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// Copyright 2012 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/threading/platform_thread.h"
#include <stddef.h>
#include <array>
#include "base/compiler_specific.h"
#include "base/process/process.h"
#include "base/synchronization/waitable_event.h"
#include "base/test/scoped_feature_list.h"
#include "base/threading/thread.h"
#include "base/threading/threading_features.h"
#include "build/blink_buildflags.h"
#include "build/build_config.h"
#include "testing/gtest/include/gtest/gtest.h"
#if BUILDFLAG(IS_POSIX)
#include "base/threading/platform_thread_internal_posix.h"
#elif BUILDFLAG(IS_WIN)
#include <windows.h>
#include "base/threading/platform_thread_win.h"
#endif
#if BUILDFLAG(IS_APPLE)
#include <mach/mach.h>
#include <mach/mach_time.h>
#include <mach/thread_policy.h>
#include "base/mac/mac_util.h"
#include "base/metrics/field_trial_params.h"
#include "base/time/time.h"
#endif
#if BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS)
#include <pthread.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#endif
namespace base {
// Trivial tests that thread runs and doesn't crash on create, join, or detach -
namespace {
class TrivialThread : public PlatformThread::Delegate {
public:
TrivialThread()
: run_event_(WaitableEvent::ResetPolicy::MANUAL,
WaitableEvent::InitialState::NOT_SIGNALED) {}
TrivialThread(const TrivialThread&) = delete;
TrivialThread& operator=(const TrivialThread&) = delete;
void ThreadMain() override { run_event_.Signal(); }
WaitableEvent& run_event() { return run_event_; }
private:
WaitableEvent run_event_;
};
} // namespace
TEST(PlatformThreadTest, TrivialJoin) {
TrivialThread thread;
PlatformThreadHandle handle;
ASSERT_FALSE(thread.run_event().IsSignaled());
ASSERT_TRUE(PlatformThread::Create(0, &thread, &handle));
PlatformThread::Join(handle);
ASSERT_TRUE(thread.run_event().IsSignaled());
}
TEST(PlatformThreadTest, TrivialJoinTimesTen) {
std::array<TrivialThread, 10> thread;
std::array<PlatformThreadHandle, std::size(thread)> handle;
for (auto& n : thread) {
ASSERT_FALSE(n.run_event().IsSignaled());
}
for (size_t n = 0; n < std::size(thread); n++) {
ASSERT_TRUE(PlatformThread::Create(0, &thread[n], &handle[n]));
}
for (auto n : handle) {
PlatformThread::Join(n);
}
for (auto& n : thread) {
ASSERT_TRUE(n.run_event().IsSignaled());
}
}
// The following detach tests are by nature racy. The run_event approximates the
// end and termination of the thread, but threads could persist shortly after
// the test completes.
TEST(PlatformThreadTest, TrivialDetach) {
TrivialThread thread;
PlatformThreadHandle handle;
ASSERT_FALSE(thread.run_event().IsSignaled());
ASSERT_TRUE(PlatformThread::Create(0, &thread, &handle));
PlatformThread::Detach(handle);
thread.run_event().Wait();
}
TEST(PlatformThreadTest, TrivialDetachTimesTen) {
std::array<TrivialThread, 10> thread;
std::array<PlatformThreadHandle, std::size(thread)> handle;
for (auto& n : thread) {
ASSERT_FALSE(n.run_event().IsSignaled());
}
for (size_t n = 0; n < std::size(thread); n++) {
ASSERT_TRUE(PlatformThread::Create(0, &thread[n], &handle[n]));
PlatformThread::Detach(handle[n]);
}
for (auto& n : thread) {
n.run_event().Wait();
}
}
// Tests of basic thread functions ---------------------------------------------
namespace {
class FunctionTestThread : public PlatformThread::Delegate {
public:
FunctionTestThread()
: thread_id_(kInvalidThreadId),
termination_ready_(WaitableEvent::ResetPolicy::MANUAL,
WaitableEvent::InitialState::NOT_SIGNALED),
terminate_thread_(WaitableEvent::ResetPolicy::MANUAL,
WaitableEvent::InitialState::NOT_SIGNALED) {}
FunctionTestThread(const FunctionTestThread&) = delete;
FunctionTestThread& operator=(const FunctionTestThread&) = delete;
~FunctionTestThread() override {
EXPECT_TRUE(terminate_thread_.IsSignaled())
<< "Need to mark thread for termination and join the underlying thread "
<< "before destroying a FunctionTestThread as it owns the "
<< "WaitableEvent blocking the underlying thread's main.";
}
// Grabs |thread_id_|, runs an optional test on that thread, signals
// |termination_ready_|, and then waits for |terminate_thread_| to be
// signaled before exiting.
void ThreadMain() override {
thread_id_ = PlatformThread::CurrentId();
EXPECT_NE(thread_id_, kInvalidThreadId);
// Make sure that the thread ID is the same across calls.
EXPECT_EQ(thread_id_, PlatformThread::CurrentId());
// Run extra tests.
RunTest();
termination_ready_.Signal();
terminate_thread_.Wait();
done_ = true;
}
PlatformThreadId thread_id() const {
EXPECT_TRUE(termination_ready_.IsSignaled()) << "Thread ID still unknown";
return thread_id_;
}
bool IsRunning() const { return termination_ready_.IsSignaled() && !done_; }
// Blocks until this thread is started and ready to be terminated.
void WaitForTerminationReady() { termination_ready_.Wait(); }
// Marks this thread for termination (callers must then join this thread to be
// guaranteed of termination).
void MarkForTermination() { terminate_thread_.Signal(); }
private:
// Runs an optional test on the newly created thread.
virtual void RunTest() {}
PlatformThreadId thread_id_;
mutable WaitableEvent termination_ready_;
WaitableEvent terminate_thread_;
bool done_ = false;
};
} // namespace
TEST(PlatformThreadTest, Function) {
PlatformThreadId main_thread_id = PlatformThread::CurrentId();
FunctionTestThread thread;
PlatformThreadHandle handle;
ASSERT_FALSE(thread.IsRunning());
ASSERT_TRUE(PlatformThread::Create(0, &thread, &handle));
thread.WaitForTerminationReady();
ASSERT_TRUE(thread.IsRunning());
EXPECT_NE(thread.thread_id(), main_thread_id);
thread.MarkForTermination();
PlatformThread::Join(handle);
ASSERT_FALSE(thread.IsRunning());
// Make sure that the thread ID is the same across calls.
EXPECT_EQ(main_thread_id, PlatformThread::CurrentId());
}
TEST(PlatformThreadTest, FunctionTimesTen) {
PlatformThreadId main_thread_id = PlatformThread::CurrentId();
std::array<FunctionTestThread, 10> thread;
std::array<PlatformThreadHandle, std::size(thread)> handle;
for (const auto& n : thread) {
ASSERT_FALSE(n.IsRunning());
}
for (size_t n = 0; n < std::size(thread); n++) {
ASSERT_TRUE(PlatformThread::Create(0, &thread[n], &handle[n]));
}
for (auto& n : thread) {
n.WaitForTerminationReady();
}
for (size_t n = 0; n < std::size(thread); n++) {
ASSERT_TRUE(thread[n].IsRunning());
EXPECT_NE(thread[n].thread_id(), main_thread_id);
// Make sure no two threads get the same ID.
for (size_t i = 0; i < n; ++i) {
EXPECT_NE(thread[i].thread_id(), thread[n].thread_id());
}
}
for (auto& n : thread) {
n.MarkForTermination();
}
for (auto n : handle) {
PlatformThread::Join(n);
}
for (const auto& n : thread) {
ASSERT_FALSE(n.IsRunning());
}
// Make sure that the thread ID is the same across calls.
EXPECT_EQ(main_thread_id, PlatformThread::CurrentId());
}
namespace {
constexpr ThreadType kAllThreadTypes[] = {
ThreadType::kRealtimeAudio, ThreadType::kInteractive,
ThreadType::kDisplayCritical, ThreadType::kDefault,
ThreadType::kUtility, ThreadType::kBackground};
class ThreadTypeTestThread : public FunctionTestThread {
public:
explicit ThreadTypeTestThread(ThreadType from, ThreadType to)
: from_(from), to_(to) {}
ThreadTypeTestThread(const ThreadTypeTestThread&) = delete;
ThreadTypeTestThread& operator=(const ThreadTypeTestThread&) = delete;
~ThreadTypeTestThread() override = default;
private:
void RunTest() override {
EXPECT_EQ(PlatformThread::GetCurrentThreadType(), ThreadType::kDefault);
PlatformThread::SetCurrentThreadType(from_);
EXPECT_EQ(PlatformThread::GetCurrentThreadType(), from_);
PlatformThread::SetCurrentThreadType(to_);
EXPECT_EQ(PlatformThread::GetCurrentThreadType(), to_);
}
const ThreadType from_;
const ThreadType to_;
};
class ThreadPriorityTestThread : public FunctionTestThread {
public:
ThreadPriorityTestThread(ThreadType thread_type,
ThreadPriorityForTest priority)
: thread_type_(thread_type), priority(priority) {}
private:
void RunTest() override {
testing::Message message;
message << "thread_type: " << static_cast<int>(thread_type_);
SCOPED_TRACE(message);
EXPECT_EQ(PlatformThread::GetCurrentThreadType(), ThreadType::kDefault);
PlatformThread::SetCurrentThreadType(thread_type_);
EXPECT_EQ(PlatformThread::GetCurrentThreadType(), thread_type_);
if (PlatformThread::CanChangeThreadType(ThreadType::kDefault,
thread_type_)) {
EXPECT_EQ(PlatformThread::GetCurrentThreadPriorityForTest(), priority);
}
}
const ThreadType thread_type_;
const ThreadPriorityForTest priority;
};
void TestSetCurrentThreadType() {
for (auto from : kAllThreadTypes) {
if (!PlatformThread::CanChangeThreadType(ThreadType::kDefault, from)) {
continue;
}
for (auto to : kAllThreadTypes) {
ThreadTypeTestThread thread(from, to);
PlatformThreadHandle handle;
ASSERT_FALSE(thread.IsRunning());
ASSERT_TRUE(PlatformThread::Create(0, &thread, &handle));
thread.WaitForTerminationReady();
ASSERT_TRUE(thread.IsRunning());
thread.MarkForTermination();
PlatformThread::Join(handle);
ASSERT_FALSE(thread.IsRunning());
}
}
}
void TestPriorityResultingFromThreadType(ThreadType thread_type,
ThreadPriorityForTest priority) {
ThreadPriorityTestThread thread(thread_type, priority);
PlatformThreadHandle handle;
ASSERT_FALSE(thread.IsRunning());
ASSERT_TRUE(PlatformThread::Create(0, &thread, &handle));
thread.WaitForTerminationReady();
ASSERT_TRUE(thread.IsRunning());
thread.MarkForTermination();
PlatformThread::Join(handle);
ASSERT_FALSE(thread.IsRunning());
}
} // namespace
// Test changing a created thread's type.
TEST(PlatformThreadTest, SetCurrentThreadType) {
TestSetCurrentThreadType();
}
#if BUILDFLAG(IS_WIN)
// Test changing a created thread's priority in an IDLE_PRIORITY_CLASS process
// (regression test for https://crbug.com/901483).
TEST(PlatformThreadTest,
SetCurrentThreadTypeWithThreadModeBackgroundIdleProcess) {
::SetPriorityClass(Process::Current().Handle(), IDLE_PRIORITY_CLASS);
TestSetCurrentThreadType();
::SetPriorityClass(Process::Current().Handle(), NORMAL_PRIORITY_CLASS);
}
#endif // BUILDFLAG(IS_WIN)
// Ideally PlatformThread::CanChangeThreadType() would be true on all
// platforms for all priorities. This not being the case. This test documents
// and hardcodes what we know. Please inform scheduler-dev@chromium.org if this
// proprerty changes for a given platform.
TEST(PlatformThreadTest, CanChangeThreadType) {
#if BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS)
// On Ubuntu, RLIMIT_NICE and RLIMIT_RTPRIO are 0 by default, so we won't be
// able to increase priority to any level unless we are root (euid == 0).
bool kCanIncreasePriority = false;
if (geteuid() == 0) {
kCanIncreasePriority = true;
}
#else
constexpr bool kCanIncreasePriority = true;
#endif
for (auto type : kAllThreadTypes) {
EXPECT_TRUE(PlatformThread::CanChangeThreadType(type, type));
}
#if BUILDFLAG(IS_FUCHSIA)
EXPECT_FALSE(PlatformThread::CanChangeThreadType(ThreadType::kBackground,
ThreadType::kUtility));
EXPECT_FALSE(PlatformThread::CanChangeThreadType(ThreadType::kBackground,
ThreadType::kDefault));
EXPECT_FALSE(PlatformThread::CanChangeThreadType(ThreadType::kDefault,
ThreadType::kBackground));
#else
EXPECT_EQ(PlatformThread::CanChangeThreadType(ThreadType::kBackground,
ThreadType::kUtility),
kCanIncreasePriority);
EXPECT_EQ(PlatformThread::CanChangeThreadType(ThreadType::kBackground,
ThreadType::kDefault),
kCanIncreasePriority);
EXPECT_TRUE(PlatformThread::CanChangeThreadType(ThreadType::kDefault,
ThreadType::kBackground));
#endif
EXPECT_EQ(PlatformThread::CanChangeThreadType(ThreadType::kBackground,
ThreadType::kDisplayCritical),
kCanIncreasePriority);
EXPECT_EQ(PlatformThread::CanChangeThreadType(ThreadType::kBackground,
ThreadType::kRealtimeAudio),
kCanIncreasePriority);
#if BUILDFLAG(IS_FUCHSIA)
EXPECT_FALSE(PlatformThread::CanChangeThreadType(ThreadType::kDisplayCritical,
ThreadType::kBackground));
EXPECT_FALSE(PlatformThread::CanChangeThreadType(ThreadType::kRealtimeAudio,
ThreadType::kBackground));
#else
EXPECT_TRUE(PlatformThread::CanChangeThreadType(ThreadType::kDisplayCritical,
ThreadType::kBackground));
EXPECT_TRUE(PlatformThread::CanChangeThreadType(ThreadType::kRealtimeAudio,
ThreadType::kBackground));
#endif
}
TEST(PlatformThreadTest, SetCurrentThreadTypeTest) {
TestPriorityResultingFromThreadType(ThreadType::kBackground,
ThreadPriorityForTest::kBackground);
TestPriorityResultingFromThreadType(ThreadType::kUtility,
ThreadPriorityForTest::kUtility);
TestPriorityResultingFromThreadType(ThreadType::kDefault,
ThreadPriorityForTest::kNormal);
TestPriorityResultingFromThreadType(ThreadType::kDisplayCritical,
ThreadPriorityForTest::kDisplay);
TestPriorityResultingFromThreadType(ThreadType::kRealtimeAudio,
ThreadPriorityForTest::kRealtimeAudio);
#if BUILDFLAG(IS_WIN)
// Currently only on Windows, kInteractive maps to a higher priority than
// kDisplayCritical.
TestPriorityResultingFromThreadType(ThreadType::kInteractive,
ThreadPriorityForTest::kInteractive);
#else
// On other platforms, kInteractive maps to the same priority as
// kDisplayCritical.
TestPriorityResultingFromThreadType(ThreadType::kInteractive,
ThreadPriorityForTest::kDisplay);
#endif
}
TEST(PlatformThreadTest, SetHugeThreadName) {
// Construct an excessively long thread name.
std::string long_name(1024, 'a');
// SetName has no return code, so just verify that implementations
// don't [D]CHECK().
PlatformThread::SetName(long_name);
}
TEST(PlatformThreadTest, GetDefaultThreadStackSize) {
size_t stack_size = PlatformThread::GetDefaultThreadStackSize();
#if BUILDFLAG(IS_IOS)
EXPECT_EQ(1024u * 1024u, stack_size);
#elif BUILDFLAG(IS_WIN) || BUILDFLAG(IS_FUCHSIA) || \
((BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS)) && defined(__GLIBC__) && \
!defined(THREAD_SANITIZER)) || \
(BUILDFLAG(IS_ANDROID) && !defined(ADDRESS_SANITIZER))
EXPECT_EQ(0u, stack_size);
#else
EXPECT_GT(stack_size, 0u);
EXPECT_LT(stack_size, 20u * (1 << 20));
#endif
}
#if BUILDFLAG(IS_APPLE)
namespace {
class RealtimeTestThread : public FunctionTestThread {
public:
explicit RealtimeTestThread(TimeDelta realtime_period)
: realtime_period_(realtime_period) {}
~RealtimeTestThread() override = default;
private:
RealtimeTestThread(const RealtimeTestThread&) = delete;
RealtimeTestThread& operator=(const RealtimeTestThread&) = delete;
TimeDelta GetRealtimePeriod() final { return realtime_period_; }
// Verifies the realtime thead configuration.
void RunTest() override {
EXPECT_EQ(PlatformThread::GetCurrentThreadType(),
ThreadType::kRealtimeAudio);
mach_port_t mach_thread_id = pthread_mach_thread_np(
PlatformThread::CurrentHandle().platform_handle());
// |count| and |get_default| chosen impirically so that
// time_constraints_buffer[0] would store the last constraints that were
// applied.
const int kPolicyCount = 32;
thread_time_constraint_policy_data_t time_constraints_buffer[kPolicyCount];
mach_msg_type_number_t count = kPolicyCount;
boolean_t get_default = 0;
kern_return_t result = thread_policy_get(
mach_thread_id, THREAD_TIME_CONSTRAINT_POLICY,
reinterpret_cast<thread_policy_t>(time_constraints_buffer), &count,
&get_default);
EXPECT_EQ(result, KERN_SUCCESS);
const thread_time_constraint_policy_data_t& time_constraints =
time_constraints_buffer[0];
mach_timebase_info_data_t tb_info;
mach_timebase_info(&tb_info);
if (FeatureList::IsEnabled(kOptimizedRealtimeThreadingMac) &&
!realtime_period_.is_zero()) {
uint32_t abs_realtime_period = saturated_cast<uint32_t>(
realtime_period_.InNanoseconds() *
(static_cast<double>(tb_info.denom) / tb_info.numer));
EXPECT_EQ(time_constraints.period, abs_realtime_period);
EXPECT_EQ(
time_constraints.computation,
static_cast<uint32_t>(abs_realtime_period *
kOptimizedRealtimeThreadingMacBusy.Get()));
EXPECT_EQ(
time_constraints.constraint,
static_cast<uint32_t>(abs_realtime_period *
kOptimizedRealtimeThreadingMacBusyLimit.Get()));
EXPECT_EQ(time_constraints.preemptible,
kOptimizedRealtimeThreadingMacPreemptible.Get());
} else {
// Old-style empirical values.
const double kTimeQuantum = 2.9;
const double kAudioTimeNeeded = 0.75 * kTimeQuantum;
const double kMaxTimeAllowed = 0.85 * kTimeQuantum;
// Get the conversion factor from milliseconds to absolute time
// which is what the time-constraints returns.
double ms_to_abs_time = double(tb_info.denom) / tb_info.numer * 1000000;
EXPECT_EQ(time_constraints.period,
saturated_cast<uint32_t>(kTimeQuantum * ms_to_abs_time));
EXPECT_EQ(time_constraints.computation,
saturated_cast<uint32_t>(kAudioTimeNeeded * ms_to_abs_time));
EXPECT_EQ(time_constraints.constraint,
saturated_cast<uint32_t>(kMaxTimeAllowed * ms_to_abs_time));
EXPECT_FALSE(time_constraints.preemptible);
}
}
const TimeDelta realtime_period_;
};
class RealtimePlatformThreadTest
: public testing::TestWithParam<
std::tuple<bool, FieldTrialParams, TimeDelta>> {
protected:
void VerifyRealtimeConfig(TimeDelta period) {
RealtimeTestThread thread(period);
PlatformThreadHandle handle;
ASSERT_FALSE(thread.IsRunning());
ASSERT_TRUE(PlatformThread::CreateWithType(0, &thread, &handle,
ThreadType::kRealtimeAudio));
thread.WaitForTerminationReady();
ASSERT_TRUE(thread.IsRunning());
thread.MarkForTermination();
PlatformThread::Join(handle);
ASSERT_FALSE(thread.IsRunning());
}
};
TEST_P(RealtimePlatformThreadTest, RealtimeAudioConfigMac) {
test::ScopedFeatureList feature_list;
if (std::get<0>(GetParam())) {
feature_list.InitAndEnableFeatureWithParameters(
kOptimizedRealtimeThreadingMac, std::get<1>(GetParam()));
} else {
feature_list.InitAndDisableFeature(kOptimizedRealtimeThreadingMac);
}
PlatformThread::InitializeFeatures();
VerifyRealtimeConfig(std::get<2>(GetParam()));
}
INSTANTIATE_TEST_SUITE_P(
RealtimePlatformThreadTest,
RealtimePlatformThreadTest,
testing::Combine(
testing::Bool(),
testing::Values(
FieldTrialParams{
{kOptimizedRealtimeThreadingMacPreemptible.name, "true"}},
FieldTrialParams{
{kOptimizedRealtimeThreadingMacPreemptible.name, "false"}},
FieldTrialParams{
{kOptimizedRealtimeThreadingMacBusy.name, "0.5"},
{kOptimizedRealtimeThreadingMacBusyLimit.name, "0.75"}},
FieldTrialParams{
{kOptimizedRealtimeThreadingMacBusy.name, "0.7"},
{kOptimizedRealtimeThreadingMacBusyLimit.name, "0.7"}},
FieldTrialParams{
{kOptimizedRealtimeThreadingMacBusy.name, "0.5"},
{kOptimizedRealtimeThreadingMacBusyLimit.name, "1.0"}}),
testing::Values(TimeDelta(),
Seconds(256.0 / 48000),
Milliseconds(5),
Milliseconds(10),
Seconds(1024.0 / 44100),
Seconds(1024.0 / 16000))));
} // namespace
#endif // BUILDFLAG(IS_APPLE)
#if BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS)
namespace {
bool IsTidCacheCorrect() {
return PlatformThread::CurrentId().raw() == syscall(__NR_gettid);
}
void* CheckTidCacheCorrectWrapper(void*) {
CHECK(IsTidCacheCorrect());
return nullptr;
}
void CreatePthreadToCheckCache() {
pthread_t thread_id;
pthread_create(&thread_id, nullptr, CheckTidCacheCorrectWrapper, nullptr);
pthread_join(thread_id, nullptr);
}
// This test must use raw pthreads and fork() to avoid calls from //base to
// PlatformThread::CurrentId(), as the ordering of calls is important to the
// test.
void TestTidCacheCorrect(bool main_thread_accesses_cache_first) {
EXPECT_TRUE(IsTidCacheCorrect());
CreatePthreadToCheckCache();
// Now fork a process and make sure the TID cache gets correctly updated on
// both its main thread and a child thread.
pid_t child_pid = fork();
ASSERT_GE(child_pid, 0);
if (child_pid == 0) {
// In the child.
if (main_thread_accesses_cache_first) {
if (!IsTidCacheCorrect()) {
_exit(1);
}
}
// Access the TID cache on another thread and make sure the cached value is
// correct.
CreatePthreadToCheckCache();
if (!main_thread_accesses_cache_first) {
// Make sure the main thread's cache is correct even though another thread
// accessed the cache first.
if (!IsTidCacheCorrect()) {
_exit(1);
}
}
_exit(0);
}
int status;
ASSERT_EQ(waitpid(child_pid, &status, 0), child_pid);
ASSERT_TRUE(WIFEXITED(status));
ASSERT_EQ(WEXITSTATUS(status), 0);
}
TEST(PlatformThreadTidCacheTest, MainThreadFirst) {
TestTidCacheCorrect(true);
}
TEST(PlatformThreadTidCacheTest, MainThreadSecond) {
TestTidCacheCorrect(false);
}
} // namespace
#endif // BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS)
} // namespace base
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