Comments (1)
Obviously, the test code was flawed (vector
used instead of set
). This passes:
#include <gtest/gtest.h>
#include <chrono>
#include <ranges>
#include <algorithm>
#include <thread>
#include <vector>
#include <set>
#include <async++.h>
TEST(Task, ThreadpoolSchedulerOfSize1IsSingleThreadWithWorkQueue) {
using namespace std::chrono_literals;
async::threadpool_scheduler scheduler{1};
std::set<std::thread::id> threadIds;
std::vector<std::chrono::high_resolution_clock::time_point> startTimes;
constexpr auto INTERVAL = 2s;
auto task = [&] {
startTimes.push_back(std::chrono::high_resolution_clock::now());
threadIds.insert(std::this_thread::get_id());
std::this_thread::sleep_for(INTERVAL);
};
auto firstTask = async::spawn(scheduler, task)
.then(scheduler, task)
.then(scheduler, task)
.then(scheduler, task);
// I expect these to be executed after or in-between sub-tasks of the first
// task
auto secondTask = async::spawn(scheduler, task);
auto thirdTask = async::spawn(scheduler, task);
std::vector<async::task<void>> tasks{};
tasks.push_back(std::move(firstTask));
tasks.push_back(std::move(secondTask));
tasks.push_back(std::move(thirdTask));
async::when_all(tasks.begin(), tasks.end()).wait();
// This fails
EXPECT_EQ(1u, threadIds.size());
// Each task should have been executed around INTERVAL after the last one.
std::vector<std::chrono::duration<double>> startTimesDifferences;
std::ranges::transform(startTimes | std::views::drop(1), startTimes,
std::back_inserter(startTimesDifferences),
std::minus());
for (const auto timeDifference : startTimesDifferences) {
// This succeeds
EXPECT_NEAR(static_cast<double>(INTERVAL.count()), timeDifference.count(),
0.02);
}
}
from asyncplusplus.
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from asyncplusplus.