我正在第一次将程序从 PyGTK 转换为 PyGObject 内省,并且遇到了线程障碍。我有一个需要一些时间才能完成的过程,所以我弹出一个带有进度条的对话框,我使用一个线程来完成这个过程并更新进度条。这在 PyGTK 上运行良好,但在转换为 PyGObject 后,我得到了所有通常不正确的线程怪异:程序挂起,但它似乎挂在进程的不同部分等。所以我觉得有些东西已经改变了,但我可以不知道是什么。
这是这个简单的 PyGTK 进度条示例:http://aruiz.typepad.com/siliconisland/2006/04/threads_on_pygt.html 如该页面所示,代码有效。我已经将它转换为 PyGObject 内省,我遇到了与我的程序相同的问题:它挂起,它没有正确更新进度条等。
import threading
import random, time
from gi.repository import Gtk, Gdk
#Initializing the gtk's thread engine
Gdk.threads_init()
class FractionSetter(threading.Thread):
"""This class sets the fraction of the progressbar"""
#Thread event, stops the thread if it is set.
stopthread = threading.Event()
def run(self):
"""Run method, this is the code that runs while thread is alive."""
#Importing the progressbar widget from the global scope
global progressbar
#While the stopthread event isn't setted, the thread keeps going on
while not self.stopthread.isSet() :
# Acquiring the gtk global mutex
Gdk.threads_enter()
#Setting a random value for the fraction
progressbar.set_fraction(random.random())
# Releasing the gtk global mutex
Gdk.threads_leave()
#Delaying 100ms until the next iteration
time.sleep(0.1)
def stop(self):
"""Stop method, sets the event to terminate the thread's main loop"""
self.stopthread.set()
def main_quit(obj):
"""main_quit function, it stops the thread and the gtk's main loop"""
#Importing the fs object from the global scope
global fs
#Stopping the thread and the gtk's main loop
fs.stop()
Gtk.main_quit()
#Gui bootstrap: window and progressbar
window = Gtk.Window()
progressbar = Gtk.ProgressBar()
window.add(progressbar)
window.show_all()
#Connecting the 'destroy' event to the main_quit function
window.connect('destroy', main_quit)
#Creating and starting the thread
fs = FractionSetter()
fs.start()
Gtk.main()
在 Gdk 线程功能的文档中,它强调在运行 gdk_threads_init() 之前必须先运行 g_thread_init(NULL)。但是要运行它,您需要链接一些额外的库。如果我尝试通过自省导入 GLib,然后尝试运行 GLib.thread_init(),则会收到以下错误:
>>> from gi.repository import GLib
>>> GLib.thread_init(None)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/lib/python2.7/site-packages/gi/types.py", line 44, in function
return info.invoke(*args)
glib.GError: Could not locate g_thread_init: `g_thread_init': /usr/lib/libglib-2.0.so.0: undefined symbol: g_thread_init
我认为这是因为没有链接额外的线程库。如果这是我的线程问题的原因,我如何使用 GLib,就好像这些库已经链接一样?