Changes imported from Abseil "staging" branch:

  - 5d8235b05f4ea2b33a138712f463a30b6ae75719 Incorporate PR https://github.com/abseil/abseil-cpp/pull/... by Xiaoyi Zhang <zhangxy@google.com>
  - f2bc653acdaa983aa2765693476c17cd1142d59b Run the StrSplit WorksWithLargeStrings test in all configs. by Matt Armstrong <marmstrong@google.com>
  - 43aed1ea7dffcd656e1916c2d5637650fc3a8de3 Incorporate PR https://github.com/abseil/abseil-cpp/pull/... by Xiaoyi Zhang <zhangxy@google.com>
  - d58511d60904c7090e44638339ba63b97ca96f1a Add a new simple Mutex lifetime test, to be extended later. by Greg Falcon <gfalcon@google.com>
  - db5c86c186c09ad57963bcbd2b6182f62bce8ed0 Actually use the exception in TestCheckerAtCountdown by Jon Cohen <cohenjon@google.com>
  - 29c01a72b62d9a4b90f9bd935e3575adbafd85ed Use factories instead of explicitly passing pointers to T... by Jon Cohen <cohenjon@google.com>
  - 54d5526ee6ab7784992845f6e6e2c7d48ba008a5 Fix uint128 ostream operator and improve ostream test. by Alex Strelnikov <strel@google.com>
  - 4e49abe7e569cf6bd0eae95ce2b2fe2faa051fa2 Fix documentation: strings::PairFormatter -> absl::PairFo... by Derek Mauro <dmauro@google.com>
  - 4044297f0e1a8a6c6ae3f781a65080e0d57c6751 Cut the memory used by the StrSplit WorksWithLargeStrings... by Jorg Brown <jorg@google.com>

GitOrigin-RevId: 5d8235b05f4ea2b33a138712f463a30b6ae75719
Change-Id: Ib6b6b0161c26e5326b53a126454754e33678eefc

2 files changed, 111 insertions, 0 deletions

diff --git a/absl/synchronization/BUILD.bazel b/absl/synchronization/BUILD.bazel
index 4faf62d..5e190c5 100644
--- a/absl/synchronization/BUILD.bazel
+++ b/absl/synchronization/BUILD.bazel
@@ -190,3 +190,19 @@ cc_test(
         "@com_google_googletest//:gtest_main",
     ],
 )
+
+cc_test(
+    name = "lifetime_test",
+    srcs = [
+        "lifetime_test.cc",
+    ],
+    copts = ABSL_TEST_COPTS,
+    linkopts = select({
+        "//absl:windows": [],
+        "//conditions:default": ["-pthread"],
+    }),
+    deps = [
+        ":synchronization",
+        "//absl/base",
+    ],
+)
diff --git a/absl/synchronization/lifetime_test.cc b/absl/synchronization/lifetime_test.cc
new file mode 100644
index 0000000..6aea60e
--- /dev/null
+++ b/absl/synchronization/lifetime_test.cc
@@ -0,0 +1,95 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <cstdlib>
+#include <thread>  // NOLINT(build/c++11), Abseil test
+#include <type_traits>
+
+#include "absl/base/attributes.h"
+#include "absl/base/internal/raw_logging.h"
+#include "absl/synchronization/mutex.h"
+#include "absl/synchronization/notification.h"
+
+namespace {
+
+// A two-threaded test which checks that Mutex, CondVar, and Notification have
+// correct basic functionality.  The intent is to establish that they
+// function correctly in various phases of construction and destruction.
+//
+// Thread one acquires a lock on 'mutex', wakes thread two via 'notification',
+// then waits for 'state' to be set, as signalled by 'condvar'.
+//
+// Thread two waits on 'notification', then sets 'state' inside the 'mutex',
+// signalling the change via 'condvar'.
+//
+// These tests use ABSL_RAW_CHECK to validate invariants, rather than EXPECT or
+// ASSERT from gUnit, because we need to invoke them during global destructors,
+// when gUnit teardown would have already begun.
+void ThreadOne(absl::Mutex* mutex, absl::CondVar* condvar,
+               absl::Notification* notification, bool* state) {
+  // Test that the notification is in a valid initial state.
+  ABSL_RAW_CHECK(!notification->HasBeenNotified(), "invalid Notification");
+  ABSL_RAW_CHECK(*state == false, "*state not initialized");
+
+  {
+    absl::MutexLock lock(mutex);
+
+    notification->Notify();
+    ABSL_RAW_CHECK(notification->HasBeenNotified(), "invalid Notification");
+
+    while (*state == false) {
+      condvar->Wait(mutex);
+    }
+  }
+}
+
+void ThreadTwo(absl::Mutex* mutex, absl::CondVar* condvar,
+               absl::Notification* notification, bool* state) {
+  ABSL_RAW_CHECK(*state == false, "*state not initialized");
+
+  // Wake thread one
+  notification->WaitForNotification();
+  ABSL_RAW_CHECK(notification->HasBeenNotified(), "invalid Notification");
+  {
+    absl::MutexLock lock(mutex);
+    *state = true;
+    condvar->Signal();
+  }
+}
+
+// Launch thread 1 and thread 2, and block on their completion.
+void RunTests(absl::Mutex* mutex, absl::CondVar* condvar,
+              absl::Notification* notification) {
+  bool state = false;
+  std::thread thread_one(ThreadOne, mutex, condvar, notification, &state);
+  std::thread thread_two(ThreadTwo, mutex, condvar, notification, &state);
+  thread_one.join();
+  thread_two.join();
+}
+
+void TestLocals() {
+  absl::Mutex mutex;
+  absl::CondVar condvar;
+  absl::Notification notification;
+  RunTests(&mutex, &condvar, &notification);
+}
+
+}  // namespace
+
+int main() {
+  TestLocals();
+  // Explicitly call exit(0) here, to make it clear that we intend for the
+  // above global object destructors to run.
+  std::exit(0);
+}