pitrou commented on code in PR #43632:
URL: https://github.com/apache/arrow/pull/43632#discussion_r1718557385
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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.
Review Comment:
What this doesn't state is whether the producer must serialize calls to
these callbacks, or if, for example, it is allowed to invoke `on_next` from
several threads at once.
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