Updates the example servers to use #run_till_terminated
diff --git a/src/ruby/bin/interop/interop_server.rb b/src/ruby/bin/interop/interop_server.rb
index 0819ba9..72570d9 100755
--- a/src/ruby/bin/interop/interop_server.rb
+++ b/src/ruby/bin/interop/interop_server.rb
@@ -185,7 +185,7 @@
     logger.info("... running insecurely on #{host}")
   end
   s.handle(TestTarget)
-  s.run
+  s.run_till_terminated
 end
 
 main
diff --git a/src/ruby/bin/math_server.rb b/src/ruby/bin/math_server.rb
index 5cc7613..1bfe253 100755
--- a/src/ruby/bin/math_server.rb
+++ b/src/ruby/bin/math_server.rb
@@ -183,7 +183,7 @@
   end
 
   s.handle(Calculator)
-  s.run
+  s.run_till_terminated
 end
 
 main
diff --git a/src/ruby/bin/noproto_server.rb b/src/ruby/bin/noproto_server.rb
index 9979cb7..f71daea 100755
--- a/src/ruby/bin/noproto_server.rb
+++ b/src/ruby/bin/noproto_server.rb
@@ -105,7 +105,7 @@
   end
 
   s.handle(NoProto)
-  s.run
+  s.run_till_terminated
 end
 
 main