IOBufferMemoryDescriptor class

E771036

I/O Kit C++ class memory descriptor class

The IOBufferMemoryDescriptor class is an I/O Kit C++ class in macOS used to manage and describe pageable or non-pageable memory buffers for device drivers.

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All labels observed (2)

Label	Occurrences
IOBufferMemoryDescriptor class canonical	1
IOBufferMemoryDescriptor.h	1

How this entity was disambiguated

This entity first appeared as the object of triple T9002777 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.

NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07

Target entity: IOBufferMemoryDescriptor class
Context triple: [I/O Kit, includes, IOBufferMemoryDescriptor class]

A. System.IO.BufferedStream
System.IO.BufferedStream is a .NET stream wrapper that adds an in-memory buffer to another stream to improve read and write performance.
B. I/O Memory Management Unit
An I/O Memory Management Unit (IOMMU) is a hardware component that maps device-visible virtual addresses to physical memory addresses, enabling secure and efficient direct memory access (DMA) and device isolation.
C. PreAllocatedOverlapped
PreAllocatedOverlapped is a .NET threading helper class that allows you to pre-allocate and reuse native overlapped I/O structures to reduce garbage collection overhead in asynchronous operations.
D. ByteLengthQueuingStrategy
ByteLengthQueuingStrategy is a built-in queuing strategy in the JavaScript Streams API that manages backpressure by estimating chunk sizes in bytes rather than by count.
E. Memory Manager
Memory Manager is a classic Macintosh system software component responsible for allocating, tracking, and organizing application and system memory.
F. None of above. chosen
G. Unsure - the case is ambiguous/there is not enough information to decide.

NED2 Entity disambiguation (via description) gpt-5-mini-2025-08-07

Target entity: IOBufferMemoryDescriptor class
Target entity description: The IOBufferMemoryDescriptor class is an I/O Kit C++ class in macOS used to manage and describe pageable or non-pageable memory buffers for device drivers.

A. System.IO.BufferedStream
System.IO.BufferedStream is a .NET stream wrapper that adds an in-memory buffer to another stream to improve read and write performance.
B. I/O Memory Management Unit
An I/O Memory Management Unit (IOMMU) is a hardware component that maps device-visible virtual addresses to physical memory addresses, enabling secure and efficient direct memory access (DMA) and device isolation.
C. PreAllocatedOverlapped
PreAllocatedOverlapped is a .NET threading helper class that allows you to pre-allocate and reuse native overlapped I/O structures to reduce garbage collection overhead in asynchronous operations.
D. ByteLengthQueuingStrategy
ByteLengthQueuingStrategy is a built-in queuing strategy in the JavaScript Streams API that manages backpressure by estimating chunk sizes in bytes rather than by count.
E. Memory Manager
Memory Manager is a classic Macintosh system software component responsible for allocating, tracking, and organizing application and system memory.
F. None of above. chosen

Statements (48)

Predicate	Object
instanceOf	I/O Kit C++ class ⓘ memory descriptor class ⓘ
belongsTo	Apple I/O Kit driver model ⓘ
canBe	unwired ⓘ wired ⓘ
conformsTo	OSObject interface ⓘ
declaredIn	IOKit ⓘ linked to: I/O Kit
definedIn	macOS ⓘ
documentationURL	https://developer.apple.com/documentation/kernel/iobuffermemorydescriptor ⓘ
framework	Kernel framework ⓘ
hasProperty	capacity in bytes ⓘ contiguous allocation option ⓘ direction of I/O ⓘ options bitmask ⓘ page-aligned allocation option ⓘ
headerFile	IOBufferMemoryDescriptor.h ⓘ linked to: IOBufferMemoryDescriptor class
lifetime	managed by reference counting ⓘ
mapsTo	kernel virtual address space ⓘ user space (optionally) ⓘ
memoryManagementModel	OSObject reference counting ⓘ
partOf	I/O Kit ⓘ
platform	Darwin ⓘ macOS kernel ⓘ linked to: XNU
programmingLanguage	C++ ⓘ
runsIn	kernel space ⓘ
subClassOf	IOMemoryDescriptor ⓘ
superClassOf	none ⓘ
supports	non-pageable memory ⓘ pageable memory ⓘ
supportsDirection	kIODirectionIn ⓘ kIODirectionInOut ⓘ kIODirectionOut ⓘ
supportsOperation	allocate buffer ⓘ create ⓘ free buffer ⓘ get physical segment ⓘ map memory ⓘ read from buffer ⓘ write to buffer ⓘ
threadSafety	depends on driver usage ⓘ
usedBy	device drivers ⓘ
usedFor	DMA buffers ⓘ data transfer between driver and hardware ⓘ describing memory buffers ⓘ managing memory buffers ⓘ temporary I/O buffers ⓘ
usedIn	kernel drivers ⓘ kernel extensions ⓘ