch_queue_tserialQueue2 = dispatch_queue_create("com.cmjstudio.dispatch2", DISPATCH_QUEUE_SERIAL);dispatch_queue_tserialQueue3 = dispatch_queue_create("com.cmjstudio.dispatc...
@lavro-sindi, your code: int gcd(int a, int b){ return b == 0 ? a: gcd(b, a%b); } → Reply adamant 11 years ago, # ^ | +7 int gcd(int a, int b) { return b ? gcd(b, a%b) : a; } → Reply gfonn 9 years ago, # ^ | -26 int gcd(int a,int b...
I have some code to init map with points. Coord of points I get from json and in the end of file I have a filter. I need to hide/show some points on map. How I can do it? setStyle() or change size of ... Trouble recording videos ...
let queue = DispatchQueue(label: "com.leacode.gcd.serialqueue") queue.async { // 在queue线程执行 DispatchQueue.main.async { // 回到主线程 } } 2、Create a concurrent queue 创建一个concurrent queue OC 代码语言:javascript 代码运行次数:0 运行 AI代码解释 dispatch_queue_t concurrentQueue = dispa...
Code Pull requests Actions Projects Security Insights Insights: woolie/GCDWebServerPulse Contributors Commits Code frequency Dependency graph Network Forks Forks switch to list view swisspol / GCDWebServer 02002love / GCDWebServer 09jianfeng / GCDWebServer 0xpablo / GCDWebServer ...
With __assume or with while loop: surprisingly with __assume code is slightly better (I’d expect it to be same), but both versions still check for 0 for non-AVX2: cmp edi, 5 // check for AVX2 jl SHORT $LN13@gcd2 tzcnt ecx, edx // A...
View code README.md WARNING there have been reports of apps being rejected when Reachability is used in a framework. The only solution to this so far is to rename the class. Reachability This is a drop-in replacement for Apple's Reachability class. It is ARC-compatible, and it uses ...
给一个集合,大小为n , 求所有子集的gcd 的期望和 。 期望的定义为 这个子集的最大公约数的K次方 ; 每个元素被选中的概率是等可能的 即概率 p = (发生的事件数)/(总的事件数); 总的事件数 = 2^n -1; 大小为n的集合的非空子集个数为2^n -1 ...