Allow Concurrent Read/Write Via IPC

[jaredoconnell]

Currently, in Process, the IPC socket is declared with: socket: Arc<Mutex<SocketHandler>>

The downside to this is in order to read or write, you need to access the mutex. They cannot be done concurrently.
However, I don't think there is a benefit to single duplex communication.

In the future, especially if this becomes a performance bottleneck, it may make sense to instead have mutexes on the relevant read and write components within the SocketHandler.

[kdvalin]

There's two different ways to do this (at least by my reading).

1. Put a RwLock on the object. This seems to be intended for allowing multiple readers to lock the object, but only allowing one to write, I doubt it allows for both reading AND writing at the same time.
2. Putting a Mutex on the read/write objects in SocketHandler, we then have to figure out how to pass a struct reference safely to the green thread with mutability (Arc does not like doing this)