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94 lines
3.1 KiB
94 lines
3.1 KiB
/* |
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Copyright (c) 2009-2012, 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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#include "libtorrent/bandwidth_limit.hpp" |
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#include <algorithm> |
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namespace libtorrent |
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{ |
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bandwidth_channel::bandwidth_channel() |
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: tmp(0) |
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, distribute_quota(0) |
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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 bandwidth_channel::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 bandwidth_channel::quota_left() const |
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{ |
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if (m_limit == 0) return inf; |
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return (std::max)(int(m_quota_left), 0); |
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} |
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void bandwidth_channel::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 = int((std::max)(m_quota_left, boost::int64_t(0))); |
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// fprintf(stderr, "%p: [%d]: + %"PRId64" limit: %"PRId64" quota_left: %"PRId64"\n", this |
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// , dt_milliseconds, (m_limit * dt_milliseconds + 500) / 1000, m_limit |
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// , m_quota_left); |
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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 bandwidth_channel::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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TORRENT_ASSERT(m_quota_left <= m_quota_left + amount); |
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m_quota_left += amount; |
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} |
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void bandwidth_channel::use_quota(int amount) |
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{ |
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TORRENT_ASSERT(amount >= 0); |
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TORRENT_ASSERT(m_limit >= 0); |
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if (m_limit == 0) return; |
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// fprintf(stderr, "%p: - %"PRId64" limit: %"PRId64" quota_left: %"PRId64"\n", this |
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// , amount, m_limit, m_quota_left); |
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m_quota_left -= amount; |
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} |
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} |
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