114 lines
2.4 KiB
C++
114 lines
2.4 KiB
C++
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/*++
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Copyright (c) 1995 Microsoft Corporation
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Module Name:
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Time.hxx
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Abstract:
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The CTime class represents time for this process. Instances of this class
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should be small 4-8 bytes and cheap to create.
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The current implementation is just a wrapper for GetTickCount() which
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handles overflow.
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(4GB milliseconds is just under 50 days. This implementation is correctly
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compare times up to 25 days appart.).
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Note:
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This class should return consistent results even if the system time
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is set forwards or backwards.
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(Use GetTickCount() rather then GetSystemTimeAsFileTime()).
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Author:
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Mario Goertzel [MarioGo]
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Revision History:
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MarioGo 02-23-95 Bits 'n pieces
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--*/
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#ifndef __TIME_HXX
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#define __TIME_HXX
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#define TICKS_PER_SECOND (1000) // Ticks are milliseconds
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class CTime
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{
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private:
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DWORD _Time;
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public:
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CTime() { SetNow(); }
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// Used to avoid a call to GetTickCount()
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CTime(DWORD time) : _Time(time) { }
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void
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SetNow() {
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_Time = GetTickCount();
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}
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void
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Sleep()
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{
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DWORD diff = _Time - GetTickCount();
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if ( diff > (2 * BaseTimeoutInterval) * 1000 )
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{
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// Maybe overactive under stress. We're trying to sleep until a time
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// which has already passed.
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KdPrintEx((DPFLTR_DCOMSS_ID,
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DPFLTR_INFO_LEVEL,
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"Didn't need to sleep until %d from %d\n",
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_Time,
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GetTickCount()));
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return;
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}
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SleepEx(diff, FALSE);
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}
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BOOL operator< (const CTime &Time)
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{
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// Is _Time less then Time.
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DWORD diff = _Time - Time._Time;
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return( ((LONG)diff) < 0);
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}
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BOOL operator> (const CTime &Time)
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{
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// Is _Time greater then Time.
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DWORD diff = Time._Time - _Time;
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return( ((LONG)diff) < 0);
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}
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BOOL operator<= (const CTime &Time)
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{
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return(! operator>(Time));
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}
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BOOL operator>= (const CTime &Time)
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{
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return(! operator<(Time));
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}
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void operator+=(UINT mSeconds) { _Time += (mSeconds * TICKS_PER_SECOND); }
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void operator-=(UINT mSeconds) { _Time -= (mSeconds * TICKS_PER_SECOND); }
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DWORD operator-(const CTime &Time)
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{
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return((_Time - Time._Time)/TICKS_PER_SECOND);
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}
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// defualt = operator ok.
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};
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#endif __TIME_HXX
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