sammccall added inline comments.

================
Comment at: clangd/index/Background.cpp:194
-  // FIXME: partition the symbols by file rather than TU, to avoid duplication.
-  IndexedSymbols.update(AbsolutePath,
-                        llvm::make_unique<SymbolSlab>(std::move(Symbols)),
----------------
kadircet wrote:
> sammccall wrote:
> > um, this (before your patch) doesn't look even slightly threadsafe. Sorry I 
> > didn't catch it in code review.
> > 
> > Now I'm not sure whether it makes sense for you to fix it or not. It seems 
> > fine to use two independent locks here, to me - we don't need actual 
> > consistency.
> Ah, sorry for missing on my side as well. But IIUC, the only unsafe part is 
> access to `FileHash` since `FileSymbols::update` is already thread-safe ?
> 
> If need be I can send out a patch to fix those issues.
Oops, you're right - I forgot `FileSymbols` was threadsafe.

Then I think FileHash itself is indeed the only issue and this patch 
(DigestsMu) fixes it already. Carry on!


Repository:
  rCTE Clang Tools Extra

https://reviews.llvm.org/D53433



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