conditional variables c++ code example
Example: conditional variables code in c++
#include <iostream>
#include <thread>
#include <mutex>
#include <condition_variable>
std::mutex mtx;
std::condition_variable cv;
bool ready = false;
void print_id (int id) {
std::unique_lock<std::mutex> lck(mtx);
while (!ready) cv.wait(lck);
std::cout << "thread " << id << '\n';
}
void go() {
std::unique_lock<std::mutex> lck(mtx);
ready = true;
cv.notify_all();
}
int main ()
{
std::thread threads[10];
for (int i=0; i<10; ++i)
threads[i] = std::thread(print_id,i);
std::cout << "10 threads ready to race...\n";
go();
for (auto& th : threads) th.join();
return 0;
}