[Week 8]: Add simple development.md; Tidy Crates

[lvyuemeng]

Summary

PR

• Add development.md to put a introduction to the project.

PR

• Partially tidy the crates, which the ipc part is needed to be further designed, thus the confliction isn't solved here.

Reflection

In asynchronous runtime, one has to create a copy of instance to appease lifetime check and async move {} closure, we need to separate the Arc<T> of instance in intra-threads, and rc of Header inter-process. Which the former is to copy itself into the different part threads part if necessary, because ShmBox<T,A> will concede the lifetime of itself to the allocator, in multi-threads case, one have to deal with it, or to use Arc<A> as A, which elide it.

The bottleneck is basically the queue part, lfqueue is efficient, but the api design of mine is bad, to adapt multiple backend, also increase the generic parameters input, which is also needed further discussion.

ShmBox is the basic ipc transfer instance, which only retains Slice or Sized part, the pros is that it maintains the type semantics, cons is the api is actually highly relevant to Box, experimental features.

Design Thought

• A simpler interface of SQE/CQE to elide ShmBox in UringSepc.
• Default parameter to reduce reduncancy in configuration of Driver and Allocator, leaving the main part of ShmBackend.
• Combine Submitter + AllocHandle to allocate and send thing seamlessly.

To maximally reduce the configuration part and establish a simpler, readable api.