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https://www.tsingfun.com/it/tech/897.html 

Android应用开发性能优化完全分析 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...程)都需要暂停,当GC垃圾回收完成之后所有线程才能够继续执行(这个细节下面小节会有详细介绍)。也就是说当在16ms内进行渲染等操作时如果刚好遇上大量GC操作则会导致渲染时间明显不足,也就从而导致了丢帧卡顿问题。 ...
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What are file descriptors, explained in simple terms?

.... Some of the values of TYPEs are: REG – Regular File DIR – Directory FIFO – First In First Out But all file descriptors are CHR – Character special file (or character device file) Now, we can identify the File Descriptors for STDIN, STDOUT and STDERR easy with lsof -p PID, or we ca...
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Notifier 通知扩展:功能强大的Android通知管理工具,支持通知通道、意图、...

...过应用程序设置手动执行此操作。他们也可以撤销权限或覆盖某些属性,例如禁止或允许播放通知声音。 UrsAI2NotificationChannel.AreNotificationsEnabled 属性指示是否已授予显示通知的一般权限。UrsAI2NotificationChannel.OpenNotificationSettings ...
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使用App Inventor扩展实现多点触控:Scale Detector · App Inventor 2 中文网

... 我们还创建了 SimpleOnScaleGestureListener 的适当子类。 这将覆盖 onScale 的默认事件处理,以调用块 Scale 事件处理程序: public class MyOnScaleGestureListener extends SimpleOnScaleGestureListener { // 我们覆盖普通 SimpleOnScaleGestureListener 的事件...
https://bbs.tsingfun.com/thread-2187-1-1.html 

计时器组件能不能在手机黑屏时继续工作? - App Inventor 2 中文网 - 清泛I...

有用户提问,计时器组件能不能在手机黑屏时继续工作? 其实,计时器组件有一个属性“一直计时”,默认是勾选的,开启一直计时的话,就能在App后台或者黑屏时继续触发计时事件。 通过简单的demo就能快速验证: ...
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Linux: compute a single hash for a given folder & contents?

... non standard file names How to proceed with files that are sockets, pipes/FIFOs, block devices, char devices? Must hash them as well? Don't update the access time of any entry while traversing because this will be a side effect and counter-productive(intuitive?) for certain use cases. This is wh...
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C++11 introduced a standardized memory model. What does it mean? And how is it going to affect C++ p

... performance and correctness of SC. For example, in certain architectures, FIFO write buffers are used by each core to hold the results of committed (retired) stores before writing the results to the caches. This optimization enhances performance but violates SC. The write buffer hides the latency o...
https://www.tsingfun.com/ilife/tech/1246.html 

婚庆O2O:领跑的企业也就只走到B轮 - 资讯 - 清泛网 - 专注C/C++及内核技术

...?我给你介绍个对象吧!啥时候结婚呐?年薪多少买房了?你看隔壁小王都有俩娃了,ba la ba la 俩娃你M。彷徨着彷徨着,春节的脚步近了,七大姑八大姨的脚步也近了,单身的别慌、未婚也别紧张,不就是结婚这点破事儿嘛...
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Synchronization vs Lock

... The main difference is fairness, in other words are requests handled FIFO or can there be barging? Method level synchronization ensures fair or FIFO allocation of the lock. Using synchronized(foo) { } or lock.acquire(); .....lock.release(); does not assure fairness. If you have lots ...
https://bbs.tsingfun.com/thread-1955-1-1.html 

AppInventor2关闭屏幕时,如何让计时器继续工作? - App应用开发 - 清泛IT...

转:AppInventor2关闭屏幕时,如何让计时器继续工作? 这是一个很好的问题,通过查看文档可以看到有一个“一直计时”属性,默认是勾选的: 这个属性就是用来控制App后台运行/屏幕关闭时,计时器是否继续工作的。 经...