56 lines
1.6 KiB
Rust
56 lines
1.6 KiB
Rust
// Copyright 2021 The Matrix.org Foundation C.I.C.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//! Abstraction over an executor so we can spawn tasks under WASM the same way
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//! we do usually.
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#[cfg(target_arch = "wasm32")]
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use std::{
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future::Future,
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pin::Pin,
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task::{Context, Poll},
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};
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#[cfg(target_arch = "wasm32")]
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use futures_util::{future::RemoteHandle, FutureExt};
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#[cfg(not(target_arch = "wasm32"))]
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pub use tokio::task::{spawn, JoinHandle};
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#[cfg(target_arch = "wasm32")]
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pub fn spawn<F, T>(future: F) -> JoinHandle<T>
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where
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F: Future<Output = T> + 'static,
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{
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let fut = future.unit_error();
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let (fut, handle) = fut.remote_handle();
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wasm_bindgen_futures::spawn_local(fut);
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JoinHandle { handle }
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}
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#[cfg(target_arch = "wasm32")]
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#[derive(Debug)]
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pub struct JoinHandle<T> {
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handle: RemoteHandle<Result<T, ()>>,
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}
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#[cfg(target_arch = "wasm32")]
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impl<T: 'static> Future for JoinHandle<T> {
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type Output = Result<T, ()>;
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fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
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Pin::new(&mut self.handle).poll(cx)
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}
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}
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