Description
All functions which block the current thread need to get deleted. This includes almost all of the std::os module. This is all legacy code at this point and it needs to get all rebuilt on the new runtime's libuv implementation.
Most file operations are exposed through rt::io::file, which I think is comprehensive enough, but this may involve adding more uv bindings where necessary.
I'm not tagging this as E-easy because I don't think that it's a straightforward refactoring. This will involve understanding how to migrate functions and being sure to expose errors which occur at the underlying layer.
This may also be best held off until #6163 is dealt with, but it's going to be painful in either way from what I can tell.
Nominating for 1.0, we can never block a thread in a syscall.