Reorganize table of contents

Author: jserv

README.md

@@ -1,22 +1,32 @@
 # Complementary Programs for course "Linux Kernel Internals"
 
+This distribution is a collection of programs that are generally unrelated,
+except in that they all deal with the concurrent programming. The main
+purpose of these programs is to be illustrative and educational.
+
 ## Project Listing
-- [tpool](tpool/): A lightweight thread pool.
-- [tinync](tinync/): A tiny `nc` implementation using coroutine.
-- [fiber](fiber/): A user-level thread (fiber) using `clone` system call.
-- [picosh](picosh/): A minimalist UNIX shell.
-- [httpd](httpd/): A multi-threaded web server.
-- [ringbuffer](ringbuffer/): A lock-less ring buffer.
-- [mbus](mbus/): A concurrent message bus.
-- [spmc](spmc/): A concurrent single-producer/multiple-consumer queue.
-- [map-reduce](map-reduce/): word counting using MapReduce.
-- [mpmc](mpmc/): A multiple-producer/multiple-consumer (MPMC) queue.
-- [channel](channel/): A Linux futex based Go channel implementation.
-- [redirect](redirect/): An I/O multiplexer to monitor stdin redirect using `timerfd` and `epoll`.
-- [rcu\_list](rcu_list/): A concurrent linked list utilizing the simplified RCU algorithm.
-- [ringbuf\_shm](ringbuf_shm/): An optimized lock-free ring buffer with shared memory.
-- [qsbr](qsbr/): An implementation of Quiescent state based reclamation (QSBR).
-- [preempt\_sched](preempt_sched/): A preemptive userspace multitasking based on a SIGALRM signal.
+* [Coroutine](https://en.wikipedia.org/wiki/Coroutine)
+    - [tinync](tinync/): A tiny `nc` implementation using coroutine.
+    - [fiber](fiber/): A user-level thread (fiber) using `clone` system call.
+    - [preempt\_sched](preempt_sched/): A preemptive userspace multitasking based on a SIGALRM signal.
+* Multi-threading Paradigms
+    - [tpool](tpool/): A lightweight thread pool.
+* [Producer–consumer problem](https://en.wikipedia.org/wiki/Producer%E2%80%93consumer_problem)
+    - [spmc](spmc/): A concurrent single-producer/multiple-consumer queue.
+    - [mpmc](mpmc/): A multiple-producer/multiple-consumer (MPMC) queue.
+    - [channel](channel/): A Linux futex based Go channel implementation.
+* [Lock-Free](https://en.wikipedia.org/wiki/Non-blocking_algorithm) Data Structure
+    - [ringbuffer](ringbuffer/): A lock-less ring buffer.
+    - [ringbuf\_shm](ringbuf_shm/): An optimized lock-free ring buffer with shared memory.
+    - [mbus](mbus/): A concurrent message bus.
+* [Synchronization](https://en.wikipedia.org/wiki/Synchronization_(computer_science))
+    - [rcu\_list](rcu_list/): A concurrent linked list utilizing the simplified RCU algorithm.
+    - [qsbr](qsbr/): An implementation of Quiescent state based reclamation (QSBR).
+* Applications
+    - [httpd](httpd/): A multi-threaded web server.
+    - [map-reduce](map-reduce/): word counting using MapReduce.
+    - [redirect](redirect/): An I/O multiplexer to monitor stdin redirect using `timerfd` and `epoll`.
+    - [picosh](picosh/): A minimalist UNIX shell.
 
 ## License