Add a test.

diff --git a/tests/base/task_group_size.cc b/tests/base/task_group_size.cc
new file mode 100644 (file)
index 0000000..e038671
--- /dev/null
+++ b/tests/base/task_group_size.cc
@@ -0,0 +1,46 @@
+// ---------------------------------------------------------------------
+//
+// Copyright (C) 2009 - 2018 by the deal.II authors
+//
+// This file is part of the deal.II library.
+//
+// The deal.II library is free software; you can use it, redistribute
+// it, and/or modify it under the terms of the GNU Lesser General
+// Public License as published by the Free Software Foundation; either
+// version 2.1 of the License, or (at your option) any later version.
+// The full text of the license can be found in the file LICENSE.md at
+// the top level directory of deal.II.
+//
+// ---------------------------------------------------------------------
+
+
+// verify that TaskGroup::size() does what we want
+
+#include <deal.II/base/thread_management.h>
+
+#include "../tests.h"
+
+
+void
+test(int i)
+{
+  std::this_thread::sleep_for(std::chrono::seconds(1));
+}
+
+
+
+int
+main()
+{
+  initlog();
+
+  Threads::TaskGroup<> tg;
+  tg += Threads::new_task(test, 1);
+  deallog << tg.size() << std::endl;
+
+  tg += Threads::new_task(test, 2);
+  deallog << tg.size() << std::endl;
+
+  tg.join_all();
+  deallog << tg.size() << std::endl;
+}

diff --git a/tests/base/task_group_size.with_threads=on.output b/tests/base/task_group_size.with_threads=on.output
new file mode 100644 (file)
index 0000000..79df992
--- /dev/null
+++ b/tests/base/task_group_size.with_threads=on.output
@@ -0,0 +1,4 @@
+
+DEAL::1
+DEAL::2
+DEAL::2