# Asynchronous Host Functions
You can also [browse this source code online][code] and clone the wasmtime
repository to run the example locally.
[code]: https://github.com/bytecodealliance/wasmtime/blob/main/examples/async.cc
This example demonstrates configuring Wasmtime for asynchronous operation and calling async host functions from wasm.
## Wasm Source
```wat
{{#include ../examples/async.wat}}
```
## Host Source
<!-- langtabs-start -->
```cpp
{{#include ../examples/async.cc}}
```
<!-- langtabs-end -->