Imported Upstream version 6.10.0.49

Former-commit-id: 1d6753294b2993e1fbf92de9366bb9544db4189b

external/llvm-project/compiler-rt/test/tsan/custom_mutex4.cc

@@ -0,0 +1,33 @@
+// RUN: %clangxx_tsan -O1 --std=c++11 %s -o %t && %run %t 2>&1 | FileCheck %s
+#include "custom_mutex.h"
+
+#include <type_traits>
+
+// Test that the destruction events of a mutex are ignored when the
+// annotations request this.
+//
+// Use after destruction is UB, but __tsan_mutex_linker_init and
+// __tsan_mutex_not_static exist to support global variables of mutex type,
+// which might be accessed during program shutdown after the class's destructor
+// has run.
+
+int main() {
+  std::aligned_storage<sizeof(Mutex), alignof(Mutex)>::type mu1_store;
+  Mutex* mu1 = reinterpret_cast<Mutex*>(&mu1_store);
+  new(&mu1_store) Mutex(false, __tsan_mutex_linker_init);
+  mu1->Lock();
+  mu1->~Mutex();
+  mu1->Unlock();
+
+  std::aligned_storage<sizeof(Mutex), alignof(Mutex)>::type mu2_store;
+  Mutex* mu2 = reinterpret_cast<Mutex*>(&mu2_store);
+  new(&mu2_store) Mutex(false, 0, __tsan_mutex_not_static);
+  mu2->Lock();
+  mu2->~Mutex();
+  mu2->Unlock();
+
+  fprintf(stderr, "DONE\n");
+  return 0;
+}
+
+// CHECK: DONE