bcraig added a subscriber: bcraig.

================
Comment at: src/mutex.cpp:31
@@ +30,3 @@
+#else
+    #error "Not implemented for the selected thread API."
+#endif
----------------
Can't we just check for _LIBCPP_THREAD_API_PTHREAD once at the top of the file 
and #error as necessary there?  I don't get the value of multiple #errors for 
the same condition, but sprinkled throughout the implementation.  I do see the 
cost in the strategy, in that there are now lots of places that can bit-rot.


http://reviews.llvm.org/D19412



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