Compatibility with async_std? about cluflock

[denisandroid]

This api is completely universal, and implementing your own File versions is easy.

The only thing is that there will be a different description for Windows.

For example linux:

impl FlockElement for async_std::fs::File {
	type FilePtr = async_std::os::unix::io::RawFd;

	#[inline(always)]
	fn as_file_ptr(&self) -> Self::FilePtr {
		async_std::os::unix::io::AsRawFd::as_raw_fd(self)
	}
}

Why is it so easy?

AsRawFd trait for async file is PRESENT (>>> https://docs.rs/async-std/1.7.0/async_std/fs/struct.File.html#impl-AsRawFd)

source 0: https://docs.rs/async-std/1.7.0/async_std/fs/struct.File.html#impl-AsRawFd
source 1: https://docs.rs/crate/cluFlock/1.2.5/source/src/os_release/unix.rs

// 1. Whether this will work without proper async support I'm not sure yet.
// 2. It also begs the question why the async devs didn't take https://doc.rust-lang.org/std/os/unix/io/type.RawFd.html ...
// 3. I wrote it without actually checking it, I just don't have time.

After implementing this trait, all Api calls will work the same as with a regular file, another question is whether these system calls will work.

[vlovich]

Thanks!