prepare for c++17

code/7/7.1.cpp

@@ -0,0 +1,36 @@
+//
+// 7.1.cpp
+// c++1x tutorial
+//
+// created by changkun at shiyanlou.com
+//
+// 线程支持库
+
+#include <iostream>
+#include <future>
+#include <thread>
+void foo() {
+    std::cout << "hello world" << std::endl;
+}
+
+void foo2() {
+    // 将一个返回值为7的 lambda 表达式封装到 task 中
+    // std::packaged_task 的模板参数为要封装函数的类型
+    std::packaged_task<int()> task([](){return 7;});
+    // 获得 task 的 future
+    std::future<int> result = task.get_future();    // 在一个线程中执行 task
+    std::thread(std::move(task)).detach();    std::cout << "Waiting...";
+    result.wait();
+    // 输出执行结果
+    std::cout << "Done!" << std:: endl << "Result is " << result.get() << '\n';
+}
+
+int main() {
+    std::thread t(foo);
+    
+    foo2();
+    
+    t.join();
+    
+    return 0;
+}

code/7/7.2.cpp

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+//
+// 7.2.cpp
+// c++1x tutorial
+//
+// created by changkun at shiyanlou.com
+//
+// 生产者消费者模型
+
+#include <condition_variable>
+#include <mutex>
+#include <thread>
+#include <iostream>
+#include <queue>
+#include <chrono>
+
+int main()
+{
+    // 生产者数量
+    std::queue<int> produced_nums;
+    // 互斥锁
+    std::mutex m;
+    // 条件变量
+    std::condition_variable cond_var;
+    // 结束标志
+    bool done = false;
+    // 通知标志
+    bool notified = false;
+    
+    // 生产者线程
+    std::thread producer([&]() {
+        for (int i = 0; i < 5; ++i) {
+            std::this_thread::sleep_for(std::chrono::seconds(1));
+            // 创建互斥锁
+            std::unique_lock<std::mutex> lock(m);
+            std::cout << "producing " << i << '\n';
+            produced_nums.push(i);
+            notified = true;
+            // 通知一个线程
+            cond_var.notify_one();
+        }
+        done = true;
+        cond_var.notify_one();
+    });
+    // 消费者线程
+    std::thread consumer([&]() {
+        std::unique_lock<std::mutex> lock(m);
+        while (!done) {
+            while (!notified) {  // 循环避免虚假唤醒
+                cond_var.wait(lock);
+            }
+            while (!produced_nums.empty()) {
+                std::cout << "consuming " << produced_nums.front() << '\n';
+                produced_nums.pop();
+            }
+            notified = false;
+        }
+    });
+    
+    producer.join();
+    consumer.join();
+}