IOWorkLoop class

E771035

C++ class I/O Kit event-handling mechanism I/O Kit synchronization primitive

The IOWorkLoop class is a core I/O Kit synchronization and event-handling mechanism in macOS that serializes work for kernel drivers using command gates and interrupt/event sources.

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All labels observed (3)

Label	Occurrences
IOTimerEventSource	1
IOWorkLoop class canonical	1
IOWorkLoop::workLoop()	1

How this entity was disambiguated

This entity first appeared as the object of triple T9002776 — 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: IOWorkLoop class
Context triple: [I/O Kit, includes, IOWorkLoop class]

A. IOCompletionCallback
IOCompletionCallback is a .NET delegate type used to define callback methods that the thread pool invokes when asynchronous I/O operations complete.
B. State Loop
State Loop is a type of short, state-maintained highway that typically connects major routes or provides a bypass around urban areas within a U.S. state highway system.
C. WorkerGlobalScope
WorkerGlobalScope is the global execution context for Web Workers, providing the environment and APIs that worker scripts use to run independently of the main browser thread.
D. ManualResetEvent
ManualResetEvent is a .NET synchronization primitive that allows threads to wait until a signal is set and remains signaled until it is manually reset.
E. EventWaitHandle
EventWaitHandle is a .NET synchronization primitive that allows threads or processes to signal and wait for events, coordinating execution flow in concurrent applications.
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: IOWorkLoop class
Target entity description: The IOWorkLoop class is a core I/O Kit synchronization and event-handling mechanism in macOS that serializes work for kernel drivers using command gates and interrupt/event sources.

A. IOCompletionCallback
IOCompletionCallback is a .NET delegate type used to define callback methods that the thread pool invokes when asynchronous I/O operations complete.
B. State Loop
State Loop is a type of short, state-maintained highway that typically connects major routes or provides a bypass around urban areas within a U.S. state highway system.
C. WorkerGlobalScope
WorkerGlobalScope is the global execution context for Web Workers, providing the environment and APIs that worker scripts use to run independently of the main browser thread.
D. ManualResetEvent
ManualResetEvent is a .NET synchronization primitive that allows threads to wait until a signal is set and remains signaled until it is manually reset.
E. EventWaitHandle
EventWaitHandle is a .NET synchronization primitive that allows threads or processes to signal and wait for events, coordinating execution flow in concurrent applications.
F. None of above. chosen

Statements (46)

Predicate	Object
instanceOf	C++ class ⓘ I/O Kit event-handling mechanism ⓘ I/O Kit synchronization primitive ⓘ
benefit	reduces race conditions in driver code ⓘ simplifies driver synchronization design ⓘ
concurrencyControl	prevents concurrent execution of event source actions on same work loop ⓘ
creationMethod	IOWorkLoop::workLoop() ⓘ linked to: IOWorkLoop class
designGoal	avoid explicit locking in most driver code paths ⓘ provide safe context for executing driver callbacks ⓘ
documentation	Apple Developer Documentation for I/O Kit ⓘ linked to: Apple Developer Documentation
ensures	ordered execution of work items ⓘ serialized access to driver state ⓘ
handles	command-gate-enqueued function calls ⓘ interrupt-driven events ⓘ timer-driven events ⓘ
language	C++ ⓘ
layer	kernel space ⓘ
lifecycle	created and owned by an IOService subclass ⓘ
namespace	Kernel I/O Kit ⓘ linked to: I/O Kit
operatingSystem	macOS ⓘ
partOf	IOKit framework ⓘ linked to: I/O Kit
platform	Darwin kernel ⓘ linked to: darwin
primaryRole	provide event-handling context for drivers ⓘ serialize work for kernel drivers ⓘ
provides	execution context for IOEventSource objects ⓘ mutual exclusion for driver critical sections ⓘ
relatedTo	IOCommandGate ⓘ IOEventSource ⓘ IOInterruptEventSource ⓘ IOService ⓘ IOTimerEventSource ⓘ linked to: IOEventSource
schedulingGranularity	event source callbacks ⓘ
synchronizationModel	single-threaded work loop context ⓘ
synchronizationType	cooperative serialization via work loop thread ⓘ
synchronizesWith	IOCommandGate ⓘ IOEventSource ⓘ IOInterruptEventSource ⓘ IOTimerEventSource ⓘ linked to: IOWorkLoop class
threadingModel	dedicated kernel thread or shared thread pool ⓘ
usedBy	kernel device drivers ⓘ kernel extensions ⓘ
usedFor	deferring interrupt work to thread context ⓘ handling hardware interrupts in a serialized context ⓘ scheduling timed callbacks via timer event sources ⓘ synchronizing access to hardware registers ⓘ synchronizing access to shared driver data structures ⓘ

How these facts were elicited

Referenced by (3)

Full triples — surface form annotated when it differs from this entity's canonical label.

I/O Kit → includes → IOWorkLoop class ⓘ

IOWorkLoop → synchronizesWith → IOTimerEventSource ⓘ

subject linked to: IOWorkLoop class

linked to: IOWorkLoop class

IOWorkLoop → creationMethod → IOWorkLoop::workLoop() ⓘ