[PATCH] D15048: [tsan] Add dispatch_group API interceptors and synchronization

[Kuba Brecka via llvm-commits]

kubabrecka created this revision.
kubabrecka added reviewers: dvyukov, kcc, glider, samsonov.
kubabrecka added subscribers: llvm-commits, zaks.anna, ismailp.

This patch adds release and acquire semantics for dispatch groups, plus a test case.

http://reviews.llvm.org/D15048

Files:
  lib/tsan/rtl/tsan_libdispatch_mac.cc
  test/tsan/Darwin/gcd-groups-norace.mm

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