Index: test/tsan/bench_acquire_only.cc
===================================================================
--- test/tsan/bench_acquire_only.cc
+++ test/tsan/bench_acquire_only.cc
@@ -1,6 +1,9 @@
 // RUN: %clangxx_tsan %s -o %t
 // RUN: %run %t 2>&1 | FileCheck %s
 
+// bench.h needs pthread barriers which are not available on OS X
+// UNSUPPORTED: darwin
+
 #include "bench.h"
 
 int x;
Index: test/tsan/bench_acquire_release.cc
===================================================================
--- test/tsan/bench_acquire_release.cc
+++ test/tsan/bench_acquire_release.cc
@@ -1,6 +1,9 @@
 // RUN: %clangxx_tsan %s -o %t
 // RUN: %run %t 2>&1 | FileCheck %s
 
+// bench.h needs pthread barriers which are not available on OS X
+// UNSUPPORTED: darwin
+
 #include "bench.h"
 
 int x;
Index: test/tsan/bench_local_mutex.cc
===================================================================
--- test/tsan/bench_local_mutex.cc
+++ test/tsan/bench_local_mutex.cc
@@ -1,6 +1,9 @@
 // RUN: %clangxx_tsan %s -o %t
 // RUN: %run %t 2>&1 | FileCheck %s
 
+// bench.h needs pthread barriers which are not available on OS X
+// UNSUPPORTED: darwin
+
 #include "bench.h"
 
 pthread_mutex_t *mtx;
Index: test/tsan/bench_mutex.cc
===================================================================
--- test/tsan/bench_mutex.cc
+++ test/tsan/bench_mutex.cc
@@ -1,6 +1,9 @@
 // RUN: %clangxx_tsan %s -o %t
 // RUN: %run %t 2>&1 | FileCheck %s
 
+// bench.h needs pthread barriers which are not available on OS X
+// UNSUPPORTED: darwin
+
 #include "bench.h"
 
 pthread_mutex_t mtx;
Index: test/tsan/bench_release_only.cc
===================================================================
--- test/tsan/bench_release_only.cc
+++ test/tsan/bench_release_only.cc
@@ -1,6 +1,9 @@
 // RUN: %clangxx_tsan %s -o %t
 // RUN: %run %t 2>&1 | FileCheck %s
 
+// bench.h needs pthread barriers which are not available on OS X
+// UNSUPPORTED: darwin
+
 #include "bench.h"
 
 int *x;
Index: test/tsan/bench_rwmutex.cc
===================================================================
--- test/tsan/bench_rwmutex.cc
+++ test/tsan/bench_rwmutex.cc
@@ -1,6 +1,9 @@
 // RUN: %clangxx_tsan %s -o %t
 // RUN: %run %t 2>&1 | FileCheck %s
 
+// bench.h needs pthread barriers which are not available on OS X
+// UNSUPPORTED: darwin
+
 #include "bench.h"
 
 pthread_rwlock_t mtx;
Index: test/tsan/bench_single_writer.cc
===================================================================
--- test/tsan/bench_single_writer.cc
+++ test/tsan/bench_single_writer.cc
@@ -1,6 +1,9 @@
 // RUN: %clangxx_tsan %s -o %t
 // RUN: %run %t 2>&1 | FileCheck %s
 
+// bench.h needs pthread barriers which are not available on OS X
+// UNSUPPORTED: darwin
+
 #include "bench.h"
 
 int x;
Index: test/tsan/bench_ten_mutexes.cc
===================================================================
--- test/tsan/bench_ten_mutexes.cc
+++ test/tsan/bench_ten_mutexes.cc
@@ -1,6 +1,9 @@
 // RUN: %clangxx_tsan %s -o %t
 // RUN: %run %t 2>&1 | FileCheck %s
 
+// bench.h needs pthread barriers which are not available on OS X
+// UNSUPPORTED: darwin
+
 #include "bench.h"
 
 const int kMutex = 10;
Index: test/tsan/race_on_barrier.c
===================================================================
--- test/tsan/race_on_barrier.c
+++ test/tsan/race_on_barrier.c
@@ -1,4 +1,8 @@
 // RUN: %clang_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s
+
+// pthread barriers are not available on OS X
+// UNSUPPORTED: darwin
+
 #include "test.h"
 
 pthread_barrier_t B;
Index: test/tsan/race_on_barrier2.c
===================================================================
--- test/tsan/race_on_barrier2.c
+++ test/tsan/race_on_barrier2.c
@@ -1,4 +1,8 @@
 // RUN: %clang_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s
+
+// pthread barriers are not available on OS X
+// UNSUPPORTED: darwin
+
 #include <pthread.h>
 #include <stdio.h>
 #include <stddef.h>