Init

DependentExtensions/cat/time/Clock.hpp

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+/*
+	Copyright (c) 2009-2010 Christopher A. Taylor.  All rights reserved.
+
+	Redistribution and use in source and binary forms, with or without
+	modification, are permitted provided that the following conditions are met:
+
+	* Redistributions of source code must retain the above copyright notice,
+	  this list of conditions and the following disclaimer.
+	* Redistributions in binary form must reproduce the above copyright notice,
+	  this list of conditions and the following disclaimer in the documentation
+	  and/or other materials provided with the distribution.
+	* Neither the name of LibCat nor the names of its contributors may be used
+	  to endorse or promote products derived from this software without
+	  specific prior written permission.
+
+	THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+	AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+	IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+	ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+	LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+	CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+	SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+	INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+	CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+	ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+	POSSIBILITY OF SUCH DAMAGE.
+*/
+
+#ifndef CAT_CLOCK_HPP
+#define CAT_CLOCK_HPP
+
+#include <cat/Platform.hpp>
+#include <string>
+#include <cat/threads/Mutex.hpp>
+
+namespace cat {
+
+
+class Clock
+{
+#ifdef CAT_OS_WINDOWS
+	static Mutex init_lock;
+	static u32 initialized; // Number of times initialized
+    static u32 period; // timegettime() and Windows scheduler period
+	static double inv_freq; // Performance counter frequency (does not change, so cache it)
+#endif
+
+public:
+	static bool Initialize();
+	static bool Shutdown();
+
+    static u32 sec();     // timestamp in seconds
+    static u32 msec_fast(); // timestamp in milliseconds, less accurate than msec() but faster
+    static u32 msec();    // timestamp in milliseconds, must call Initialize() first
+	static double usec(); // timestamp in microseconds, must call Initialize() first
+	static u32 cycles();  // timestamp in cycles
+
+    static std::string format(const char *format_string);
+
+    static void sleep(u32 milliseconds);
+
+    static bool SetHighPriority();
+    static bool SetNormalPriority();
+
+    static u32 MeasureClocks(int iterations, void (*FunctionPtr)());
+};
+
+
+} // namespace cat
+
+#endif // CAT_CLOCK_HPP