- Add lottery and plain round robin cpu policies. I didn't test
them extensively, mind you. Closes task #14. - Added documentation for each cpu policy - Manage extra-exception into PythonCPUPolicy (when the .py file doesn't contain a similarly named class) - Update exception output in GuiBuilder to make it slightly more descriptive git-svn-id: svn://svn.gna.org/svn/sgpemv2/trunk@983 3ecf2c5c-341e-0410-92b4-d18e462d057c
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@ -146,6 +146,8 @@ MOSTLYCLEANFILES += $(proxies) $(wrappers)
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# built-in policies
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policies_PYTHON = \
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src/builtin-policies/fcfs.py \
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src/builtin-policies/lottery.py \
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src/builtin-policies/rr.py \
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src/builtin-policies/rr_priority.py \
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src/builtin-policies/sjf.py
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@ -20,17 +20,19 @@
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from CPUPolicy import CPUPolicy
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import sys
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#from sgpem import policy_sorts_processes
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class fcfs(CPUPolicy) :
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"""First Come First Served"""
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"""First Come First Served scheduling policy.
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The first thread to arrive to the CPU will run until
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it ends. This policy never pre-empts; it is probably
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the simplest of them all."""
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def __init__(self):
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pass;
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def configure(self):
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print 'No options to configure for fcfs'
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pass;
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def is_preemptive(self):
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return False
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@ -0,0 +1,48 @@
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# src/builtin-policies/lottery.py - 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 2 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, write to the Free Software
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# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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from CPUPolicy import CPUPolicy
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from random import randint
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class lottery(CPUPolicy) :
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"""Lottery scheduling
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Every time slice, a thread will be selected from the ready
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queue by random. This policy does not pre-empt before the
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end of the time slice."""
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def __init__(self):
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pass;
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def configure(self):
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param = self.get_parameters()
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param.register_int("Time slice", 1, 10000, True, 2)
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def is_preemptive(self):
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return False
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def get_time_slice(self):
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return self.get_parameters().get_int("Time slice")
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def sort_queue(self, queue):
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sz = queue.size()
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if(sz > 0):
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queue.swap(0, randint(0, sz - 1))
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@ -0,0 +1,50 @@
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# src/builtin-policies/rr_priority.py - 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 2 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, write to the Free Software
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# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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from CPUPolicy import CPUPolicy
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class rr(CPUPolicy) :
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"""Round Robin scheduling policy
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This policy executes a thread for a given amount
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of time (the time-slice value), and then puts it
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at the end of the queue. Does not pre-empt before
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the end of the time slice, since it doesn't take
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priority in account. Use rr_priority for that."""
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def __init__(self):
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pass;
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def configure(self):
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param = self.get_parameters()
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param.register_int("Time slice", 1, 10000, True, 2)
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def is_preemptive(self):
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return False
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def get_time_slice(self):
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return self.get_parameters().get_int("Time slice")
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def sort_queue(self, queue):
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by_ltime = lambda a, b: \
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a.get_last_acquisition() > \
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b.get_last_acquisition()
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self.sort(queue,by_ltime)
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@ -20,9 +20,16 @@
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from CPUPolicy import CPUPolicy
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import sys
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class rr_priority(CPUPolicy) :
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"""Round Robin scheduling policy that takes priority in account.
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No lower priority thread can run if a higher
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priority thread exists. If pre-emptive by priority, a
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higher-priority thread becoming ready even in the middle
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of a time slice will pre-empt the running thread. Else,
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the time slice will have to end before the former can run."""
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def __init__(self):
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pass;
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@ -38,7 +45,6 @@ class rr_priority(CPUPolicy) :
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else:
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return True
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# FIXME pass to a configurable amount
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def get_time_slice(self):
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return self.get_parameters().get_int("Time slice")
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@ -20,18 +20,30 @@
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from CPUPolicy import CPUPolicy
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import sys
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#from sgpem import policy_sorts_processes
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class sjf(CPUPolicy) :
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"""Shortest Job First scheduling policy
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The thread with the shortest required CPU time
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will run until it ends. If pre-emptive is set
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to true, if a shorter thread arrives at the CPU
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at a given moment, it will pre-empt the running
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one. The policy is also called Shortest Remaining
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Time Next in this case."""
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def __init__(self):
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pass;
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def configure(self):
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print 'No options to configure for fcfs'
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params = self.get_parameters()
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params.register_int("Is preemptive?", 0, 1, True, 0)
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def is_preemptive(self):
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return False
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value = self.get_parameters().get_int("Is preemptive?")
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if value == 0:
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return False
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else:
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return True
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def get_time_slice(self):
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return -1
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@ -61,7 +61,9 @@ PythonCPUPolicy::PythonCPUPolicy(const char* name) throw(MalformedPolicyExceptio
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// Now takes the user-defined policy class from pUserCPUPolicyDict
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PyObject* pCPUPolicyClass = PyDict_GetItemString(_upolicy_dict, name);
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assert(pCPUPolicyClass); // FIXME needs stricter checking and exception throwing
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if (pCPUPolicyClass == NULL)
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throw MalformedPolicyException(Glib::ustring(_("Cannot find a class named ")) +
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name + _(" into the corresponding .py file."));
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// Retrieve a description for the policy using the __doc__ attribute
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PyObject* pDescriptionString = PyObject_GetAttrString(pCPUPolicyClass, "__doc__");
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@ -610,8 +610,8 @@ SimulationController::run_simulation_adaptor()
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catch(const MalformedPolicyException& mpe)
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{
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// Show user a dialog
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MessageDialog diag(_("<b>The selected user CPU policy was malformed and didn't run:</b>\n") + Markup::escape_text(mpe.what()),
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true, Gtk::MESSAGE_ERROR, Gtk::BUTTONS_OK, true);
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MessageDialog diag(_("<b>The selected user CPU policy was malformed and failed to sort the queue:</b>\n") +
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Markup::escape_text(mpe.what()), true, Gtk::MESSAGE_ERROR, Gtk::BUTTONS_OK, true);
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diag.run();
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try
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