/usr/lib/python2.7/dist-packages/ginga/gw/GwMain.py is in python-ginga 2.6.1-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# GwMain.py -- application threading help routines.
#
# This is open-source software licensed under a BSD license.
# Please see the file LICENSE.txt for details.
#
from __future__ import print_function
import sys, traceback
import os
import threading
import logging
import time
import ginga.util.six as six
if six.PY2:
import thread
import Queue
else:
import _thread as thread
import queue as Queue
from ginga.util.six.moves import filter
from ginga.misc import Task, Future, Callback
from collections import deque
class GwMain(Callback.Callbacks):
def __init__(self, queue=None, logger=None, ev_quit=None, app=None,
thread_pool=None):
Callback.Callbacks.__init__(self)
self.enable_callback('shutdown')
# You can pass in a queue if you prefer to do so
if not queue:
queue = Queue.PriorityQueue()
#queue = Queue.Queue()
self.gui_queue = queue
# You can pass in a logger if you prefer to do so
if logger is None:
logger = logging.getLogger('GwMain')
self.logger = logger
if not ev_quit:
ev_quit = threading.Event()
self.ev_quit = ev_quit
self.app = app
# Mark our thread id
#self.gui_thread_id = None
self.gui_thread_id = thread.get_ident()
self.threadPool = thread_pool
# For asynchronous tasks on the thread pool
self.tag = 'master'
self.shares = ['threadPool', 'logger']
self.oneshots = {}
def get_widget(self):
return self.app
def get_threadPool(self):
return self.threadPool
def _execute_future(self, future):
# Execute the GUI method
try:
try:
res = future.thaw(suppress_exception=False)
except Exception as e:
self.logger.error("gui event loop error: %s" % str(e))
try:
(type, value, tb) = sys.exc_info()
tb_str = "".join(traceback.format_tb(tb))
self.logger.error("Traceback:\n%s" % (tb_str))
except Exception:
self.logger.error("Traceback information unavailable.")
future.resolve(e)
except Exception as e2:
self.logger.error("Exception resolving future: %s" % str(e2))
def update_pending(self, timeout=0.0, elapsed_max=0.02):
self.assert_gui_thread()
# Process "out-of-band" events
# self.logger.debug("1. processing out-of-band GUI events")
try:
self.app.process_events()
except Exception as e:
self.logger.error(str(e))
# Process "in-band" GUI events
# self.logger.debug("2. processing approx %d in-band GUI events" % (
# self.gui_queue.qsize()))
done = False
time_start = time.time()
while not done:
try:
future = self.gui_queue.get(block=True,
timeout=timeout)
self._execute_future(future)
except Queue.Empty:
done = True
if time.time() - time_start > elapsed_max:
done = True
# Execute all the one-shots
# self.logger.debug("3. processing one-shot GUI events")
deqs = list(filter(lambda deq: len(deq) > 0, self.oneshots.values()))
for deq in deqs:
try:
future = deq.pop()
self._execute_future(future)
except IndexError:
continue
# Process "out-of-band" events, again
# self.logger.debug("4. processing out-of-band GUI events")
try:
self.app.process_events()
except Exception as e:
self.logger.error(str(e))
# self.logger.debug("5. done")
def gui_do_priority(self, priority, method, *args, **kwdargs):
"""General method for asynchronously calling into the GUI.
It makes a future to call the given (method) with the given (args)
and (kwdargs) inside the gui thread. If the calling thread is a
non-gui thread the future is returned.
"""
future = Future.Future(priority=priority)
future.freeze(method, *args, **kwdargs)
self.gui_queue.put(future)
my_id = thread.get_ident()
if my_id != self.gui_thread_id:
return future
def gui_do(self, method, *args, **kwdargs):
return self.gui_do_priority(0, method, *args, **kwdargs)
def gui_call(self, method, *args, **kwdargs):
"""General method for synchronously calling into the GUI.
This waits until the method has completed before returning.
"""
my_id = thread.get_ident()
if my_id == self.gui_thread_id:
return method(*args, **kwdargs)
else:
future = self.gui_do(method, *args, **kwdargs)
return future.wait()
def gui_do_future(self, future):
self.gui_queue.put(future)
return future
def gui_do_oneshot(self, catname, method, *args, **kwdargs):
if not catname in self.oneshots:
deq = self.oneshots.setdefault(catname, deque([], 1))
else:
deq = self.oneshots[catname]
future = Future.Future()
future.freeze(method, *args, **kwdargs)
deq.append(future)
my_id = thread.get_ident()
if my_id != self.gui_thread_id:
return future
def nongui_do(self, method, *args, **kwdargs):
task = Task.FuncTask(method, args, kwdargs, logger=self.logger)
return self.nongui_do_task(task)
def nongui_do_cb(self, tup, method, *args, **kwdargs):
task = Task.FuncTask(method, args, kwdargs, logger=self.logger)
task.register_callback(tup[0], args=tup[1:])
return self.nongui_do_task(task)
def nongui_do_future(self, future):
task = Task.FuncTask(future.thaw, (), {}, logger=self.logger)
return self.nongui_do_task(task)
def nongui_do_task(self, task):
try:
task.init_and_start(self)
return task
except Exception as e:
self.logger.error("Error starting task: %s" % (str(e)))
raise(e)
def is_gui_thread(self):
my_id = thread.get_ident()
return my_id == self.gui_thread_id
def assert_gui_thread(self):
my_id = thread.get_ident()
assert my_id == self.gui_thread_id, \
Exception("Non-GUI thread (%d) is executing GUI code!" % (
my_id))
def assert_nongui_thread(self):
my_id = thread.get_ident()
assert my_id != self.gui_thread_id, \
Exception("GUI thread (%d) is executing non-GUI code!" % (
my_id))
def mainloop(self, timeout=0.001):
# Mark our thread id
self.gui_thread_id = thread.get_ident()
while not self.ev_quit.isSet():
self.update_pending(timeout=timeout)
def gui_quit(self):
"Call this to cause the GUI thread to quit the mainloop."""
self.ev_quit.set()
self.make_callback('shutdown')
self.app.process_end()
def _quit(self):
self.gui_quit()
# END
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