Added a FIFO test to the atomic test suite.

This is really useful because we might be able to use something like this for the SDL event queue.
libsdl-org · Jan 26, 2011 · e4ed129 · e4ed129
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diff --git a/include/SDL_atomic.h b/include/SDL_atomic.h
@@ -44,6 +44,9 @@
  * subtle issues that can arise here:
  * http://msdn.microsoft.com/en-us/library/ee418650%28v=vs.85%29.aspx
  *
+ * There's also lots of good information here:
+ * http://www.1024cores.net/home/lock-free-algorithms
+ *
  * These operations may or may not actually be implemented using
  * processor specific atomic operations. When possible they are
  * implemented as true processor specific atomic operations. When that