[PATCH] D14427: [tsan] Implement an invisible barrier in the runtime to make it available on OS X

[Kuba Brecka via llvm-commits]

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

For the lit tests, we currently have a "TSan-invisible barrier" that is implemented by dlsym-ing `pthread_barrier_wait`.  However, on OS X, pthread barriers are not available, so we need to reimplement them.

This patch proposes to provide `__tsan_invisible_barrier_init` and `__tsan_invisible_barrier_wait` in the TSan runtime, with different implementations based on the platform.  This way, we don't need the dlsym trick.

http://reviews.llvm.org/D14427

Files:
  lib/tsan/rtl/tsan.syms.extra
  lib/tsan/rtl/tsan_interface.h
  lib/tsan/rtl/tsan_platform_linux.cc
  lib/tsan/rtl/tsan_platform_mac.cc
  test/tsan/test.h

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