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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
//
// 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 {
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
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