std::cout <<"Do Some Handshaking"<< std::endl;std::unique_lock<std::mutex>mlock(m_mutex);// 开始等待条件变量收到信号,wait()将在内部释放锁并使线程阻塞,一旦条件变量得到信号,就恢复线程并再次获得锁。// 然后检查是否满足条件,如果条件满足,则继续,否则继续等待。m_condVar.wait(mlock, std::bind...
voidcount_down(std::ptrdiff_tn =1);booltry_wait()constnoexcept;voidwait()const;voidarrive_and_wait(std::ptrdiff_tn =1); count_down是将计数器减少n但是不等待,如果n大于内部的计数器,则行为未定义; try_wait测试是否需要等待; wait等待计数器减到0; arrive_and_wait等于先count_down后wait。 barrier...
ready) { // wait until main() sets ready... std::this_thread::yield(); } for (volatile int i = 0; i<1000000; ++i) {} std::cout << id; } int main() { std::thread threads[10]; std::cout << "race of 10 threads that count to 1 million:\n"; for (int i = 0; ...
cv.wait(lock) ; 的作用是阻塞当前线程,直到收到可以继续执行的通知。在调用 cv.wait() 时,你必须传入一个已锁定的 std::unique_lock。当线程等待时,该锁会被释放,允许其他线程锁定相同的互斥体。当线程被唤醒时,它会自动重新获得锁。 cv.wait(lock, []() { return ready; }); 这会导致线程在收到通知...
cond.wait(lock); } data = m_queue.front(); m_queue.pop(); return 0; } 1. 2. 3. 4. 5. 6. 7. 8. 9. 需要注意的是,while(m_queue.empty)这一部分,在cppreference.com中也有明确的说明,条件变量可能存在虚假的唤醒,所以需要检查是否满足条件。当然,...
wait(uni_m, [=] { return flag != 1; }); cout << "Thread ID: " << std::this_thread::get_id() << endl; return; } int main() { std::mutex cv_mutex; std::condition_variable cv; int flag = 0; std::thread t1(&PrintID_CV, ref(cv_mutex), ref(cv), flag); while (...
// this_thread::yield example #include <iostream> // std::cout #include <thread> // std::thread, std::this_thread::yield #include <atomic> // std::atomic std::atomic<bool> ready(false); void count1m(int id) { while (!ready) { // wait until main() sets ready... std::this...
(int argc, const char *argv[]) { std::thread threads[5]; std::cout << "Spawning 5 threads...\n"; for (int i = 0; i < 5; i++) { threads[i] = std::thread(thread_task, i + 1); } std::cout << "Done spawning threads! Now wait for them to join\n"; for (auto& ...
wait(lock, []{ return stopFlag.load(); }); if (stopFlag.load()) { break; } // 执行线程的主要工作 std::cout << "Thread is running..." << std::endl; std::this_thread::sleep_for(std::chrono::seconds(1)); } std::cout << "Thread is stopping..." ...
std::cout<<"Done spawning threads! Now wait for them to join\n"; for(auto&t:threads) { t.join(); } std::cout<<"All threads joined.\n"; returnEXIT_SUCCESS; } 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. ...