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Copy pathTestPyBuffer.cs
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197 lines (164 loc) · 6.12 KB
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using System;
using System.Runtime.CompilerServices;
using System.Text;
using System.Threading;
using NUnit.Framework;
using Python.Runtime;
using Python.Runtime.Codecs;
namespace Python.EmbeddingTest {
class TestPyBuffer
{
[OneTimeSetUp]
public void SetUp()
{
TupleCodec<ValueTuple>.Register();
}
[OneTimeTearDown]
public void Dispose()
{
PyObjectConversions.Reset();
}
[Test]
public void TestBufferWrite()
{
string bufferTestString = "hello world! !$%&/()=?";
string bufferTestString2 = "h llo world! !$%&/()=?";
using var _ = Py.GIL();
using var pythonArray = ByteArrayFromAsciiString(bufferTestString);
using (PyBuffer buf = pythonArray.GetBuffer(PyBUF.WRITABLE))
{
byte[] managedArray = { (byte)' ' };
buf.Write(managedArray, 0, managedArray.Length, 1);
}
string result = pythonArray.InvokeMethod("decode", "utf-8".ToPython()).As<string>();
Assert.That(result == bufferTestString2, Is.True);
}
[Test]
public void TestBufferRead()
{
string bufferTestString = "hello world! !$%&/()=?";
using var _ = Py.GIL();
using var pythonArray = ByteArrayFromAsciiString(bufferTestString);
byte[] managedArray = new byte[bufferTestString.Length];
using (PyBuffer buf = pythonArray.GetBuffer())
{
managedArray[0] = (byte)' ';
buf.Read(managedArray, 1, managedArray.Length - 1, 1);
}
string result = new UTF8Encoding().GetString(managedArray);
Assert.That(result == " " + bufferTestString.Substring(1), Is.True);
}
[Test]
public void ArrayHasBuffer()
{
var array = new[,] {{1, 2}, {3,4}};
var memoryView = PythonEngine.Eval("memoryview");
var mem = memoryView.Invoke(array.ToPython());
Assert.That(mem[(0, 0).ToPython()].As<int>(), Is.EqualTo(1));
Assert.That(mem[(1, 0).ToPython()].As<int>(), Is.EqualTo(array[1, 0]));
}
[Test]
public void RefCount()
{
using var _ = Py.GIL();
using var arr = ByteArrayFromAsciiString("hello world! !$%&/()=?");
Assert.That(arr.Refcount, Is.EqualTo(1));
using (PyBuffer buf = arr.GetBuffer())
{
Assert.That(arr.Refcount, Is.EqualTo(2));
}
Assert.That(arr.Refcount, Is.EqualTo(1));
}
[Test]
public void Finalization()
{
if (Type.GetType("Mono.Runtime") is not null)
{
Assert.Inconclusive("test unreliable in Mono");
return;
}
using var _ = Py.GIL();
using var arr = ByteArrayFromAsciiString("hello world! !$%&/()=?");
Assert.That(arr.Refcount, Is.EqualTo(1));
MakeBufAndLeak(arr);
GC.Collect();
GC.WaitForPendingFinalizers();
Finalizer.Instance.Collect();
Assert.That(arr.Refcount, Is.EqualTo(1));
}
[Test]
public void MultidimensionalNumPyArray()
{
var ndarray = np.arange(24).reshape(1,2,3,4).T;
PyObject ndim = ndarray.ndim;
PyObject shape = ndarray.shape;
PyObject strides = ndarray.strides;
PyObject contiguous = ndarray.flags["C_CONTIGUOUS"];
using PyBuffer buf = ndarray.GetBuffer(PyBUF.STRIDED);
Assert.Multiple(() =>
{
Assert.That(buf.Dimensions, Is.EqualTo(ndim.As<int>()));
Assert.That(buf.Shape, Is.EqualTo(shape.As<long[]>()));
Assert.That(buf.Strides, Is.EqualTo(strides.As<long[]>()));
Assert.That(buf.IsContiguous(BufferOrderStyle.C), Is.EqualTo(contiguous.As<bool>()));
});
}
[Test]
public void ConcurrentDispose()
{
// Two threads racing on Dispose() must not double-release the view —
// Interlocked.Exchange on disposedValue gates PyBuffer_Release.
// Smoke test: no crash, exception, or buffer-protocol violation.
using var _ = Py.GIL();
using var arr = ByteArrayFromAsciiString("hello world! !$%&/()=?");
const int iterations = 200;
for (int i = 0; i < iterations; i++)
{
PyBuffer buf = arr.GetBuffer();
IntPtr ts = PythonEngine.BeginAllowThreads();
using var barrier = new Barrier(2);
Exception captured = null;
Action race = () =>
{
try
{
barrier.SignalAndWait();
using (Py.GIL()) buf.Dispose();
}
catch (Exception ex) { Interlocked.CompareExchange(ref captured, ex, null); }
};
var t1 = new Thread(() => race());
var t2 = new Thread(() => race());
t1.Start(); t2.Start();
t1.Join(); t2.Join();
PythonEngine.EndAllowThreads(ts);
if (captured != null) throw captured;
}
}
[MethodImpl(MethodImplOptions.NoInlining)]
static void MakeBufAndLeak(PyObject bufProvider)
{
PyBuffer buf = bufProvider.GetBuffer();
}
static PyObject ByteArrayFromAsciiString(string str)
{
using var scope = Py.CreateScope();
return Runtime.Runtime.PyByteArray_FromStringAndSize(str).MoveToPyObject();
}
dynamic np
{
get
{
try
{
return Py.Import("numpy");
}
catch (PythonException)
{
Assert.Inconclusive("Numpy or dependency not installed");
return null;
}
}
}
}
}