add original source

source/listing_5.9.cpp

@@ -0,0 +1,42 @@
+#include <atomic>
+#include <thread>
+#include <assert.h>
+
+std::atomic<int> data[5];
+std::atomic<bool> sync1(false),sync2(false);
+
+void thread_1()
+{
+    data[0].store(42,std::memory_order_relaxed);
+    data[1].store(97,std::memory_order_relaxed);
+    data[2].store(17,std::memory_order_relaxed);
+    data[3].store(-141,std::memory_order_relaxed);
+    data[4].store(2003,std::memory_order_relaxed);
+    sync1.store(true,std::memory_order_release);
+}
+
+void thread_2()
+{
+    while(!sync1.load(std::memory_order_acquire));
+    sync2.store(std::memory_order_release);
+}
+
+void thread_3()
+{
+    while(!sync2.load(std::memory_order_acquire));
+    assert(data[0].load(std::memory_order_relaxed)==42);
+    assert(data[1].load(std::memory_order_relaxed)==97);
+    assert(data[2].load(std::memory_order_relaxed)==17);
+    assert(data[3].load(std::memory_order_relaxed)==-141);
+    assert(data[4].load(std::memory_order_relaxed)==2003);
+}
+
+int main()
+{
+    std::thread t1(thread_1);
+    std::thread t2(thread_2);
+    std::thread t3(thread_3);
+    t1.join();
+    t2.join();
+    t3.join();
+}