runtime/race package contains the data race detector runtime library.
It is based on ThreadSanitizer race detector, that is currently a part of
the LLVM project (http://llvm.org/git/compiler-rt.git).

To update the .syso files use golang.org/x/build/cmd/racebuild.

Current runtime is built on rev 9d79ea3416bfbe3acac50e47802ee9621bf53254.
