From c9c0edf5a8fc9f79fff42064db09bc297e117a88 Mon Sep 17 00:00:00 2001 From: eunhhu Date: Wed, 30 Sep 2026 03:03:52 +0100 Subject: Let a receiver whose app is full keep what came, and say so 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). --- link/link-protocol.h | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) (limited to 'link/link-protocol.h') diff --git a/link/link-protocol.h b/link/link-protocol.h index f131e99..96085c6 100644 --- a/link/link-protocol.h +++ b/link/link-protocol.h @@ -225,8 +225,11 @@ typedef struct { void *context; } PureLinkHost; /* A delivery's end: heard, the last number heard; stored, its save - * succeeded (else it is handed over again); gap, it stopped at a gap. */ -typedef struct { void *token; uint64_t heard; bool stored, gap; } PureLinkDone; + * succeeded (else it is handed over again); gap, it stopped at a gap; full, + * the host has no room for more now (its app's memory budget): what it did + * not take is kept, and handed over again after a pause, 100 ms doubling to + * half a second while it stays full (its sender told so meanwhile). */ +typedef struct { void *token; uint64_t heard; bool stored, gap, full; } PureLinkDone; /* A packet to send to an address a packet came from: whether it went. */ typedef bool PureLinkSend(void *context, const unsigned char *packet, size_t size, const unsigned char *to, size_t to_size); -- cgit v1.2.3