CPP
cpp
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#include <iostream>
using namespace std;
#include <shared_mutex>
#include <thread>
shared_mutex m;
int data1 = 0;
void write()
{
lock_guard<shared_mutex> lg(m);
cout << data1 << endl;
}
void read()
{
shared_lock<shared_mutex> lg(m);
++data1;
}
int main()
{
auto t1 = thread(read);
auto t2 = thread(write);
auto t3 = thread(read);
auto t4 = thread(read);
t1.join();
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OUTPUT
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