1 files changed, 39 insertions, 0 deletions
diff --git a/src/boost/libs/thread/example/once.cpp b/src/boost/libs/thread/example/once.cpp
new file mode 100644
index 000000000..c063a9ce4
--- /dev/null
+++ b/src/boost/libs/thread/example/once.cpp
@@ -0,0 +1,39 @@
+// Copyright (C) 2001-2003
+// William E. Kempf
+//
+//  Distributed under the Boost Software License, Version 1.0. (See accompanying
+//  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+#define BOOST_THREAD_PROVIDES_ONCE_CXX11
+
+#include <boost/thread/thread.hpp>
+#include <boost/thread/once.hpp>
+#include <cassert>
+
+int value=0;
+#ifdef BOOST_THREAD_PROVIDES_ONCE_CXX11
+static boost::once_flag once;
+//static boost::once_flag once2 = BOOST_ONCE_INIT;
+#else
+static boost::once_flag once = BOOST_ONCE_INIT;
+//static boost::once_flag once2 = once;
+#endif
+
+void init()
+{
+    ++value;
+}
+
+void thread_proc()
+{
+    boost::call_once(&init, once);
+}
+
+int main()
+{
+    boost::thread_group threads;
+    for (int i=0; i<5; ++i)
+        threads.create_thread(&thread_proc);
+    threads.join_all();
+    assert(value == 1);
+}