How to autoschedule a thread and then stop it from main

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in c++ main i want to send start a thread at the start of the program
this thread is supposed to call a function again and again until the end of the program s reached which means when every other thing is done this thread should then be stopped only.
i need this thread to call a function recursively because i need to do something inside this function after specific time lets say after every 2 minutes i want this function to execute itself mean while other functions in main are completed sequentially.after every function completes sequentially i want the thread to stop and i can't get any logic to do that below is my code i am unable to stop the thread with std::terminate()
i think think the problem is because of infinite loop in which function is calling itself recursively
i cannot think of any logic to do that

What I have tried:

C++

#include<iostream>
#include<chrono>
#include<thread>
#include<functional>
//#include<unistd.h>
#include<Windows.h>
using namespace std;

void do_something()
{
	cout << "\ni am running after 1 minute in thread" << endl;
	int sleep_time = 1000;
	while (true)
	{
		Sleep(sleep_time);
		do_something();
	}
}
void simpleFunc()
{
	cout << "\nsimple function to check";
}
int main()
{
	cout << "\nIn main";
	//thread t1(timer_start(do_something()), 1);
	//while (true);
	thread th1(do_something);
	simpleFunc();
	cout << "\nafter the thread in main";
	Sleep(6000);
	cout << "\nafter Sleep in main";
	//th1.detach();
	//th1.detach();
	//th1.join();
	std::terminate();
	return 0;
	//std::terminate();
	//system("pause");
	//return 0;
}

Posted 26-Feb-20 22:36pm

Member 12899279

Updated 27-Feb-20 0:07am

CPallini

v2

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Comments

Richard MacCutchan 27-Feb-20 5:11am

That thread will run recursively for ever; what exactly are you trying to achieve with this code?

Member 12899279 27-Feb-20 5:18am

i know but there's something inside that function which i need to run after set interval of time lets say 5 minutes
i need this function to call itself again and again after 5minutes thats why i have dedicated a separate thread for it because i want it to run seprately from the other sequential code in my main()
i need this thread to stop and concurrently this function from executing too as soon as all the other sequential code is finished executing in the main and in main i am on return 0

Richard MacCutchan 27-Feb-20 5:55am

You need to kill the thread from main, or use a flag that main sets to indicate that the thread should terminate.

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Member 12899279 · Answer 1 · 2020-02-27T00:02:00

it was very simple and easy i don't know why this thought didn't enter in my mind to simply use a bool flag i guess i was overthinking on a very simple task anyhow below is the code

using namespace std;
bool stop_thread_1 = false;

void do_something(/*int i*/)
{
	int sleep_time = 1000;

	/*int count = i*/;
	while (stop_thread_1==false)
	{
		cout << "\ni am running after 1 minute in thread" << endl;

		Sleep(sleep_time);
	
	}
}
void simpleFunc()
{
	cout << "\nsimple function to check";
}
int main()
{
	cout << "\nIn main";
	thread th1(do_something);
	simpleFunc();
	cout << "\nafter the thread in main";
	Sleep(6000);
	cout << "\nafter Sleep in main";

	stop_thread_1 = true;
	th1.join();
	
	system("pause");
	exit(0);
	
}

CPallini · Answer 2 · 2020-02-27T00:08:00

I suppose you can rearrange your approach, avoiding recursion. The following program

C++

#include <iostream>
#include <chrono>
#include <thread>
#include <atomic>
using namespace std;
using namespace std::chrono_literals;

void do_something()
{
  cout << "do something..." << endl;
}

void control_thread(std::atomic<bool> & stop)
{
  while (!stop)
  {
    this_thread::sleep_for(1s);
    do_something();
  }
}

int main()
{
  std::atomic<bool> stop{false};

  thread ct(control_thread, ref(stop));

  for (size_t n = 0; n<10; ++n)
  {
    cout << "main thread, iteration " << n << ", sleeping..." << endl;;
    this_thread::sleep_for(2.5s);
  }

  stop = true;
  cout << "wating for the thread to join..." << endl;
  ct.join();

  cout << "finished" << endl;
}

produces

main thread, iteration 0, sleeping...
do something...
do something...
main thread, iteration 1, sleeping...
do something...
do something...
main thread, iteration 2, sleeping...
do something...
do something...
do something...
main thread, iteration 3, sleeping...
do something...
do something...
main thread, iteration 4, sleeping...
do something...
do something...
do something...
main thread, iteration 5, sleeping...
do something...
do something...
main thread, iteration 6, sleeping...
do something...
do something...
do something...
main thread, iteration 7, sleeping...
do something...
do something...
main thread, iteration 8, sleeping...
do something...
do something...
do something...
main thread, iteration 9, sleeping...
do something...
do something...
wating for the thread to join...
do something...
finished

How to autoschedule a thread and then stop it from main

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