new chapter for reals

Gankra · Gankra · commit 498e44d87a93 · 2015-07-07T21:30:14.000-07:00
diff --git a/arc-and-mutex.md b/arc-and-mutex.md
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+% Implementing Arc and Mutex
+
+Knowing the theory is all fine and good, but the *best* was to understand
+something is to use it. To better understand atomics and interior mutability,
+we'll be implementing versions of the standard library's Arc and Mutex types.
+
+TODO: ALL OF THIS OMG
