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// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/one_shot_event.h"
#include "base/functional/bind.h"
#include "base/memory/raw_ptr.h"
#include "base/run_loop.h"
#include "base/task/single_thread_task_runner.h"
#include "base/test/task_environment.h"
#include "base/test/test_simple_task_runner.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace base {
void Increment(int* i) {
++*i;
}
// |*did_delete_instance| will be set to true upon its destruction.
class RefCountedClass : public base::RefCounted<RefCountedClass> {
public:
explicit RefCountedClass(bool* did_delete_instance)
: did_delete_instance_(did_delete_instance) {
DCHECK(!*did_delete_instance_);
}
RefCountedClass(const RefCountedClass&) = delete;
RefCountedClass& operator=(const RefCountedClass&) = delete;
void PerformTask() { did_perform_task_ = true; }
bool did_perform_task() const { return did_perform_task_; }
private:
friend class base::RefCounted<RefCountedClass>;
~RefCountedClass() { *did_delete_instance_ = true; }
const raw_ptr<bool> did_delete_instance_; // Not owned.
bool did_perform_task_ = false;
};
TEST(OneShotEventTest, RecordsSignal) {
OneShotEvent event;
EXPECT_FALSE(event.is_signaled());
event.Signal();
EXPECT_TRUE(event.is_signaled());
}
TEST(OneShotEventTest, CallsQueueAsDistinctTask) {
OneShotEvent event;
scoped_refptr<base::TestSimpleTaskRunner> runner(
new base::TestSimpleTaskRunner);
int i = 0;
event.Post(FROM_HERE, base::BindOnce(&Increment, &i), runner);
event.Post(FROM_HERE, base::BindOnce(&Increment, &i), runner);
EXPECT_EQ(0U, runner->NumPendingTasks());
event.Signal();
auto pending_tasks = runner->TakePendingTasks();
ASSERT_EQ(2U, pending_tasks.size());
EXPECT_NE(pending_tasks[0].location.line_number(),
pending_tasks[1].location.line_number())
<< "Make sure FROM_HERE is propagated.";
}
TEST(OneShotEventTest, CallsQueue) {
OneShotEvent event;
scoped_refptr<base::TestSimpleTaskRunner> runner(
new base::TestSimpleTaskRunner);
int i = 0;
event.Post(FROM_HERE, base::BindOnce(&Increment, &i), runner);
event.Post(FROM_HERE, base::BindOnce(&Increment, &i), runner);
EXPECT_EQ(0U, runner->NumPendingTasks());
event.Signal();
ASSERT_EQ(2U, runner->NumPendingTasks());
EXPECT_EQ(0, i);
runner->RunPendingTasks();
EXPECT_EQ(2, i);
}
TEST(OneShotEventTest, CallsAfterSignalDontRunInline) {
OneShotEvent event;
scoped_refptr<base::TestSimpleTaskRunner> runner(
new base::TestSimpleTaskRunner);
int i = 0;
event.Signal();
event.Post(FROM_HERE, base::BindOnce(&Increment, &i), runner);
EXPECT_EQ(1U, runner->NumPendingTasks());
EXPECT_EQ(0, i);
runner->RunPendingTasks();
EXPECT_EQ(1, i);
}
TEST(OneShotEventTest, PostDefaultsToCurrentMessageLoop) {
OneShotEvent event;
scoped_refptr<base::TestSimpleTaskRunner> runner(
new base::TestSimpleTaskRunner);
base::test::SingleThreadTaskEnvironment task_environment;
int runner_i = 0;
int loop_i = 0;
event.Post(FROM_HERE, base::BindOnce(&Increment, &runner_i), runner);
event.Post(FROM_HERE, base::BindOnce(&Increment, &loop_i));
event.Signal();
EXPECT_EQ(1U, runner->NumPendingTasks());
EXPECT_EQ(0, runner_i);
runner->RunPendingTasks();
EXPECT_EQ(1, runner_i);
EXPECT_EQ(0, loop_i);
base::RunLoop().RunUntilIdle();
EXPECT_EQ(1, loop_i);
}
void CheckSignaledAndPostIncrement(
OneShotEvent* event,
const scoped_refptr<base::SingleThreadTaskRunner>& runner,
int* i) {
EXPECT_TRUE(event->is_signaled());
event->Post(FROM_HERE, base::BindOnce(&Increment, i), runner);
}
TEST(OneShotEventTest, IsSignaledAndPostsFromCallbackWork) {
OneShotEvent event;
scoped_refptr<base::TestSimpleTaskRunner> runner(
new base::TestSimpleTaskRunner);
int i = 0;
event.Post(FROM_HERE,
base::BindOnce(&CheckSignaledAndPostIncrement, &event, runner, &i),
runner);
EXPECT_EQ(0, i);
event.Signal();
// CheckSignaledAndPostIncrement is queued on |runner|.
EXPECT_EQ(1U, runner->NumPendingTasks());
EXPECT_EQ(0, i);
runner->RunPendingTasks();
// Increment is queued on |runner|.
EXPECT_EQ(1U, runner->NumPendingTasks());
EXPECT_EQ(0, i);
runner->RunPendingTasks();
// Increment has run.
EXPECT_EQ(0U, runner->NumPendingTasks());
EXPECT_EQ(1, i);
}
// Tests that OneShotEvent does not keep references to tasks once OneShotEvent
// Signal()s.
TEST(OneShotEventTest, DropsCallbackRefUponSignalled) {
auto runner = base::MakeRefCounted<base::TestSimpleTaskRunner>();
bool did_delete_instance = false;
OneShotEvent event;
{
auto ref_counted_class =
base::MakeRefCounted<RefCountedClass>(&did_delete_instance);
event.Post(FROM_HERE,
base::BindOnce(&RefCountedClass::PerformTask, ref_counted_class),
runner);
event.Signal();
runner->RunPendingTasks();
EXPECT_TRUE(ref_counted_class->did_perform_task());
}
// Once OneShotEvent doesn't have any queued events, it should have dropped
// all the references to the callbacks it received through Post().
EXPECT_TRUE(did_delete_instance);
}
} // namespace base
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