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// Copyright 2019 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/allocator/partition_allocator/spin_lock.h"
#include "base/threading/platform_thread.h"
#include "base/time/time.h"
#include "base/timer/lap_timer.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "testing/perf/perf_test.h"
namespace base {
namespace {
constexpr int kWarmupRuns = 1;
constexpr TimeDelta kTimeLimit = TimeDelta::FromSeconds(1);
constexpr int kTimeCheckInterval = 100000;
class Spin : public PlatformThread::Delegate {
public:
Spin(subtle::SpinLock* lock, size_t* data)
: lock_(lock), data_(data), should_stop_(false) {}
~Spin() override = default;
void ThreadMain() override {
while (!should_stop_.load(std::memory_order_relaxed)) {
lock_->lock();
(*data_)++;
lock_->unlock();
}
}
void Stop() { should_stop_ = true; }
private:
subtle::SpinLock* lock_;
size_t* data_;
std::atomic<bool> should_stop_;
};
} // namespace
TEST(SpinLockPerfTest, Simple) {
LapTimer timer(kWarmupRuns, kTimeLimit, kTimeCheckInterval);
size_t data = 0;
subtle::SpinLock lock;
do {
lock.lock();
data += 1;
lock.unlock();
timer.NextLap();
} while (!timer.HasTimeLimitExpired());
perf_test::PrintResult("SpinLockPerfTest", " lock()/unlock()", "",
timer.LapsPerSecond(), "runs/s", true);
}
TEST(SpinLockPerfTest, WithCompetingThread) {
LapTimer timer(kWarmupRuns, kTimeLimit, kTimeCheckInterval);
size_t data = 0;
subtle::SpinLock lock;
// Starts a competing thread executing the same loop as this thread.
Spin thread_main(&lock, &data);
PlatformThreadHandle thread_handle;
ASSERT_TRUE(PlatformThread::Create(0, &thread_main, &thread_handle));
do {
lock.lock();
data += 1;
lock.unlock();
timer.NextLap();
} while (!timer.HasTimeLimitExpired());
thread_main.Stop();
PlatformThread::Join(thread_handle);
perf_test::PrintResult("SpinLockPerfTest.WithCompetingThread",
" lock()/unlock()", "", timer.LapsPerSecond(),
"runs/s", true);
}
} // namespace base
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