C++ :: Cooperative Multitasking System - Single Threaded Application
Jan 19, 2013
I'm trying to get around the concept of cooperative multitasking system and exactly how it works in a single threaded application.
My understanding is that this is a "form of multitasking in which multiple tasks execute by voluntarily ceding control to other tasks at programmer-defined points within each task."
So if you have a list of tasks and one task is executing, how do you determine to pass execution to another task? And when you give execution back to a previous task, how do resume from where you were previously?
I find this a bit confusing because I don't understand how this can be achieve without a multithreaded application.
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Jan 12, 2012
I need implementing asynchronous single threaded TCP server using boost asio..
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Mar 16, 2014
I'm building a simple system management console application. I've abstracted the console "Menu" and derived from it a "WelcomeMenu" class with public inheritance.
The problem is that when instantiating a Menu* object and assigning it a new WelcomeMenu...I'm still not able to use WelcomeMenu's "ShowWelcomeMessage() with the Menu* object. Instead, I get "error: Class 'Menu' has no member function call 'ShowWelcomeMessage().' Which is true, but I thought a pointer-to-Menu object should be able to use the public methods of derived classes without casting in this case. Code follows.
// Menu and WelcomeMenu Classes
#ifndef MENU_H
#define MENU_H
#include <ctime>
#include <iostream>
#include <string>
[Code] .....
I get a compiler error when running this simple program:
#include <iostream>
#include <ctime>
#include "Utilities.h"
#include "Menu.h"
using namespace std;
[Code]....
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Nov 26, 2014
I'm trying to simulate a ctrl+ keypress into a running application.
Code:
#include <stdio.h>
int main (void) {
system("/usr/local/bin/rundb");
}
My problem is that the rundb program needs the user to type ctrl-b then s to actually start executing. What is the best way to handle this automatically? Some sort of fork/pipe?
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Apr 9, 2015
Am developing windows forms application where in my form am fetching data into list from some object which takes around 2 minutes to complete processing so meantime i want to show progress bar before starting process till it ends with percentage. I have return a code to do multitasking but it is throwing error as "Cross-thread operation not valid: Control 'listOrg' accessed from a thread other than the thread it was created on".
private void btnOrg_Click(object sender, EventArgs e) {
try {
// To report progress from the background worker we need to set this property
backgroundWorker1.WorkerReportsProgress = true;
[code]....
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Apr 15, 2013
I am using two threads and i want to take value of a function from one thread and use it in other. I am not good at the concepts of threads. Here is the following code:
Code:
void ThreadA(void const *argument){
uint32_t status = I2S002_FAIL;
status = I2S002_Config(&I2S002_Handle0, &I2SConfig_U0C1_A);
if (status != DAVEApp_SUCCESS) {
[Code] ....
So, i want to use the return value of temp_buffer from ThreadB into Thread C and want to put this value to TXBuf in ThreadA...
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Aug 25, 2014
Suppose multiple threads are are trying to insert into a STL Map, both are trying to insert with same key. As per my understanding it will not cause any issue till you invalidate the iterator. Here as per me it will not invalidate the iterator.
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Dec 15, 2014
Questions : I am running a client Server Program whose Sender and Receiver loop is given below .I have multi threaded Sender using OMP .As per My logic Receive should receive same amount of data send by Sender ,But its receiving more packet than Sender sent .I am not able to identify the Bug !!
Code:
/*
Running As Follow :
gcc UTGen.c -o Sender
gcc UTGen.c -o Receiver
./Receiver -m 0 -p 5000 -z 256 -P t
export OMP_NUM_THREADS=4
./Sender -m 1 -s localhost -p 5000 -z 256 -T 10 -P t
*/
[Code] .....
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Sep 9, 2014
// clang++ -g -std=c++11 main.cpp -pthread
#include <iostream>
#include <thread>
#include <unistd.h>
void thread1(void) {
while(1)
[code]....
Thread 1 does some background work, and thread2 is waiting for the user's input. If I join thread1 then the app can never exit. If I neither join nor detach thread1 then I get "terminate called without an active exception Aborted" which is not a good thing to have. If I do detach on thread1 does thread1 ever terminate? If not, how to terminate it? Also, how do I check if it's terminated or not?
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Sep 8, 2014
Code:
// clang++ -g -std=c++11 main.cpp -pthread
#include <iostream>
#include <thread>
#include <unistd.h>
void thread1(void) {
while(1) {
int i = 88 * 2;
[Code]...
Thread1 does some background work, and thread2 is waiting for the user's input.
If I join thread1 then the app can never exit. If I neither join nor detach thread1 then I get "terminate called without an active exception Aborted" which is not a good thing to have.
If I do detach on thread1 does thread1 ever terminate?
If not, how to terminate it?
Also, how do I check if it's terminated or not? -- I realize it's platform specific, I am on Linux.
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Oct 24, 2014
Here is the code,
Code:
void foo() {
Acquiring lock
do something...
Func();
Releasing Lock
}
If the function Func throws an exception, there is potential deadlock issue. Then I handle exception like this,
Code:
void foo() {
Acquiring lock
do something...
try{
Func();
[Code] ....
Is this a good practice? I wonder how I can apply RAII in handling exception here.
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Nov 29, 2014
What happens if I make a server application using tcp protocol and then establish connection with a client application but the server crash and then the client send data. Will the data be lost or the system will continue trying to send it?
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May 9, 2012
I want to create an application that starts an application and passes input to that application. I know how to start a process using the classes in System.Diagnostics, but I don't know how to pass data to the process.
For example, and this is just an example, I would like to be able to automatically start an application that requires a username and password and automatically enter the username and password. Of course, that might open the door to security vulnerabilities, but that's not the point of the exercise.
How to implement the functionality I described? Is there a general way to go about doing this or does it depend entirely on the idiosyncrasies of the application in question?
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Oct 4, 2012
i have task scheduling application which execute every 30 minute i want to keep this process when system is log off in c# console application
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Jan 16, 2013
i have two loops ie.
if (n==null)
{
do loop 1
}
else //(n=!null)
{
do loop2
}
now i have to update the above code, with a single loop ie. when n==null or n!=null do the loop 1
how can i update.?
can i do like this
if(n==null ||n=!null)
{
do loop 1
}
is || operator above does the job what i expected
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Sep 15, 2013
I have to make my program display days 1-30 along side numbers increasing by 5 each day beginning with 6 on the first day. I wrote 2 for loops on separate tabs but now I want to know if its possible to combine them into 1.
For loop 1
int day,;
for (day = 1; day <=30; day = day + 1)
For loop 2
int candy;
for (int candy = 6; candy <=151; candy = candy +5)
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May 20, 2013
I'm trying to create a Makefile for a single fie ( mycod.c)
What is the syntax?
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Aug 27, 2013
I am writing a program, the trouble is is that it uses a single thread and is SLOW.
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Jun 5, 2013
I have some problems with copying a single character from one char into another. How do I do that? Here is the function I am using
Code:
void
text_col (char line[]) {
char line1[1];
int l, ii;
l = strlen(line);
[Code] ....
I am trying to copy in a loop every single character from char line into char line1. That is not working.
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Mar 27, 2014
Im new to c#. In c++ I have made a window and painted it with dots and concentric circles, like a radar PPI screen. Trying to do this in c#, I can't find how to draw a single pixel on the window.
Also, what should I be drawing on: the form, panel, picturebox...?
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May 2, 2013
I'm trying to compare a single value with a value from my Linked list and if they are same, I want to add the value from the list to new list. In other words I want to create a new List with values with the first one. Here is the code that I made, but it's not working.
This is the code with which I search in the first list for a node with a value. In the main() function I have A.find_city(), so it can start from the start_pointer from the first list:
void List::find_city() {
List *temp1;
int b = 0;
char city[20];
cout << "Enter city: ";
cin >> city;
temp1 = start_ptr;
[Code] ....
This is the code with which I add a node to the new list:
void List::in(List *temp1) {
List *temp2;
if(start_ptr == NULL)
start_ptr = temp1;
[Code] ....
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Jun 7, 2013
I've got the program for the most part except one part because it's basically wanting me to return 3 values from a single function and I'm unsure how to do this the way it wants me to. The rules:
Call the user-defined function to read in x in the series to be used for calculating the results. Pass a prompt for x as an input parameter, and return the validated x value to main.
After a valid x has been entered, call the same user defined function a second time, to read in y. Pass the prompt for y as an input parameter, and return the validated number of terms value to main.
After a valid y has been entered, call the same user-defined function a third time, to read in z. Pass the prompt for z as an input parameter, and return the validated z value to main.
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Mar 22, 2014
here i have an assignment, creating a longInt class and using it to calculate large numbers, i dont have a clue how to manipulate a whole array as a single ineteger.
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Jan 26, 2014
I am making a text encrypter and I have to convert text into ASCII codes. I know how to convert a single character into ASCII -
#include <iostream>
using namespace std;
int main() {
cout<<"Text to ASCII converter"<<endl<<"Enter text to convert into ASCII - ";
char text; //defining input type, which is single character
[Code] ....
Try it here - URL.....Is there any way to run a similar program, which converts a string with spaces into ASCII code?
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Jan 6, 2015
For Example i have made a text file included some students data. Now i want to change just a single student data. That file should remain same just that student's data replace.
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Nov 4, 2013
So, I've made programs like Prime number searchers and such. But the problem is if I use an int or long int variable for the program I am limited by the variable size. I can't search through numbers larger than their memory size. So my question is: Is there a way to allocate memory to a single variable, NOT AN ARRAY, so I can make a variable as many bytes as I want?
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