1 files changed, 60 insertions, 0 deletions
diff --git a/include/distortos/OnceFlag.hpp b/include/distortos/OnceFlag.hpp
new file mode 100644
index 0000000..0ac6185
--- /dev/null
+++ b/include/distortos/OnceFlag.hpp
@@ -0,0 +1,60 @@
+/**
+ * \file
+ * \brief OnceFlag class header
+ *
+ * \author Copyright (C) 2015 Kamil Szczygiel http://www.distortec.com http://www.freddiechopin.info
+ *
+ * \par License
+ * This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0. If a copy of the MPL was not
+ * distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#ifndef INCLUDE_DISTORTOS_ONCEFLAG_HPP_
+#define INCLUDE_DISTORTOS_ONCEFLAG_HPP_
+
+#include "distortos/internal/synchronization/CallOnceControlBlock.hpp"
+
+#if DISTORTOS_CALLONCE_SUPPORTED == 1 || DOXYGEN == 1
+
+namespace distortos
+{
+
+/**
+ * \brief OnceFlag is a helper class for callOnce().
+ *
+ * Similar to std::once_flag - http://en.cppreference.com/w/cpp/thread/once_flag
+ * Similar to POSIX pthread_once_t - http://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_once.html#
+ *
+ * \note This class requires GCC 4.9.
+ *
+ * \ingroup synchronization
+ */
+
+class OnceFlag
+{
+	template<typename Function, typename... Args>
+	friend void callOnce(OnceFlag& onceFlag, Function&& function, Args&&... args);
+
+public:
+
+	/**
+	 * \brief OnceFlag's constructor
+	 */
+
+	constexpr OnceFlag() :
+			callOnceControlBlock_{}
+	{
+
+	}
+
+private:
+
+	/// internal internal::CallOnceControlBlock object used by callOnce()
+	internal::CallOnceControlBlock callOnceControlBlock_;
+};
+
+}	// namespace distortos
+
+#endif	// DISTORTOS_CALLONCE_SUPPORTED == 1 || DOXYGEN == 1
+
+#endif	// INCLUDE_DISTORTOS_ONCEFLAG_HPP_