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#include <library/cpp/testing/gtest/gtest.h>
#include <library/cpp/yt/memory/new.h>
#include <library/cpp/yt/memory/ref_counted.h>
#include <library/cpp/yt/memory/atomic_intrusive_ptr.h>
namespace NYT {
namespace {
////////////////////////////////////////////////////////////////////////////////
using ::testing::IsNull;
using ::testing::NotNull;
using ::testing::InSequence;
using ::testing::MockFunction;
using ::testing::StrictMock;
////////////////////////////////////////////////////////////////////////////////
// Auxiliary types and functions.
////////////////////////////////////////////////////////////////////////////////
// This object tracks number of increments and decrements
// to the reference counter (see traits specialization below).
struct TIntricateObject
: private TNonCopyable
{
mutable int Increments = 0;
mutable int Decrements = 0;
mutable int Zeros = 0;
void Ref(int n) const
{
Increments += n;
}
void Unref(int n) const
{
Decrements += n;
if (Increments == Decrements) {
++Zeros;
}
}
};
using TIntricateObjectPtr = TIntrusivePtr<TIntricateObject>;
using TConstIntricateObjectPtr = TIntrusivePtr<const TIntricateObject>;
void Ref(TIntricateObject* obj, int n = 1)
{
obj->Ref(n);
}
void Unref(TIntricateObject* obj, int n = 1)
{
obj->Unref(n);
}
void Ref(const TIntricateObject* obj, int n = 1)
{
obj->Ref(n);
}
void Unref(const TIntricateObject* obj, int n = 1)
{
obj->Unref(n);
}
MATCHER_P3(HasRefCounts, increments, decrements, zeros,
"Reference counter " \
"was incremented " + ::testing::PrintToString(increments) + " times, " +
"was decremented " + ::testing::PrintToString(decrements) + " times, " +
"vanished to zero " + ::testing::PrintToString(zeros) + " times")
{
Y_UNUSED(result_listener);
return
arg.Increments == increments &&
arg.Decrements == decrements &&
arg.Zeros == zeros;
}
void PrintTo(const TIntricateObject& arg, ::std::ostream* os)
{
*os << arg.Increments << " increments, "
<< arg.Decrements << " decrements and "
<< arg.Zeros << " times vanished";
}
// This is an object which creates intrusive pointers to the self
// during its construction.
class TObjectWithSelfPointers
: public TRefCounted
{
public:
explicit TObjectWithSelfPointers(IOutputStream* output)
: Output_(output)
{
*Output_ << "Cb";
for (int i = 0; i < 3; ++i) {
*Output_ << '!';
TIntrusivePtr<TObjectWithSelfPointers> ptr(this);
}
*Output_ << "Ca";
}
virtual ~TObjectWithSelfPointers()
{
*Output_ << 'D';
}
private:
IOutputStream* const Output_;
};
// This is a simple object with simple reference counting.
class TObjectWithSimpleRC
: public TRefCounted
{
public:
explicit TObjectWithSimpleRC(IOutputStream* output)
: Output_(output)
{
*Output_ << 'C';
}
virtual ~TObjectWithSimpleRC()
{
*Output_ << 'D';
}
void DoSomething()
{
*Output_ << '!';
}
private:
IOutputStream* const Output_;
};
// This is a simple object with full-fledged reference counting.
class TObjectWithFullRC
: public TRefCounted
{
public:
explicit TObjectWithFullRC(IOutputStream* output)
: Output_(output)
{
*Output_ << 'C';
}
virtual ~TObjectWithFullRC()
{
*Output_ << 'D';
}
void DoSomething()
{
*Output_ << '!';
}
private:
IOutputStream* const Output_;
};
////////////////////////////////////////////////////////////////////////////////
TEST(TAtomicPtrTest, Empty)
{
TIntricateObjectPtr emptyPointer;
EXPECT_EQ(nullptr, emptyPointer.Get());
}
// Reserved ref count.
constexpr int RRC = 65535;
TEST(TAtomicPtrTest, Basic)
{
TIntricateObject object;
EXPECT_THAT(object, HasRefCounts(0, 0, 0));
{
TIntricateObjectPtr owningPointer(&object);
EXPECT_THAT(object, HasRefCounts(1, 0, 0));
EXPECT_EQ(&object, owningPointer.Get());
}
EXPECT_THAT(object, HasRefCounts(1, 1, 1));
{
TIntricateObjectPtr owningPointer(&object);
TAtomicIntrusivePtr<TIntricateObject> atomicPointer(owningPointer);
EXPECT_THAT(object, HasRefCounts(2 + RRC, 1, 1));
EXPECT_EQ(&object, owningPointer.Get());
auto p1 = atomicPointer.Acquire();
EXPECT_THAT(object, HasRefCounts(2 + RRC, 1, 1));
p1.Reset();
EXPECT_THAT(object, HasRefCounts(2 + RRC, 2, 1));
owningPointer.Reset();
EXPECT_THAT(object, HasRefCounts(2 + RRC, 3, 1));
}
EXPECT_THAT(object, HasRefCounts(2 + RRC, 2 + RRC, 2));
}
TEST(TAtomicPtrTest, BasicConst)
{
const TIntricateObject object;
EXPECT_THAT(object, HasRefCounts(0, 0, 0));
{
TConstIntricateObjectPtr owningPointer(&object);
EXPECT_THAT(object, HasRefCounts(1, 0, 0));
EXPECT_EQ(&object, owningPointer.Get());
}
EXPECT_THAT(object, HasRefCounts(1, 1, 1));
{
TConstIntricateObjectPtr owningPointer(&object);
TAtomicIntrusivePtr<const TIntricateObject> atomicPointer(owningPointer);
EXPECT_THAT(object, HasRefCounts(2 + RRC, 1, 1));
EXPECT_EQ(&object, owningPointer.Get());
auto p1 = atomicPointer.Acquire();
EXPECT_THAT(object, HasRefCounts(2 + RRC, 1, 1));
p1.Reset();
EXPECT_THAT(object, HasRefCounts(2 + RRC, 2, 1));
owningPointer.Reset();
EXPECT_THAT(object, HasRefCounts(2 + RRC, 3, 1));
}
EXPECT_THAT(object, HasRefCounts(2 + RRC, 2 + RRC, 2));
}
TEST(TAtomicPtrTest, Acquire)
{
TIntricateObject object;
{
TAtomicIntrusivePtr<TIntricateObject> atomicPtr{TIntricateObjectPtr(&object)};
EXPECT_THAT(object, HasRefCounts(RRC, 0, 0));
for (int i = 0; i < RRC / 2; ++i) {
{
auto tmp = atomicPtr.Acquire();
EXPECT_THAT(object, HasRefCounts(RRC, i, 0));
}
EXPECT_THAT(object, HasRefCounts(RRC, i + 1, 0));
}
{
auto tmp = atomicPtr.Acquire();
EXPECT_THAT(object, HasRefCounts( RRC + RRC / 2, RRC - 1, 0));
}
EXPECT_THAT(object, HasRefCounts(RRC + RRC / 2, RRC, 0));
}
EXPECT_THAT(object, HasRefCounts(RRC + RRC / 2, RRC + RRC / 2, 1));
}
TEST(TAtomicPtrTest, AcquireConst)
{
const TIntricateObject object;
{
TAtomicIntrusivePtr<const TIntricateObject> atomicPtr{TConstIntricateObjectPtr(&object)};
EXPECT_THAT(object, HasRefCounts(RRC, 0, 0));
for (int i = 0; i < RRC / 2; ++i) {
{
auto tmp = atomicPtr.Acquire();
EXPECT_THAT(object, HasRefCounts(RRC, i, 0));
}
EXPECT_THAT(object, HasRefCounts(RRC, i + 1, 0));
}
{
auto tmp = atomicPtr.Acquire();
EXPECT_THAT(object, HasRefCounts( RRC + RRC / 2, RRC - 1, 0));
}
EXPECT_THAT(object, HasRefCounts(RRC + RRC / 2, RRC, 0));
}
EXPECT_THAT(object, HasRefCounts(RRC + RRC / 2, RRC + RRC / 2, 1));
}
TEST(TAtomicPtrTest, CAS)
{
TIntricateObject o1;
TIntricateObject o2;
{
TAtomicIntrusivePtr<TIntricateObject> atomicPtr{TIntricateObjectPtr(&o1)};
EXPECT_THAT(o1, HasRefCounts(RRC, 0, 0));
TIntricateObjectPtr p2(&o2);
EXPECT_THAT(o2, HasRefCounts(1, 0, 0));
void* rawPtr = &o1;
EXPECT_TRUE(atomicPtr.CompareAndSwap(rawPtr, std::move(p2)));
EXPECT_EQ(rawPtr, &o1);
EXPECT_THAT(o1, HasRefCounts(RRC, RRC, 1));
EXPECT_THAT(o2, HasRefCounts(RRC, 0, 0));
rawPtr = nullptr;
EXPECT_FALSE(atomicPtr.CompareAndSwap(rawPtr, TIntricateObjectPtr(&o1)));
EXPECT_EQ(rawPtr, &o2);
EXPECT_THAT(o1, HasRefCounts(2 * RRC, 2 * RRC, 2));
EXPECT_THAT(o2, HasRefCounts(RRC, 0, 0));
}
EXPECT_THAT(o2, HasRefCounts(RRC, RRC, 1));
}
TEST(TAtomicPtrTest, CASConst)
{
const TIntricateObject o1;
const TIntricateObject o2;
{
TAtomicIntrusivePtr<const TIntricateObject> atomicPtr{TConstIntricateObjectPtr(&o1)};
EXPECT_THAT(o1, HasRefCounts(RRC, 0, 0));
TConstIntricateObjectPtr p2(&o2);
EXPECT_THAT(o2, HasRefCounts(1, 0, 0));
const void* rawPtr = &o1;
EXPECT_TRUE(atomicPtr.CompareAndSwap(rawPtr, std::move(p2)));
EXPECT_EQ(rawPtr, &o1);
EXPECT_THAT(o1, HasRefCounts(RRC, RRC, 1));
EXPECT_THAT(o2, HasRefCounts(RRC, 0, 0));
rawPtr = nullptr;
EXPECT_FALSE(atomicPtr.CompareAndSwap(rawPtr, TConstIntricateObjectPtr(&o1)));
EXPECT_EQ(rawPtr, &o2);
EXPECT_THAT(o1, HasRefCounts(2 * RRC, 2 * RRC, 2));
EXPECT_THAT(o2, HasRefCounts(RRC, 0, 0));
}
EXPECT_THAT(o2, HasRefCounts(RRC, RRC, 1));
}
////////////////////////////////////////////////////////////////////////////////
} // namespace
} // namespace NYT
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