[PATCH] D78896: [Support] Add file lock/unlock functions

[Serge Pavlov via Phabricator via llvm-commits]

sepavloff created this revision.
sepavloff added reviewers: rnk, MaskRay, labath, sammccall.
Herald added a subscriber: hiraditya.
Herald added a project: LLVM.
sepavloff added a child revision: D78897: [Support] raw_fd_ostream can lock file before write.

New functions `lockFile` and `unlockFile` implement simple file locking.
They lock or unlock entire file. This must be enough to support
simulataneous writes to log files in parallel builds.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D78896

Files:
  llvm/include/llvm/Support/FileSystem.h
  llvm/lib/Support/Unix/Path.inc
  llvm/lib/Support/Windows/Path.inc
  llvm/unittests/Support/Path.cpp

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