v8 | 易学教程

Understanding on 'Error to Origin (50x)' , 'Internal CDN Error (50x)' and 'Ex...

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Overview This document explains about definition of these values on OUI Chartron. Definition of Error Types Error to Origin (50x) Hits/Sec The hits per seconds of response 504 . As RFC2616, "504" means "Gateway Timeout". But CS use this value for logging "Error to Origin". The situation to return response 504 : If PX-503 response header starts with "O ", then log as 504 . Internal CDN Error (50x) Hits/Sec Definition : The hits per seconds of response 505 . As RFC2616, "505" means "HTTP Version Not Supported". But CS use this value for logging "Internal CDN Error". The situation to return

联智通达什么是嵌入式工控主板?分类有哪些

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嵌入式主板是执行特定任务的大型系统的组成部分，由微处理器或微控制器(充当处理核心)组成。嵌入式主板被嵌入为完整设备的一部分，通常包括硬件和机械部件，并且专用于该设备的功能。嵌入式主板也被称为微控制器，已用于医疗机械，机动车辆，国防和航空航天，通信，医疗，自动化与控制以及汽车与运输领域。嵌入式主板专门用于执行特定任务，并用于通讯，娱乐，科学和技术。嵌入式主板市场的主要产品类型是： ARM，X86，PowerPC等等。其中ARM/MIPS/PowerPC均是基于精简指令集机器处理器的架构;X86则是基于复杂指令集的架构，Atom是x86或者是x86指令集的精简版。 ARM系列 ARM架构，过去称作进阶精简指令集机器是一个32位精简指令集(RISC)处理器架构，其广泛地使用在许多嵌入式系统设计。由于节能的特点，ARM处理器非常适用于行动通讯领域，符合其主要设计目标为低耗电的特性。 ARM处理器可以在很多消费性电子产品上看到，从可携式装置(PDA、移动电话、多媒体播放器、掌上型电子游戏，和计算机)到电脑外设(硬盘、桌上型路由器)甚至在导弹的弹载计算机等军用设施中都有他的存在。优势：价格低;能耗低。 x86系列 x86是英特尔Intel首先开发制造的一种微处理器体系结构的泛称。x86架构是重要的可变指令长度的CISC。向前兼容性一直都是在x86架构的发展背后一股驱动力量

What is the exact handling of the NodeJS Event Loop?

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问题 I know that NodeJS Event Loop collects Tasks from Event Queue and transfers control to the callback of the Task. When the task is completed, the Task transfers control from Event Loop. Therefore, I think that actually returning the callback is an Event Loop that has received control right from the Task. Is this the right idea? Also, if the assumption is correct about the blocking phenomenon that can occur in the Event Loop, if there is a delayed asynchronous task, can the event loop process

Typescript v8 natives syntax Expression expected

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问题 Using Typescript 4.1.2 is it possible to compile code that references the functions one calls when the --allow-natives-syntax flag in v8 is set? For example: function foo(bar: ()=>void)): void { %OptimizeFunctionOnNextCall(bar); // --> TS1109; Expression expected } Neither //@ts-ignore nor //@ts-expect-error silence this error 回答1: I don't have boilerplate to test v8 natives, so I don't know if it works, but You can try next piece of code function foo(bar: () => void): void { //@ts-ignore (

Google V8 - Neither v8.dll nor v8.dll.lib getting built in release mode

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问题 I've followed the Building with GN instructions to build Google V8 on Windows 10 with Visual Studio 2015. What I did: Getting V8, after downloading and unpacking the depot-tools. C:\build-depot> set DEPOT_TOOLS_WIN_TOOLCHAIN=0 C:\build-depot> gclient C:\build-depot> set GYP_MSVS_VERSION=2015 C:\build-depot> fetch v8 Generating build files... C:\build-depot\v8> python tools\dev\v8gen.py x64.debug C:\build-depot\v8> python tools\dev\v8gen.py x64.release ... and compiling C:\build-depot\v8>

Google V8 - Neither v8.dll nor v8.dll.lib getting built in release mode

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Are Node.js buffers in C++ addon null terminated?

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问题 I am trying to create buffer in a .js file, and then passing that buffer to a c++ addon where I will call a Windows API. In the c++ addon I have: auto buf = node::Buffer::Data(args[0]); auto len = node::Buffer::Length(args[0]); Are there any guarantees that node::Buffers are null-terminated? Or does node::Buffer::Length have any other form of safety check to prevent an overrun? 回答1: No. Think of buffers as a minimal data structure containing length and memory; they are not raw memory like

'v8::Value::ToNumber': was declared deprecated

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问题 I'm trying to access a known object and get one of its properties as a Number Unfortunately, the following code... Isolate *isolate = args.GetIsolate(); Local<Object> opts = args[0]->ToObject(); Local<Number> mode = opts->Get(String::NewFromUtf8(isolate, "mode"))->ToNumber(); is giving the following warning: warning C4996: 'v8::Value::ToNumber': was declared deprecated ....node-gyp\8.5.0\include\node\v8.h(9578): note: see declaration of 'v8::Value::ToNumber' In the v8.h I noticed the comment

Can we use Chrome V8 functionalities from GAS?

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问题 Since Apps Script runs in Chrome V8 engine, would it be possible to use any of V8 functionalities from Apps Script? I was wondering if it will be possible to build tools like headless browser, webpage screenshot, etc using Apps Script. I haven't read on these though, but would if it would be possible. Thanks 回答1: V8 is an ECMAScript engine, which is just one part of a browser. It doesn't know anything about the DOM, or CSS, or rendering, etc. So no, you can't use it to render screenshots of

How do I use std::string in a C++ Addon for Node.js?

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问题 I'm trying to wrap C++ objects for use in javascript as per the node.js documentation here: https://nodejs.org/api/addons.html#addons_wrapping_c_objects The Addon would build without error, and work properly when my object "AnObject" only had numeric attributes i.e "int32_t age;". When I added the attribute "std::string name;" to AnObject, "node-gyp configure" worked, however "node-gyp build" gave the following error: Wills-MacBook-Pro:cppObjectWrapping willalley$ node-gyp build [...] In file