const_iterator Wait(const K &key, OperationEnvironment &env,
TimeoutClock timeout) {
while (true) {
auto i = map.find(key);
if (i != map.end() && !i->second.old)
return const_iterator(i);
if (env.IsCancelled())
return end();
int remaining = timeout.GetRemainingSigned();
if (remaining <= 0)
return end();
cond.timed_wait(*this, remaining);
}
}
bool Fill(TimeoutClock &timeout) {
const auto dest = buffer.Write();
if (dest.IsEmpty())
/* already full */
return false;
const Port::WaitResult wresult =
port.WaitRead(env, timeout.GetRemainingOrZero());
if (wresult != Port::WaitResult::READY)
return false;
const int nbytes = port.Read(dest.data, dest.length);
if (nbytes <= 0)
return false;
buffer.Append(nbytes);
return true;
}
const_iterator Wait(std::unique_lock<Mutex> &lock,
const K &key, OperationEnvironment &env,
TimeoutClock timeout) {
while (true) {
auto i = map.find(key);
if (i != map.end() && !i->second.old)
return const_iterator(i);
if (env.IsCancelled())
return end();
const auto remaining = timeout.GetRemainingSigned();
if (remaining.count() <= 0)
return end();
cond.wait_for(lock, remaining);
}
}