Fix _util.device_from_ctx

cuda_core/cuda/core/experimental/_utils.py

@@ -116,8 +116,9 @@ def inner(*args, **kwargs):
 
 def get_device_from_ctx(ctx_handle) -> int:
     """Get device ID from the given ctx."""
-    prev_ctx = Device().context.handle
-    if ctx_handle != prev_ctx:
+    from cuda.core.experimental._device import Device # avoid circular import
+    prev_ctx = Device().context._handle
+    if int(ctx_handle) != int(prev_ctx):
         switch_context = True
     else:
         switch_context = False

cuda_core/tests/test_stream.py

@@ -71,6 +71,16 @@ def test_stream_context():
     context = stream.context
     assert context is not None
 
+def test_stream_from_foreign_stream():
+    device = Device()
+    other_stream = device.create_stream(options=StreamOptions())
+    stream = device.create_stream(obj=other_stream)
+    assert other_stream.handle == stream.handle
+    device = stream.device
+    assert isinstance(device, Device)
+    context = stream.context
+    assert context is not None
+
 def test_stream_from_handle():
     stream = Stream.from_handle(0)
     assert isinstance(stream, Stream)