RtlNumberOfClearBits
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RtlNumberOfClearBits routine

The RtlNumberOfClearBits routine returns a count of the clear bits in a given bitmap variable.

Syntax


ULONG RtlNumberOfClearBits(
  _In_ PRTL_BITMAP BitMapHeader
);

Parameters

BitMapHeader [in]

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

Return value

RtlNumberOfClearBits returns the number of bits that are currently clear.

Remarks

Callers of RtlNumberOfClearBits 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, RtlNumberOfClearBits 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

DLL

NtosKrnl.exe

IRQL

<= APC_LEVEL (See Remarks section)

See also

RTL_BITMAP
RtlFindClearBits
RtlFindClearRuns
RtlFindFirstRunClear
RtlFindLastBackwardRunClear
RtlFindLongestRunClear
RtlFindNextForwardRunClear
RtlInitializeBitMap
RtlNumberOfSetBits

 

 

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