[PATCH] D51170: [libc++] Remove race condition in std::async

[Louis Dionne via Phabricator via cfe-commits]

ldionne created this revision.
ldionne added a reviewer: mclow.lists.
Herald added a reviewer: EricWF.
Herald added subscribers: cfe-commits, dexonsmith, christof.

The state associated to the future was set in one thread (with synchronization)
but read in another thread without synchronization, which led to a data race.

https://bugs.llvm.org/show_bug.cgi?id=38682
rdar://problem/42548261


Repository:
  rCXX libc++

https://reviews.llvm.org/D51170

Files:
  libcxx/include/future
  libcxx/src/future.cpp
  libcxx/test/std/thread/futures/futures.async/async_race.38682.pass.cpp

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