Enum WindowsThreadWaitReason 

pub enum WindowsThreadWaitReason {
    Executive,
    FreePage,
    PageIn,
    PoolAllocation,
    DelayExecution,
    Suspended,
    UserRequest,
    WrExecutive,
    WrFreePage,
    WrPageIn,
    WrPoolAllocation,
    WrDelayExecution,
    WrSuspended,
    WrUserRequest,
    WrEventPair,
    WrQueue,
    WrLpcReceive,
    WrLpcReply,
    WrVirtualMemory,
    WrPageOut,
    WrRendezvous,
    WrKeyedEvent,
    WrTerminated,
    WrProcessInSwap,
    WrCpuRateControl,
    WrCalloutStack,
    WrKernel,
    WrResource,
    WrPushLock,
    WrMutex,
    WrQuantumEnd,
    WrDispatchInt,
    WrPreempted,
    WrYieldExecution,
    WrFastMutex,
    WrGuardedMutex,
    WrRundown,
    WrAlertByThreadId,
    WrDeferredPreempt,
    WrPhysicalFault,
    WrIoRing,
    WrMdlCache,
    WrRcu,
    Unknown(u8),
}

Windows thread wait reason (KWAIT_REASON).

The unprefixed variants Executive..UserRequest are the kernel’s own waits. Their Wr-prefixed duals WrExecutive..WrUserRequest are the same waits performed on behalf of user mode, set when KeWaitForSingleObject is called with WaitMode = UserMode. Variants past WrUserRequest identify specific subsystems such as LPC, MM, scheduler, and locks.

Variants

Executive

Kernel-initiated generic synchronization wait on an executive object.

FreePage

Waiting for a free page in the zero/free page lists.

PageIn

Waiting for an in-progress hard-fault page read to complete.

PoolAllocation

Waiting for paged or nonpaged pool to have memory available.

DelayExecution

Self-initiated sleep via KeDelayExecutionThread.

Suspended

Thread is suspended via NtSuspendThread or an APC.

UserRequest

User-mode wait issued by a routine such as WaitForSingleObject.

WrExecutive

Waiting on an executive object on behalf of user mode.

WrFreePage

User-mode free-page wait, typically for paging.

WrPageIn

Hard page-in wait on behalf of user mode.

WrPoolAllocation

Pool-allocation wait on behalf of user mode.

WrDelayExecution

User-mode delayed execution via NtDelayExecution.

WrSuspended

User-mode thread suspension.

WrUserRequest

Alertable user-mode wait on an object.

WrEventPair

Waiting on an LPC event pair for a paired client/server handshake.

WrQueue

Waiting for a KQUEUE entry used by I/O completion and worker threads.

WrLpcReceive

LPC server waiting to receive a message from a client.

WrLpcReply

LPC client waiting for a reply from the server.

WrVirtualMemory

Waiting on a virtual-memory operation that mutates the address space.

WrPageOut

Waiting for modified-page writer to complete a page-out.

WrRendezvous

Waiting at a rendezvous point for another thread/processor.

WrKeyedEvent

Waiting on a keyed event, used by critical sections.

WrTerminated

Thread has terminated. Wait is for teardown bookkeeping.

WrProcessInSwap

Waiting for the process to be swapped back into memory.

WrCpuRateControl

Blocked by CPU rate-control / job CPU throttling.

WrCalloutStack

Waiting on a user-mode stack-switch callout.

WrKernel

Generic in-kernel wait not covered by a specific reason.

WrResource

Contending for an ERESOURCE executive resource.

WrPushLock

Contending for an EX_PUSH_LOCK.

WrMutex

Waiting to acquire a KMUTEX / KMUTANT.

WrQuantumEnd

Quantum has ended. Rescheduled pending context switch.

WrDispatchInt

Awaiting a dispatch interrupt to run the scheduler.

WrPreempted

Preempted by a higher-priority thread.

WrYieldExecution

Voluntarily yielded CPU via NtYieldExecution.

WrFastMutex

Contending for a FAST_MUTEX.

WrGuardedMutex

Contending for a KGUARDED_MUTEX.

WrRundown

Blocked on an EX_RUNDOWN_REF rundown-protection drain.

WrAlertByThreadId

Blocked on NtWaitForAlertByThreadId / thread-ID alert.

WrDeferredPreempt

Preemption deferred pending a scheduler decision.

WrPhysicalFault

Waiting to service a hardware/physical memory fault.

WrIoRing

Blocked on an I/O ring submission/completion.

WrMdlCache

Waiting for an MDL cache slot to become available.

WrRcu

Blocked inside an RCU grace period.

Unknown(u8)

Unknown wait reason value not covered by known variants.

Trait Implementations

impl Clone for WindowsThreadWaitReason

fn clone(&self) -> WindowsThreadWaitReason

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for WindowsThreadWaitReason

impl Debug for WindowsThreadWaitReason

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for WindowsThreadWaitReason

impl From<u8> for WindowsThreadWaitReason

fn from(value: u8) -> Self

Converts to this type from the input type.

impl PartialEq for WindowsThreadWaitReason

fn eq(&self, other: &WindowsThreadWaitReason) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for WindowsThreadWaitReason