1 files changed, 41 insertions, 0 deletions

diff --git a/absl/synchronization/lifetime_test.cc b/absl/synchronization/lifetime_test.cc
index 6aea60e1362f..a3e2701f9208 100644
--- a/absl/synchronization/lifetime_test.cc
+++ b/absl/synchronization/lifetime_test.cc
@@ -69,8 +69,22 @@ void ThreadTwo(absl::Mutex* mutex, absl::CondVar* condvar,
 }
 
 // Launch thread 1 and thread 2, and block on their completion.
+// If any of 'mutex', 'condvar', or 'notification' is nullptr, use a locally
+// constructed instance instead.
 void RunTests(absl::Mutex* mutex, absl::CondVar* condvar,
               absl::Notification* notification) {
+  absl::Mutex default_mutex;
+  absl::CondVar default_condvar;
+  absl::Notification default_notification;
+  if (!mutex) {
+    mutex = &default_mutex;
+  }
+  if (!condvar) {
+    condvar = &default_condvar;
+  }
+  if (!notification) {
+    notification = &default_notification;
+  }
   bool state = false;
   std::thread thread_one(ThreadOne, mutex, condvar, notification, &state);
   std::thread thread_two(ThreadTwo, mutex, condvar, notification, &state);
@@ -85,6 +99,33 @@ void TestLocals() {
   RunTests(&mutex, &condvar, &notification);
 }
 
+// Global variables during start and termination
+//
+// In a translation unit, static storage duration variables are initialized in
+// the order of their definitions, and destroyed in the reverse order of their
+// definitions.  We can use this to arrange for tests to be run on these objects
+// before they are created, and after they are destroyed.
+
+class ConstructorTestRunner {
+ public:
+  ConstructorTestRunner(absl::Mutex* mutex, absl::CondVar* condvar,
+                        absl::Notification* notification) {
+    RunTests(mutex, condvar, notification);
+  }
+};
+
+class DestructorTestRunner {
+ public:
+  DestructorTestRunner(absl::Mutex* mutex, absl::CondVar* condvar,
+                       absl::Notification* notification)
+      : mutex_(mutex), condvar_(condvar), notification_(notification) {}
+  ~DestructorTestRunner() { RunTests(mutex_, condvar_, notification_); }
+ private:
+  absl::Mutex* mutex_;
+  absl::CondVar* condvar_;
+  absl::Notification* notification_;
+};
+
 }  // namespace
 
 int main() {