2 # NEPI, a framework to manage network experiments
3 # Copyright (C) 2013 INRIA
5 # This program is free software: you can redistribute it and/or modify
6 # it under the terms of the GNU General Public License as published by
7 # the Free Software Foundation, either version 3 of the License, or
8 # (at your option) any later version.
10 # This program is distributed in the hope that it will be useful,
11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 # GNU General Public License for more details.
15 # You should have received a copy of the GNU General Public License
16 # along with this program. If not, see <http://www.gnu.org/licenses/>.
18 # Author: Alina Quereilhac <alina.quereilhac@inria.fr>
30 def __init__(self, timestamp, callback):
32 self.timestamp = timestamp
33 self.callback = callback
35 self.status = TaskStatus.NEW
37 class HeapScheduler(object):
38 """ This class is thread safe.
39 All calls to C Extensions are made atomic by the GIL in the CPython implementation.
40 heapq.heappush, heapq.heappop, and list access are therefore thread-safe """
43 super(HeapScheduler, self).__init__()
46 self._idgen = itertools.count(1)
48 def schedule(self, task):
50 task.id = self._idgen.next()
51 entry = (task.timestamp, task.id, task)
52 self._valid.add(task.id)
53 heapq.heappush(self._queue, entry)
56 def remove(self, tid):
58 self._valid.remove(tid)
65 timestamp, tid, task = heapq.heappop(self._queue)
66 if tid in self._valid: