forked from premiere/premiere-libtorrent
102 lines
3.1 KiB
C++
102 lines
3.1 KiB
C++
/*
|
|
|
|
Copyright (c) 2007-2013, Arvid Norberg
|
|
All rights reserved.
|
|
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, are permitted provided that the following conditions
|
|
are met:
|
|
|
|
* Redistributions of source code must retain the above copyright
|
|
notice, this list of conditions and the following disclaimer.
|
|
* Redistributions in binary form must reproduce the above copyright
|
|
notice, this list of conditions and the following disclaimer in
|
|
the documentation and/or other materials provided with the distribution.
|
|
* Neither the name of the author nor the names of its
|
|
contributors may be used to endorse or promote products derived
|
|
from this software without specific prior written permission.
|
|
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
|
|
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
*/
|
|
|
|
#ifndef TORRENT_BANDWIDTH_CHANNEL_HPP_INCLUDED
|
|
#define TORRENT_BANDWIDTH_CHANNEL_HPP_INCLUDED
|
|
|
|
#include <boost/integer_traits.hpp>
|
|
#include <boost/cstdint.hpp>
|
|
|
|
#include "libtorrent/assert.hpp"
|
|
|
|
namespace libtorrent {
|
|
|
|
// member of peer_connection
|
|
struct TORRENT_EXTRA_EXPORT bandwidth_channel
|
|
{
|
|
static const int inf = boost::integer_traits<int>::const_max;
|
|
|
|
bandwidth_channel();
|
|
|
|
// 0 means infinite
|
|
void throttle(int limit);
|
|
int throttle() const
|
|
{
|
|
TORRENT_ASSERT_VAL(m_limit < INT_MAX, m_limit);
|
|
return int(m_limit);
|
|
}
|
|
|
|
int quota_left() const;
|
|
void update_quota(int dt_milliseconds);
|
|
|
|
// this is used when connections disconnect with
|
|
// some quota left. It's returned to its bandwidth
|
|
// channels.
|
|
void return_quota(int amount);
|
|
void use_quota(int amount);
|
|
|
|
// this is an optimization. If there is more than one second
|
|
// of quota built up in this channel, just apply it right away
|
|
// instead of introducing a delay to split it up evenly. This
|
|
// should especially help in situations where a single peer
|
|
// has a capacity under the rate limit, but would otherwise be
|
|
// held back by the latency of getting bandwidth from the limiter
|
|
bool need_queueing(int amount)
|
|
{
|
|
if (m_quota_left - amount < m_limit) return true;
|
|
m_quota_left -= amount;
|
|
return false;
|
|
}
|
|
|
|
// used as temporary storage while distributing
|
|
// bandwidth
|
|
int tmp;
|
|
|
|
// this is the number of bytes to distribute this round
|
|
int distribute_quota;
|
|
|
|
private:
|
|
|
|
// this is the amount of bandwidth we have
|
|
// been assigned without using yet.
|
|
boost::int64_t m_quota_left;
|
|
|
|
// the limit is the number of bytes
|
|
// per second we are allowed to use.
|
|
boost::int64_t m_limit;
|
|
};
|
|
|
|
}
|
|
|
|
#endif
|
|
|