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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/threading/thread.h"
#include <vector>
#include "base/bind.h"
#include "base/message_loop/message_loop.h"
#include "base/third_party/dynamic_annotations/dynamic_annotations.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "testing/platform_test.h"
using base::Thread;
typedef PlatformTest ThreadTest;
namespace {
void ToggleValue(bool* value) {
ANNOTATE_BENIGN_RACE(value, "Test-only data race on boolean "
"in base/thread_unittest");
*value = !*value;
}
class SleepInsideInitThread : public Thread {
public:
SleepInsideInitThread() : Thread("none") {
init_called_ = false;
ANNOTATE_BENIGN_RACE(
this, "Benign test-only data race on vptr - http://crbug.com/98219");
}
~SleepInsideInitThread() override { Stop(); }
void Init() override {
base::PlatformThread::Sleep(base::TimeDelta::FromMilliseconds(500));
init_called_ = true;
}
bool InitCalled() { return init_called_; }
private:
bool init_called_;
};
enum ThreadEvent {
// Thread::Init() was called.
THREAD_EVENT_INIT = 0,
// The MessageLoop for the thread was deleted.
THREAD_EVENT_MESSAGE_LOOP_DESTROYED,
// Thread::CleanUp() was called.
THREAD_EVENT_CLEANUP,
// Keep at end of list.
THREAD_NUM_EVENTS
};
typedef std::vector<ThreadEvent> EventList;
class CaptureToEventList : public Thread {
public:
// This Thread pushes events into the vector |event_list| to show
// the order they occured in. |event_list| must remain valid for the
// lifetime of this thread.
explicit CaptureToEventList(EventList* event_list)
: Thread("none"),
event_list_(event_list) {
}
~CaptureToEventList() override { Stop(); }
void Init() override { event_list_->push_back(THREAD_EVENT_INIT); }
void CleanUp() override { event_list_->push_back(THREAD_EVENT_CLEANUP); }
private:
EventList* event_list_;
};
// Observer that writes a value into |event_list| when a message loop has been
// destroyed.
class CapturingDestructionObserver
: public base::MessageLoop::DestructionObserver {
public:
// |event_list| must remain valid throughout the observer's lifetime.
explicit CapturingDestructionObserver(EventList* event_list)
: event_list_(event_list) {
}
// DestructionObserver implementation:
void WillDestroyCurrentMessageLoop() override {
event_list_->push_back(THREAD_EVENT_MESSAGE_LOOP_DESTROYED);
event_list_ = NULL;
}
private:
EventList* event_list_;
};
// Task that adds a destruction observer to the current message loop.
void RegisterDestructionObserver(
base::MessageLoop::DestructionObserver* observer) {
base::MessageLoop::current()->AddDestructionObserver(observer);
}
} // namespace
TEST_F(ThreadTest, Restart) {
Thread a("Restart");
a.Stop();
EXPECT_FALSE(a.message_loop());
EXPECT_FALSE(a.IsRunning());
EXPECT_TRUE(a.Start());
EXPECT_TRUE(a.message_loop());
EXPECT_TRUE(a.IsRunning());
a.Stop();
EXPECT_FALSE(a.message_loop());
EXPECT_FALSE(a.IsRunning());
EXPECT_TRUE(a.Start());
EXPECT_TRUE(a.message_loop());
EXPECT_TRUE(a.IsRunning());
a.Stop();
EXPECT_FALSE(a.message_loop());
EXPECT_FALSE(a.IsRunning());
a.Stop();
EXPECT_FALSE(a.message_loop());
EXPECT_FALSE(a.IsRunning());
}
TEST_F(ThreadTest, StartWithOptions_StackSize) {
Thread a("StartWithStackSize");
// Ensure that the thread can work with only 12 kb and still process a
// message.
Thread::Options options;
options.stack_size = 12*1024;
EXPECT_TRUE(a.StartWithOptions(options));
EXPECT_TRUE(a.message_loop());
EXPECT_TRUE(a.IsRunning());
bool was_invoked = false;
a.message_loop()->PostTask(FROM_HERE, base::Bind(&ToggleValue, &was_invoked));
// wait for the task to run (we could use a kernel event here
// instead to avoid busy waiting, but this is sufficient for
// testing purposes).
for (int i = 100; i >= 0 && !was_invoked; --i) {
base::PlatformThread::Sleep(base::TimeDelta::FromMilliseconds(10));
}
EXPECT_TRUE(was_invoked);
}
TEST_F(ThreadTest, TwoTasks) {
bool was_invoked = false;
{
Thread a("TwoTasks");
EXPECT_TRUE(a.Start());
EXPECT_TRUE(a.message_loop());
// Test that all events are dispatched before the Thread object is
// destroyed. We do this by dispatching a sleep event before the
// event that will toggle our sentinel value.
a.message_loop()->PostTask(
FROM_HERE,
base::Bind(
static_cast<void (*)(base::TimeDelta)>(
&base::PlatformThread::Sleep),
base::TimeDelta::FromMilliseconds(20)));
a.message_loop()->PostTask(FROM_HERE, base::Bind(&ToggleValue,
&was_invoked));
}
EXPECT_TRUE(was_invoked);
}
TEST_F(ThreadTest, StopSoon) {
Thread a("StopSoon");
EXPECT_TRUE(a.Start());
EXPECT_TRUE(a.message_loop());
EXPECT_TRUE(a.IsRunning());
a.StopSoon();
a.StopSoon();
a.Stop();
EXPECT_FALSE(a.message_loop());
EXPECT_FALSE(a.IsRunning());
}
TEST_F(ThreadTest, ThreadName) {
Thread a("ThreadName");
EXPECT_TRUE(a.Start());
EXPECT_EQ("ThreadName", a.thread_name());
}
// Make sure we can't use a thread between Start() and Init().
TEST_F(ThreadTest, SleepInsideInit) {
SleepInsideInitThread t;
EXPECT_FALSE(t.InitCalled());
t.Start();
EXPECT_TRUE(t.InitCalled());
}
// Make sure that the destruction sequence is:
//
// (1) Thread::CleanUp()
// (2) MessageLoop::~MessageLoop()
// MessageLoop::DestructionObservers called.
TEST_F(ThreadTest, CleanUp) {
EventList captured_events;
CapturingDestructionObserver loop_destruction_observer(&captured_events);
{
// Start a thread which writes its event into |captured_events|.
CaptureToEventList t(&captured_events);
EXPECT_TRUE(t.Start());
EXPECT_TRUE(t.message_loop());
EXPECT_TRUE(t.IsRunning());
// Register an observer that writes into |captured_events| once the
// thread's message loop is destroyed.
t.message_loop()->PostTask(
FROM_HERE, base::Bind(&RegisterDestructionObserver,
base::Unretained(&loop_destruction_observer)));
// Upon leaving this scope, the thread is deleted.
}
// Check the order of events during shutdown.
ASSERT_EQ(static_cast<size_t>(THREAD_NUM_EVENTS), captured_events.size());
EXPECT_EQ(THREAD_EVENT_INIT, captured_events[0]);
EXPECT_EQ(THREAD_EVENT_CLEANUP, captured_events[1]);
EXPECT_EQ(THREAD_EVENT_MESSAGE_LOOP_DESTROYED, captured_events[2]);
}
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