Thread pools

Thread pools also often do not run directly on the web, due to limitations of WASM. Here, we provide cross-platform thread pools. For example, you can execute in a thread by:

FLUTTER_RUST_BRIDGE_HANDLER.thread_pool().execute(transfer!(|| {
    // your code executed in another thread
}));

The transfer! macro is there in case you need to move data to that thread (which needs a bit of trick in WASM, encapsulated inside the macro). We may improve the API in the future.