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#include <xenium/seqlock.hpp>
#include <gtest/gtest.h>
#include <thread>
namespace {
struct Foo {
int32_t v1;
float v2;
double v3;
int64_t v4;
Foo& operator++() {
++v1;
++v2;
++v3;
++v4;
return *this;
}
bool verify() const {
return v1 == v2 && v2 == v3 && v3 == v4;
}
bool operator==(const Foo& rhs) const {
return v1 == rhs.v1 && v2 == rhs.v2 && v3 == rhs.v3 && v4 == rhs.v4;
}
};
TEST(SeqLock, load_returns_initial_value)
{
xenium::seqlock<Foo> data{{0, 1, 2, 3}};
Foo expected = {0, 1, 2, 3};
EXPECT_EQ(expected, data.load());
}
TEST(SeqLock, load_returns_previously_stored_value)
{
Foo f = {0, 1, 2, 3};
xenium::seqlock<Foo> data{};
for (int32_t i = 0; i < 4; ++i) {
EXPECT_EQ(i, f.v1);
data.store(f);
EXPECT_EQ(f, data.load());
++f;
}
}
TEST(SeqLock, load_returns_previously_stored_value_with_multiple_slots)
{
Foo f = {0, 1, 2, 3};
xenium::seqlock<Foo, xenium::policy::slots<8>> data{};
for (int32_t i = 0; i < 8; ++i) {
EXPECT_EQ(i, f.v1);
data.store(f);
EXPECT_EQ(f, data.load());
++f;
}
}
TEST(SeqLock, update_functor_receives_latest_value_as_parameter)
{
Foo f = {0, 1, 2, 3};
xenium::seqlock<Foo> data{f};
for (int32_t i = 0; i < 4; ++i) {
EXPECT_EQ(i, f.v1);
data.update([&f](Foo& cur) {
EXPECT_EQ(f, cur);
++cur;
});
++f;
}
}
TEST(SeqLock, update_functor_receives_latest_value_as_parameter_with_multple_slots)
{
Foo f = {0, 1, 2, 3};
xenium::seqlock<Foo, xenium::policy::slots<4>> data{f};
for (int32_t i = 0; i < 8; ++i) {
EXPECT_EQ(i, f.v1);
data.update([&f](Foo& cur) {
EXPECT_EQ(f, cur);
++cur;
});
++f;
}
}
TEST(SeqLock, read_returns_value_stored_by_update)
{
Foo f = {0, 1, 2, 3};
xenium::seqlock<Foo> data{f};
for (int32_t i = 0; i < 4; ++i) {
EXPECT_EQ(i, f.v1);
data.update([](Foo& cur) { ++cur; });
++f;
EXPECT_EQ(f, data.load());
}
}
TEST(SeqLock, read_returns_value_stored_by_update_with_multiple_slots)
{
Foo f = {0, 1, 2, 3};
xenium::seqlock<Foo, xenium::policy::slots<4>> data{f};
for (int32_t i = 0; i < 9; ++i) {
EXPECT_EQ(i, f.v1);
data.update([](Foo& cur) { ++cur; });
++f;
EXPECT_EQ(f, data.load());
}
}
TEST(SeqLock, parallel_usage)
{
xenium::seqlock<Foo, xenium::policy::slots<8>> data{{0, 0, 0, 0}};
std::vector<std::thread> threads;
for (int i = 0; i < 4; ++i)
{
threads.push_back(std::thread([&data]
{
#ifdef DEBUG
const int MaxIterations = 5000;
#else
const int MaxIterations = 50000;
#endif
for (int j = 0; j < MaxIterations; ++j) {
auto d = data.load();
EXPECT_TRUE(d.verify());
data.store(++d);
d = data.load();
EXPECT_TRUE(d.verify());
data.update([](Foo& f) {
EXPECT_TRUE(f.verify());
++f;
});
}
}));
}
for (auto& thread : threads)
thread.join();
}
}
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