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API reference / Synchronization

ManualResetEvent class

A manual-reset event for tasks.

Use
import ThinkMeta.ConcurrentTasks.Synchronization.ManualResetEvent;
Namespace
ThinkMeta::ConcurrentTasks::Synchronization
Inherits
Waitable, ISuspendCallback

Syntax

using ManualResetEvent = _ManualResetEvent<SuspensionKind::Multiple>;
using ManualResetEvent_s = _ManualResetEvent<SuspensionKind::Single>;

Template parameters

_SuspensionKindSuspensionKind
SuspensionKind::Multiple: any number of waiting tasks; SuspensionKind::Single: at most one waiting task at a time, cheaper, with timeouts.

Remarks

While set, every Wait passes; Set resumes all waiting tasks. Comes as ManualResetEvent (any number of waiters) and ManualResetEvent_s (one waiter). Wait suspends the calling task and needs a task or an OS thread converted with ConvertThreadToTask. Set, Reset and TryWait never suspend and may be called from any thread (the core's I/O thread calls Set). No member reports errors. ManualResetEvent: any number of waiters, no timeouts. Destroy the event only when no task can wait on it or set it any more and the last Set has returned; the return of a Wait alone does not mean that, since Set may still be resuming other waiters (ManualResetEvent_s allows destroying it right after the wait).

See also

AutoResetEvent, SuspensionKind

Names

NameDescription
ManualResetEvent Manual-reset event for any number of waiting tasks (no timeouts).
ManualResetEvent_s Manual-reset event for at most one waiting task.

Cheaper than ManualResetEvent, allows timeouts; the waiter may destroy it after its wait.

Constructors

ManualResetEvent

Creates the event.

Syntax

explicit ManualResetEvent(bool isSet = false) noexcept;

Parameters

isSetbool
true to create it set.Default: false

~ManualResetEvent

Destroys the event.

Syntax

~ManualResetEvent() noexcept;

Remarks

No task may be waiting on it (asserted in Debug).

Methods

Set

Sets the event and resumes every task suspended on it.

Syntax

void Set() noexcept;

Remarks

Never suspends; any thread.

See also

Reset, Wait

Reset

Clears the event.

Syntax

void Reset() noexcept;

Remarks

Later Wait calls suspend again. Never suspends; any thread.

See also

Set

TryWait

Tells whether the event is set, without changing it.

Syntax

[[nodiscard]] bool TryWait() noexcept;

Return value

Type: bool

true if the event is set; otherwise false.

Remarks

Never suspends; any thread.

See also

Wait

Wait

Waits until the event is set.

Syntax

void Wait() noexcept;

Remarks

Returns at once if the event is set, otherwise suspends the calling task until Set. Task or converted thread only; at most one waiter at a time.

See also

TryWait

Waits until the event is set, with a time limit.

Syntax

[[nodiscard]] bool Wait(Duration timeout) noexcept;

Parameters

timeoutDuration
The longest time to wait. Needs EnableTimers; without it the wait has no limit.

Return value

Type: bool

true if the event is set; false if it timed out: the task no longer waits on the event; the event may be set later.

Remarks

Task or converted thread only.

See also

TryWait

Generated from ThinkMeta.ConcurrentTasks.API @ 137ec1d (2026-10-17).