From 92235fb259b0ebdfc99859c2c95fe1f8c163f411 Mon Sep 17 00:00:00 2001
From: Clyne Sullivan <tullivan99@gmail.com>
Date: Tue, 8 Nov 2016 20:09:05 -0500
Subject: trying out distortos

---
 include/distortos/callOnce.hpp | 50 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)
 create mode 100644 include/distortos/callOnce.hpp

(limited to 'include/distortos/callOnce.hpp')

diff --git a/include/distortos/callOnce.hpp b/include/distortos/callOnce.hpp
new file mode 100644
index 0000000..ed1cd1d
--- /dev/null
+++ b/include/distortos/callOnce.hpp
@@ -0,0 +1,50 @@
+/**
+ * \file
+ * \brief callOnce() 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_CALLONCE_HPP_
+#define INCLUDE_DISTORTOS_CALLONCE_HPP_
+
+#include "distortos/OnceFlag.hpp"
+
+#if DISTORTOS_CALLONCE_SUPPORTED == 1 || DOXYGEN == 1
+
+namespace distortos
+{
+
+/**
+ * \brief Executes the callable object exactly once, even if called from multiple threads.
+ *
+ * Similar to std::call_once() - http://en.cppreference.com/w/cpp/thread/call_once
+ * Similar to POSIX pthread_once() - http://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_once.html#
+ *
+ * \note This function requires GCC 4.9.
+ *
+ * \tparam Function is the function object that will be executed
+ * \tparam Args are the arguments for \a Function
+ *
+ * \param [in] onceFlag is a reference to shared OnceFlag object
+ * \param [in] function is the function object that will be executed
+ * \param [in] args are arguments for \a function
+ *
+ * \ingroup synchronization
+ */
+
+template<typename Function, typename... Args>
+void callOnce(OnceFlag& onceFlag, Function&& function, Args&&... args)
+{
+	onceFlag.callOnceControlBlock_(std::forward<Function>(function), std::forward<Args>(args)...);
+}
+
+}	// namespace distortos
+
+#endif	// DISTORTOS_CALLONCE_SUPPORTED == 1 || DOXYGEN == 1
+
+#endif	// INCLUDE_DISTORTOS_CALLONCE_HPP_
-- 
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