[all-commits] [llvm/llvm-project] a5fff5: [ThreadPool] Do not return shared futures.

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: a5fff58781f30ff3fd7a3f56948552cf7b8842bb
      https://github.com/llvm/llvm-project/commit/a5fff58781f30ff3fd7a3f56948552cf7b8842bb
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2021-11-23 (Tue, 23 Nov 2021)

  Changed paths:
    M llvm/include/llvm/Support/ThreadPool.h
    M mlir/include/mlir/IR/Threading.h

  Log Message:
  -----------
  [ThreadPool] Do not return shared futures.

The only users of returned futures from ThreadPool is llvm-reduce after
D113857.

There should be no cases where multiple threads wait on the same future,
so there should be no need to return std::shared_future<>. Instead return
plain std::future<>.

If users need to share a future between multiple threads, they can share
the futures themselves.

Reviewed By: Meinersbur, mehdi_amini

Differential Revision: https://reviews.llvm.org/D114363