commit de6dc699c91e18bd3705fd253141e9ca1fb8ebcf
Author: Oswald Buddenhagen <o...@users.sf.net>
Date: Thu Jul 16 14:47:30 2020 +0200
make expiration loops solely far-side-driven
we can do that, as unpaired near-side messages are ignored anyway.
this mildly changes expiration order, as near-side messages that
existed for a long time but were propagated much later will be expired
later. however, that has no practical relevance.
src/sync.c | 96 ++++++++++++++++++++++++------------------------------
1 file changed, 42 insertions(+), 54 deletions(-)
diff --git a/src/sync.c b/src/sync.c
index c67ba12..18a381b 100644
--- a/src/sync.c
+++ b/src/sync.c
@@ -1653,74 +1653,62 @@ box_loaded( int sts, message_t *msgs, int total_msgs,
int recent_msgs, void *aux
/* Expire excess messages. Important (flagged, unread, or
unpropagated) messages
* older than the first not expired message are not counted
towards the total. */
debug( "preparing message expiration\n" );
+ // Due to looping only over the far side, we completely ignore
unpaired
+ // near-side messages. This is correct, as we cannot expire
them without
+ // data loss anyway; consequently, we also don't count them.
+ // Note that we also ignore near-side messages we're currently
propagating,
+ // which delays expiration of some messages by one cycle.
Otherwise, we'd have
+ // to sequence flag propagation after message propagation to
avoid a race
+ // with 3rd-party expunging, and that seems unreasonably
expensive.
alive = 0;
- for (tmsg = svars->msgs[N]; tmsg; tmsg = tmsg->next) {
+ for (tmsg = svars->msgs[F]; tmsg; tmsg = tmsg->next) {
if (tmsg->status & M_DEAD)
continue;
- if (!(srec = tmsg->srec) || !srec->uid[F]) {
- // The message was not propagated, so it
doesn't count towards the total.
- // Note that we also ignore messages we're
currently propagating, which
- // delays expiry of some messages by one cycle.
Otherwise, we'd have to
- // sequence flag propagation after message
propagation to avoid a race
- // with 3rd-party expunging, and that seems
unreasonable.
- } else if (((tmsg->flags | srec->aflags[N]) &
~srec->dflags[N] & F_DELETED) &&
- !(srec->status & (S_EXPIRE|S_EXPIRED))) {
- // The paired message is being deleted.
+ // We ignore unpaired far-side messages, as there is
obviously nothing
+ // to expire in the first place.
+ if (!(srec = tmsg->srec))
+ continue;
+ if (!(srec->status & S_PENDING)) {
+ if (!srec->msg[N])
+ continue; // Already expired or
skipped.
+ nflags = (srec->msg[N]->flags |
srec->aflags[N]) & ~srec->dflags[N];
} else {
- alive++;
+ nflags = tmsg->flags;
}
- }
- for (tmsg = svars->msgs[F]; tmsg; tmsg = tmsg->next) {
- if (tmsg->status & M_DEAD)
- continue;
- if ((srec = tmsg->srec) && (srec->status & S_PENDING)
&& !(tmsg->flags & F_DELETED))
+ if (!(nflags & F_DELETED) || (srec->status &
(S_EXPIRE|S_EXPIRED)))
+ // The message is not deleted, or it is, but
only due to being expired.
alive++;
}
todel = alive - svars->chan->max_messages;
debug( "%d alive messages, %d excess - expiring\n", alive,
todel );
alive = 0;
- for (tmsg = svars->msgs[N]; tmsg; tmsg = tmsg->next) {
- if (tmsg->status & M_DEAD)
- continue;
- if (!(srec = tmsg->srec) || !srec->uid[F]) {
- /* We did not push the message, so it must be
kept. */
- debug( " message %u unpropagated\n", tmsg->uid
);
- } else {
- nflags = (tmsg->flags | srec->aflags[N]) &
~srec->dflags[N];
- if (!(nflags & F_DELETED) || (srec->status &
(S_EXPIRE|S_EXPIRED))) {
- /* The message is not deleted, or is
already (being) expired. */
- if ((nflags & F_FLAGGED) || !((nflags &
F_SEEN) || ((void)(todel > 0 && alive++), svars->chan->expire_unread > 0))) {
- /* Important messages are
always kept. */
- debug( " old pair(%u,%u)
important\n", srec->uid[F], srec->uid[N] );
- todel--;
- } else if (todel > 0 ||
- ((srec->status &
(S_EXPIRE|S_EXPIRED)) == (S_EXPIRE|S_EXPIRED)) ||
- ((srec->status &
(S_EXPIRE|S_EXPIRED)) && (tmsg->flags & F_DELETED))) {
- /* The message is excess or was
already (being) expired. */
- srec->wstate |= W_NEXPIRE;
- debug( " old pair(%u,%u)
expired\n", srec->uid[F], srec->uid[N] );
- if (svars->maxxfuid <
srec->uid[F])
- svars->maxxfuid =
srec->uid[F];
- todel--;
- }
- }
- }
- }
for (tmsg = svars->msgs[F]; tmsg; tmsg = tmsg->next) {
if (tmsg->status & M_DEAD)
continue;
- if ((srec = tmsg->srec) && (srec->status & S_PENDING)) {
+ if (!(srec = tmsg->srec))
+ continue;
+ if (!(srec->status & S_PENDING)) {
+ if (!srec->msg[N])
+ continue;
+ nflags = (srec->msg[N]->flags |
srec->aflags[N]) & ~srec->dflags[N];
+ } else {
nflags = tmsg->flags;
- if (!(nflags & F_DELETED)) {
- if ((nflags & F_FLAGGED) || !((nflags &
F_SEEN) || ((void)(todel > 0 && alive++), svars->chan->expire_unread > 0))) {
- /* Important messages are
always fetched. */
- debug( " new pair(%u,%u)
important\n", srec->uid[F], srec->uid[N] );
- todel--;
- } else if (todel > 0) {
- /* The message is excess. */
- srec->wstate |= W_NEXPIRE;
- todel--;
- }
+ }
+ if (!(nflags & F_DELETED) || (srec->status &
(S_EXPIRE|S_EXPIRED))) {
+ if ((nflags & F_FLAGGED) ||
+ !((nflags & F_SEEN) || ((void)(todel > 0 &&
alive++), svars->chan->expire_unread > 0))) {
+ // Important messages are always
fetched/kept.
+ debug( " pair(%u,%u) is important\n",
srec->uid[F], srec->uid[N] );
+ todel--;
+ } else if (todel > 0 ||
+ ((srec->status &
(S_EXPIRE|S_EXPIRED)) == (S_EXPIRE|S_EXPIRED)) ||
+ ((srec->status &
(S_EXPIRE|S_EXPIRED)) && (srec->msg[N]->flags & F_DELETED))) {
+ /* The message is excess or was already
(being) expired. */
+ srec->wstate |= W_NEXPIRE;
+ debug( " pair(%u,%u) expired\n",
srec->uid[F], srec->uid[N] );
+ if (svars->maxxfuid < srec->uid[F])
+ svars->maxxfuid = srec->uid[F];
+ todel--;
}
}
}
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