[PATCH] D25784: [Support] ThreadPool: Don't spawn any threads when ThreadCount = 1

[Vedant Kumar via llvm-commits]

vsk created this revision.
vsk added reviewers: joker-eph, tejohnson.
vsk added a subscriber: llvm-commits.

This should save clients the time/memory overhead of spawning a thread when ThreadCount/std::thread::hardware_concurrency() = 1. IMO this is also a de facto simplification of the ThreadPool API, because clients no longer have to maintain slightly separate code paths for the ThreadCount = 1 / ThreadCount > 1 cases.

Tested by running unittests/Support/SupportTests configured with -DLLVM_ENABLE_THREADS={On,Off}.


https://reviews.llvm.org/D25784

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

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