[PATCH] D123225: [ThreadPool] add ability to group tasks into separate groups

[Luboš Luňák via Phabricator via llvm-commits]

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This is needed for parallelizing of loading modules symbols in LLDB (D122975 <https://reviews.llvm.org/D122975>). Currently LLDB can parallelize indexing symbols when loading a module, but modules are loaded sequentially. If LLDB index cache is enabled, this means that the cache loading is not parallelized, even though it could. However doing that creates a threadpool-within-threadpool situation, so the number of threads would not be properly limited.

This change adds ThreadPool::TaskGroup as a tag type that can be used with ThreadPool calls to put tasks into groups that can be independently waited for (even recursively from within a task) but still run in the same thread pool.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D123225

Files:
  llvm/include/llvm/Support/ThreadPool.h
  llvm/lib/Support/ThreadPool.cpp
  llvm/tools/llvm-profdata/llvm-profdata.cpp
  llvm/unittests/Support/ThreadPool.cpp

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