static
void req_bcsple_msg(abcsp *_this, lemsgid id)
{
/* <Sigh.> The bitfield abcsp_txrx means we can't table-drive. */
switch (id)
{
case lemsgid_sync:
_this->txrx.txsync_req = 1;
break;
case lemsgid_sync_resp:
_this->txrx.txsyncresp_req = 1;
break;
case lemsgid_conf:
_this->txrx.txconf_req = 1;
break;
case lemsgid_conf_resp:
_this->txrx.txconfresp_req = 1;
break;
default:
return;
}
/* Kick the transmit path into wakefulness. */
ABCSP_REQ_PUMPTXMSGS(_this);
}
unsigned abcsp_sendmsg(ABCSP_TXMSG *msg, unsigned chan, unsigned rel)
{
TXMSG *m;
/* Reject all traffic if the choke is applied.
BCSP-LE messages are transmitted from code below this entry point.
The choke should be applied at the "mux" layer. Applying it here
means that if the choke is turned on while messages are queued for
transmission then those messages will drain out. This is strictly
incorrect, but this won't harm any real system as the choke is only
set TRUE by abcsp library init, so any peer is going to see
disrupted traffic for a while anyway. (Ideally, bcsp-le messages
from here will tell the peer that we've restarted, so it should
reinit and rechoke.) */
if(abcsp_txrx.choke) {
ABCSP_EVENT(ABCSP_EVT_TX_CHOKE_DISCARD);
return(0);
}
/* Parameter sanity checks. */
if(rel > 1 || chan < 2 || chan > 15 || msg == (ABCSP_TXMSG*)(NULL))
return(0);
/* We queue enough reliable messages to fill the WINSIZE window. */
if(rel && msgq_len(relq) >= ABCSP_TXWINSIZE) {
ABCSP_EVENT(ABCSP_EVT_TX_WINDOW_FULL_DISCARD);
return(0);
}
/* Package the message. */
if((m = ZNEW(TXMSG)) == (TXMSG*)(NULL))
return(0);
m->m = msg;
m->chan = chan;
if(rel) {
/* We've already checked the reliable queue has room. */
m->seq = msgq_txseq;
msgq_txseq = incrmod8(msgq_txseq);
msgq_add(&relq, m);
}
else {
/* The unreliable channel is biased towards supporting
sco, for which the data has to be fresh. The queue
holds only one message, so we displace any message that's
already in the queue. */
(void) msgq_pop_destroy(&unrelq);
msgq_add(&unrelq, m);
}
/* Tell external code that it needs to call abcsp_pumptxmsgs(). */
ABCSP_REQ_PUMPTXMSGS();
/* Report message accepted. */
return(1);
}