[PATCH] D92381: [clangd] Extract per-dir CDB cache to its own threadsafe class. NFC

[Sam McCall via Phabricator via cfe-commits]

sammccall created this revision.
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This is a step towards making compile_commands.json reloadable.

The idea is:

- in addition to rare CDB loads we're soon going to have somewhat-rare CDB reloads and fairly-common stat() of files to validate the CDB
- so stop doing all our work under a big global lock, instead using it to acquire per-directory structures with their own locks
- each directory can be refreshed from disk every N seconds, like filecache
- avoid locking these at all in the most common case: directory has no CDB


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D92381

Files:
  clang-tools-extra/clangd/GlobalCompilationDatabase.cpp
  clang-tools-extra/clangd/GlobalCompilationDatabase.h

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