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Arduino | opensource electronics platform

 by   arduino Java Version: 1.8.19 License: Non-SPDX

 by   arduino Java Version: 1.8.19 License: Non-SPDX

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kandi X-RAY | Arduino Summary

Arduino is a Java library typically used in Internet of Things (IoT), Arduino applications. Arduino has no bugs, it has no vulnerabilities and it has medium support. However Arduino build file is not available and it has a Non-SPDX License. You can download it from GitHub.
Arduino is an open-source physical computing platform based on a simple I/O board and a development environment that implements the Processing/Wiring language. Arduino can be used to develop stand-alone interactive objects or can be connected to software on your computer (e.g. Flash, Processing and MaxMSP). The boards can be assembled by hand or purchased preassembled; the open-source IDE can be downloaded for free at https://arduino.cc.
Support
Support
Quality
Quality
Security
Security
License
License
Reuse
Reuse

kandi-support Support

  • Arduino has a medium active ecosystem.
  • It has 12500 star(s) with 6979 fork(s). There are 1095 watchers for this library.
  • There were 4 major release(s) in the last 12 months.
  • There are 774 open issues and 9027 have been closed. On average issues are closed in 167 days. There are 106 open pull requests and 0 closed requests.
  • It has a neutral sentiment in the developer community.
  • The latest version of Arduino is 1.8.19
Arduino Support
Best in #Java
Average in #Java
Arduino Support
Best in #Java
Average in #Java

quality kandi Quality

  • Arduino has 0 bugs and 0 code smells.
Arduino Quality
Best in #Java
Average in #Java
Arduino Quality
Best in #Java
Average in #Java

securitySecurity

  • Arduino has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
  • Arduino code analysis shows 0 unresolved vulnerabilities.
  • There are 0 security hotspots that need review.
Arduino Security
Best in #Java
Average in #Java
Arduino Security
Best in #Java
Average in #Java

license License

  • Arduino has a Non-SPDX License.
  • Non-SPDX licenses can be open source with a non SPDX compliant license, or non open source licenses, and you need to review them closely before use.
Arduino License
Best in #Java
Average in #Java
Arduino License
Best in #Java
Average in #Java

buildReuse

  • Arduino releases are available to install and integrate.
  • Arduino has no build file. You will be need to create the build yourself to build the component from source.
  • Installation instructions are available. Examples and code snippets are not available.
  • Arduino saves you 19025 person hours of effort in developing the same functionality from scratch.
  • It has 37425 lines of code, 2603 functions and 359 files.
  • It has medium code complexity. Code complexity directly impacts maintainability of the code.
Arduino Reuse
Best in #Java
Average in #Java
Arduino Reuse
Best in #Java
Average in #Java
Top functions reviewed by kandi - BETA

kandi has reviewed Arduino and discovered the below as its top functions. This is intended to give you an instant insight into Arduino implemented functionality, and help decide if they suit your requirements.

  • Builds the examples menu .
  • Create the menu for the edit menu .
  • Parses command line arguments .
  • Initialize the button .
  • Initialize the window .
  • Installs the installed tools .
  • Configure the popup menu .
  • Add a file to this sketch .
  • Shows preferences data .
  • Populate the import - to - library table .

Arduino Key Features

open-source electronics platform

C++11 multithreaded cancellable slice-based work

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#pragma once
#include <iostream>
#include <future>

class sliceWork
{
public:
    sliceWork(int sliceInterval, int maxFails, const char* label);
    ~sliceWork();
    void initWork();
    void signalTerminate();

protected:
    virtual void init()
    {
        std::cout << "Init " << label << "..\n";
    }
    virtual bool oneSliceWork()
    {
        std::cout << "Working " << label << "..\n";
        return true;
    }
    void work(std::future<void> future);

private:
    int sliceIntervalMilliSeconds;
    int failureCounter;
    int maxFailsBeforeRestart;
    char* label = NULL;
    std::promise<void> workPromise;
    std::thread* workerThread = NULL;
};
#include <string.h>
#include "sliceWork.h"

class A : public sliceWork
{
public:
    A(int slice, int max, const char* label)
        : sliceWork(slice, max, label)
    {
    }
};

class B : public sliceWork
{
public:
    B(int slice, int max, const char* label)
        : sliceWork(slice, max, label)
    {
    }
};

class C : public sliceWork
{
public:
    C(int slice, int max, const char* label)
        : sliceWork(slice, max, label)
    {
    }
};

int main()
{
    {
        A a(1000, 1000, "A");
        a.initWork();
        B b(2000, 1000, "B");
        b.initWork();
        C c(700, 2, "C");
        c.initWork();
        std::cout << "Initializations finished!\n";
        ::std::this_thread::sleep_for(::std::chrono::seconds(7));
        a.signalTerminate();
        ::std::this_thread::sleep_for(::std::chrono::seconds(5));
        b.signalTerminate();
        ::std::this_thread::sleep_for(::std::chrono::seconds(4));
        c.signalTerminate();
    }
    getchar();
    return 0;
}
#include <string.h>
#include "sliceWork.h"

sliceWork::sliceWork(int interval, int maxFails, const char* workLabel)
{
    sliceIntervalMilliSeconds = interval;
    maxFailsBeforeRestart = maxFails;
    label = new char[strlen(workLabel) + 1];
    strcpy(label, workLabel);
}

sliceWork::~sliceWork()
{
    if (workerThread != NULL && workerThread->joinable())
        workerThread->join();
    printf("destructor %s\n", label);
    delete label;
    delete workerThread;
}

void sliceWork::initWork()
{
    failureCounter = 0;
    init();
    printf("Init work %s finished!\n", label);
    std::future<void> futureWorker = workPromise.get_future();
    workerThread = new std::thread(&sliceWork::work, this, move(futureWorker));
}

void sliceWork::work(std::future<void> future)
{
    using namespace ::std::chrono;
    steady_clock::time_point t0 = steady_clock::now();

    while (future.wait_for(std::chrono::milliseconds(1)) == std::future_status::timeout)
    {
        if (duration_cast<std::chrono::milliseconds>(steady_clock::now() - t0).count()
            > sliceIntervalMilliSeconds)
        {
            if (!oneSliceWork())
            {
                if (++failureCounter > maxFailsBeforeRestart
                    && maxFailsBeforeRestart > 0)
                {
                    init();
                    failureCounter = 0;
                }
            }
            t0 = steady_clock::now();
        }
    }
    printf("work terminated for %s!\n", label);
}

void sliceWork::signalTerminate()
{
    printf("request terminate for work %s...\n", label);
    workPromise.set_value();
}
-----------------------
#pragma once
#include <iostream>
#include <future>

class sliceWork
{
public:
    sliceWork(int sliceInterval, int maxFails, const char* label);
    ~sliceWork();
    void initWork();
    void signalTerminate();

protected:
    virtual void init()
    {
        std::cout << "Init " << label << "..\n";
    }
    virtual bool oneSliceWork()
    {
        std::cout << "Working " << label << "..\n";
        return true;
    }
    void work(std::future<void> future);

private:
    int sliceIntervalMilliSeconds;
    int failureCounter;
    int maxFailsBeforeRestart;
    char* label = NULL;
    std::promise<void> workPromise;
    std::thread* workerThread = NULL;
};
#include <string.h>
#include "sliceWork.h"

class A : public sliceWork
{
public:
    A(int slice, int max, const char* label)
        : sliceWork(slice, max, label)
    {
    }
};

class B : public sliceWork
{
public:
    B(int slice, int max, const char* label)
        : sliceWork(slice, max, label)
    {
    }
};

class C : public sliceWork
{
public:
    C(int slice, int max, const char* label)
        : sliceWork(slice, max, label)
    {
    }
};

int main()
{
    {
        A a(1000, 1000, "A");
        a.initWork();
        B b(2000, 1000, "B");
        b.initWork();
        C c(700, 2, "C");
        c.initWork();
        std::cout << "Initializations finished!\n";
        ::std::this_thread::sleep_for(::std::chrono::seconds(7));
        a.signalTerminate();
        ::std::this_thread::sleep_for(::std::chrono::seconds(5));
        b.signalTerminate();
        ::std::this_thread::sleep_for(::std::chrono::seconds(4));
        c.signalTerminate();
    }
    getchar();
    return 0;
}
#include <string.h>
#include "sliceWork.h"

sliceWork::sliceWork(int interval, int maxFails, const char* workLabel)
{
    sliceIntervalMilliSeconds = interval;
    maxFailsBeforeRestart = maxFails;
    label = new char[strlen(workLabel) + 1];
    strcpy(label, workLabel);
}

sliceWork::~sliceWork()
{
    if (workerThread != NULL && workerThread->joinable())
        workerThread->join();
    printf("destructor %s\n", label);
    delete label;
    delete workerThread;
}

void sliceWork::initWork()
{
    failureCounter = 0;
    init();
    printf("Init work %s finished!\n", label);
    std::future<void> futureWorker = workPromise.get_future();
    workerThread = new std::thread(&sliceWork::work, this, move(futureWorker));
}

void sliceWork::work(std::future<void> future)
{
    using namespace ::std::chrono;
    steady_clock::time_point t0 = steady_clock::now();

    while (future.wait_for(std::chrono::milliseconds(1)) == std::future_status::timeout)
    {
        if (duration_cast<std::chrono::milliseconds>(steady_clock::now() - t0).count()
            > sliceIntervalMilliSeconds)
        {
            if (!oneSliceWork())
            {
                if (++failureCounter > maxFailsBeforeRestart
                    && maxFailsBeforeRestart > 0)
                {
                    init();
                    failureCounter = 0;
                }
            }
            t0 = steady_clock::now();
        }
    }
    printf("work terminated for %s!\n", label);
}

void sliceWork::signalTerminate()
{
    printf("request terminate for work %s...\n", label);
    workPromise.set_value();
}
-----------------------
#pragma once
#include <iostream>
#include <future>

class sliceWork
{
public:
    sliceWork(int sliceInterval, int maxFails, const char* label);
    ~sliceWork();
    void initWork();
    void signalTerminate();

protected:
    virtual void init()
    {
        std::cout << "Init " << label << "..\n";
    }
    virtual bool oneSliceWork()
    {
        std::cout << "Working " << label << "..\n";
        return true;
    }
    void work(std::future<void> future);

private:
    int sliceIntervalMilliSeconds;
    int failureCounter;
    int maxFailsBeforeRestart;
    char* label = NULL;
    std::promise<void> workPromise;
    std::thread* workerThread = NULL;
};
#include <string.h>
#include "sliceWork.h"

class A : public sliceWork
{
public:
    A(int slice, int max, const char* label)
        : sliceWork(slice, max, label)
    {
    }
};

class B : public sliceWork
{
public:
    B(int slice, int max, const char* label)
        : sliceWork(slice, max, label)
    {
    }
};

class C : public sliceWork
{
public:
    C(int slice, int max, const char* label)
        : sliceWork(slice, max, label)
    {
    }
};

int main()
{
    {
        A a(1000, 1000, "A");
        a.initWork();
        B b(2000, 1000, "B");
        b.initWork();
        C c(700, 2, "C");
        c.initWork();
        std::cout << "Initializations finished!\n";
        ::std::this_thread::sleep_for(::std::chrono::seconds(7));
        a.signalTerminate();
        ::std::this_thread::sleep_for(::std::chrono::seconds(5));
        b.signalTerminate();
        ::std::this_thread::sleep_for(::std::chrono::seconds(4));
        c.signalTerminate();
    }
    getchar();
    return 0;
}
#include <string.h>
#include "sliceWork.h"

sliceWork::sliceWork(int interval, int maxFails, const char* workLabel)
{
    sliceIntervalMilliSeconds = interval;
    maxFailsBeforeRestart = maxFails;
    label = new char[strlen(workLabel) + 1];
    strcpy(label, workLabel);
}

sliceWork::~sliceWork()
{
    if (workerThread != NULL && workerThread->joinable())
        workerThread->join();
    printf("destructor %s\n", label);
    delete label;
    delete workerThread;
}

void sliceWork::initWork()
{
    failureCounter = 0;
    init();
    printf("Init work %s finished!\n", label);
    std::future<void> futureWorker = workPromise.get_future();
    workerThread = new std::thread(&sliceWork::work, this, move(futureWorker));
}

void sliceWork::work(std::future<void> future)
{
    using namespace ::std::chrono;
    steady_clock::time_point t0 = steady_clock::now();

    while (future.wait_for(std::chrono::milliseconds(1)) == std::future_status::timeout)
    {
        if (duration_cast<std::chrono::milliseconds>(steady_clock::now() - t0).count()
            > sliceIntervalMilliSeconds)
        {
            if (!oneSliceWork())
            {
                if (++failureCounter > maxFailsBeforeRestart
                    && maxFailsBeforeRestart > 0)
                {
                    init();
                    failureCounter = 0;
                }
            }
            t0 = steady_clock::now();
        }
    }
    printf("work terminated for %s!\n", label);
}

void sliceWork::signalTerminate()
{
    printf("request terminate for work %s...\n", label);
    workPromise.set_value();
}

exec: &quot;python&quot;: executable file not found in $PATH on Arduino IDE

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sudo ln -s /path/to/python3 /usr/local/bin/python

How to filter a class in Angular?

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<ng-container *ngIf="this.project.arduino">
this.newList = [];
if (this.project.arduino) {
this.newList.push(project)
}
-----------------------
<ng-container *ngIf="this.project.arduino">
this.newList = [];
if (this.project.arduino) {
this.newList.push(project)
}
-----------------------
<div class="project-list">
  <ul>
    <ng-container *ngFor="let project of projects">
      <li *ngIf="project.arduino == true" class="project">
        <a [routerLink]="['/project', project._id]">
          <div class="image-box">
            <div class="image">
              <img src="{{ url+'get-image/'+project.imagefront }}" *ngIf="project.imagefront" />
            </div>
          </div>
        </a>
      </li>
    </ng-container>
  </ul>
</div>

Stop text from overlapping html and css

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.bar-element {
    display: flex;
    flex-direction: row;
}

@media (max-width:700px){
    .bar-element {
        display: flex;
        flex-direction: column;
    }
}
.flex {
  display: flex;
  flex-direction: row;
}

p {
  margin: 5px;
}

@media (max-width:700px){
   .flex {
      display: flex;
      flex-direction: column;
    }

}
<div class="flex">
  <p>Hello</p>
  <p>Hello</p>
  <p>Hello</p>
</div>
<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<style>
    /* .flex_container {
        display: flex;
        flex-wrap: wrap;
        min-width: 550px;
        flex-direction: column;
        position: relative;
    } */
    
    .bar {
        position: relative;
        background-color: rgb(41, 80, 143);
        border: 5px solid rgb(46, 84, 149);
        height: 30px;
        width: auto;
        margin: 0;
        display: flex;
        flex-direction: row;
        justify-content: space-between;
    }
    
    .tekst {
        color: white;
        text-transform: uppercase;
        text-align: center;
        margin: 0;
        vertical-align: middle;
        line-height: 30px;
        font-family: Arial, Helvetica, sans-serif;
    }
    
    .ccontroller {
        display: flex;
        flex-direction: row;
        width: fit-content;
        flex-wrap: wrap;
        justify-content: flex-end;
        justify-self: flex-end;
    }
    
    .creator1 {
        display: block;
        font-size: 25px;
        color: white;
        text-align: left;
        margin: 0;
        line-height: auto;
        font-family: Arial, Helvetica, sans-serif;
        margin-right: 10px;
    }
    
    .creator2 {
        display: block;
        color: white;
        font-size: 25px;
        text-align: left;
        margin: 0;
        line-height: auto;
        font-family: Arial, Helvetica, sans-serif;
    }
    
    .aboutus {
        display: block;
        -ms-transform: translate(-50%, -50%);
        transform: translate(-50%, -50%);
        color: white;
        background-color: #123456;
        height: fit-content;
        width: auto;
        margin-top: 16px;
        margin-left: 50px;
        text-align: center;
    }
    
    body {
        background-color: #123456;
        background-repeat: no-repeat;
        background-position: center;
        background-attachment: fixed;
        background-size: 100% 100%;
        min-width: 550px;
        position: relative;
        margin: 0;
        padding: 0;
    }
    
    html,
    body {
        position: relative;
        margin: 0;
        padding: 0;
    }
    
    @media (max-width:700px) {
        .bar {
            display: flex;
            flex-direction: column;
        }
        .ccontroller {
            display: flex;
            flex-direction: column;
        }
    }
</style>

<body>
    <div class="flex_container">
        <div class="bar">
            <h1 class="tekst" title="Coffeesnakes">Coffeesnakes</h1>
            <button class="aboutus" onclick="func()">About us!</button>
            <div class="ccontroller">
                <p class="creator1" title="Can code: Java, c#, html, js, python, arduino">Christian2B</p>
                <p class="creator2" title="Can code: html, python, js ">Timgb11</p>
            </div>
        </div>
    </div>
</body>

</html>
-----------------------
.bar-element {
    display: flex;
    flex-direction: row;
}

@media (max-width:700px){
    .bar-element {
        display: flex;
        flex-direction: column;
    }
}
.flex {
  display: flex;
  flex-direction: row;
}

p {
  margin: 5px;
}

@media (max-width:700px){
   .flex {
      display: flex;
      flex-direction: column;
    }

}
<div class="flex">
  <p>Hello</p>
  <p>Hello</p>
  <p>Hello</p>
</div>
<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<style>
    /* .flex_container {
        display: flex;
        flex-wrap: wrap;
        min-width: 550px;
        flex-direction: column;
        position: relative;
    } */
    
    .bar {
        position: relative;
        background-color: rgb(41, 80, 143);
        border: 5px solid rgb(46, 84, 149);
        height: 30px;
        width: auto;
        margin: 0;
        display: flex;
        flex-direction: row;
        justify-content: space-between;
    }
    
    .tekst {
        color: white;
        text-transform: uppercase;
        text-align: center;
        margin: 0;
        vertical-align: middle;
        line-height: 30px;
        font-family: Arial, Helvetica, sans-serif;
    }
    
    .ccontroller {
        display: flex;
        flex-direction: row;
        width: fit-content;
        flex-wrap: wrap;
        justify-content: flex-end;
        justify-self: flex-end;
    }
    
    .creator1 {
        display: block;
        font-size: 25px;
        color: white;
        text-align: left;
        margin: 0;
        line-height: auto;
        font-family: Arial, Helvetica, sans-serif;
        margin-right: 10px;
    }
    
    .creator2 {
        display: block;
        color: white;
        font-size: 25px;
        text-align: left;
        margin: 0;
        line-height: auto;
        font-family: Arial, Helvetica, sans-serif;
    }
    
    .aboutus {
        display: block;
        -ms-transform: translate(-50%, -50%);
        transform: translate(-50%, -50%);
        color: white;
        background-color: #123456;
        height: fit-content;
        width: auto;
        margin-top: 16px;
        margin-left: 50px;
        text-align: center;
    }
    
    body {
        background-color: #123456;
        background-repeat: no-repeat;
        background-position: center;
        background-attachment: fixed;
        background-size: 100% 100%;
        min-width: 550px;
        position: relative;
        margin: 0;
        padding: 0;
    }
    
    html,
    body {
        position: relative;
        margin: 0;
        padding: 0;
    }
    
    @media (max-width:700px) {
        .bar {
            display: flex;
            flex-direction: column;
        }
        .ccontroller {
            display: flex;
            flex-direction: column;
        }
    }
</style>

<body>
    <div class="flex_container">
        <div class="bar">
            <h1 class="tekst" title="Coffeesnakes">Coffeesnakes</h1>
            <button class="aboutus" onclick="func()">About us!</button>
            <div class="ccontroller">
                <p class="creator1" title="Can code: Java, c#, html, js, python, arduino">Christian2B</p>
                <p class="creator2" title="Can code: html, python, js ">Timgb11</p>
            </div>
        </div>
    </div>
</body>

</html>
-----------------------
.bar-element {
    display: flex;
    flex-direction: row;
}

@media (max-width:700px){
    .bar-element {
        display: flex;
        flex-direction: column;
    }
}
.flex {
  display: flex;
  flex-direction: row;
}

p {
  margin: 5px;
}

@media (max-width:700px){
   .flex {
      display: flex;
      flex-direction: column;
    }

}
<div class="flex">
  <p>Hello</p>
  <p>Hello</p>
  <p>Hello</p>
</div>
<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<style>
    /* .flex_container {
        display: flex;
        flex-wrap: wrap;
        min-width: 550px;
        flex-direction: column;
        position: relative;
    } */
    
    .bar {
        position: relative;
        background-color: rgb(41, 80, 143);
        border: 5px solid rgb(46, 84, 149);
        height: 30px;
        width: auto;
        margin: 0;
        display: flex;
        flex-direction: row;
        justify-content: space-between;
    }
    
    .tekst {
        color: white;
        text-transform: uppercase;
        text-align: center;
        margin: 0;
        vertical-align: middle;
        line-height: 30px;
        font-family: Arial, Helvetica, sans-serif;
    }
    
    .ccontroller {
        display: flex;
        flex-direction: row;
        width: fit-content;
        flex-wrap: wrap;
        justify-content: flex-end;
        justify-self: flex-end;
    }
    
    .creator1 {
        display: block;
        font-size: 25px;
        color: white;
        text-align: left;
        margin: 0;
        line-height: auto;
        font-family: Arial, Helvetica, sans-serif;
        margin-right: 10px;
    }
    
    .creator2 {
        display: block;
        color: white;
        font-size: 25px;
        text-align: left;
        margin: 0;
        line-height: auto;
        font-family: Arial, Helvetica, sans-serif;
    }
    
    .aboutus {
        display: block;
        -ms-transform: translate(-50%, -50%);
        transform: translate(-50%, -50%);
        color: white;
        background-color: #123456;
        height: fit-content;
        width: auto;
        margin-top: 16px;
        margin-left: 50px;
        text-align: center;
    }
    
    body {
        background-color: #123456;
        background-repeat: no-repeat;
        background-position: center;
        background-attachment: fixed;
        background-size: 100% 100%;
        min-width: 550px;
        position: relative;
        margin: 0;
        padding: 0;
    }
    
    html,
    body {
        position: relative;
        margin: 0;
        padding: 0;
    }
    
    @media (max-width:700px) {
        .bar {
            display: flex;
            flex-direction: column;
        }
        .ccontroller {
            display: flex;
            flex-direction: column;
        }
    }
</style>

<body>
    <div class="flex_container">
        <div class="bar">
            <h1 class="tekst" title="Coffeesnakes">Coffeesnakes</h1>
            <button class="aboutus" onclick="func()">About us!</button>
            <div class="ccontroller">
                <p class="creator1" title="Can code: Java, c#, html, js, python, arduino">Christian2B</p>
                <p class="creator2" title="Can code: html, python, js ">Timgb11</p>
            </div>
        </div>
    </div>
</body>

</html>
-----------------------
.bar-element {
    display: flex;
    flex-direction: row;
}

@media (max-width:700px){
    .bar-element {
        display: flex;
        flex-direction: column;
    }
}
.flex {
  display: flex;
  flex-direction: row;
}

p {
  margin: 5px;
}

@media (max-width:700px){
   .flex {
      display: flex;
      flex-direction: column;
    }

}
<div class="flex">
  <p>Hello</p>
  <p>Hello</p>
  <p>Hello</p>
</div>
<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<style>
    /* .flex_container {
        display: flex;
        flex-wrap: wrap;
        min-width: 550px;
        flex-direction: column;
        position: relative;
    } */
    
    .bar {
        position: relative;
        background-color: rgb(41, 80, 143);
        border: 5px solid rgb(46, 84, 149);
        height: 30px;
        width: auto;
        margin: 0;
        display: flex;
        flex-direction: row;
        justify-content: space-between;
    }
    
    .tekst {
        color: white;
        text-transform: uppercase;
        text-align: center;
        margin: 0;
        vertical-align: middle;
        line-height: 30px;
        font-family: Arial, Helvetica, sans-serif;
    }
    
    .ccontroller {
        display: flex;
        flex-direction: row;
        width: fit-content;
        flex-wrap: wrap;
        justify-content: flex-end;
        justify-self: flex-end;
    }
    
    .creator1 {
        display: block;
        font-size: 25px;
        color: white;
        text-align: left;
        margin: 0;
        line-height: auto;
        font-family: Arial, Helvetica, sans-serif;
        margin-right: 10px;
    }
    
    .creator2 {
        display: block;
        color: white;
        font-size: 25px;
        text-align: left;
        margin: 0;
        line-height: auto;
        font-family: Arial, Helvetica, sans-serif;
    }
    
    .aboutus {
        display: block;
        -ms-transform: translate(-50%, -50%);
        transform: translate(-50%, -50%);
        color: white;
        background-color: #123456;
        height: fit-content;
        width: auto;
        margin-top: 16px;
        margin-left: 50px;
        text-align: center;
    }
    
    body {
        background-color: #123456;
        background-repeat: no-repeat;
        background-position: center;
        background-attachment: fixed;
        background-size: 100% 100%;
        min-width: 550px;
        position: relative;
        margin: 0;
        padding: 0;
    }
    
    html,
    body {
        position: relative;
        margin: 0;
        padding: 0;
    }
    
    @media (max-width:700px) {
        .bar {
            display: flex;
            flex-direction: column;
        }
        .ccontroller {
            display: flex;
            flex-direction: column;
        }
    }
</style>

<body>
    <div class="flex_container">
        <div class="bar">
            <h1 class="tekst" title="Coffeesnakes">Coffeesnakes</h1>
            <button class="aboutus" onclick="func()">About us!</button>
            <div class="ccontroller">
                <p class="creator1" title="Can code: Java, c#, html, js, python, arduino">Christian2B</p>
                <p class="creator2" title="Can code: html, python, js ">Timgb11</p>
            </div>
        </div>
    </div>
</body>

</html>
-----------------------
.flex-box {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
}

p {
  margin: 5px;
  min-width:200px;
}
<div class="flex-box">
  <p>foo</p>
  <p>bar</p>
  <p>baz</p>
</div>
-----------------------
.flex-box {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
}

p {
  margin: 5px;
  min-width:200px;
}
<div class="flex-box">
  <p>foo</p>
  <p>bar</p>
  <p>baz</p>
</div>
-----------------------
.flex_container {
  display: flex;
  flex-wrap: wrap;
  min-width: 550px;
  flex-direction: column;
  position: relative;
}

.bar {
  position: relative;
  background-color: rgb(41, 80, 143);
  border: 5px solid rgb(46, 84, 149);
  height: 30px;
  width: auto;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
}

.tekst {
  color: white;
  position: static;
  text-transform: uppercase;
  text-align: center;
  margin: 0;
  justify-content: center;
  vertical-align: middle;
  line-height: 30px;
  font-family: Arial, Helvetica, sans-serif;
}

.ccontroller {
  margin-top: -12px;
}

.creator1 {
  font-size: 25px;
  color: white;
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
}

.creator2 {
  color: white;
  font-size: 25px;
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
}

.aboutus {
  margin: 0;
  color: white;
  background-color: #123456;
  width: auto;
}

body {
  background-color: #123456;
  background-repeat: no-repeat;
  background-position: center;
  background-attachment: fixed;
  background-size: 100% 100%;
  min-width: 550px;
  position: relative;
  margin: 0;
  padding: 0;
}

html,
body {
  min-width: 550px;
  position: relative;
  margin: 0;
  padding: 0;
}
<body>
  <div class="flex_container">
    <div class="bar">
      <p class="creator1" title="Can code: Java, c#, html, js, python, arduino">Christian2B</p>
      <h1 class="tekst" title="Coffeesnakes">Coffeesnakes</h1>
      <p class="creator2" title="Can code: html, python, js ">Timgb11</p>
      <button class="aboutus" onclick="func()">About us!</button>
    </div>
  </div>
</body>
-----------------------
.flex_container {
  display: flex;
  flex-wrap: wrap;
  min-width: 550px;
  flex-direction: column;
  position: relative;
}

.bar {
  position: relative;
  background-color: rgb(41, 80, 143);
  border: 5px solid rgb(46, 84, 149);
  height: 30px;
  width: auto;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
}

.tekst {
  color: white;
  position: static;
  text-transform: uppercase;
  text-align: center;
  margin: 0;
  justify-content: center;
  vertical-align: middle;
  line-height: 30px;
  font-family: Arial, Helvetica, sans-serif;
}

.ccontroller {
  margin-top: -12px;
}

.creator1 {
  font-size: 25px;
  color: white;
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
}

.creator2 {
  color: white;
  font-size: 25px;
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
}

.aboutus {
  margin: 0;
  color: white;
  background-color: #123456;
  width: auto;
}

body {
  background-color: #123456;
  background-repeat: no-repeat;
  background-position: center;
  background-attachment: fixed;
  background-size: 100% 100%;
  min-width: 550px;
  position: relative;
  margin: 0;
  padding: 0;
}

html,
body {
  min-width: 550px;
  position: relative;
  margin: 0;
  padding: 0;
}
<body>
  <div class="flex_container">
    <div class="bar">
      <p class="creator1" title="Can code: Java, c#, html, js, python, arduino">Christian2B</p>
      <h1 class="tekst" title="Coffeesnakes">Coffeesnakes</h1>
      <p class="creator2" title="Can code: html, python, js ">Timgb11</p>
      <button class="aboutus" onclick="func()">About us!</button>
    </div>
  </div>
</body>

What is the Rust equivalent of Serial.println from the Arduino C++ API?

copy iconCopydownload iconDownload
let dp = arduino_hal::Peripherals::take().unwrap();
let pins = arduino_hal::pins!(dp);
let mut serial = arduino_hal::default_serial!(dp, pins, 115200);
ufmt::uwriteln!(&mut serial, "{} bytes available", count);
-----------------------
let dp = arduino_hal::Peripherals::take().unwrap();
let pins = arduino_hal::pins!(dp);
let mut serial = arduino_hal::default_serial!(dp, pins, 115200);
ufmt::uwriteln!(&mut serial, "{} bytes available", count);

How to make an object take and store an Array of arbitrary, but compile-time known size?

copy iconCopydownload iconDownload
struct Runner {
    span<const Point> profile;
    void foo() {
        for(auto point : profile) {
            // do something
        }
    }
};

Point points[] {
    // ... number of points doesn't matter
};
Runner runner {
    .profile = points,
};
-----------------------
#include <iostream>

struct RunnerInterface {
    virtual int* begin() = 0;
    virtual int* end() = 0;
    virtual ~RunnerInterface(){}
};

template <unsigned size>
struct Runner : RunnerInterface {
    int data[size];
    int* begin() override { return data; }
    int* end() override { return data+size; } // pointer one past the end if fine (it won't get dereferenced)
};

void foo(RunnerInterface& ri) {
    for (auto it = ri.begin(); it != ri.end(); ++it){
        *it = 42;
    }
}

void bar(RunnerInterface& ri){
    for (auto it = ri.begin(); it != ri.end(); ++it){
        std::cout << *it;
    }
}

int main() {
    Runner<42> r;
    foo(r);
    bar(r);
}

how to clear oled display in micropython

copy iconCopydownload iconDownload
oled.fill(0)
oled.show()

Kalman filtering IMU noise c#

copy iconCopydownload iconDownload
    auto state = K.getxcopy();
    for (int i = 0; i < state.Cols; i++)
    {
        for (int j = 0; j < state.Rows; j++)
        {
            Serial.print(state(i, j));
            Serial.print(" | ");
        }
        Serial.println();
    }

How do I clear a stream in C++ for a nanoPB protocol buffer to use?

copy iconCopydownload iconDownload
pb_ostream_t stream = pb_ostream_from_buffer(buffer, sizeof(buffer));
stream = pb_ostream_from_buffer(buffer, sizeof(buffer));
-----------------------
pb_ostream_t stream = pb_ostream_from_buffer(buffer, sizeof(buffer));
stream = pb_ostream_from_buffer(buffer, sizeof(buffer));

Python serial.read() doesn't read data from Arduino in the first loop

copy iconCopydownload iconDownload
ser = serial.Serial("/dev/cu.usbserial-1420", baudrate=115200, timeout=0)

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QUESTION

C++11 multithreaded cancellable slice-based work

Asked 2022-Apr-17 at 18:39

I am trying to create a base class to manage a slice-based workload.
My approach was to create a base abstract class that handles the initialization/termination of the work and inherit from that class in specific classes that only specify the actual work and timings.
I also added the functionality in the base class to reinitialize the workload if a set number of errors occur.

This works as expected in a simple example (given below) and with most workloads that I have but when I try to use this with a specific workload (reading a serial port that's written to by an arduino) it completely messes up the stream read from arduino.
I suspect there is some problem with my approach but I couldn't figure it out...

Here is my code:

sliceWork.h

#pragma once
#include <future>
using namespace ::std;

class sliceWork
{
    int sliceIntervalMilliSeconds;
    int failureCounter;
    int maxFailsBeforeRestart;
    char* label = NULL;
    
    promise<void> workPromise;
    thread* workerThread = NULL;

    virtual void init() = 0;
    virtual bool oneSliceWork() = 0;
    void work(future<void> future);

public:
    sliceWork(int sliceInterval, int maxFails, const char* label);
    ~sliceWork();
    void initWork();
    void signalTerminate();
};

sliceWork.cpp

#include <string.h>
#include "sliceWork.h"

sliceWork::sliceWork(int interval, int maxFails, const char* workLabel)
{
    sliceIntervalMilliSeconds = interval;
    maxFailsBeforeRestart = maxFails;
    label = new char[strlen(workLabel) + 1];
    strcpy(label, workLabel);
}

sliceWork::~sliceWork()
{
    if (workerThread != NULL && workerThread->joinable())
        workerThread->join();
    printf("destructor %s\n", label);
    delete label;
    delete workerThread;
}

void sliceWork::initWork()
{
    failureCounter = 0;
    init();
    printf("Init work %s finished!\n", label);
    future<void> futureWorker = workPromise.get_future();
    workerThread = new thread(&sliceWork::work, this, move(futureWorker));
}

void sliceWork::work(future<void> future)
{
    using namespace ::std::chrono;
    steady_clock::time_point t0 = steady_clock::now();

    while (future.wait_for(chrono::milliseconds(1)) == future_status::timeout)
    {
        if (duration_cast<chrono::milliseconds>(steady_clock::now() - t0).count() 
            > sliceIntervalMilliSeconds)
        {
            if (!oneSliceWork())
            {
                if (++failureCounter > maxFailsBeforeRestart 
                    && maxFailsBeforeRestart > 0)
                {
                    init();
                    failureCounter = 0;
                }
            }
            t0 = steady_clock::now();
        }
    }
    printf("work terminated for %s!\n", label);
}

void sliceWork::signalTerminate()
{
    printf("request terminate for work %s...\n", label);
    workPromise.set_value();
}

And here is an example of using it that works as expected:

main.cpp

#include <string.h>
#include "sliceWork.h"

class A : public sliceWork
{
    void init() {
        printf("Init A...\n");
    }

    bool oneSliceWork() {
        printf("Working A...\n");
        return true;
    }
public:
    A(int slice, int max, const char* label) 
        : sliceWork(slice, max, label) 
    {
    }
};

class B : public sliceWork
{
    void init() {
        printf("Init B...\n");
    }

    bool oneSliceWork() {
        printf("Working B...\n");
        return true;
    }
public:
    B(int slice, int max, const char* label) 
        : sliceWork(slice, max, label) 
    {
    }
};

class C : public sliceWork
{
    void init() {
        printf("Init C...\n");
    }

    bool oneSliceWork() {
        printf("Working C...\n");
        return false;
    }
public:
    C(int slice, int max, const char* label) 
        : sliceWork(slice, max, label) 
    {
    }
};

int main()
{
     {
         A a(1000, 1000, "A");
         a.initWork();
         B b(2000, 1000, "B" );
         b.initWork();
         C c(700, 2, "C" );
         c.initWork();
         printf("Initializations finished!\n");
         ::std::this_thread::sleep_for(::std::chrono::seconds(7));
         a.signalTerminate();
         ::std::this_thread::sleep_for(::std::chrono::seconds(5));
         b.signalTerminate();
         ::std::this_thread::sleep_for(::std::chrono::seconds(4));
         c.signalTerminate();
     }
     getchar();
     return 0;
}

So, I want to ask if this approach is prone to error because the way I implemented the functionality.

Application is written in C++11 and targets an Raspberry PI 3b+ running the Raspberry's flavor of Debian 11 (Raspbian), if that is relevant.

ANSWER

Answered 2022-Apr-17 at 13:21

General Observations:

While the code compiles and runs on Windows 10 in Visual Studio 2019, there are multiple problems here, not necessarily with threading.

  1. Without knowing what the expected output for the test case it is very difficult to determine if the code is running correctly.
  2. Object oriented programming rules are being broken, there doesn't seem to be any encapsulation. All of the variables and methods are public.
  3. This looks more like C code that C++ code except for the classes themselves.
  4. I am providing a review to address the C++ issues, we don't debug problems on code review, and we would need to see the the Arduno code to help debug it (on Stack Overflow, not Code Review).

Avoid using namespace std;

If you are coding professionally you probably should get out of the habit of using the using namespace std; statement. The code will more clearly define where cout and other identifiers are coming from (std::cin, std::cout). As you start using namespaces in your code it is better to identify where each function comes from because there may be function name collisions from different namespaces. The identifiercout you may override within your own classes, and you may override the operator << in your own classes as well. This stack overflow question discusses this in more detail.

Never put using namespace std into a header file.

Declare Public Variables and Methods at the Top of the Class

A general best practice is to declare public variables and methods at the top of the class followed by the protected variables and methods and then finally the private variables and methods. This makes it easier for the users of the class to find the interfaces they need.

While the C++ language does provide a default for variables and methods declared at the top of the class, the code is easier to read and maintain if the public, protected and private keywords are explicit.

Prefer C++ I/O Over C Programming I/O

While C++ is backward compatible with C, using printf() in C++ is exceptionally rare, std::cin and std::cout are preferred in C++.

A Base Class Does Not Need to be an Abstract Class

You can provide default functions for the virtual methods init() and oneSliceWork(). This would reduce the repetition of code in the test case, and still allow for the virtual methods to be overwritten when necessary.

#pragma once
#include <iostream>
#include <future>

class sliceWork
{
public:
    sliceWork(int sliceInterval, int maxFails, const char* label);
    ~sliceWork();
    void initWork();
    void signalTerminate();

protected:
    virtual void init()
    {
        std::cout << "Init " << label << "..\n";
    }
    virtual bool oneSliceWork()
    {
        std::cout << "Working " << label << "..\n";
        return true;
    }
    void work(std::future<void> future);

private:
    int sliceIntervalMilliSeconds;
    int failureCounter;
    int maxFailsBeforeRestart;
    char* label = NULL;
    std::promise<void> workPromise;
    std::thread* workerThread = NULL;
};

main.cpp

#include <string.h>
#include "sliceWork.h"

class A : public sliceWork
{
public:
    A(int slice, int max, const char* label)
        : sliceWork(slice, max, label)
    {
    }
};

class B : public sliceWork
{
public:
    B(int slice, int max, const char* label)
        : sliceWork(slice, max, label)
    {
    }
};

class C : public sliceWork
{
public:
    C(int slice, int max, const char* label)
        : sliceWork(slice, max, label)
    {
    }
};

int main()
{
    {
        A a(1000, 1000, "A");
        a.initWork();
        B b(2000, 1000, "B");
        b.initWork();
        C c(700, 2, "C");
        c.initWork();
        std::cout << "Initializations finished!\n";
        ::std::this_thread::sleep_for(::std::chrono::seconds(7));
        a.signalTerminate();
        ::std::this_thread::sleep_for(::std::chrono::seconds(5));
        b.signalTerminate();
        ::std::this_thread::sleep_for(::std::chrono::seconds(4));
        c.signalTerminate();
    }
    getchar();
    return 0;
}

sliceWork.cpp

#include <string.h>
#include "sliceWork.h"

sliceWork::sliceWork(int interval, int maxFails, const char* workLabel)
{
    sliceIntervalMilliSeconds = interval;
    maxFailsBeforeRestart = maxFails;
    label = new char[strlen(workLabel) + 1];
    strcpy(label, workLabel);
}

sliceWork::~sliceWork()
{
    if (workerThread != NULL && workerThread->joinable())
        workerThread->join();
    printf("destructor %s\n", label);
    delete label;
    delete workerThread;
}

void sliceWork::initWork()
{
    failureCounter = 0;
    init();
    printf("Init work %s finished!\n", label);
    std::future<void> futureWorker = workPromise.get_future();
    workerThread = new std::thread(&sliceWork::work, this, move(futureWorker));
}

void sliceWork::work(std::future<void> future)
{
    using namespace ::std::chrono;
    steady_clock::time_point t0 = steady_clock::now();

    while (future.wait_for(std::chrono::milliseconds(1)) == std::future_status::timeout)
    {
        if (duration_cast<std::chrono::milliseconds>(steady_clock::now() - t0).count()
            > sliceIntervalMilliSeconds)
        {
            if (!oneSliceWork())
            {
                if (++failureCounter > maxFailsBeforeRestart
                    && maxFailsBeforeRestart > 0)
                {
                    init();
                    failureCounter = 0;
                }
            }
            t0 = steady_clock::now();
        }
    }
    printf("work terminated for %s!\n", label);
}

void sliceWork::signalTerminate()
{
    printf("request terminate for work %s...\n", label);
    workPromise.set_value();
}

Source https://stackoverflow.com/questions/71904521

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