RtlNumberOfSetBits routine

The RtlNumberOfSetBits routine returns a count of the set bits in a given bitmap variable.

Syntax


ULONG RtlNumberOfSetBits(
  _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

RtlNumberOfSetBits returns a count of the bits that are currently set.

Remarks

Callers of RtlNumberOfSetBits 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, RtlNumberOfSetBits 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
RtlFindSetBits
RtlInitializeBitMap
RtlNumberOfClearBits

 

 

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