--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/unittests/Support/ManagedStatic.cpp	Thu Dec 12 13:56:28 2013 +0900
@@ -0,0 +1,62 @@
+//===- llvm/unittest/Support/ManagedStatic.cpp - ManagedStatic tests ------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+#include "llvm/Support/ManagedStatic.h"
+#include "llvm/Config/config.h"
+#include "llvm/Support/Threading.h"
+#ifdef HAVE_PTHREAD_H
+#include <pthread.h>
+#endif
+
+#include "gtest/gtest.h"
+
+using namespace llvm;
+
+namespace {
+
+#if LLVM_ENABLE_THREADS != 0 && defined(HAVE_PTHREAD_H) && \
+  !__has_feature(memory_sanitizer)
+namespace test1 {
+  llvm::ManagedStatic<int> ms;
+  void *helper(void*) {
+    *ms;
+    return NULL;
+  }
+
+  // Valgrind's leak checker complains glibc's stack allocation.
+  // To appease valgrind, we provide our own stack for each thread.
+  void *allocate_stack(pthread_attr_t &a, size_t n = 65536) {
+    void *stack = malloc(n);
+    pthread_attr_init(&a);
+#if defined(__linux__)
+    pthread_attr_setstack(&a, stack, n);
+#endif
+    return stack;
+  }
+}
+
+TEST(Initialize, MultipleThreads) {
+  // Run this test under tsan: http://code.google.com/p/data-race-test/
+
+  pthread_attr_t a1, a2;
+  void *p1 = test1::allocate_stack(a1);
+  void *p2 = test1::allocate_stack(a2);
+
+  llvm_start_multithreaded();
+  pthread_t t1, t2;
+  pthread_create(&t1, &a1, test1::helper, NULL);
+  pthread_create(&t2, &a2, test1::helper, NULL);
+  pthread_join(t1, NULL);
+  pthread_join(t2, NULL);
+  free(p1);
+  free(p2);
+  llvm_stop_multithreaded();
+}
+#endif
+
+} // anonymous namespace