Abseil Common Libraries (C++) (grcp 依赖)
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80 lines
2.2 KiB
80 lines
2.2 KiB
// Copyright 2017 The Abseil Authors. |
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// |
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// Licensed under the Apache License, Version 2.0 (the "License"); |
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// you may not use this file except in compliance with the License. |
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// You may obtain a copy of the License at |
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// |
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// https://www.apache.org/licenses/LICENSE-2.0 |
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// |
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// Unless required by applicable law or agreed to in writing, software |
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// distributed under the License is distributed on an "AS IS" BASIS, |
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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// See the License for the specific language governing permissions and |
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// limitations under the License. |
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#include "absl/synchronization/blocking_counter.h" |
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#include <thread> // NOLINT(build/c++11) |
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#include <vector> |
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#include "gtest/gtest.h" |
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#include "absl/time/clock.h" |
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#include "absl/time/time.h" |
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namespace absl { |
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ABSL_NAMESPACE_BEGIN |
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namespace { |
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void PauseAndDecreaseCounter(BlockingCounter* counter, int* done) { |
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absl::SleepFor(absl::Seconds(1)); |
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*done = 1; |
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counter->DecrementCount(); |
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} |
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TEST(BlockingCounterTest, BasicFunctionality) { |
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// This test verifies that BlockingCounter functions correctly. Starts a |
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// number of threads that just sleep for a second and decrement a counter. |
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// Initialize the counter. |
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const int num_workers = 10; |
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BlockingCounter counter(num_workers); |
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std::vector<std::thread> workers; |
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std::vector<int> done(num_workers, 0); |
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// Start a number of parallel tasks that will just wait for a seconds and |
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// then decrement the count. |
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workers.reserve(num_workers); |
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for (int k = 0; k < num_workers; k++) { |
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workers.emplace_back( |
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[&counter, &done, k] { PauseAndDecreaseCounter(&counter, &done[k]); }); |
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} |
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// Wait for the threads to have all finished. |
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counter.Wait(); |
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// Check that all the workers have completed. |
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for (int k = 0; k < num_workers; k++) { |
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EXPECT_EQ(1, done[k]); |
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} |
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for (std::thread& w : workers) { |
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w.join(); |
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} |
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} |
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TEST(BlockingCounterTest, WaitZeroInitialCount) { |
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BlockingCounter counter(0); |
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counter.Wait(); |
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} |
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#if GTEST_HAS_DEATH_TEST |
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TEST(BlockingCounterTest, WaitNegativeInitialCount) { |
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EXPECT_DEATH(BlockingCounter counter(-1), |
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"BlockingCounter initial_count negative"); |
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} |
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#endif |
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} // namespace |
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ABSL_NAMESPACE_END |
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} // namespace absl
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