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When the mux failed to transfer data to the upper layer because of a lack of room, it is important to wake the stream up to let it handle this event. Otherwise, if the stream is waiting for more data, both the stream and the mux reamin blocked waiting for each other. When this happens, the mux set the CS_FL_WANT_ROOM flag on the conn-stream. Thus, in si_cs_recv() we are able to detect this event. Today, the stream-interface is blocked. But, it is not enough to wake the stream up. To fix the bug, CF_READ_PARTIAL flag is extended to also handle cases where a read exception occurred. This flag should idealy be renamed. But for now, it is good enough. By setting this flag, we are sure the stream will be woken up. This patch is part of a series related to the issue #1362. It should be backported as far as 2.0, probably with some adaptations. So be careful during backports.