问在线程中扭曲运行

EN

from twisted.internet import threads, reactor
from twisted.internet.defer import inlineCallbacks, returnValue
from time import sleep


class SomeClass(object):
    def __init__(self):
        self.working = False

    def set_working(self, is_working):
        self.working = is_working
        print 'Flag set to {}'.format(is_working)

    @inlineCallbacks
    def do_worker_thread(self):

        # I want to make this call on the main thread
        self.set_working(True)

        # I want to do all this garbage on a separate thread and keep trucking on the main thread
        # This mimics some calls in the real code. There is a call to deferToThread and a try
        # except block there.
        def thread_proc():
            try:
                for i in xrange(0, 10):
                    print 'Step {} starting'.format(i)
                    self.execute_step(i)
            except Exception:
                print 'An exception happened'

        yield threads.deferToThread(thread_proc)

        # When the worker thread is done, I want to call back 'on_thread_work_done'
        self.on_thread_work_done()

        returnValue(17)

    def execute_step(self, num):
        sleep(1)
        print 'Worker thread: {}'.format(num)

    def on_thread_work_done(self):
        """I want to be called back when the worker thread is done"""
        self.set_working(False)

    def do_main_thread(self):
        for i in [chr(x) for x in range(ord('a'), ord('z')+1)]:
            print 'Main thread: {}'.format(i)
            sleep(1)

    def thread_done(self, result):
        print 'Thread done: {}'.format(result)

if __name__ == "__main__":
    someClass = SomeClass()
    # Schedule the threaded work
    result = someClass.do_worker_thread().addCallback(someClass.thread_done)
    # Schedule the main thread work
    reactor.callFromThread(someClass.do_main_thread)
    reactor.run()