Add UptimeTimer class

modules/ripple_basics/events/ripple_UptimeTimer.cpp

@@ -0,0 +1,66 @@
+//------------------------------------------------------------------------------
+/*
+	Copyright (c) 2011-2013, OpenCoin, Inc.
+
+	Permission to use, copy, modify, and/or distribute this software for any
+	purpose with  or without fee is hereby granted,  provided that the above
+	copyright notice and this permission notice appear in all copies.
+
+	THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+	WITH  REGARD  TO  THIS  SOFTWARE  INCLUDING  ALL  IMPLIED  WARRANTIES OF
+	MERCHANTABILITY  AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+	ANY SPECIAL,  DIRECT, INDIRECT,  OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+	WHATSOEVER  RESULTING  FROM LOSS OF USE, DATA OR PROFITS,  WHETHER IN AN
+	ACTION OF CONTRACT, NEGLIGENCE  OR OTHER TORTIOUS ACTION, ARISING OUT OF
+	OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+//==============================================================================
+
+UptimeTimer::UptimeTimer ()
+	: m_shadowPointer (0)
+	, m_startTime (::time (0))
+{
+}
+
+UptimeTimer::~UptimeTimer ()
+{
+}
+
+void UptimeTimer::initializeShadowPointerIfNecessary (int* shadowPointer)
+{
+	if (m_shadowPointer == 0)
+	{
+		m_shadowPointer = static_cast <int volatile*> (shadowPointer);
+	}
+
+}
+
+void UptimeTimer::resetShadowPointerIfSet (int* shadowPointer)
+{
+	if (m_shadowPointer == shadowPointer)
+	{
+		m_shadowPointer = 0;
+	}
+}
+
+int UptimeTimer::getElapsedSeconds ()
+{
+	int result;
+
+	if (m_shadowPointer != 0)
+	{
+		result = *m_shadowPointer;
+	}
+	else
+	{
+		result = static_cast <int> (::time (0) - m_startTime);
+	}
+
+	return result;
+}
+
+UptimeTimer& UptimeTimer::getInstance ()
+{
+	static UptimeTimer instance;
+	return instance;
+}