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[Bug inetlib/32861] New: SelectableChannel.configureBlocking fails to th

From: debian-gcc at lists dot debian dot org
Subject: [Bug inetlib/32861] New: SelectableChannel.configureBlocking fails to throw IllegalBlockingModeException
Date: 23 Jul 2007 07:22:55 -0000

[forwarded from http://bugs.debian.org/415109]

seen with GCC trunk, 20070730 (cp-0.95):

The java API for SelectableChannel requires that attempts to toggle
blocking mode with configureBlocking fail when a channel is registered.

This test program demonstrates that gcj fails to throw the expected

# first use sun jvm
address@hidden:~/java/listen$ ~/java/jdk1.5.0_10/bin/java test2
        at test2.main(test2.java:19)
# now gcj
address@hidden:~/java/listen$ java test2
address@hidden:~/java/listen$ reportbug -o blocking.bug `which java`

Blocking mode

A selectable channel is either in blocking mode or in non-blocking
mode. In blocking mode, every I/O operation invoked upon the channel
will block until it completes. In non-blocking mode an I/O operation
will never block and may transfer fewer bytes than were requested or
possibly no bytes at all. The blocking mode of a selectable channel may
be determined by invoking its isBlocking method.

Newly-created selectable channels are always in blocking
mode. Non-blocking mode is most useful in conjunction with selector-based
multiplexing. A channel must be placed into non-blocking mode before
being registered with a selector, and may not be returned to blocking
mode until it has been deregistered.

sample code:
import java.net.InetSocketAddress;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.spi.SelectorProvider;

public class test2 {
  public static void main(String[] args) {
    try {
      Selector sel = null;
      InetSocketAddress isa = new InetSocketAddress(2300);
      ServerSocketChannel ssc = ServerSocketChannel.open();


      sel = SelectorProvider.provider().openSelector();
      ssc.register(sel, SelectionKey.OP_ACCEPT);
    } catch(Exception e) {

           Summary: SelectableChannel.configureBlocking fails to throw
           Product: classpath
           Version: 0.95
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: inetlib
        AssignedTo: dog at gnu dot org
        ReportedBy: debian-gcc at lists dot debian dot org


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