GObject 信号和 GLib MainLoop

Question

我有一个 GObject 派生的对象，它在某个线程中发出信号，我想在运行 GLib 的 MainLoop 的主线程中处理它们。这是使用 PyGObject:

的示例代码

import gi
from gi.repository import GObject, GLib

class SomeObj(GObject.Object, threading.Thread):
    def __init__(self, device_path, terminate_event):
        GObject.Object.__init__(self)
        threading.Thread.__init__(self)

    def run():
        ...
        self.emit('sig')
        ...

    @GObject.Signal
    def sig(self):
        pass

def callback(instance):
    ...
    # will be called in obj's thread

loop = GLib.MainLoop()
obj = SomeObj()
self.watcher.connect('sig', callback)
obj.start()
loop.run()

callback() 将在 obj 的线程中调用。如何在 loop.run()?

内的主线程中处理信号

Answer 1

从您的 callback 信号处理程序将事件推送到主线程的主上下文：

def callback(instance):
    # None here means the global default GMainContext, which is running in your main thread
    GLib.MainContext.invoke(None, callback_main, instance)

def callback_main(instance):
    # Double check that we’re running in the main thread:
    assert(GLib.MainContext.is_owner(None))
    # … the code you want to be executed in the main thread …

GObject 信号和 GLib MainLoop

GObject signals and GLib MainLoop

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