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Choose server-side echo ack more carefully

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This commit is contained in:
Keith Winstein
2012-02-04 02:25:10 -05:00
parent 93c5ce2973
commit 5800cb7965
1 changed files with 10 additions and 5 deletions
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transportsender.cpp
+10 -5
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@@ -287,10 +287,15 @@ void TransportSender<MyState>::set_ack_num( uint64_t s_ack_num )
template <class MyState>
uint64_t TransportSender<MyState>::get_late_ack( uint64_t now )
{
ack_history.remove_if( [&]( const pair<uint64_t, uint64_t> &x ) { return x.second < now - ECHO_TIMEOUT; } );
if ( !ack_history.empty() ) {
return ack_history.front().first - 1;
} else { /* every ack has gone past the echo timeout */
return ack_num;
uint64_t newest_echo_ack = 0;
for ( auto i = ack_history.begin(); i != ack_history.end(); i++ ) {
if ( i->second < now - ECHO_TIMEOUT ) {
newest_echo_ack = i->first;
}
}
ack_history.remove_if( [&]( const pair<uint64_t, uint64_t> &x ) { return x.first < newest_echo_ack; } );
return newest_echo_ack;
}