RtlFindLongestRunClear - NtDoc
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#ifndef _NTRTL_H
NTSYSAPI
ULONG
NTAPI
RtlFindLongestRunClear(
_In_ PRTL_BITMAP BitMapHeader,
_Out_ PULONG StartingIndex
);
View code on GitHub// wdm.h
NTSYSAPI ULONG RtlFindLongestRunClear(
[in] PRTL_BITMAP BitMapHeader,
[out] PULONG StartingIndex
);
View the official Windows Driver Kit DDI referenceThis function is documented in Windows Driver Kit.
The RtlFindLongestRunClear routine searches for the largest contiguous range of clear bits within a given bitmap.
BitMapHeader [in]A pointer to the RTL_BITMAP structure that describes the bitmap. This structure must have been initialized by the RtlInitializeBitMap routine.
StartingIndex [out]Pointer to a variable in which the starting index of the longest clear run in the bitmap is returned. This is a zero-based value indicating the bit position of the first clear bit in the returned range.
RtlFindLongestRunClear returns either the number of bits in the run beginning at StartingIndex, or zero if it cannot find a run of clear bits within the bitmap.
A returned run can have a single clear bit.
Callers of RtlFindLongestRunClear must be running at IRQL <= APC_LEVEL if the memory that contains the bitmap variable is pageable or the memory at BitMapHeader is pageable. Otherwise, RtlFindLongestRunClear can be called at any IRQL.
RtlFindLongestRunClear