[PATCH] D48115: Make ThreadPool support running tasks that return values

[Zachary Turner via Phabricator via llvm-commits]

zturner created this revision.
zturner added reviewers: labath, dblaikie, davide.
Herald added a subscriber: hiraditya.

previously `ThreadPool` could only execute tasks that did something, not tasks that returned values.  We can improve this with a little bit of type erasure.  The idea is that instead of queueing up `packaged_task<void()>`'s, we queue up `unique_ptr<TaskBase>`, where `TaskBase` is a base class that has an pure virtual `execute()` method.  A templated derived class stores an appropriately typed `package_task<T()>`, which is run with `execute()` is called.


https://reviews.llvm.org/D48115

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

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