zeroshade commented on code in PR #43632:
URL: https://github.com/apache/arrow/pull/43632#discussion_r1713974576
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cpp/src/arrow/c/abi.h:
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@@ -228,6 +228,65 @@ struct ArrowDeviceArrayStream {
#endif // ARROW_C_DEVICE_STREAM_INTERFACE
+#ifndef ARROW_C_ASYNC_STREAM_INTERFACE
+#define ARROW_C_ASYNC_STREAM_INTERFACE
+
+// Similar to ArrowDeviceArrayStream, except designed for an asynchronous
+// style of interaction. While ArrowDeviceArrayStream provides producer
+// defined callbacks, this is intended to be created by the consumer instead.
+// The consumer passes this handler to the producer, which in turn uses the
+// callbacks to inform the consumer of events in the stream.
+struct ArrowAsyncDeviceStreamHandler {
+ // Handler for receiving a schema. The passed in stream_schema should be
+ // released or moved by the handler (producer is giving ownership of it to
+ // the handler).
+ //
+ // The `extension_param` argument can be null or can be used by a producer
+ // to pass arbitrary extra information to the consumer (such as total number
+ // of rows, context info, or otherwise).
+ //
+ // Return value: 0 if successful, `errno`-compatible error otherwise
Review Comment:
> Either way though, if an error is returned or if the consumer explicitly
cancels in some way, I assume the producer needs to keep accepting calls to the
callbacks right? (e.g. returning an error here won't prevent on_next from being
called once or twice while the producer is cleaning up)
It won't prevent it, but the docs explicitly state that if an error is
returned from the callback, the producer should *only* call release after that
and not call further callbacks. though there isn't anything to functionally
prevent it.
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