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POPython threading question - returning control to parent
 

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  1. POPython threading question - returning control to parent
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    <p>Basically, I have a python program which listens for DeviceAdded DBus events (e.g. when someone plugs in a USB drive), and when an event occurs, I want to create a thread which collects metadata on that newly connected device. However, I want to do this asynchronously - that is, allow one thread to keep collecting metadata on the device while returning control to the parent which can keep listening for these events. At the moment, my thread blocks until the collection is finished. Here is a sample of my code:</p> <pre><code>class DeviceAddedListener: def __init__(self): self.bus = dbus.SystemBus() self.hal_manager_obj = self.bus.get_object("org.freedesktop.Hal", "/org$ self.hal_manager = dbus.Interface(self.hal_manager_obj, "org.freedeskto$ self.hal_manager.connect_to_signal("DeviceAdded", self._filter) def _filter(self, udi): device_obj = self.bus.get_object ("org.freedesktop.Hal", udi) device = dbus.Interface(device_obj, "org.freedesktop.Hal.Device") if device.QueryCapability("volume"): return self.capture(device) def capture(self,volume): self.device_file = volume.GetProperty("block.device") self.label = volume.GetProperty("volume.label") self.fstype = volume.GetProperty("volume.fstype") self.mounted = volume.GetProperty("volume.is_mounted") self.mount_point = volume.GetProperty("volume.mount_point") try: self.size = volume.GetProperty("volume.size") except: self.size = 0 print "New storage device detected:" print " device_file: %s" % self.device_file print " label: %s" % self.label print " fstype: %s" % self.fstype if self.mounted: print " mount_point: %s" % self.mount_point response = raw_input("\nWould you like to acquire %s [y/N]? " % self.device_file) if (response == "y"): self.get_meta() thread.start_new_thread(DoSomething(self.device_file)) else: print "Returning to idle" if __name__ == '__main__': from dbus.mainloop.glib import DBusGMainLoop DBusGMainLoop(set_as_default=True) loop = gobject.MainLoop() DeviceAddedListener() loop.run() </code></pre> <p>Any thoughts would be greatly appreciated :) I have excluded the import list to save space</p>
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    1. USWayne Koorts
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      1. POPython threading question - returning control to parent
      1. USKarl Voigtland
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    1. COIt is a lot easier to navigate sample code when you abstract a bit.
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      1. POPython threading question - returning control to parent
      1. USDavid Berger
 

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