add original source

source/listing_6.8.cpp

@@ -0,0 +1,15 @@
+template<typename T>
+void threadsafe_queue<T>::push(T new_value)
+{
+    std::shared_ptr<T> new_data(
+        std::make_shared<T>(std::move(new_value)));
+    std::unique_ptr<node> p(new node);
+    {
+        std::lock_guard<std::mutex> tail_lock(tail_mutex);
+        tail->data=new_data;
+        node* const new_tail=p.get();
+        tail->next=std::move(p);
+        tail=new_tail;
+    }
+    data_cond.notify_one();
+}