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+// 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 "absl/synchronization/blocking_counter.h"
+
+#include <functional>
+#include <memory>
+#include <thread> // NOLINT(build/c++11)
+#include <vector>
+
+#include "gtest/gtest.h"
+#include "absl/time/clock.h"
+
+namespace absl {
+namespace {
+
+void PauseAndDecreaseCounter(BlockingCounter* counter, int* done) {
+ absl::SleepFor(absl::Seconds(1));
+ *done = 1;
+ counter->DecrementCount();
+}
+
+TEST(BlockingCounterTest, BasicFunctionality) {
+ // This test verifies that BlockingCounter functions correctly. Starts a
+ // number of threads that just sleep for a second and decrement a counter.
+
+ // Initialize the counter.
+ const int num_workers = 10;
+ BlockingCounter counter(num_workers);
+
+ std::vector<std::thread> workers;
+ std::vector<int> done(num_workers, 0);
+
+ // Start a number of parallel tasks that will just wait for a seconds and
+ // then decrement the count.
+ workers.reserve(num_workers);
+ for (int k = 0; k < num_workers; k++) {
+ workers.emplace_back(
+ [&counter, &done, k] { PauseAndDecreaseCounter(&counter, &done[k]); });
+ }
+
+ // Wait for the threads to have all finished.
+ counter.Wait();
+
+ // Check that all the workers have completed.
+ for (int k = 0; k < num_workers; k++) {
+ EXPECT_EQ(1, done[k]);
+ }
+
+ for (std::thread& w : workers) {
+ w.join();
+ }
+}
+
+} // namespace
+} // namespace absl