add original source

source/listing_9.10.cpp

@@ -0,0 +1,9 @@
+void interruptible_wait(std::condition_variable& cv,
+                        std::unique_lock<std::mutex>& lk)
+{
+    interruption_point();
+    this_thread_interrupt_flag.set_condition_variable(cv);
+    cv.wait(lk);
+    this_thread_interrupt_flag.clear_condition_variable();
+    interruption_point();
+}