poll-promise is a Rust crate for polling the result of a concurrent (e.g. async) operation. This is in particular useful in games and immediate mode GUI:s, where one often wants to start a background operation and then ask "are we there yet?" on each subsequent frame until the operation completes.
Example:
let promise = poll_promise::Promise::spawn_thread("slow_operation", something_slow);
// Then in the game loop or immediate mode GUI code:
if let Some(result) = promise.ready() {
// Use/show result
} else {
// Show a loading icon
}If you enable the tokio feature you can use poll-promise with the tokio runtime.
The crate is primarily useful as a high-level building block in apps.
This crate provides convenience methods to spawn threads and tokio tasks, and methods that block on waiting for a result. This is gererally a bad idea to do in a library, as decisions about execution environments and thread blocking should be left to the app. So we do not recommend using this crate for libraries in its current state.
Similar functionality is provided by:
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