/** *************************************************************************
 **
 ** Copyright (C) 2008 Heinz van Saanen
 **
 ** This file is part of the function viewer Zhu3D.
 **
 ** This file may be used under the terms of the GNU General Public
 ** License version 3 as published by the Free Software Foundation
 ** and appearing in the file LICENSE.GPL included in the packaging of
 ** this file.
 **
 ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
 ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 **
 ****************************************************************************/

#ifndef _CPUINFO_H_
#define _CPUINFO_H_

/** Timer stuff */
#include "timers.h"
#include "tsc.h"


/** Include stuff for misc OS's */
#if defined(Q_WS_MAC)
	#include <sys/types.h>
	#include <sys/param.h>
	#include <sys/sysctl.h>

#elif defined(Q_WS_WIN)
	#include <windows.h>

#elif (defined(Q_OS_LINUX) || defined(sgi))
	#include <unistd.h>

#endif


/** Counting cores, checking frequency and endianess */
class CPUINFO {

	public:

	CPUINFO() {}
	~CPUINFO() {}

	/** Returns core-number on success, 0 otherwise */
	static int cores() {
		int tmp=0;

		/** Apple Mac OS */
		#if defined(Q_WS_MAC)
			int mib[2]={ CTL_HW, HW_NCPUINFO };
			int cpus;
			size_t size=sizeof(cpus);
			if(0==sysctl(mib, 2, &cpus, &size, NULL, 0))
				tmp=cpus;

		/** Microsoft Windows */
		#elif defined(Q_WS_WIN)
			SYSTEM_INFO si;
			GetSystemInfo(&si);
			tmp=si.dwNumberOfProcessors;

		/** Linux/Unix */
		#elif defined(Q_OS_LINUX)
			#if defined(_SC_NPROCESSORS_ONLN)
				tmp=sysconf(_SC_NPROCESSORS_ONLN);
			#endif

		/** SGI/Irix */
		#elif defined(sgi)
			#if defined(_SC_NPROC_ONLN)
				tmp=sysconf(_SC_NPROC_ONLN);
			#endif

		#endif

    	return tmp;
	}

	/** Returns frequency in MHz units. Average some 50 ms measurements */
	static double MHz() {
		double tmp=0.0;
		TIMERS tim;
		TSC tsc;

		tsc.start(); tim.uwait(50000); tmp+=tsc.stop();
		tsc.start(); tim.uwait(50000); tmp+=tsc.stop();
		tsc.start(); tim.uwait(50000); tmp+=tsc.stop();

		return (tmp*0.00002)/3.0;
	}

	/** Check out endinaness dynamically */
	static bool isBigEndian() {
        unsigned int i=1;
        unsigned char *pt = (unsigned char *) &i;
        if(pt[0])
			return false;
		return true;
	}
};


/** _CPUINFO_H_ */
#endif