#!/usr/bin/env python
##############################################################################
##
# This file is part of Sardana
##
# http://www.sardana-controls.org/
##
# Copyright 2011 CELLS / ALBA Synchrotron, Bellaterra, Spain
##
# Sardana is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
##
# Sardana 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 Lesser General Public License for more details.
##
# You should have received a copy of the GNU Lesser General Public License
# along with Sardana. If not, see <http://www.gnu.org/licenses/>.
##
##############################################################################
"""This module contains the function to access sardana thread pool"""
__all__ = ["get_thread_pool"]
__docformat__ = 'restructuredtext'
import threading
from taurus.core.util.threadpool import ThreadPool, Worker
__thread_pool_lock = threading.Lock()
__thread_pool = None
class OmniWorker(Worker):
def run(self):
try:
import tango
except ImportError:
Worker.run(self)
# Tango is not thread safe when using threading.Thread. One must
# use omni threads instead. This was confirmed for parallel
# event subscriptions in PyTango#307. Use EnsureOmniThread introduced
# in PyTango#327 whenever available.
else:
if hasattr(tango, "EnsureOmniThread"):
with tango.EnsureOmniThread():
Worker.run(self)
else:
import taurus
taurus.warning("Your Sardana system is affected by bug "
"tango-controls/pytango#307. Please use "
"PyTango with tango-controls/pytango#327.")
Worker.run(self)
[docs]def get_thread_pool():
"""Returns the global pool of threads for Sardana
:return: the global pool of threads object
:rtype: taurus.core.util.ThreadPool"""
global __thread_pool
global __thread_pool_lock
with __thread_pool_lock:
if __thread_pool is None:
# protect older versions of Taurus (without the worker_cls
# argument) remove it whenever we bump Taurus dependency
try:
__thread_pool = ThreadPool(name="SardanaTP", Psize=10,
worker_cls=OmniWorker)
except TypeError:
import taurus
taurus.warning("Your Sardana system is affected by bug "
"tango-controls/pytango#307. Please use "
"Taurus with taurus-org/taurus#1081.")
__thread_pool = ThreadPool(name="SardanaTP", Psize=10)
return __thread_pool