add original source

source/listing_5.11.cpp

@@ -0,0 +1,41 @@
+#include <atomic>
+#include <thread>
+
+std::vector<int> queue_data;
+std::atomic<int> count;
+
+void populate_queue()
+{
+    unsigned const number_of_items=20;
+    queue_data.clear();
+    for(unsigned i=0;i<number_of_items;++i)
+    {
+        queue_data.push_back(i);
+    }
+    
+    count.store(number_of_items,std::memory_order_release);
+}
+
+void consume_queue_items()
+{
+    while(true)
+    {
+        int item_index;
+        if((item_index=count.fetch_sub(1,std::memory_order_acquire))<=0)
+        {
+            wait_for_more_items();
+            continue;
+        }
+        process(queue_data[item_index-1]);
+    }
+}
+
+int main()
+{
+    std::thread a(populate_queue);
+    std::thread b(consume_queue_items);
+    std::thread c(consume_queue_items);
+    a.join();
+    b.join();
+    c.join();
+}