[PATCH] D78897: [Support] raw_fd_ostream can lock file before write

[Serge Pavlov via Phabricator via llvm-commits]

sepavloff created this revision.
sepavloff added reviewers: ruiu, labath, csigg, jhenderson.
Herald added a subscriber: hiraditya.
Herald added a project: LLVM.
sepavloff added a parent revision: D78896: [Support] Add file lock/unlock functions.

Using new methods `lockForUpdate` and `lockTimeout` an instance of
raw_fd_ostream can be put into mode in which it locks underlying file
before each write and unlocks it immediately after. This is convenience
method, it allows transparent operations on log files in parallel builds,
when several processes write into the same file.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D78897

Files:
  llvm/include/llvm/Support/raw_ostream.h
  llvm/lib/Support/raw_ostream.cpp
  llvm/unittests/Support/raw_ostream_test.cpp

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