fifo

I'm writing a NodeJS script which interacts with a 3rd party application. The third party application will write data to a file for the duration that it's open. I'd like for my NodeJS application to receive this data in real-time. My script creates a fifo: child_process.spawnSync('mkfifo', [pipePath]); It then launches the 3rd party application using child_process.spawn . Finally, it reads from the pipe. let pipeHandle = await promisify(fs.open)(pipePath, fs.constants.O_RDONLY); let stream = fs.createReadStream(null, {fd: pipeHandle, autoClose: false}); stream.on('data', d => { console.log(d

I'm looking to stream lots of data (up to ~1 Gbit) from Java to a C++ application (both on the same machine). I'm currently using a FIFO on Linux but need a Windows solution too. The most cross-platform method seems to be a local socket, but: a) won't I get huge overhead from TCP checksumming and copying to & from kernel space, and b) won't the average user's firewall try to inspect the and maybe block the connection? It seems like a safer solution may be to use JNI and the Named Pipe API (\.\pipe\blah), making a god-awful platform-specific mess of both sides of the connection. Are these

简介： icm20948由两个裸片（die）构成，QFN封装（3x3x1mm 24PIN）。一个die集成3轴陀螺仪，3轴加速计和一个DMP，另一个die集成旭化成的AK09913的3轴磁力计。它支持以下功能： 1.512字节的FIFO（FIFO的大小根据DMP功能集而定） 2.运行时校准功能 3.增强的FSYNC功能，可改善类似EIS（视频防抖）应用的时序 陀螺仪可编程量程范围：±250dps ±500dps ±1000dps ±2000dps 加速计可编程量程范围：±2g ±4g ±8g ±16g 这两个传感器的灵敏度初始化（工厂校准）降低了产线的校准要求。 其他关键功能，片上16位ADC，可编程数字滤波器，内嵌的温度传感器以及可编程中断。设备功能接口有I2C和SPI，VDD操作电压范围1.71V到3.6V以及一个独立的数字IO供电，VDDIO从1.71V到1.95V。 与设备上的寄存器进行通信是通过I2C（高达100KHZ-标准或400KHZ-快速），或者高达7MHZ的SPI。 应用场景： 1.智能手机和平板 2.可穿戴传感器 3.IoT场景 4.无人机 功能： 1.陀螺仪： ① 输出X，Y和Z轴方向的角速度，可编程范围±250dps ±500dps ±1000dps ±2000dps以及集成的16位ADC ② 自定义的ODR；自定义的低通滤波 ③ 自检 ④输出数据率：

高性能六轴MEMS运动跟踪装置 概述 ICM 20602是一个6轴运动跟踪装置，它结合了一个3轴陀螺仪，3轴加速度计，在一个小的3毫米×3毫米×0.75毫米（16引脚LGA）封装。 高性能规格 陀螺仪灵敏度误差：±1% 陀螺仪噪声：4 mdps/√Hz 加速度计噪声：100μg/√Hz 包括1kB FIFO以减少串行总线接口上的通信量，并通过允许系统处理器突发读取传感器数据并进入低功耗模式来降低功耗 支持EIS FSYNC CM-20602包含片上16位ADC、可编程数字滤波器、嵌入式温度传感器和可编程中断。该设备的工作电压范围低至1.71V。通信端口包括I2C和10MHz的高速SPI。 方框图 应用 智能手机和平板电脑 可穿戴传感器 物联网应用 基于运动的游戏控制器 互联网连接DTV和机顶盒、3D鼠标 特性 可编程FSR±250 dps，±500 dps，±1000 dps，±2000 dps的三轴陀螺仪 可编程FSR±2g，±4G，±8g，±16g的三轴加速度计 用户可编程中断 应用处理器低功耗运行的唤醒运动中断 1kB FIFO缓冲区使应用程序处理器能够突发式读取数据 片上16位ADC和可编程滤波器 主机接口：10 MHz SPI或400 kHz快速模式I2C 数字输出温度传感器 VDD工作范围1.71V至3.45V 在晶圆级密封和粘合MEMS结构 符合RoHS和绿色标准

I'm trying to create a FIFO pipe between a python file and C file, but the issue is that when reading in the input from the C file, getline blocks until the writer end (in the python file) closes. C file: char fifo_emg[] = "emg"; mkfifo(fifo_emg, S_IRWXU); int fd_emg = open(fifo_emg, O_RDONLY); FILE* fp = fdopen(fd_emg, "r"); char *line = NULL; size_t len = 0; ssize_t _read; printf("Both ends open. Reading commands...\n"); while ((_read = getline(&line, &len, fp)) != -1) { printf("Comamnd: %s", line); } Python file: fifo = open("emg", "w"); while 1: line = raw_input("ENTER COMMAND: ") if line

Java初级黄金体验 其二 初级 Java IO : 第一个纪念碑 小程序大致功能 让我们看一下E盘有多少个文件 上代码 最近太多的作业 代码可以无限改进，君子回头十年不晚，先写软工去 package com.lxy.io; import java.io.File; import java.io.FileNotFoundException; import java.io.FileReader; import java.io.FileWriter; import java.io.IOException; import java.util.Scanner; /** 创建目录 @author lxy * E:\aa\ff */ public class IOt2 { //定义static属性 static String check_fuc; static String op_name; //定义输入函数 public static String shuru() { Scanner scanner = new Scanner(System.in); String key = scanner.nextLine(); return key; } `` public static void main(String[] args) throws IOException { //基础输出

为什么要写Spec文档: 记得刚进公司实习的时候，导师安排我写一个SM4算法AHB接口模块，要求写代码前 写出详细的设计文档，详细到什么程度呢，看着文档就能把代码写好，作为一个只 在学校写过数字钟的小白来说有点不太理解，后面看的Spec多了，好的Spec的确能够看 着Spec把代码给敲了，能够方便别人理解你的设计思路，特别是当你遇到一份注释不太 清楚，逻辑难懂的代码时，是多么渴望来一份Spec帮助理解。 网页上编辑图和格式不是很方便，就写的简单点吧 1 .同步FIFO(First In First Out) ：一种先进先出的数据缓存器,同步FIFO是指读写为同一时钟， 主要做数据缓存。本设计用8*256的双口RAM来做，主要是对RAM的控制，产生空、满信号。 2. 总体模块划分 子模块dpram.v 双口RAM的描述 子模块fifo_ctrl.v 对RAM的控制，产生空满信号 Top层 fifo_sync.v 对两个子模块的例化 (这里能用图来描述最好了) 3. dpram模块 信号列表 clk IN 时钟 rst_n IN 复位 wr_en IN 写使能 rd_en IN 读使能 wr_data[7:0] IN 写数据 wr_addr[7:0] IN 写地址 rd_addr[7:0] IN 读地址 rd_data[7:0] OUT 读数据 定义一块memory 8*256 电路图

Looking at some algorithm exercices on the net, I found an interesting one : How would you implement a FIFO using a LIFO ? I tried myself but I ended up with only one solution : each time we want the front element of the FIFO, copy the lifo into another lifo ( excluding last element, which is the front), get the front element and remove it, then copy back the second LIFO into the first LIFO. But this is of course horribly slow, it makes a simple loop like this : for(!myfifo.empty()) { myfifo.pop(); } going O(n²) instead of O(n) on a standard implementation of the FIFO. Of course, LIFO are not

I am writing a program for POSIX (OSX) where I will have many processes sending messages to one listener, who is essentially a logging thread. All of the processes are running in seperate programs, and using a single named pipe (FIFO) that many processes write to, but only a single process reads from is very tempting. Questions: 1) Will this work? - I can make this work using bash to setup a fifo with multiple processes writing to it, so I know in theory this works. But in practice, are there issues I'm glossing over? shell #1 $ mkfifo /tmp/fifo $ cat /tmp/fifo shells #2 and #3 $ cat > /tmp