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#include <mbgl/util/async_task.hpp>
#include <mbgl/util/run_loop.hpp>
#include <mbgl/util/default_thread_pool.hpp>
#include <mbgl/actor/actor_ref.hpp>
#include <mbgl/test/util.hpp>
#include <atomic>
#include <future>
#include <vector>
using namespace mbgl::util;
namespace {
class TestWorker {
public:
TestWorker(AsyncTask *async_)
: async(async_) {}
void run() {
for (unsigned i = 0; i < 100000; ++i) {
async->send();
}
}
void runWithCallback(std::function<void()> cb) {
for (unsigned i = 0; i < 100000; ++i) {
async->send();
}
cb();
}
void sync(std::promise<void> barrier) {
barrier.set_value();
}
private:
AsyncTask *async;
};
} // namespace
TEST(AsyncTask, RequestCoalescing) {
RunLoop loop;
unsigned count = 0;
AsyncTask async([&count] { ++count; });
async.send();
async.send();
async.send();
async.send();
async.send();
loop.runOnce();
EXPECT_EQ(count, 1u);
}
TEST(AsyncTask, DestroyShouldNotRunQueue) {
RunLoop loop;
unsigned count = 0;
auto async = std::make_unique<AsyncTask>([&count] { ++count; });
async->send();
async.reset();
EXPECT_EQ(count, 0u);
}
TEST(AsyncTask, DestroyAfterSignaling) {
RunLoop loop;
// We're creating two tasks and signal both of them; the one that gets fired first destroys
// the other one. Make sure that the second one we destroyed doesn't fire.
std::unique_ptr<AsyncTask> task1, task2;
task1 = std::make_unique<AsyncTask>([&] {
task2.reset();
if (!task1) {
FAIL() << "Task was destroyed but invoked anyway";
}
});
task2 = std::make_unique<AsyncTask>([&] {
task1.reset();
if (!task2) {
FAIL() << "Task was destroyed but invoked anyway";
}
});
task1->send();
task2->send();
loop.runOnce();
}
TEST(AsyncTask, RequestCoalescingMultithreaded) {
RunLoop loop;
unsigned count = 0, numThreads = 25;
AsyncTask async([&count] { ++count; });
mbgl::ThreadPool threads(numThreads);
auto mailbox = std::make_shared<mbgl::Mailbox>(threads);
TestWorker worker(&async);
mbgl::ActorRef<TestWorker> workerRef(worker, mailbox);
for (unsigned i = 0; i < numThreads; ++i) {
workerRef.invoke(&TestWorker::run);
}
std::promise<void> barrier;
std::future<void> barrierFuture = barrier.get_future();
workerRef.invoke(&TestWorker::sync, std::move(barrier));
barrierFuture.wait();
loop.runOnce();
EXPECT_EQ(count, 1u);
}
TEST(AsyncTask, ThreadSafety) {
RunLoop loop;
unsigned count = 0, numThreads = 25;
std::atomic_uint completed(numThreads);
AsyncTask async([&count] { ++count; });
mbgl::ThreadPool threads(numThreads);
auto mailbox = std::make_shared<mbgl::Mailbox>(threads);
TestWorker worker(&async);
mbgl::ActorRef<TestWorker> workerRef(worker, mailbox);
for (unsigned i = 0; i < numThreads; ++i) {
// The callback runs on the worker, thus the atomic type.
workerRef.invoke(&TestWorker::runWithCallback, [&] { if (!--completed) loop.stop(); });
}
loop.run();
// We expect here more than 1 but 1 would also be
// a valid result, although very unlikely (I hope).
EXPECT_GT(count, 0u);
}
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