C++多线程编程和同步机制实例演示

#include <thread>
#include <iostream>
int main() {
    std::thread t([](){
        std::cout << "Hello from thread " << std::this_thread::get_id() << std::endl;
    });
    t.join();
    return 0;
}

#include <thread>
#include <mutex>
#include <iostream>
std::mutex mtx;
void thread_func() {
    mtx.lock();
    std::cout << "Hello from thread " << std::this_thread::get_id() << std::endl;
    mtx.unlock();
}
int main() {
    std::thread t1(thread_func);
    std::thread t2(thread_func);
    t1.join();
    t2.join();
    return 0;
}

#include <thread>
#include <mutex>
#include <condition_variable>
#include <iostream>
std::mutex mtx;
std::condition_variable cv;
bool ready = false;
void consumer() {
    std::unique_lock<std::mutex> lock(mtx);
    cv.wait(lock, [](){ return ready; });
    std::cout << "Hello from consumer thread " << std::this_thread::get_id() << std::endl;
}
void producer() {
    std::this_thread::sleep_for(std::chrono::seconds(1));
    ready = true;
    cv.notify_one();
}
int main() {
    std::thread t1(consumer);
    std::thread t2(producer);
    t1.join();
    t2.join();
    return 0;
}