2004-02-17 01:18:29 +01:00
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/*
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2004-03-22 15:56:32 +01:00
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Copyright (c) 2003, Magnus Jonsson, Arvid Norberg
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2004-02-17 01:18:29 +01:00
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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/allocate_resources.hpp"
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2004-02-24 20:23:37 +01:00
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#include "libtorrent/size_type.hpp"
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2004-03-22 15:56:32 +01:00
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#include "libtorrent/peer_connection.hpp"
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2004-03-23 23:58:18 +01:00
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#include "libtorrent/torrent.hpp"
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2004-03-22 15:56:32 +01:00
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2004-02-17 01:18:29 +01:00
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#include <cassert>
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#include <algorithm>
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#include <boost/limits.hpp>
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2004-03-22 15:56:32 +01:00
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#include <boost/iterator/transform_iterator.hpp>
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2004-02-17 01:18:29 +01:00
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2004-02-26 13:59:01 +01:00
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#if defined(_MSC_VER) && _MSC_VER < 1300
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#define for if (false) {} else for
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#endif
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2004-02-24 13:45:05 +01:00
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namespace libtorrent
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{
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2004-03-23 23:58:18 +01:00
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int saturated_add(int a, int b)
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2004-02-17 01:18:29 +01:00
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{
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2004-03-23 23:58:18 +01:00
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assert(a >= 0);
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assert(b >= 0);
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assert(std::numeric_limits<int>::max() + std::numeric_limits<int>::max() < 0);
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2004-02-17 01:18:29 +01:00
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2004-03-23 23:58:18 +01:00
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int sum = a + b;
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if(sum < 0)
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sum = std::numeric_limits<int>::max();
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2004-02-17 01:18:29 +01:00
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2004-03-23 23:58:18 +01:00
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assert(sum >= a && sum >= b);
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return sum;
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}
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2004-02-23 23:54:54 +01:00
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2004-03-23 23:58:18 +01:00
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namespace
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{
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2004-02-23 23:54:54 +01:00
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// give num_resources to r,
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// return how how many were actually accepted.
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2004-03-22 15:56:32 +01:00
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int give(resource_request& r, int num_resources)
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2004-02-23 23:54:54 +01:00
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{
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2004-02-24 20:23:37 +01:00
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assert(num_resources >= 0);
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2004-03-27 23:02:31 +01:00
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assert(r.given <= r.max);
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2004-02-23 23:54:54 +01:00
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2004-03-27 23:02:31 +01:00
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int accepted = std::min(num_resources, r.max - r.given);
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2004-02-23 23:54:54 +01:00
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assert(accepted >= 0);
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2004-03-22 15:56:32 +01:00
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r.given += accepted;
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2004-03-27 23:02:31 +01:00
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assert(r.given <= r.max);
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2004-02-23 23:54:54 +01:00
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return accepted;
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}
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#ifndef NDEBUG
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2004-02-24 13:45:05 +01:00
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2004-03-22 15:56:32 +01:00
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template<class It, class T>
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2004-02-24 13:45:05 +01:00
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class allocate_resources_contract_check
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2004-02-23 23:54:54 +01:00
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{
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2004-03-22 15:56:32 +01:00
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int m_resources;
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It m_start;
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It m_end;
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resource_request T::* m_res;
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2004-02-24 13:45:05 +01:00
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public:
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allocate_resources_contract_check(
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2004-03-22 15:56:32 +01:00
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int resources
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, It start
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, It end
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, resource_request T::* res)
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: m_resources(resources)
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, m_start(start)
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, m_end(end)
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, m_res(res)
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2004-02-23 23:54:54 +01:00
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{
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2004-03-22 15:56:32 +01:00
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assert(m_resources >= 0);
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for (It i = m_start, end(m_end); i != end; ++i)
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2004-02-24 13:45:05 +01:00
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{
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2004-03-22 15:56:32 +01:00
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assert(((*i).*m_res).used >= 0);
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2004-03-27 23:02:31 +01:00
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assert(((*i).*m_res).max >= 0);
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2004-03-22 15:56:32 +01:00
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assert(((*i).*m_res).given >= 0);
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2004-02-24 13:45:05 +01:00
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}
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2004-02-23 23:54:54 +01:00
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}
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2004-02-24 13:45:05 +01:00
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~allocate_resources_contract_check()
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2004-02-23 23:54:54 +01:00
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{
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2004-02-24 13:45:05 +01:00
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int sum_given = 0;
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2004-03-27 23:02:31 +01:00
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int sum_max = 0;
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2004-03-22 15:56:32 +01:00
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for (It i = m_start, end(m_end); i != end; ++i)
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2004-02-24 13:45:05 +01:00
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{
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2004-03-27 23:02:31 +01:00
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assert(((*i).*m_res).max >= 0);
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2004-03-22 15:56:32 +01:00
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assert(((*i).*m_res).given >= 0);
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2004-03-27 23:02:31 +01:00
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assert(((*i).*m_res).given <= ((*i).*m_res).max);
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2004-02-24 13:45:05 +01:00
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2004-03-22 15:56:32 +01:00
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sum_given = saturated_add(sum_given, ((*i).*m_res).given);
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2004-03-27 23:02:31 +01:00
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sum_max = saturated_add(sum_max, ((*i).*m_res).max);
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2004-02-24 13:45:05 +01:00
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}
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2004-03-27 23:02:31 +01:00
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assert(sum_given == std::min(m_resources, sum_max));
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2004-02-23 23:54:54 +01:00
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}
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2004-02-24 13:45:05 +01:00
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};
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2004-02-23 23:54:54 +01:00
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#endif
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2004-03-22 15:56:32 +01:00
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template<class It, class T>
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void allocate_resources_impl(
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int resources
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, It start
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, It end
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, resource_request T::* res)
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2004-02-17 01:18:29 +01:00
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{
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2004-03-22 15:56:32 +01:00
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#ifndef NDEBUG
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allocate_resources_contract_check<It, T> contract_check(
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resources
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, start
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, end
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, res);
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#endif
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if(resources == std::numeric_limits<int>::max())
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{
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// No competition for resources.
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// Just give everyone what they want.
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for (It i = start; i != end; ++i)
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{
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2004-03-27 23:02:31 +01:00
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((*i).*res).given = ((*i).*res).max;
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2004-03-22 15:56:32 +01:00
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}
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2004-02-23 23:54:54 +01:00
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return;
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2004-03-22 15:56:32 +01:00
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}
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// Resources are scarce
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2004-02-23 23:54:54 +01:00
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2004-03-27 23:02:31 +01:00
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int sum_max = 0;
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int sum_min = 0;
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2004-03-22 15:56:32 +01:00
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for (It i = start; i != end; ++i)
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{
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2004-03-27 23:02:31 +01:00
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sum_max = saturated_add(sum_max, ((*i).*res).max);
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assert(((*i).*res).min < std::numeric_limits<int>::max());
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assert(((*i).*res).min >= 0);
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assert(((*i).*res).min <= ((*i).*res).max);
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sum_min += ((*i).*res).min;
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((*i).*res).given = ((*i).*res).min;
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2004-03-22 15:56:32 +01:00
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}
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2004-02-17 01:18:29 +01:00
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2004-03-27 23:02:31 +01:00
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if (resources == 0 || sum_max == 0)
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2004-02-23 23:54:54 +01:00
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return;
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2004-03-27 23:02:31 +01:00
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int resources_to_distribute = std::min(resources, sum_max) - sum_min;
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assert(resources_to_distribute >= 0);
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2004-02-23 23:54:54 +01:00
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2004-03-22 15:56:32 +01:00
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while (resources_to_distribute > 0)
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2004-02-24 13:45:05 +01:00
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{
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2004-03-22 15:56:32 +01:00
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size_type total_used = 0;
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size_type max_used = 0;
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for (It i = start; i != end; ++i)
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2004-02-24 20:23:37 +01:00
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{
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2004-03-22 15:56:32 +01:00
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resource_request& r = (*i).*res;
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2004-03-27 23:02:31 +01:00
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if(r.given == r.max) continue;
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2004-02-24 20:23:37 +01:00
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2004-03-27 23:02:31 +01:00
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assert(r.given < r.max);
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2004-02-24 20:23:37 +01:00
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2004-03-22 15:56:32 +01:00
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max_used = std::max(max_used, (size_type)r.used + 1);
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total_used += (size_type)r.used + 1;
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2004-02-24 13:45:05 +01:00
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}
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2004-02-24 20:23:37 +01:00
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2004-03-22 15:56:32 +01:00
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size_type kNumer = resources_to_distribute;
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size_type kDenom = total_used;
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2004-02-24 20:23:37 +01:00
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2004-03-22 15:56:32 +01:00
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if (kNumer * max_used <= kDenom)
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2004-02-24 20:23:37 +01:00
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{
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2004-03-22 15:56:32 +01:00
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kNumer = 1;
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kDenom = max_used;
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2004-02-24 20:23:37 +01:00
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}
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2004-03-22 15:56:32 +01:00
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for (It i = start; i != end && resources_to_distribute > 0; ++i)
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2004-02-25 00:48:02 +01:00
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{
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2004-03-22 15:56:32 +01:00
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resource_request& r = (*i).*res;
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2004-03-27 23:02:31 +01:00
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if(r.given == r.max) continue;
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2004-02-25 00:48:02 +01:00
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2004-03-27 23:02:31 +01:00
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assert(r.given < r.max);
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2004-02-25 00:48:02 +01:00
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2004-03-22 15:56:32 +01:00
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size_type used = (size_type)r.used + 1;
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2004-02-25 00:48:02 +01:00
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size_type toGive = used * kNumer / kDenom;
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2004-03-22 15:56:32 +01:00
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if(toGive > std::numeric_limits<int>::max())
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toGive = std::numeric_limits<int>::max();
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resources_to_distribute -= give(r, (int)toGive);
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2004-02-25 00:48:02 +01:00
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}
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2004-03-22 15:56:32 +01:00
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2004-02-24 20:23:37 +01:00
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assert(resources_to_distribute >= 0);
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2004-02-24 13:45:05 +01:00
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}
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2004-03-22 15:56:32 +01:00
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}
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2004-02-24 20:23:37 +01:00
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2004-03-22 15:56:32 +01:00
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peer_connection& pick_peer(
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std::pair<boost::shared_ptr<socket>, boost::shared_ptr<peer_connection> > const& p)
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{
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return *p.second;
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2004-02-17 01:18:29 +01:00
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}
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2004-03-22 15:56:32 +01:00
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2004-03-23 23:58:18 +01:00
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peer_connection& pick_peer2(
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std::pair<address, peer_connection*> const& p)
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{
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return *p.second;
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}
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2004-03-22 15:56:32 +01:00
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2004-03-23 23:58:18 +01:00
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torrent& deref(std::pair<sha1_hash, boost::shared_ptr<torrent> > const& p)
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{
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return *p.second;
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}
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2004-03-22 15:56:32 +01:00
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2004-03-23 23:58:18 +01:00
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} // namespace anonymous
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/*
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2004-03-22 15:56:32 +01:00
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void allocate_resources(
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int resources
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, std::map<boost::shared_ptr<socket>, boost::shared_ptr<peer_connection> >& c
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, resource_request peer_connection::* res)
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{
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typedef std::map<boost::shared_ptr<socket>, boost::shared_ptr<peer_connection> >::iterator orig_iter;
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typedef std::pair<boost::shared_ptr<socket>, boost::shared_ptr<peer_connection> > in_param;
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typedef boost::transform_iterator<peer_connection& (*)(in_param const&), orig_iter> new_iter;
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allocate_resources_impl(
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resources
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, new_iter(c.begin(), &pick_peer)
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, new_iter(c.end(), &pick_peer)
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, res);
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2004-02-17 01:18:29 +01:00
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}
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2004-03-23 23:58:18 +01:00
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*/
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void allocate_resources(
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int resources
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, std::map<sha1_hash, boost::shared_ptr<torrent> >& c
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, resource_request torrent::* res)
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{
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typedef std::map<sha1_hash, boost::shared_ptr<torrent> >::iterator orig_iter;
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typedef std::pair<sha1_hash, boost::shared_ptr<torrent> > in_param;
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typedef boost::transform_iterator<torrent& (*)(in_param const&), orig_iter> new_iter;
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allocate_resources_impl(
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resources
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, new_iter(c.begin(), &deref)
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, new_iter(c.end(), &deref)
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, res);
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}
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void allocate_resources(
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int resources
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, std::map<address, peer_connection*>& c
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, resource_request peer_connection::* res)
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{
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typedef std::map<address, peer_connection*>::iterator orig_iter;
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typedef std::pair<address, peer_connection*> in_param;
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typedef boost::transform_iterator<peer_connection& (*)(in_param const&), orig_iter> new_iter;
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allocate_resources_impl(
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resources
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, new_iter(c.begin(), &pick_peer2)
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, new_iter(c.end(), &pick_peer2)
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, res);
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}
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2004-03-22 15:56:32 +01:00
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} // namespace libtorrent
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