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removing ACKd messages with noidx optimisation can fail if samples have been written after matching multiple readers but before the first ACK arrives

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Signed-off-by: Erik Boasson <eb@ilities.com>
This commit is contained in:
Erik Boasson 2018-05-21 17:25:46 +08:00
parent 6d48d692ba
commit 33c89f0d47
1 changed files with 15 additions and 2 deletions
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17
src/core/ddsi/src/q_whc.c
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@ -677,8 +677,21 @@ static unsigned whc_remove_acked_messages_noidx (struct whc *whc, seqno_t max_dr
the highest available sequence number (which then must be less) */
if ((whcn = whc_findseq (whc, max_drop_seq)) == NULL)
{
whcn = whc->maxseq_node;
assert (whcn->seq < max_drop_seq);
if (max_drop_seq < intv->min)
{
/* at startup, whc->max_drop_seq = 0 and reader states have max ack'd seq taken from wr->seq;
so if multiple readers are matched and the writer runs ahead of the readers, for the first
ack, whc->max_drop_seq < max_drop_seq = MIN(readers max ack) < intv->min */
if (max_drop_seq > whc->max_drop_seq)
whc->max_drop_seq = max_drop_seq;
*deferred_free_list = NULL;
return 0;
}
else
{
whcn = whc->maxseq_node;
assert (whcn->seq < max_drop_seq);
}
}
*deferred_free_list = intv->first;