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/*
Copyright 2018 Google Inc. All Rights Reserved.
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 "geometrical_acoustics/parallel_for.h"
#include <array>
#include <atomic>
#include <condition_variable>
#include <mutex>
#include "third_party/googletest/googletest/include/gtest/gtest.h"
namespace vraudio {
namespace {
// Tests multi-threaded increment of a single variable, using increasing numbers
// of threads.
TEST(ParallelForTest, IncreasingThreadCounts) {
const size_t kNumIterations = 1000;
for (unsigned int num_threads = 1; num_threads < 16; ++num_threads) {
std::mutex mutex;
std::condition_variable condition_variable;
size_t index = 0;
ParallelFor(num_threads, kNumIterations, [&](const size_t i) {
std::unique_lock<std::mutex> lock(mutex);
while (i != index) {
condition_variable.wait(lock);
}
++index;
condition_variable.notify_all();
});
EXPECT_EQ(kNumIterations, index);
}
}
// Tests recursive use of ParallelFor().
TEST(ParallelForTest, RecursiveParallelFor) {
std::atomic<int> counter(0);
ParallelFor(16U, 16, [&](const size_t i) {
ParallelFor(16U, 16, [&](const size_t j) {
for (int k = 0; k < 16; ++k) {
++counter;
}
});
});
EXPECT_EQ(16 * 16 * 16, counter.load());
}
} // namespace
} // namespace vraudio
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