C++11 std::threads not exiting - c++11

Question

Could you please check the following code which is not exiting even after condition becomes false?
I'm trying to print numbers from 1 to 10 by first thread, 2 to 20 by second thread likewise & I have 10 threads, whenever count reaches to 100, my program should terminate safely by terminating all threads. But that is not happening, after printing, it stuck up and I don't understand why?
Is there any data race? Please guide.
#include<iostream>
#include<vector>
#include<thread>
#include<mutex>
#include<condition_variable>
std::mutex mu;
int count=1;
bool isDone = true;
std::condition_variable cv;
void Print10(int tid)
{
std::unique_lock<std::mutex> lock(mu);
while(isDone){
cv.wait(lock,[tid](){ return ((count/10)==tid);});
for(int i=0;i<10;i++)
std::cout<<"tid="<<tid<<" count="<<count++<<"\n";
isDone = count<100;//!(count == (((tid+1)*10)+1));
std::cout<<"tid="<<tid<<" isDone="<<isDone<<"\n";
cv.notify_all();
}
}
int main()
{
std::vector<std::thread> vec;
for(int i=0;i<10;i++)
{
vec.push_back(std::thread(Print10,i));
}
for(auto &th : vec)
{
if(th.joinable())
th.join();
}
}

Answer 1

I believe the following code should work for you
#include<iostream>
#include<vector>
#include<thread>
#include<mutex>
#include<condition_variable>
using namespace std;
mutex mu;
int count=1;
bool isDone = true;
condition_variable cv;
void Print10(int tid)
{
unique_lock<std::mutex> lock(mu);
// Wait until condition --> Wait till count/10 = tid
while(count/10 != tid)
cv.wait(lock);
// Core logic
for(int i=0;i<10;i++)
cout<<"tid="<<tid<<" count="<<count++<<"\n";
// Release the current thread thus ensuring serailization
cv.notify_one();
}
int main()
{
std::vector<std::thread> vec;
for(int i=0;i<10;i++)
{
vec.push_back(std::thread(Print10,i));
}
for(auto &th : vec)
{
if(th.joinable())
th.join();
}
return 0;
}