120 lines
3.3 KiB
C++
120 lines
3.3 KiB
C++
/*
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Copyright (c) 2007, Arvid Norberg
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the distribution.
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* Neither the name of the author nor the names of its
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contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef TORRENT_BANDWIDTH_CHANNEL_HPP_INCLUDED
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#define TORRENT_BANDWIDTH_CHANNEL_HPP_INCLUDED
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#include <boost/integer_traits.hpp>
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#include "libtorrent/assert.hpp"
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namespace libtorrent {
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// member of peer_connection
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struct bandwidth_channel
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{
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static const int inf = boost::integer_traits<int>::const_max;
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bandwidth_channel()
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: m_quota_left(0)
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, m_limit(0)
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{}
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// 0 means infinite
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void throttle(int limit)
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{
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TORRENT_ASSERT(limit >= 0);
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// if the throttle is more than this, we might overflow
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TORRENT_ASSERT(limit < INT_MAX / 31);
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m_limit = limit;
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}
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int throttle() const
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{
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return m_limit;
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}
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int quota_left() const
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{
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if (m_limit == 0) return inf;
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return (std::max)(m_quota_left, 0);
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}
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void update_quota(int dt_milliseconds)
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{
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if (m_limit == 0) return;
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m_quota_left += (m_limit * dt_milliseconds + 500) / 1000;
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if (m_quota_left > m_limit * 3) m_quota_left = m_limit * 3;
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distribute_quota = (std::max)(m_quota_left, 0);
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// fprintf(stderr, "%p: [%d]: + %d limit: %d\n", this, dt_milliseconds, (m_limit * dt_milliseconds + 500) / 1000, m_limit);
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}
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// this is used when connections disconnect with
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// some quota left. It's returned to its bandwidth
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// channels.
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void return_quota(int amount)
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{
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TORRENT_ASSERT(amount >= 0);
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if (m_limit == 0) return;
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m_quota_left += amount;
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}
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void use_quota(int amount)
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{
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TORRENT_ASSERT(amount >= 0);
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if (m_limit == 0) return;
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m_quota_left -= amount;
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}
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// used as temporary storage while distributing
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// bandwidth
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int tmp;
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// this is the number of bytes to distribute this round
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int distribute_quota;
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private:
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// this is the amount of bandwidth we have
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// been assigned without using yet.
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int m_quota_left;
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// the limit is the number of bytes
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// per second we are allowed to use.
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int m_limit;
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};
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}
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#endif
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