A lightweight, async-safe, allocation-free one-time initialization gate. Ensures a given asynchronous initialization routine runs exactly once, even under concurrent callers, with support for cancellation, safe publication, and disposal.

Thread-safe async lazy initializer that runs a factory once, shares the in-flight operation, and caches the result. Supports Task and ValueTask factories with optimized synchronous paths and optional reset.

The fastest .NET async lock

Primitive for representing deferred, stateful async action invocations with zero closure allocations.

Primitive for representing deferred, stateful async function invocations with zero closure allocations.