closefuture.sync() deadlock?

[Xiao Li]

Hi,

  I am trying to find a way to close rxtx channel. After running the non-modified netty rxtx example code, I found below line will never finish:

        f.channel().closeFuture().sync();

  The environment is Netty 4.0.0CR9, with RXTX 2.2, on Windows 7.
  It is problem also seen on anybody's computer so it is a issue? Or maybe there is some workaround for it?
  Any help is appreciated! Thanks!

Regards
-Shawn

[Hack Kampbjørn]

That line doesn't close the connection, it just waits until something else calls close and that operation finishes.

Look at RxtxClientHandler for where the connection is supposed to be closed in the that example.

As you are on windows you probably need to adjust /dev/ttyUSB0 to whatever com port you want to talk to.

/Hack

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[Xiao Li]

  Thank you very much Hack,
  You are right, It was the case that I didn't invoke ctx.close().
  Then based on the same code, I commented out ctx.close() and tried to close channel out side of channel handler, with following lines.
            ChannelFuture f = b.connect(new RxtxDeviceAddress("COM11")).sync();
            Thread.sleep(3000);
            f.channel().close();

  Then will get an exception:

java.lang.NullPointerException
    at io.netty.channel.oio.OioByteStreamChannel.available(OioByteStreamChannel.java:77)
    at io.netty.channel.oio.OioByteStreamChannel.doReadBytes(OioByteStreamChannel.java:85)
    at io.netty.channel.oio.AbstractOioByteChannel.doRead(AbstractOioByteChannel.java:85)
    at io.netty.channel.oio.AbstractOioChannel$1.run(AbstractOioChannel.java:40)
    at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:324)
    at io.netty.channel.ThreadPerChannelEventLoop.run(ThreadPerChannelEventLoop.java:69)
    at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:101)
    at java.lang.Thread.run(Unknown Source)

Did I missed anything in this case?

Thanks a lot!
-Shawn

["이희승 (Trustin Lee)"]

Looks like a bug: https://github.com/netty/netty/issues/1514

> On 2013-07-03, at 14:44, Xiao Li <xiao...@gmail.com <javascript:>>

> wrote:
>
>> Hi,
>>
>> I am trying to find a way to close rxtx channel. After running
>> the non-modified netty rxtx example code, I found below line will
>> never finish:
>>
>> f.channel().closeFuture().sync();
>>
>> The environment is Netty 4.0.0CR9, with RXTX 2.2, on Windows 7.
>> It is problem also seen on anybody's computer so it is a issue?
>> Or maybe there is some workaround for it?
>> Any help is appreciated! Thanks!
>>
>> Regards
>> -Shawn
>>
>>
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>>
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>> To unsubscribe from this group and stop receiving emails from it,

>> send an email to netty+un...@googlegroups.com <javascript:>.

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>> <https://groups.google.com/groups/opt_out>.

>>
>>
>
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