How to restart a thread if it throws an exception

I have two threads, one of them may throw an exception, I want to make the thread restart if it throws an exception. Here is my code:

#include <iostream>
#include <future>
#include <chrono>


void func1()
{
    int i = 0;
    while (true)
    {
        std::this_thread::sleep_for(std::chrono::milliseconds(2000));
        std::cout<<"func1"<<std::endl;
        if (i++ == 3)
        {
            throw 2;
        }
    }
}

void func2()
{
    while (true)
    {
        std::this_thread::sleep_for(std::chrono::milliseconds(2000));
        std::cout<<"func2"<<std::endl;
    }
}

int main()
{
    std::future<void> res(std::async(std::launch::async, func1));
    std::future<void> res2(std::async(std::launch::async, func2));
    try{
    res.get();
    res2.get();
    }catch(int e){}
    return 0;
}

When res.get() throws the exception, res2 is stilling running, in this case, how could I make the res to restart?

Another thing is, if I first res2.get() then res.get(), the exception of res will be thrown but will be never caught, in this case, how could I handle the res? It doesn't seem that I can touch and control it anymore unless the res2.get() returns.