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// Copyright 2019 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/scoped_thread_priority.h"
#include "base/test/gtest_util.h"
#include "base/threading/platform_thread.h"
#include "base/threading/thread.h"
#include "build/build_config.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace base {
namespace {
// Tests in this file invoke an API that tracks state in static variable. They
// can therefore only be invoked once per process.
#define ASSERT_RUNS_ONCE() \
static int num_times_run = 0; \
++num_times_run; \
if (num_times_run > 1) \
ADD_FAILURE() << "This test cannot run multiple times in the same " \
"process.";
static ThreadType kAllThreadTypes[] = {
ThreadType::kRealtimeAudio, ThreadType::kDisplayCritical,
ThreadType::kDefault, ThreadType::kBackground};
static_assert(static_cast<int>(ThreadType::kBackground) == 0,
"kBackground isn't lowest");
static_assert(ThreadType::kRealtimeAudio == ThreadType::kMaxValue,
"kRealtimeAudio isn't highest");
class ScopedThreadPriorityTest : public testing::Test {
protected:
void SetUp() override {
// Ensures the default thread priority is set.
PlatformThread::SetCurrentThreadType(ThreadType::kDefault);
ASSERT_EQ(ThreadPriorityForTest::kNormal,
PlatformThread::GetCurrentThreadPriorityForTest());
}
};
using ScopedThreadPriorityDeathTest = ScopedThreadPriorityTest;
#if BUILDFLAG(IS_WIN)
void FunctionThatBoostsPriorityOnFirstInvoke(
ThreadPriorityForTest expected_priority) {
SCOPED_MAY_LOAD_LIBRARY_AT_BACKGROUND_PRIORITY();
EXPECT_EQ(expected_priority,
PlatformThread::GetCurrentThreadPriorityForTest());
}
void FunctionThatBoostsPriorityOnEveryInvoke() {
SCOPED_MAY_LOAD_LIBRARY_AT_BACKGROUND_PRIORITY_REPEATEDLY();
EXPECT_EQ(base::ThreadPriorityForTest::kNormal,
PlatformThread::GetCurrentThreadPriorityForTest());
}
#endif // BUILDFLAG(IS_WIN)
} // namespace
TEST_F(ScopedThreadPriorityTest, BasicTest) {
for (auto from : kAllThreadTypes) {
if (!PlatformThread::CanChangeThreadType(ThreadType::kDefault, from)) {
continue;
}
for (auto to : kAllThreadTypes) {
// ThreadType::kRealtimeAudio is not a valid |target_thread_type| for
// ScopedBoostPriority.
if (to == ThreadType::kRealtimeAudio) {
continue;
}
Thread thread("ScopedThreadPriorityTest");
thread.StartWithOptions(Thread::Options(from));
thread.WaitUntilThreadStarted();
thread.task_runner()->PostTask(
FROM_HERE,
BindOnce(
[](ThreadType from, ThreadType to) {
EXPECT_EQ(PlatformThread::GetCurrentThreadType(), from);
{
ScopedBoostPriority scoped_boost_priority(to);
bool will_boost_priority =
from < to &&
PlatformThread::CanChangeThreadType(from, to) &&
PlatformThread::CanChangeThreadType(to, from);
EXPECT_EQ(PlatformThread::GetCurrentThreadType(),
will_boost_priority ? to : from);
}
EXPECT_EQ(PlatformThread::GetCurrentThreadType(), from);
},
from, to));
}
}
}
TEST_F(ScopedThreadPriorityDeathTest, NoRealTime) {
EXPECT_CHECK_DEATH({
ScopedBoostPriority scoped_boost_priority(ThreadType::kRealtimeAudio);
});
}
TEST_F(ScopedThreadPriorityTest, WithoutPriorityBoost) {
ASSERT_RUNS_ONCE();
// Validates that a thread at normal priority keep the same priority.
{
SCOPED_MAY_LOAD_LIBRARY_AT_BACKGROUND_PRIORITY();
EXPECT_EQ(ThreadPriorityForTest::kNormal,
PlatformThread::GetCurrentThreadPriorityForTest());
}
EXPECT_EQ(ThreadPriorityForTest::kNormal,
PlatformThread::GetCurrentThreadPriorityForTest());
}
#if BUILDFLAG(IS_WIN)
TEST_F(ScopedThreadPriorityTest, WithPriorityBoost) {
ASSERT_RUNS_ONCE();
// Validates that a thread at background priority is boosted to normal
// priority.
PlatformThread::SetCurrentThreadType(ThreadType::kBackground);
{
SCOPED_MAY_LOAD_LIBRARY_AT_BACKGROUND_PRIORITY();
EXPECT_EQ(ThreadPriorityForTest::kNormal,
PlatformThread::GetCurrentThreadPriorityForTest());
}
EXPECT_EQ(ThreadPriorityForTest::kBackground,
PlatformThread::GetCurrentThreadPriorityForTest());
// Put back the default thread priority.
PlatformThread::SetCurrentThreadType(ThreadType::kDefault);
}
#endif // BUILDFLAG(IS_WIN)
#if BUILDFLAG(IS_WIN)
TEST_F(ScopedThreadPriorityTest, NestedScope) {
ASSERT_RUNS_ONCE();
PlatformThread::SetCurrentThreadType(ThreadType::kBackground);
{
SCOPED_MAY_LOAD_LIBRARY_AT_BACKGROUND_PRIORITY();
EXPECT_EQ(ThreadPriorityForTest::kNormal,
PlatformThread::GetCurrentThreadPriorityForTest());
{
SCOPED_MAY_LOAD_LIBRARY_AT_BACKGROUND_PRIORITY();
EXPECT_EQ(ThreadPriorityForTest::kNormal,
PlatformThread::GetCurrentThreadPriorityForTest());
}
EXPECT_EQ(ThreadPriorityForTest::kNormal,
PlatformThread::GetCurrentThreadPriorityForTest());
}
EXPECT_EQ(ThreadPriorityForTest::kBackground,
PlatformThread::GetCurrentThreadPriorityForTest());
// Put back the default thread priority.
PlatformThread::SetCurrentThreadType(ThreadType::kDefault);
}
#endif // BUILDFLAG(IS_WIN)
#if BUILDFLAG(IS_WIN)
TEST_F(ScopedThreadPriorityTest, FunctionThatBoostsPriorityOnFirstInvoke) {
ASSERT_RUNS_ONCE();
PlatformThread::SetCurrentThreadType(ThreadType::kBackground);
FunctionThatBoostsPriorityOnFirstInvoke(base::ThreadPriorityForTest::kNormal);
FunctionThatBoostsPriorityOnFirstInvoke(
base::ThreadPriorityForTest::kBackground);
// Put back the default thread priority.
PlatformThread::SetCurrentThreadType(ThreadType::kDefault);
}
TEST_F(ScopedThreadPriorityTest, FunctionThatBoostsPriorityOnEveryInvoke) {
PlatformThread::SetCurrentThreadType(ThreadType::kBackground);
FunctionThatBoostsPriorityOnEveryInvoke();
FunctionThatBoostsPriorityOnEveryInvoke();
// Put back the default thread priority.
PlatformThread::SetCurrentThreadType(ThreadType::kDefault);
}
#endif // BUILDFLAG(IS_WIN)
} // namespace base
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