51 lines
1.7 KiB
Python
51 lines
1.7 KiB
Python
# plugins/pyloader/src/builtin-policies/rr.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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