#ifndef _NTRTL_H
typedef struct _RTL_HEAP_PARAMETERS
{
ULONG Length;
SIZE_T SegmentReserve;
SIZE_T SegmentCommit;
SIZE_T DeCommitFreeBlockThreshold;
SIZE_T DeCommitTotalFreeThreshold;
SIZE_T MaximumAllocationSize;
SIZE_T VirtualMemoryThreshold;
SIZE_T InitialCommit;
SIZE_T InitialReserve;
PRTL_HEAP_COMMIT_ROUTINE CommitRoutine;
SIZE_T Reserved[2];
} RTL_HEAP_PARAMETERS, *PRTL_HEAP_PARAMETERS;
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This structure is documented in Windows Driver Kit.