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// unique_lock::lock/unlock
#include <iostream> // std::cout
#include <thread> // std::thread
#include <mutex> // std::mutex, std::unique_lock, std::defer_lock
std::mutex mtx; // mutex for critical section
void print_thread_id (int id) {
std::unique_lock<std::mutex> lck (mtx,std::defer_lock);
// critical section (exclusive access to std::cout signaled by locking lck):
lck.lock();
std::cout << "thread #" << id << '\n';
lck.unlock();
}
int main ()
{
std::thread threads[10];
// spawn 10 threads:
for (int i=0; i<10; ++i)
threads[i] = std::thread(print_thread_id,i+1);
for (auto& th : threads) th.join();
return 0;
}
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