Android DatagramChannel.register() block execution [duplicate]

Question

I have generic network nonblocking socket library on Java, on default JVM all works fine, but on Android platform next code blocks :

DatagramChannel channel;
. . .
channel.bind(...)
channel.configureBlocking(false);
. . .
channel.register(udpSelector,  SelectionKey.OP_READ | SelectionKey.OP_WRITE);

Blocks on register(), execution can be blocked for 20-40 sec or forever, same only with OP_READ or only with OP_WRITE.

Any hint how to fix ?

Edit : same problem on Android 2.3 and Android 4.0.4

Community · Accepted Answer · 2017-05-23 11:59:02Z

1

This is a duplicate question. Please see Java non-blocking IO selector causing channel register to block which states "The Selector has several documented levels of internal synchronization, and you are running into them all. Call wakeup() on the selector before you call register(). Make sure the select loop works correctly if there are zero selected keys, which is what will happen on wakeup()."

edited May 23, 2017 at 11:59

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answered Feb 25, 2013 at 22:46

Gardner Bickford

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1 Comment

shantanu Over a year ago

Still block. I am trying to register channel in runtime.

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