Leaked source code of windows server 2003
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#pragma warning( disable: 4001 4201 4214 4514 )
#include <windows.h> // needed for ULONG and CriticalSection support
#pragma warning( disable: 4001 4201 4214 4514 )
/////////////////////////////////////////////////////////////////////////////
// //
// randpeak.h -- Exported interface for randpeak.c //
// //
// While this header is targeted for Win32, the code //
// in randpeak.c is portable provided the following: //
// //
// ULONG is an unsigned 32-bit data type //
// and BOOL is an integral boolean type //
// //
// Two's complement wraparound (mod 2^32) //
// occurs on addition and multiplication //
// where result is greater than (2^32-1) //
// //
// If _MT or MULTITHREADED is defined, the //
// definition and support of critical //
// section primitives: //
// //
// CRITICAL_SECTION data type //
// InitializeCriticalSection function //
// EnterCriticalSection function //
// LeaveCriticalSection function //
// //
// Author: Tom McGuire (tommcg), 03/29/94 //
// //
// (C) Copyright 1994, Microsoft Corporation //
// //
/////////////////////////////////////////////////////////////////////////////
#if ( defined( _MT ) && ! defined( MULTITHREADED ))
#define MULTITHREADED 1 // compile multi-threaded support
#endif
ULONG BitReverse32( ULONG ulNumber ); // 31:0 -> 0:31
void SeedRandom32( ULONG ulSeed ); // must call first, non-reentrant
ULONG Random32( void ); // linear distribution 0<n<2^32-1
ULONG RandomInRange( ULONG ulMinInclusive, // Random32() mod Range
ULONG ulMaxInclusive );
ULONG RandomPeaked( ULONG ulMaxInclusive, ULONG ulPeakFrequency, ULONG ulPeakWidth, ULONG ulPeakDensity, ULONG ulPeakDecay );
/////////////////////////////////////////////////////////////////////////////
// //
// | Peaked Distribution | //
// |_ | //
// | \ | //
// | \ _ | //
// | \ / \ _ | //
// | \ / \ / \ _ | //
// | \ / \ / \ / \ _| //
// | \_____/ \________/ \__ __/ \____________/ | //
// |_______________________________________________________________| //
// 0 P 2P nP Max //
// //
// The center of each peak occurs at ulPeakFreq intervals starting //
// from zero, and the tops of the peaks are linear-distributed across //
// ulPeakWidth (ie, +/- ulPeakWidth/2). ulPeakDensity controls the //
// slope of the distribution off each peak with higher numbers causing //
// steeper slopes (and hence wider, lower valleys). ulPeakDecay //
// controls the declining peak-to-peak slope with higher numbers //
// causing higher peaks near zero and lower peaks toward ulMax. //
// Note that ulPeakDensity and ulPeakDecay are computationally //
// expensive with higher values (they represent internal iteration //
// counts), so moderate numbers such as 3-5 for ulPeakDensity and //
// 1-2 for ulPeakDecay are recommended. //
// //
/////////////////////////////////////////////////////////////////////////////
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