Poll

:::info[Note] This is a point-in-time snapshot of the API documentation from January 2026. Going forward, we will not be maintaining a public copy of these references, and recommend users to refer to the built-in signature helpers available in the Hack LSP instead for complete and up-to-date information. :::

An async poll/select equivalent for traversables without a related key

:::warning

See detailed warning at top of BasePoll

:::

Interface Synopsis

namespace HH\Lib\Async;

final class Poll extends BasePoll<mixed, Tv> implements AsyncIterator<Tv> {...}

Public Methods

• ::from(Traversable<Awaitable<Tv>> $awaitables): this
  Create a Poll from the specified list of awaitables
• ->add(Awaitable<Tv> $awaitable): void
  Add an additional awaitable to the poll
• ->addMulti(Traversable<Awaitable<Tv>> $awaitables): void
  Add multiple additional awaitables to the poll
• ->waitUntilEmptyAsync(): Awaitable<void>
  Wait for all polled Awaitables, ignoring the results

Public Methods (HH\Lib\Async\BasePoll)

• ::create(): this
• ->hasNext(): bool
• ->next(): Awaitable<?(Tk, Tv)>

Protected Methods (HH\Lib\Async\BasePoll)

• ::fromImpl(KeyedTraversable<Tk, Awaitable<Tv>> $awaitables): this
• ->addImpl(Tk $key, Awaitable<Tv> $awaitable): void
• ->addMultiImpl(KeyedTraversable<Tk, Awaitable<Tv>> $awaitables): void