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A link's delivery the app had no room for was handed over again at the
next turn: a receiver over its memory budget would refuse the same
records as fast as the owner could apply them. And its sender, seeing
records received but not stored for a second, sent the whole window
again every second.
Now a host says a delivery found it full (PureLinkDone.full). The
receiver keeps the records and hands them over again after a pause, 100
ms doubling to 500 ms, and meanwhile its STORED frames carry flag 2: the
app is full and what came is kept. A sender hearing it starts its
one-second wait for the save again, and sends none of it again. The
spec (012) says both sides; the pause is a local choice that must stay
under the sender's wait.
pure_link_done takes the PureLinkDone itself. test-link's new case keeps
the app full for 5 s: 12 hand-overs meanwhile, taken within 0.5 s of
having room, and no record sent again (21,640 without the flag).
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020-lossy-paths/run.py runs each case in an unprivileged namespace: a
50 Mbit/s tbf bottleneck under netem's delay, jitter and loss, both
ways. A link may send without UDP GSO (pure_link_gso), as netem takes a
burst as one packet; quinn the same (QUIC_GSO=0). transport.c and the
quinn harness give the records handed over in each 100 ms, and at a
steady rate the time each took; TCP CUBIC flows run beside them.
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link/link-protocol.h is the protocol with no socket, thread or clock of
its own: packets and time in, packets out. link/link.h carries it over
UDP as before. A sender starts small (8 flights, 16 records, a 4 KiB
ring) so one thread can hold many. The transport's CPU a record is the
same within 2% (five rounds each way, 61 B to 16 KiB).
test-link runs both sides through a network of its own: loss, packets
held back and doubled, failed saves, an idle sweep, and both sides
starting again, every record applied once as sent.
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A sender takes its messages' shape, and a listener asks its host which
input a stream goes to. The core gives the shape (pure_module_shape);
link/ now builds without the core's headers.
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libpure-link.a holds them; pure-serve and the M5 harness link it instead
of naming its source files.
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