QMGR_QUEUE *qmgr_queue_select(QMGR_TRANSPORT *transport)
{
QMGR_QUEUE *queue;
/*
* If we find a suitable site, rotate the list to enforce round-robin
* selection. See similar selection code in qmgr_transport_select().
*/
for (queue = transport->queue_list.next; queue; queue = queue->peers.next) {
if (queue->window > queue->busy_refcount && queue->todo.next != 0) {
QMGR_LIST_ROTATE(transport->queue_list, queue);
if (msg_verbose)
msg_info("qmgr_queue_select: %s", queue->name);
return (queue);
}
}
return (0);
}
QMGR_PEER *qmgr_peer_select(QMGR_JOB *job)
{
QMGR_PEER *peer;
QMGR_QUEUE *queue;
/*
* If we find a suitable site, rotate the list to enforce round-robin
* selection. See similar selection code in qmgr_transport_select().
*/
for (peer = job->peer_list.next; peer; peer = peer->peers.next) {
queue = peer->queue;
if (queue->window > queue->busy_refcount && peer->entry_list.next != 0) {
QMGR_LIST_ROTATE(job->peer_list, peer, peers);
if (msg_verbose)
msg_info("qmgr_peer_select: %s %s %s (%d of %d)",
job->message->queue_id, queue->transport->name, queue->name,
queue->busy_refcount + 1, queue->window);
return (peer);
}
}
return (0);
}
QMGR_TRANSPORT *qmgr_transport_select(void)
{
QMGR_TRANSPORT *xport;
QMGR_QUEUE *queue;
int need;
/*
* If we find a suitable transport, rotate the list of transports to
* effectuate round-robin selection. See similar selection code in
* qmgr_peer_select().
*
* This function is called repeatedly until all transports have maxed out
* the number of pending delivery agent connections, until all delivery
* agent concurrency windows are maxed out, or until we run out of "todo"
* queue entries.
*/
#define MIN5af51743e4eef(x, y) ((x) < (y) ? (x) : (y))
for (xport = qmgr_transport_list.next; xport; xport = xport->peers.next) {
if ((xport->flags & QMGR_TRANSPORT_STAT_DEAD) != 0
|| (xport->flags & QMGR_TRANSPORT_STAT_RATE_LOCK) != 0
|| xport->pending >= QMGR_TRANSPORT_MAX_PEND)
continue;
need = xport->pending + 1;
for (queue = xport->queue_list.next; queue; queue = queue->peers.next) {
if (QMGR_QUEUE_READY(queue) == 0)
continue;
if ((need -= MIN5af51743e4eef(queue->window - queue->busy_refcount,
queue->todo_refcount)) <= 0) {
QMGR_LIST_ROTATE(qmgr_transport_list, xport, peers);
if (msg_verbose)
msg_info("qmgr_transport_select: %s", xport->name);
return (xport);
}
}
}
return (0);
}
