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/*
* This file is part of PowerDNS or dnsdist.
* Copyright -- PowerDNS.COM B.V. and its contributors
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* In addition, for the avoidance of any doubt, permission is granted to
* link this program with OpenSSL and to (re)distribute the binaries
* produced as the result of such linking.
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "rec-xfr.hh"
#include "dnsname.hh"
LockGuarded<std::multimap<DNSName, ZoneXFR::ZoneWaiter&>> ZoneXFR::condVars;
// Notify all threads tracking the zone name
bool ZoneXFR::notifyZoneTracker(const DNSName& name)
{
auto lock = condVars.lock();
auto [start, end] = lock->equal_range(name);
if (start == end) {
// Did not find any thread tracking that name
return false;
}
while (start != end) {
start->second.stop = true;
start->second.condVar.notify_one();
++start;
}
return true;
}
void ZoneXFR::insertZoneTracker(const DNSName& zoneName, ZoneWaiter& waiter)
{
auto lock = condVars.lock();
lock->emplace(zoneName, waiter);
}
void ZoneXFR::clearZoneTracker(const DNSName& zoneName)
{
// Zap our (and only our) ZoneWaiter struct out of the multimap
auto lock = condVars.lock();
auto [start, end] = lock->equal_range(zoneName);
while (start != end) {
if (start->second.id == std::this_thread::get_id()) {
lock->erase(start);
break;
}
++start;
}
}
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