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RtlAreBitsClear routine

The RtlAreBitsClear routine determines whether a given range of bits within a bitmap variable is clear.

Syntax


BOOLEAN RtlAreBitsClear(
  _In_ PRTL_BITMAP BitMapHeader,
  _In_ ULONG       StartingIndex,
  _In_ ULONG       Length
);

Parameters

BitMapHeader [in]

A pointer to the RTL_BITMAP structure that describes the bitmap. This structure must have been initialized by the RtlInitializeBitMap routine.

StartingIndex [in]

Specifies the start of the bit range to be tested. This is a zero-based value indicating the position of the first bit in the range.

Length [in]

Specifies how many bits to test.

Return value

RtlAreBitsClear returns TRUE if Length consecutive bits beginning at StartingIndex are clear (that is, all the bits from StartingIndex to (StartingIndex + Length) -1). It returns FALSE if any bit in the given range is set, if the given range is not a proper subset of the bitmap, or if the given Length is zero.

Remarks

Callers of RtlAreBitsClear 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, RtlAreBitsClear can be called at any IRQL.

Requirements

Target platform

Universal

Version

Available starting with Windows 2000.

Header

Wdm.h (include Wdm.h, Ntddk.h, or Ntifs.h)

Library

Ntoskrnl.lib

IRQL

<= APC_LEVEL (See Remarks section)

See also

RtlAreBitsSet
RTL_BITMAP
RtlCheckBit
RtlClearAllBits
RtlFindClearBits
RtlFindFirstRunClear
RtlFindLastBackwardRunClear
RtlFindLongestRunClear
RtlFindNextForwardRunClear
RtlInitializeBitMap

 

 

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