wasm_main_executor

在主浏览器线程上运行futures

某些任务，例如创建AudioContext或RtcPeerConnection，只能在主浏览器线程上执行。wasm_main_executor提供了一个简单的方法，可以从任何上下文将futures发送到主浏览器线程。这允许Web Worker启动主线程任务并等待它们完成，并有助于实现跨线程polyfills/shims。

用法

以下是一个简单的执行器使用示例

async fn test_future() -> i32 {
    // Do some async or main-threaded work...
    2
}

// Start the executor. This must be called from the main browser thread.
wasm_main_executor::initialize().unwrap();

// Futures may be spawned on background threads using the executor.
// The future runs on the main thread.
let fut = wasm_main_executor::spawn(test_future());

// A future is returned which may be awaited on the background thread.
assert_eq!(2, futures::executor::block_on(fut));