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RtlClearBit routine

The RtlClearBit routine sets the specified bit in a bitmap to zero.

Syntax


VOID RtlClearBit(
  _In_  PRTL_BITMAP BitMapHeader,
  _In_  ULONG BitNumber
);

Parameters

BitMapHeader [in]

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

BitNumber [in]

Specifies the zero-based index of the bit within the bitmap. The routine sets this bit to zero.

Return value

None

Remarks

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

Requirements

Version

Available in Windows XP and later versions of Windows.

Header

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

Library

Ntoskrnl.lib

IRQL

<= APC_LEVEL (See Remarks section)

See also

RTL_BITMAP
RtlInitializeBitMap

 

 

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