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// Copyright (C) 2005 Open Source Telecom Corp.
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#include "engine.h"
using namespace ost;
using namespace std;
BayonneMsgport::BayonneMsgport(BayonneDriver *driver) :
Thread(atoi(driver->getLast("priority")), atoi(driver->getLast("stack")) * 1024),
Buffer(atoi(driver->getLast("events")))
{
unsigned size = atoi(driver->getLast("events"));
msgdriver = driver;
msglist = new Event[size];
msgsize = size;
msghead = msgtail = 0;
setString(msgname, sizeof(msgname), driver->getName());
}
BayonneMsgport::~BayonneMsgport()
{
shutdown();
}
void BayonneMsgport::shutdown(void)
{
Event down;
if(msglist)
{
SLOG_DEBUG("%s msgport stopping", msgname);
down.timeslot = NO_TIMESLOT;
down.id = MSGPORT_SHUTDOWN;
post(&down, 0);
terminate();
delete[] msglist;
msglist = NULL;
}
}
void BayonneMsgport::update(void)
{
Event event;
event.timeslot = NO_TIMESLOT;
event.id = MSGPORT_WAKEUP;
// if already pending, no need to update.
if(msghead != msgtail)
return;
if(!post(&event, 10))
slog.warn("%s: event buffer overflow", msgname);
}
void BayonneMsgport::initial(void)
{
timeslot_t timeslot, count;
BayonneSession *session;
if(!msgdriver)
return;
timeslot = tsfirst = msgdriver->getFirst();
count = tscount = msgdriver->getCount();
while(count--)
{
session = getSession(timeslot++);
if(!session)
continue;
session->initialevent();
}
msgdriver->oink.post(); // kick the pig
}
timeout_t BayonneMsgport::getTimeout(Event *event)
{
timeout_t timeout = TIMEOUT_INF, remaining;
timeslot_t timeslot, count, selected = NO_TIMESLOT;
BayonneSession *session;
if(!tscount)
{
event->id = MSGPORT_WAKEUP;
event->timeslot = NO_TIMESLOT;
return TIMEOUT_INF;
}
timeslot = tsfirst;
count = tscount;
while(count--)
{
session = getSession(timeslot);
if(!session)
{
++timeslot;
continue;
}
session->enter();
remaining = session->getRemaining();
session->leave();
if(remaining && remaining < timeout)
{
selected = timeslot;
timeout = remaining;
}
else if(!remaining)
{
event->id = TIMER_EXPIRED;
event->timeslot = timeslot;
session->putEvent(event);
}
++timeslot;
}
event->id = TIMER_EXPIRED;
event->timeslot = selected;
return timeout;
}
void BayonneMsgport::run(void)
{
BayonneSession *session;
Event event;
timeout_t timeout;
SLOG_DEBUG("%s msgport starting", msgname);
for(;;)
{
Thread::yield();
timeout = getTimeout(&event);
if(timeout)
{
if(timeout == TIMEOUT_INF)
wait(&event);
else
wait(&event, timeout);
}
switch(event.id)
{
case MSGPORT_SHUTDOWN:
Thread::sync();
default:
break;
}
session = getSession(event.timeslot);
if(session)
session->putEvent(&event);
}
}
size_t BayonneMsgport::onWait(void *buf)
{
Event *ep = (Event *)buf;
memcpy(ep, &msglist[msghead++], sizeof(Event));
if(msghead >= msgsize)
msghead = 0;
return sizeof(Event);
}
size_t BayonneMsgport::onPost(void *buf)
{
Event *ep = (Event *)buf;
memcpy(&msglist[msgtail++], ep, sizeof(Event));
if(msgtail >= msgsize)
msgtail = 0;
return sizeof(Event);
}
size_t BayonneMsgport::onPeek(void *buf)
{
Event *ep = (Event *)buf;
if(msghead == msgtail)
return 0;
memcpy(ep, &msglist[msghead], sizeof(Event));
return sizeof(Event);
}
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