[PATCH] D93726: [clangd] Use atomics instead of locks to track periodic memory trimming

[Sam McCall via Phabricator via cfe-commits]

sammccall created this revision.
sammccall added a reviewer: qchateau.
Herald added subscribers: usaxena95, kadircet, jfb, arphaman.
sammccall requested review of this revision.
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Herald added a project: clang.

Instead of always locking/unlocking a contended mutex, we now do one atomic read
in the common case, and one read + one exchange if the timer has expried.

Also use this for memory profiling which has similar/compatible requirements.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D93726

Files:
  clang-tools-extra/clangd/ClangdLSPServer.cpp
  clang-tools-extra/clangd/ClangdLSPServer.h
  clang-tools-extra/clangd/support/Threading.cpp
  clang-tools-extra/clangd/support/Threading.h
  clang-tools-extra/clangd/unittests/support/ThreadingTests.cpp

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