[PATCH] D20942: [LockFileManager] Improve error output by adding error messages

[Bruno Cardoso Lopes via cfe-commits]

bruno created this revision.
bruno added a reviewer: benlangmuir.
bruno added subscribers: cfe-commits, dexonsmith.

This is currently used by clang to lock access to modules; improve the error message so that clang can use better output messages from locking error issues.


http://reviews.llvm.org/D20942

Files:
  include/llvm/Support/LockFileManager.h
  lib/Support/LockFileManager.cpp

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