| // 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 |
| // |
| // https://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 <thread> // NOLINT(build/c++11) |
| #include <vector> |
| |
| #include "gtest/gtest.h" |
| #include "absl/time/clock.h" |
| #include "absl/time/time.h" |
| |
| namespace absl { |
| ABSL_NAMESPACE_BEGIN |
| 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 |
| ABSL_NAMESPACE_END |
| } // namespace absl |