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36 lines
948 B
36 lines
948 B
import gevent
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#import socket # on windows
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# iwait should not raise `LoopExit: This operation would block forever`
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# or `AssertionError: Invalid switch into ...`
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# if the caller of iwait causes greenlets to switch in between
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# return values
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def worker(i):
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# Have one of them raise an exception to test that case
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if i == 2:
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raise ValueError(i)
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return i
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def main():
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finished = 0
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# Wait on a group that includes one that will already be
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# done, plus some that will finish as we watch
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done_worker = gevent.spawn(worker, "done")
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gevent.joinall((done_worker,))
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workers = [gevent.spawn(worker, i) for i in range(3)]
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workers.append(done_worker)
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for _ in gevent.iwait(workers):
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finished += 1
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# Simulate doing something that causes greenlets to switch;
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# a non-zero timeout is crucial
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gevent.sleep(0.01)
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assert finished == 4
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if __name__ == '__main__':
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main()
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