Manual Executor

This is a manual executor for driving futures to readiness. You need to manually wake the futures! But of course what else dit you expect from an executor that is called manual-executor. Because of the manual nature the use cases of this executor are limited.

It was built to be used via ffi (also wasm). Imagine a library that wants to do a http-request. It has no way of doing it except via the host. So the host exposes a fetch function that does the http-request. This is all done asynchronously. How does the library know when the fetch function is done? That problem is solved with the manual-executor. The host simply calls the wake (or wake_all if you are a bit sloppy) function with the appropriate key.

coverage

Install grcov, llvm-tools.

Like this (on arch)

pacman -S grcov
rustup component add llvm-tools

You might want to manually clean up the target directory from time to time to keep grcov form not erroring...