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102 lines
2.0 KiB
102 lines
2.0 KiB
/*++
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Copyright (c) 1997-2000 Microsoft Corporation
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Module Name:
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memlog.c
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Abstract:
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DNS Resolver Service
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In memory logging.
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Author:
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Glenn Curtis (glennc) Feb 1998
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Revision History:
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Jim Gilroy (jamesg) March 2000 cleanup
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Jim Gilroy (jamesg) Nov 2000 create this module
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--*/
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#include "local.h"
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//
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// Memory event array
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//
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typedef struct _InMemoryEvent
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{
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DWORD Thread;
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DWORD Ticks;
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DWORD Checkpoint;
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DWORD Data;
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}
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MEM_EVENT, *PMEM_EVENT;
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#define MEM_EVENT_ARRAY_SIZE 200
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PMEM_EVENT g_pEventArray = NULL;
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LONG g_EventArrayLength = MEM_EVENT_ARRAY_SIZE;
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LONG g_EventIndex = 0;
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VOID
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LogEventInMemory(
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IN DWORD Checkpoint,
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IN DWORD Data
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)
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{
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DWORD index;
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//
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// allocate event table
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// - use interlock to insure only done once
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//
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if ( !g_pEventArray )
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{
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PMEM_EVENT ptemp = (PMEM_EVENT)
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HeapAlloc(
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GetProcessHeap(),
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HEAP_ZERO_MEMORY,
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g_EventArrayLength * sizeof(MEM_EVENT) );
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if ( !ptemp )
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{
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return;
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}
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if ( InterlockedCompareExchangePointer(
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(PVOID *) &g_pEventArray,
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ptemp,
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0) != 0 )
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{
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HeapFree(GetProcessHeap(), 0, ptemp);
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}
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}
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//
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// write event to memory
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//
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index = InterlockedIncrement( &g_EventIndex );
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index %= g_EventArrayLength;
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g_pEventArray[index].Ticks = GetTickCount();
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g_pEventArray[index].Checkpoint = Checkpoint;
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g_pEventArray[index].Thread = (short) GetCurrentThreadId();
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g_pEventArray[index].Data = Data;
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}
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//
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// memlog.c
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//
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