tree f0ea783c71d9c200ec1f7bd9a69b37bc663e0661
parent de9aee8a13e73ac813a24f8d400b01fb50ffea74
author Kadir Cetinkaya <kadircet@google.com> 1545050302 +0000
committer Kadir Cetinkaya <kadircet@google.com> 1545050302 +0000

[clangd] Change diskbackedstorage to be atomic

Summary:
There was a chance that multiple clangd instances could try to write
same shard, in which case we would get a malformed file most likely. This patch
changes the writing mechanism to first write to a temporary file and then rename
it to fit real destination. Which is guaranteed to be atomic by POSIX.

Reviewers: ilya-biryukov

Subscribers: ioeric, MaskRay, jkorous, arphaman, jfb, cfe-commits

Differential Revision: https://reviews.llvm.org/D55417

git-svn-id: https://llvm.org/svn/llvm-project/clang-tools-extra/trunk@349348 91177308-0d34-0410-b5e6-96231b3b80d8