99135b1237
git-svn-id: svn://svn.gna.org/svn/sgpemv2/trunk@1329 3ecf2c5c-341e-0410-92b4-d18e462d057c
113 lines
3.2 KiB
C++
113 lines
3.2 KiB
C++
// src/backend/resource_policy_priority_inheritance.cc - Copyright 2005, 2006, University
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// of Padova, dept. of Pure and Applied
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// Mathematics
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//
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// This file is part of SGPEMv2.
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//
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// This is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 3 of the License, or
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// (at your option) any later version.
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//
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// SGPEMv2 is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with SGPEMv2. If not, see http://www.gnu.org/licenses/.
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#include "resource_policy_priority_inheritance.hh"
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#include <sgpemv2/thread.hh>
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using namespace std;
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using namespace sgpem;
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ResourcePolicyPriorityInheritance::~ResourcePolicyPriorityInheritance()
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{}
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void
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ResourcePolicyPriorityInheritance::configure()
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throw(UserInterruptException)
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{
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}
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void
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ResourcePolicyPriorityInheritance::enforce(Environment& /*environment*/, Environment::SubRequestQueue& queue, SubRequest& sr)
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throw(UserInterruptException)
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{
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typedef Environment::SubRequestQueue SubRequestQueue;
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SubRequestQueue old_queue(queue);
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queue.clear();
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// the priority may only rise!
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int pmax = sr.get_request().get_thread().get_current_priority();
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typedef SubRequestQueue::iterator It;
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for (It i = old_queue.begin(); i != old_queue.end(); i++)
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{
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// determine the max priority
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int pthat = (**i).get_request().get_thread().get_current_priority();
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if (pthat < pmax)
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pmax = pthat;
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// allocated ones remain allocated
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if((**i).get_state() == Request::state_allocated)
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queue.push_back(*i);
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}
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int pthis = sr.get_request().get_thread().get_current_priority();
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// assume they are ordered by priority.
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bool inserted = false;
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typedef SubRequestQueue::iterator It;
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for (It i = old_queue.begin(); i != old_queue.end(); i++)
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{
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// allocated ones remain allocated
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if((**i).get_state() != Request::state_allocated)
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{
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// non-allocated ones with lower priority go after the newly arrived
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int pthat = (**i).get_request().get_thread().get_current_priority();
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if(!inserted && pthis <= pthat)
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{
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queue.push_back(&sr);
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inserted = true;
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}
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if (*i != &sr)
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queue.push_back(*i);
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}
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else
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{
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// increase the priority of a the thread to the maximum priority of any process waiting
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int push = pmax - (**i).get_request().get_thread().get_current_priority();
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(**i).get_request().get_thread().set_priority_push(push);
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}
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}
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}
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Glib::ustring
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ResourcePolicyPriorityInheritance::get_description() const
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{
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return _("A resource policy which solves the priority inversion problem by raising the priority of a thread to the maximum relative to the queue.");
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}
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Glib::ustring
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ResourcePolicyPriorityInheritance::get_name() const
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{
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return _("Basic Priority Inheritance Protocol");
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}
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void
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ResourcePolicyPriorityInheritance::activate()
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{
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}
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void
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ResourcePolicyPriorityInheritance::deactivate()
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{
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}
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