forked from dolphin-emu/dolphin
92 lines
1.5 KiB
C++
92 lines
1.5 KiB
C++
// Copyright 2014 Dolphin Emulator Project
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// Licensed under GPLv2+
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// Refer to the license.txt file included.
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#include <array>
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#include <thread>
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#include <gtest/gtest.h>
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#include "Common/Flag.h"
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using Common::Flag;
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TEST(Flag, Simple)
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{
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Flag f;
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EXPECT_FALSE(f.IsSet());
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f.Set();
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EXPECT_TRUE(f.IsSet());
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f.Clear();
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EXPECT_FALSE(f.IsSet());
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f.Set(false);
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EXPECT_FALSE(f.IsSet());
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EXPECT_TRUE(f.TestAndSet());
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EXPECT_TRUE(f.TestAndClear());
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Flag f2(true);
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EXPECT_TRUE(f2.IsSet());
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}
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TEST(Flag, MultiThreaded)
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{
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Flag f;
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int count = 0;
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const int ITERATIONS_COUNT = 100000;
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auto setter = [&]() {
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for (int i = 0; i < ITERATIONS_COUNT; ++i)
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{
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while (f.IsSet());
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f.Set();
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}
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};
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auto clearer = [&]() {
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for (int i = 0; i < ITERATIONS_COUNT; ++i)
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{
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while (!f.IsSet());
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count++;
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f.Clear();
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}
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};
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std::thread setter_thread(setter);
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std::thread clearer_thread(clearer);
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setter_thread.join();
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clearer_thread.join();
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EXPECT_EQ(ITERATIONS_COUNT, count);
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}
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TEST(Flag, SpinLock)
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{
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// Uses a flag to implement basic spinlocking using TestAndSet.
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Flag f;
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int count = 0;
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const int ITERATIONS_COUNT = 5000;
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const int THREADS_COUNT = 50;
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auto adder_func = [&]() {
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for (int i = 0; i < ITERATIONS_COUNT; ++i)
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{
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// Acquire the spinlock.
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while (!f.TestAndSet());
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count++;
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f.Clear();
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}
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};
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std::array<std::thread, THREADS_COUNT> threads;
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for (auto& th : threads)
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th = std::thread(adder_func);
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for (auto& th : threads)
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th.join();
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EXPECT_EQ(ITERATIONS_COUNT * THREADS_COUNT, count);
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}
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