- I forgot to include the policy.

git-svn-id: svn://svn.gna.org/svn/sgpemv2/trunk@1124 3ecf2c5c-341e-0410-92b4-d18e462d057c

src/backend/resource_policy_priority_inheritance.cc

@@ -0,0 +1,119 @@
+// src/backend/resource_policy_priority_inheritance.cc - Copyright 2005, 2006, University
+//               of Padova, dept. of Pure and Applied
+//               Mathematics
+//
+// This file is part of SGPEMv2.
+//
+// This is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 2 of the License, or
+// (at your option) any later version.
+//
+// SGPEMv2 is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with SGPEMv2; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+
+#include <sgpemv2/resource_policy_priority_inheritance.hh>
+#include <sgpemv2/thread.hh>
+
+using namespace std;
+using namespace sgpem;
+
+ResourcePolicyPriorityInheritance::~ResourcePolicyPriorityInheritance()
+{}
+
+
+PolicyParameters&
+ResourcePolicyPriorityInheritance::get_parameters()
+{
+  return _parameters;
+}
+
+void
+ResourcePolicyPriorityInheritance::configure()
+ throw(UserInterruptException)
+{
+}
+
+void
+ResourcePolicyPriorityInheritance::enforce(Environment& environment, Environment::SubRequestQueue& queue, SubRequest& sr)
+ throw(UserInterruptException)
+{
+  typedef Environment::SubRequestQueue SubRequestQueue;
+
+  SubRequestQueue old_queue(queue);
+  queue.clear();
+
+  // the priority may only rise!  
+  int pmax = sr.get_request().get_thread().get_current_priority();
+
+
+  typedef SubRequestQueue::iterator It;
+  for (It i = old_queue.begin(); i != old_queue.end(); i++)
+  {
+    // determine the max priority
+    int pthat = (**i).get_request().get_thread().get_current_priority();
+    if (pthat < pmax)
+      pmax = pthat;
+    // allocated ones remain allocated
+    if((**i).get_state() == Request::state_allocated)
+      queue.push_back(*i);
+  }
+
+  int pthis = sr.get_request().get_thread().get_current_priority();
+
+  // assume they are ordered by priority.
+  bool inserted = false;
+  typedef SubRequestQueue::iterator It;
+  for (It i = old_queue.begin(); i != old_queue.end(); i++)
+  {
+    // allocated ones remain allocated
+    if((**i).get_state() != Request::state_allocated)
+    {
+      // non-allocated ones with lower priority go after the newly arrived
+      int pthat = (**i).get_request().get_thread().get_current_priority();
+      if(!inserted &&  pthis <=  pthat)
+      {
+        queue.push_back(&sr);
+        inserted = true;
+      }
+      if (*i != &sr)
+        queue.push_back(*i);
+    }
+    else
+    {
+      // increase the priority of a the thread to the maximum priority of any process waiting
+      int push = pmax - (**i).get_request().get_thread().get_current_priority();
+      (**i).get_request().get_thread().set_priority_push(push);
+
+    }
+  }
+}
+
+Glib::ustring
+ResourcePolicyPriorityInheritance::get_description() const
+{
+  return "A resource policy which solves the priority inversion problem by raising the priority of a thread to the maximum relative to the queue.";
+}
+
+Glib::ustring
+ResourcePolicyPriorityInheritance::get_name() const
+{
+  return "Basic Priority Inheritance Protocol";
+}
+
+
+void
+ResourcePolicyPriorityInheritance::activate()
+{
+}
+
+void
+ResourcePolicyPriorityInheritance::deactivate()
+{
+}

src/backend/sgpemv2/resource_policy_priority_inheritance.hh

@@ -0,0 +1,92 @@
+// src/backend/resource_policy_priority_inheritance.hh - Copyright 2005, 2006, University
+//               of Padova, dept. of Pure and Applied
+//               Mathematics
+//
+// This file is part of SGPEMv2.
+//
+// This is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 2 of the License, or
+// (at your option) any later version.
+//
+// SGPEMv2 is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with SGPEMv2; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+
+#ifndef RESOURCE_POLICY_INHERITANCE_HH
+#define RESOURCE_POLICY_INHERITANCE_HH 1
+
+#include "config.h"
+#include "gettext.h"
+
+#include "glibmm/ustring.h"
+
+#include <sgpemv2/resource_policy.hh>
+
+#include <sgpemv2/policy_parameters.hh>
+#include <sgpemv2/user_interrupt_exception.hh>
+
+namespace sgpem
+{
+  class ResourcePolicyPriorityInheritance;
+
+  /** \brief
+  It's a Strategy wich stay for a resource allocating algorithm.
+  It implements the related resource allocation policy.
+  */
+  class SG_DLLEXPORT ResourcePolicyPriorityInheritance : public ResourcePolicy
+  {
+  public:
+    virtual ~ResourcePolicyPriorityInheritance();
+
+    /**
+      Initialize the inner components of the policy.
+
+      Because it's a pure virtual method, must be re-implemented 
+      in concrete derived classes.
+     */
+    virtual void configure() throw(UserInterruptException);
+
+    /**
+      Mixes the queues. 
+     
+      Because it's a pure virtual method, must be re-implemented 
+      in concrete derived classes.
+     */
+    virtual void enforce(Environment& environment, Environment::SubRequestQueue& queue, SubRequest& sr) throw(UserInterruptException);
+
+    /**
+      Gets a string description of the policy.
+
+      Because it's a pure virtual method, must be re-implemented 
+      in concrete derived classes.
+      \return String description of the policy.
+     */
+    virtual Glib::ustring get_description() const;
+
+    virtual Glib::ustring get_name() const;
+
+    virtual void activate();
+
+    virtual void deactivate();
+
+    /**
+      Gets the parameters related with this policy.
+
+      \return The policy parameters.
+     */
+    PolicyParameters& get_parameters();
+
+  protected:
+    PolicyParameters _parameters;
+  };
+
+}//~ namespace sgpem
+
+
+#endif