/usr/share/games/fretsonfire/game/Engine.py is in fretsonfire-game 1.3.110.dfsg2-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# -*- coding: iso-8859-1 -*- #
# #
# Frets on Fire #
# Copyright (C) 2006 Sami Kyöstilä #
# #
# This program 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. #
# #
# This program 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 this program; if not, write to the Free Software #
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, #
# MA 02110-1301, USA. #
#####################################################################
import gc
import Network
import Object
from World import World
from Timer import Timer
from Task import Task
class Engine:
"""Main task scheduler."""
def __init__(self, fps = 60, tickrate = 1.0):
self.tasks = []
self.frameTasks = []
self.timer = Timer(fps = fps, tickrate = tickrate)
self.currentTask = None
self.paused = []
self.running = True
def quit(self):
for t in list(self.tasks + self.frameTasks):
self.removeTask(t)
self.running = False
def addTask(self, task, synchronized = True):
"""
Add a task to the engine.
@param task: L{Task} to add
@type synchronized: bool
@param synchronized: If True, the task will be run with small
timesteps tied to the engine clock.
Otherwise the task will be run once per frame.
"""
if synchronized:
queue = self.tasks
else:
queue = self.frameTasks
if not task in queue:
queue.append(task)
task.started()
def removeTask(self, task):
"""
Remove a task from the engine.
@param task: L{Task} to remove
"""
found = False
queues = self._getTaskQueues(task)
for q in queues:
q.remove(task)
if queues:
task.stopped()
def _getTaskQueues(self, task):
queues = []
for queue in [self.tasks, self.frameTasks]:
if task in queue:
queues.append(queue)
return queues
def pauseTask(self, task):
"""
Pause a task.
@param task: L{Task} to pause
"""
self.paused.append(task)
def resumeTask(self, task):
"""
Resume a paused task.
@param task: L{Task} to resume
"""
self.paused.remove(task)
def enableGarbageCollection(self, enabled):
"""
Enable or disable garbage collection whenever a random garbage
collection run would be undesirable. Disabling the garbage collector
has the unfortunate side-effect that your memory usage will skyrocket.
"""
if enabled:
gc.enable()
else:
gc.disable()
def collectGarbage(self):
"""
Run a garbage collection run.
"""
gc.collect()
def boostBackgroundThreads(self, boost):
"""
Increase priority of background threads.
@param boost True of the scheduling of the main UI thread should be
made fairer to background threads, False otherwise.
"""
self.timer.highPriority = not bool(boost)
def _runTask(self, task, ticks = 0):
if not task in self.paused:
self.currentTask = task
task.run(ticks)
self.currentTask = None
def run(self):
"""Run one cycle of the task scheduler engine."""
if not self.frameTasks and not self.tasks:
return False
for task in self.frameTasks:
self._runTask(task)
for ticks in self.timer.advanceFrame():
for task in self.tasks:
self._runTask(task, ticks)
return True
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