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#include <xenium/reclamation/generic_epoch_based.hpp>
#include <gtest/gtest.h>
namespace {
using Reclaimer = xenium::reclamation::generic_epoch_based<>::with<xenium::policy::scan_frequency<0>>;
struct Foo : Reclaimer::enable_concurrent_ptr<Foo, 2>
{
Foo** instance;
Foo(Foo** instance) : instance(instance) {}
virtual ~Foo() { if (instance) *instance = nullptr; }
};
template <typename T>
using concurrent_ptr = Reclaimer::concurrent_ptr<T>;
template <typename T> using marked_ptr = typename concurrent_ptr<T>::marked_ptr;
struct GenericEpochBased : testing::Test
{
Foo* foo = new Foo(&foo);
marked_ptr<Foo> mp = marked_ptr<Foo>(foo, 3);
void update_epoch()
{
// UpdateThreshold is set to 0, so we simply need create a guard_ptr to some dummy object
// to trigger and epoch update.
Foo dummy(nullptr);
concurrent_ptr<Foo>::guard_ptr gp(&dummy);
}
void wrap_around_epochs()
{
update_epoch();
update_epoch();
update_epoch();
}
void TearDown() override
{
wrap_around_epochs();
if (mp == nullptr)
assert(foo == nullptr);
else
delete foo;
}
};
TEST_F(GenericEpochBased, mark_returns_the_same_mark_as_the_original_marked_ptr)
{
concurrent_ptr<Foo>::guard_ptr gp(mp);
EXPECT_EQ(mp.mark(), gp.mark());
}
TEST_F(GenericEpochBased, get_returns_the_same_pointer_as_the_original_marked_ptr)
{
concurrent_ptr<Foo>::guard_ptr gp(mp);
EXPECT_EQ(mp.get(), gp.get());
}
TEST_F(GenericEpochBased, reset_releases_ownership_and_sets_pointer_to_null)
{
concurrent_ptr<Foo>::guard_ptr gp(mp);
gp.reset();
EXPECT_EQ(nullptr, gp.get());
}
TEST_F(GenericEpochBased, reclaim_releases_ownership_and_the_object_gets_deleted_when_advancing_two_epochs)
{
concurrent_ptr<Foo>::guard_ptr gp(mp);
gp.reclaim();
this->mp = nullptr;
EXPECT_EQ(nullptr, gp.get());
EXPECT_NE(nullptr, foo);
wrap_around_epochs();
EXPECT_EQ(nullptr, foo);
}
struct WithCustomDeleter;
struct DummyDeleter {
bool* called;
WithCustomDeleter* reference;
void operator()(WithCustomDeleter* obj) const;
};
struct WithCustomDeleter : Reclaimer::enable_concurrent_ptr<WithCustomDeleter, 2, DummyDeleter> {};
void DummyDeleter::operator()(WithCustomDeleter* obj) const {
*called = true;
EXPECT_EQ(reference, obj);
delete obj;
}
TEST_F(GenericEpochBased, supports_custom_deleters)
{
bool called = false;
concurrent_ptr<WithCustomDeleter>::guard_ptr gp(new WithCustomDeleter());
gp.reclaim(DummyDeleter{&called, gp.get()});
wrap_around_epochs();
EXPECT_TRUE(called);
}
TEST_F(GenericEpochBased, object_cannot_be_reclaimed_as_long_as_another_guard_protects_it)
{
concurrent_ptr<Foo>::guard_ptr gp(mp);
concurrent_ptr<Foo>::guard_ptr gp2(mp);
gp.reclaim();
wrap_around_epochs();
EXPECT_NE(nullptr, foo);
}
TEST_F(GenericEpochBased, copy_constructor_leads_to_shared_ownership_preventing_the_object_from_beeing_reclaimed)
{
concurrent_ptr<Foo>::guard_ptr gp(mp);
concurrent_ptr<Foo>::guard_ptr gp2(gp);
gp.reclaim();
this->mp = nullptr;
wrap_around_epochs();
EXPECT_NE(nullptr, foo);
}
TEST_F(GenericEpochBased, move_constructor_moves_ownership_and_resets_source_object)
{
concurrent_ptr<Foo>::guard_ptr gp(mp);
concurrent_ptr<Foo>::guard_ptr gp2(std::move(gp));
EXPECT_EQ(nullptr, gp.get());
gp2.reclaim();
this->mp = nullptr;
wrap_around_epochs();
EXPECT_EQ(nullptr, foo);
}
TEST_F(GenericEpochBased, copy_assignment_leads_to_shared_ownership_preventing_the_object_from_beeing_reclaimed)
{
concurrent_ptr<Foo>::guard_ptr gp(mp);
concurrent_ptr<Foo>::guard_ptr gp2{};
gp2 = gp;
gp.reclaim();
this->mp = nullptr;
wrap_around_epochs();
EXPECT_NE(nullptr, foo);
}
TEST_F(GenericEpochBased, move_assignment_moves_ownership_and_resets_source_object)
{
concurrent_ptr<Foo>::guard_ptr gp(mp);
concurrent_ptr<Foo>::guard_ptr gp2{};
gp2 = std::move(gp);
EXPECT_EQ(nullptr, gp.get());
gp2.reclaim();
this->mp = nullptr;
wrap_around_epochs();
EXPECT_EQ(nullptr, gp.get());
EXPECT_EQ(nullptr, foo);
}
}
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