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# -*- coding: iso-8859-1 -*-
# Copyright (C) 2000-2009 Bastian Kleineidam
#
# 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.
"""
Support for managing threads.
"""
import os
import threading
try:
import win32process
has_win32process = True
except ImportError:
has_win32process = False
from .containers import enum
# generic thread priorities with mappings to Windows and Unix
# priority values
Prio = enum("high", "normal", "low")
_posix_nice_val = {
Prio.high: -5,
Prio.normal: +0,
Prio.low: +10,
}
if has_win32process:
if hasattr(win32process, "BELOW_NORMAL_PRIORITY_CLASS"):
low = win32process.BELOW_NORMAL_PRIORITY_CLASS
else:
low = win32process.IDLE_PRIORITY_CLASS
if hasattr(win32process, "ABOVE_NORMAL_PRIORITY_CLASS"):
high = win32process.ABOVE_NORMAL_PRIORITY_CLASS
else:
high = win32process.HIGH_PRIORITY_CLASS
_nt_prio_val = {
Prio.high: high,
Prio.normal: win32process.NORMAL_PRIORITY_CLASS,
Prio.low: low,
}
del low, high
def set_thread_priority (prio):
"""Set priority of this thread (and thus also for all spawned threads)."""
if os.name == 'nt' and has_win32process:
res = win32process.SetPriorityClass(
win32process.GetCurrentProcess(), _nt_prio_val[prio])
elif os.name == 'posix':
res = os.nice(_posix_nice_val[prio])
else:
res = None
return res
class StoppableThread (threading.Thread):
"""Thread class with a stop() method. The thread itself has to check
regularly for the stopped() condition."""
def __init__ (self):
super(StoppableThread, self).__init__()
self._stop = threading.Event()
def stop (self):
self._stop.set()
def stopped (self):
return self._stop.isSet()
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