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#include <aocommon/threadpool.h>
#include <boost/test/unit_test.hpp>
#include <set>
#include <vector>
using aocommon::ThreadPool;
BOOST_AUTO_TEST_SUITE(thread_pool)
BOOST_AUTO_TEST_CASE(restart_threads) {
ThreadPool pool;
BOOST_CHECK_EQUAL(pool.NThreads(), 1);
pool.SetNThreads(4);
BOOST_CHECK_EQUAL(pool.NThreads(), 4);
pool.SetNThreads(1);
BOOST_CHECK_EQUAL(pool.NThreads(), 1);
}
BOOST_AUTO_TEST_CASE(single_threaded) {
ThreadPool pool;
pool.SetNThreads(1);
size_t run_count = 0;
std::thread::id executing_thread_id;
auto run = [&](size_t thread_index) {
BOOST_CHECK_EQUAL(thread_index, 0);
++run_count;
executing_thread_id = std::this_thread::get_id();
};
pool.ExecuteInParallel(run);
BOOST_CHECK_EQUAL(run_count, 1);
BOOST_CHECK(executing_thread_id == std::this_thread::get_id());
executing_thread_id = std::thread::id();
pool.ExecuteInParallel(run);
BOOST_CHECK_EQUAL(run_count, 2);
BOOST_CHECK(executing_thread_id == std::this_thread::get_id());
}
BOOST_AUTO_TEST_CASE(multi_threaded) {
ThreadPool pool;
constexpr size_t kNThreads = 10;
pool.SetNThreads(kNThreads);
std::vector<int> run_counts(kNThreads, 0);
std::set<std::thread::id> thread_ids;
std::mutex mutex;
auto run = [&](size_t thread_index) {
std::lock_guard lock(mutex);
thread_ids.insert(std::this_thread::get_id());
++run_counts[thread_index];
};
pool.ExecuteInParallel(run);
const std::vector<int> ref_a(kNThreads, 1);
BOOST_CHECK_EQUAL_COLLECTIONS(run_counts.begin(), run_counts.end(),
ref_a.begin(), ref_a.end());
BOOST_CHECK_EQUAL(thread_ids.size(), kNThreads);
thread_ids.clear();
pool.ExecuteInParallel(run);
const std::vector<int> ref_b(kNThreads, 2);
BOOST_CHECK_EQUAL_COLLECTIONS(run_counts.begin(), run_counts.end(),
ref_b.begin(), ref_b.end());
BOOST_CHECK_EQUAL(thread_ids.size(), kNThreads);
}
BOOST_AUTO_TEST_CASE(non_blocking_single_threaded) {
ThreadPool pool;
pool.SetNThreads(1);
bool is_executed = false;
// With only one thread, the function should never be executed
pool.StartParallelExecution([&](size_t) {
is_executed = true;
while (true)
;
});
BOOST_CHECK(!is_executed);
pool.FinishParallelExecution();
BOOST_CHECK(!is_executed);
}
BOOST_AUTO_TEST_CASE(non_blocking_multi_threaded) {
ThreadPool pool;
constexpr size_t kNThreads = 10;
pool.SetNThreads(kNThreads);
std::vector<int> run_counts(kNThreads, 0);
std::set<std::thread::id> thread_ids;
std::mutex mutex;
auto run = [&](size_t thread_index) {
std::lock_guard lock(mutex);
thread_ids.insert(std::this_thread::get_id());
++run_counts[thread_index];
};
pool.StartParallelExecution(run);
pool.FinishParallelExecution();
std::vector<int> ref_a(kNThreads, 1);
ref_a[0] = 0;
BOOST_CHECK_EQUAL_COLLECTIONS(run_counts.begin(), run_counts.end(),
ref_a.begin(), ref_a.end());
BOOST_CHECK_EQUAL(thread_ids.size(), kNThreads - 1);
thread_ids.clear();
pool.StartParallelExecution(run);
pool.FinishParallelExecution();
std::vector<int> ref_b(kNThreads, 2);
ref_b[0] = 0;
BOOST_CHECK_EQUAL_COLLECTIONS(run_counts.begin(), run_counts.end(),
ref_b.begin(), ref_b.end());
BOOST_CHECK_EQUAL(thread_ids.size(), kNThreads - 1);
}
BOOST_AUTO_TEST_SUITE_END()
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