Are the following statements correct ?
drop handlers can't be async
async code should use tokio:::sync::Mutex instead of std::sync::Mutex (so that waiting on a lock blocks an async task, not an OS thread)
locking a tokio::sync::Mutex in a drop handler is not possible (forces the drop handler to be async)
Therefore, if there is a Mutex that we want to use both in async code and in a drop handler, we have two suboptimal choices:
make the Mutex a std::sync => suboptimal because the async code will then block an OS thread instead of an async task
make the Mutex a tokio::sync => suboptimal because the drop handler will probably have to do some type of spawn/block_on to execute an async block to deal with the tokio::sync::Mutex
Is there a clean solution to this problem ?