The list is not printing through the printList(), what i'm doing wrong here?

See my code below.

 #include <iostream>
#include <thread>
#include <list>
#include <algorithm>

using namespace std;

// a global variable
std::list<int>myList;

void addToList(int max, int interval)
{
    for (int i = 0; i < max; i++) {
        if( (i % interval) == 0) myList.push_back(i);
    }
}

void printList()
{
    for (std::list<int>::iterator itr = myList.begin(), end_itr = myList.end(); itr != end_itr; ++itr ) 
    {
        cout << *itr << ",";
    }
}

int main()
{
    int max = 100;

    std::thread t1(addToList, max, 1);
    std::thread t2(addToList, max, 10);
    std::thread t3(printList);

    t1.join();
    t2.join();
    t3.join();

    return 0;
}

Thread t3(printList)is not printing the list. Empty output is coming. Is it because t3 is executing first before inserting any item in the list? What is the reason for this?