From e943cb6c69ea9b7628cec6334abdf5ed8fc7935b Mon Sep 17 00:00:00 2001
From: Franklin Wei <git@fwei.tk>
Date: Fri, 15 Jan 2016 17:59:36 -0500
Subject: polish things

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 README.md | 59 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)
 create mode 100644 README.md

(limited to 'README.md')

diff --git a/README.md b/README.md
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+NetCosm
+=======
+
+NetCosm is currently under development. Things /WILL/ break, and
+features might drift out of existence without prior warning!
+
+## Installation
+
+### Prerequisities:
+
+libgcrypt
+libev
+linux >= 2.6.27
+glibc >= 2.9
+
+### Compiling
+
+    make
+
+This gives you the executable in `build/unix.bin`.
+
+## Todo List
+
+World persistence (partial)
+Inventory
+Verbs
+Game scripting
+NPCs
+
+## Internal Design
+
+A child process is spawned for every client that connects.  There are
+two pipes created for every child: a pipe for the child to write to,
+and a pipe for the master to write to.
+
+### Child-Master Requests
+
+Many operations, such as listing clients, require the help of the
+master process. To request an operation, the child writes it's request
+data to it's pipe to the parent. The size of the request MUST be less
+than PIPE_BUF, which is 4096 on Linux. The format of the request is as
+follows:
+
+    | Child PID | Request Length | Request Code | Data (if any) |
+
+The master polls child pipes for data, and processes any requests it
+finds. The master then writes it's data to the pipes of any children
+involved in the request, signals them with SIGRTMIN+0, and waits for
+all of them to signal back with SIGRTMIN+1. The children read the data
+from the master, and handle it accordingly.
+
+TODO: the signal-based ACK framework is really flakey. A better idea
+would be to have the child poll for data from the master at intervals,
+so the whole mess of signal handling can be avoided.
+
+## Design Goals
+
+Handle 100 simultaneous users sending 100 requests/second with 50ms
+latency.
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