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// condition_variable_any::notify_one
#include <iostream> // std::cout
#include <thread> // std::thread
#include <mutex> // std::mutex
#include <condition_variable> // std::condition_variable_any
std::mutex mtx;
std::condition_variable_any cv;
int cargo = 0; // shared value by producers and consumers
void consumer () {
mtx.lock();
while (cargo==0) cv.wait(mtx);
std::cout << cargo << '\n';
cargo=0;
mtx.unlock();
}
void producer (int id) {
mtx.lock();
cargo = id;
cv.notify_one();
mtx.unlock();
}
int main ()
{
std::thread consumers[10],producers[10];
// spawn 10 consumers and 10 producers:
for (int i=0; i<10; ++i) {
consumers[i] = std::thread(consumer);
producers[i] = std::thread(producer,i+1);
}
// join them back:
for (int i=0; i<10; ++i) {
producers[i].join();
consumers[i].join();
}
return 0;
}
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