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// Copyright 2022 The Pigweed 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 "gtest/gtest.h"
#include "pw_async/test_dispatcher.h"
#include "pw_sync/thread_notification.h"
#include "pw_thread/thread.h"
#include "pw_thread_stl/options.h"
using namespace std::chrono_literals;
namespace pw::async {
// Lambdas can only capture one ptr worth of memory without allocating, so we
// group the data we want to share between tasks and their containing tests
// inside one struct.
struct TestPrimitives {
int count = 0;
sync::ThreadNotification notification;
};
TEST(TestDispatcher, PostTasks) {
TestDispatcher dispatcher;
TestPrimitives tp;
auto inc_count = [&tp]([[maybe_unused]] Context& c) { ++tp.count; };
Task task(inc_count);
dispatcher.PostTask(task);
Task task2(inc_count);
dispatcher.PostTask(task2);
Task task3([&tp]([[maybe_unused]] Context& c) { ++tp.count; });
dispatcher.PostTask(task3);
dispatcher.RunUntilIdle();
dispatcher.RequestStop();
ASSERT_TRUE(tp.count == 3);
}
struct TaskPair {
Task task_a;
Task task_b;
int count = 0;
sync::ThreadNotification notification;
};
TEST(TestDispatcher, DelayedTasks) {
TestDispatcher dispatcher;
TaskPair tp;
Task task0(
[&tp]([[maybe_unused]] Context& c) { tp.count = tp.count * 10 + 4; });
dispatcher.PostDelayedTask(task0, 200ms);
Task task1([&tp]([[maybe_unused]] Context& c) {
tp.count = tp.count * 10 + 1;
c.dispatcher->PostDelayedTask(tp.task_a, 50ms);
c.dispatcher->PostDelayedTask(tp.task_b, 25ms);
});
dispatcher.PostDelayedTask(task1, 100ms);
tp.task_a.SetFunction(
[&tp]([[maybe_unused]] Context& c) { tp.count = tp.count * 10 + 3; });
tp.task_b.SetFunction(
[&tp]([[maybe_unused]] Context& c) { tp.count = tp.count * 10 + 2; });
dispatcher.RunUntilIdle();
dispatcher.RequestStop();
ASSERT_TRUE(tp.count == 1234);
}
TEST(TestDispatcher, CancelTasks) {
TestDispatcher dispatcher;
TestPrimitives tp;
auto inc_count = [&tp]([[maybe_unused]] Context& c) { ++tp.count; };
// This task gets canceled in the last task.
Task task0(inc_count);
dispatcher.PostDelayedTask(task0, 40ms);
// This task gets canceled immediately.
Task task1(inc_count);
dispatcher.PostDelayedTask(task1, 10ms);
ASSERT_TRUE(dispatcher.Cancel(task1));
// This task cancels the first task.
Task cancel_task(
[&task0](Context& c) { ASSERT_TRUE(c.dispatcher->Cancel(task0)); });
dispatcher.PostDelayedTask(cancel_task, 20ms);
dispatcher.RunUntilIdle();
dispatcher.RequestStop();
ASSERT_TRUE(tp.count == 0);
}
// Test RequestStop() from inside task.
TEST(TestDispatcher, RequestStopInsideTask) {
TestDispatcher dispatcher;
TestPrimitives tp;
auto inc_count = [&tp]([[maybe_unused]] Context& c) { ++tp.count; };
// These tasks are never executed and cleaned up in RequestStop().
Task task0(inc_count), task1(inc_count);
dispatcher.PostDelayedTask(task0, 20ms);
dispatcher.PostDelayedTask(task1, 21ms);
Task stop_task([&tp]([[maybe_unused]] Context& c) {
++tp.count;
c.dispatcher->RequestStop();
});
dispatcher.PostTask(stop_task);
dispatcher.RunUntilIdle();
ASSERT_TRUE(tp.count == 1);
}
TEST(TestDispatcher, PeriodicTasks) {
TestDispatcher dispatcher;
TestPrimitives tp;
Task periodic_task([&tp]([[maybe_unused]] Context& c) { ++tp.count; });
dispatcher.SchedulePeriodicTask(periodic_task, 20ms, dispatcher.Now() + 50ms);
// Cancel periodic task after it has run thrice, at +50ms, +70ms, and +90ms.
Task cancel_task(
[&periodic_task](Context& c) { c.dispatcher->Cancel(periodic_task); });
dispatcher.PostDelayedTask(cancel_task, 100ms);
dispatcher.RunUntilIdle();
dispatcher.RequestStop();
ASSERT_TRUE(tp.count == 3);
}
} // namespace pw::async
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