ThreadInformationClass Enum

The ThreadInformationClass enumeration defines identifiers that specify a particular kind of thread information that can be queried or set using thread-management functions such as NtQueryInformationThread and NtSetInformationThread.

Value	Name	Description
0	ThreadBasicInformation	Basic information about the thread, such as its ID, exit status, and priority.
1	ThreadTimes	Execution times for the thread, includes kernel and user time.
2	ThreadPriority	Current priority level for the thread.
3	ThreadBasePriority	Base priority used when the thread is scheduled.
4	ThreadAffinityMask	Affinity mask that determines the processors on which the thread can run.
5	ThreadImpersonationToken	Impersonation token associated with the thread.
6	ThreadDescriptorTableEntry	Descriptor table entry for the thread (used primarily on x86).
7	ThreadEnableAlignmentFaultFixup	Indicates whether alignment fault fix‑up is enabled for the thread.
8	ThreadEventPair	Event pair object associated with the thread.
9	ThreadQuerySetWin32StartAddress	Wins32 start address of the thread.
10	ThreadZeroTlsCell	Specify a TLS cell to zero.
11	ThreadPerformanceCount	High‑resolution performance counter for the thread.
12	ThreadAmil	Legacy identifier – not used in current versions.
13	ThreadIdealProcessor	Ideal processor for the thread.
14	ThreadPriorityBoost	Whether priority boosting is enabled for the thread.
15	ThreadSetTlsArrayAddress	Set the address of the thread’s TLS array.
16	ThreadIsIoPending	Indicates whether the thread has pending I/O operations.
17	ThreadHideFromDebugger	Specifies if the thread is hidden from debuggers.
18	ThreadBreakOnTermination	Break on thread termination (used for debugging).
19	ThreadSwitchLegacyState	Legacy switch state information.
20	ThreadIsTerminated	Indicates if the thread has terminated.
21	ThreadLastSystemCall	Information about the last system call made by the thread.
22	ThreadIoPriority	Current I/O priority of the thread.
23	ThreadCycleTime	Processor cycle time used by the thread.
24	ThreadPagePriority	Memory page priority for the thread.
25	ThreadActualBasePriority	Actual base priority as computed by the scheduler.
26	ThreadTebInformation	Information about the thread's TEB (Thread Environment Block).
27	ThreadCSwitchMon	Context switch monitoring info.
28	ThreadCSwitchPmu	Performance monitoring unit data for context switches.
29	ThreadWow64Context	WOW64 context for 32‑bit threads on 64‑bit OS.
30	ThreadGroupInformation	Group affinity and other group‑related data.
31	ThreadUmsInformation	User‑mode scheduling information.
32	ThreadCounterProfiling	Counter‑based profiling data for the thread.
33	ThreadIdealProcessorEx	Extended ideal processor information.
34	ThreadCpuClockInfo	High‑resolution CPU clock information.
35	ThreadSuspendCount	Current suspend count of the thread.
36	ThreadHeterogeneousCpuPolicy	Policy for heterogeneous CPU architecture.
37	ThreadContainerId	Container ID that the thread belongs to (for containerization).
38	ThreadCreateTime	Exact timestamp when the thread was created.
39	ThreadPerformanceCountEx	Extended performance counter information.
40	ThreadDynamicCodePolicyInfo	Policy applied to dynamic code generation for the thread.
41	ThreadManagedThreadInfo	Information for managed (CLR) threads.
42	ThreadPowerThrottlingState	Power throttling state of the thread.
43	ThreadWorkOnBehalfTicket	Work‑on‑behalf ticket for impersonation scenarios.
44	ThreadEffectiveIoPriority	Effective I/O priority after accounting for system policies.
45	ThreadSchedulerSharedData	Shared scheduler data for the thread.
46	ThreadSmtRelatedThreadInformation	Information about sibling threads on the same SMT (Simultaneous Multithreading) core.
47	ThreadSmtSettings	SMT (Hyper‑Threading) settings for the thread.
48	ThreadMdlInformation	Memory Descriptor List (MDL) information for the thread.
49	ThreadCStateInformation	C‑state (idle state) information for power management.
50	ThreadCacheInformation	Cache allocation and usage details for the thread.
51	ThreadWakeUpCounters	Statistics about thread wake‑ups.
52	ThreadStackInformation	Stack size and usage details.

For more details on each value, see the NtQueryInformationThread and NtSetInformationThread function pages.