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Common::Flag: Add support for TestAndSet + test by implementing basic spinlocks.

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This commit is contained in:
Pierre Bourdon 2014-04-14 01:40:20 +02:00
parent 6bdcbad3e4
commit e24cad0780
2 changed files with 50 additions and 1 deletions
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31
Source/UnitTests/Common/FlagTest.cpp
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@ -2,6 +2,7 @@
// Licensed under GPLv2
// Refer to the license.txt file included.
#include <array>
#include <gtest/gtest.h>
#include <thread>
@ -23,6 +24,9 @@ TEST(Flag, Simple)
f.Set(false);
EXPECT_FALSE(f.IsSet());
EXPECT_TRUE(f.TestAndSet());
EXPECT_TRUE(f.TestAndClear());
Flag f2(true);
EXPECT_TRUE(f2.IsSet());
}
@ -58,3 +62,30 @@ TEST(Flag, MultiThreaded)
EXPECT_EQ(ITERATIONS_COUNT, count);
}
TEST(Flag, SpinLock)
{
// Uses a flag to implement basic spinlocking using TestAndSet.
Flag f;
int count = 0;
const int ITERATIONS_COUNT = 5000;
const int THREADS_COUNT = 50;
auto adder_func = [&]() {
for (int i = 0; i < ITERATIONS_COUNT; ++i)
{
// Acquire the spinlock.
while (!f.TestAndSet());
count++;
f.Clear();
}
};
std::array<std::thread, THREADS_COUNT> threads;
for (auto& th : threads)
th = std::thread(adder_func);
for (auto& th : threads)
th.join();
EXPECT_EQ(ITERATIONS_COUNT * THREADS_COUNT, count);
}