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Posted to commits@harmony.apache.org by "Mark Hindess (JIRA)" <ji...@apache.org> on 2007/05/22 09:40:16 UTC
[jira] Assigned: (HARMONY-3915) [classlib][nio]
java.nio.channels.Selector.select(long timeout) throws SocketException on
SIGUSR2
[ https://issues.apache.org/jira/browse/HARMONY-3915?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Mark Hindess reassigned HARMONY-3915:
-------------------------------------
Assignee: Mark Hindess
> [classlib][nio] java.nio.channels.Selector.select(long timeout) throws SocketException on SIGUSR2
> -------------------------------------------------------------------------------------------------
>
> Key: HARMONY-3915
> URL: https://issues.apache.org/jira/browse/HARMONY-3915
> Project: Harmony
> Issue Type: Bug
> Components: Classlib
> Environment: linux
> Reporter: Sergey Dmitriev
> Assigned To: Mark Hindess
> Attachments: 3915.patch, 3915_test.patch
>
>
> After fixing JIRA#3888 suddenly SelectorTest.test_wakeup() started to
> fail. So fixed 3888 has discovered another issue with selector.
> As it turned out java.nio.channels.Selector.select([long timeout])
> wakes up and throws SocketException when some thread dies. Actually it
> is all connected with the underlying linux function
> int select(int n, fd_set *readfds, fd_set *writefds,
> fd_set *exceptfds, struct timeval *timeout)
> and SIGUSR2 which is used in DRLVM threading subsystem (any other
> threading event which sends SIGUSR2 can cause the problem with
> select()).
> AFAIK some time ago we had the same problem with SIGUSR2 and this
> issue has been easily resolved with SA_RESTART. Unfortunately in case
> of select() it is not applicable since SA_RESTART functionality in
> select() is "implementation-dependent". Quote:
> int select(int nfds, fd_set *readfds, fd_set *writefds,
> fd_set *errorfds, struct timeval *timeout);
> ...
> ERRORS
> Under the following conditions, select() fails and sets
> errno to:
> ...
> [EINTR]
> The select() function was interrupted before any of the
> selected events occurred and before the timeout
> interval expired. If SA_RESTART has been set for the
> interrupting signal, it is implementation-dependent
> whether select() restarts or returns with [EINTR].
>
> http://www.opengroup.org/onlinepubs/007908799/xsh/select.html
> As it turned out "SUSE LINUX Enterprise Server 9" on my box does not
> support SA_RESTART functionality. So I handled it with cycle. And
> therefore some timeout mathematics comes into play here as well.
> So I believe the code-fix and test-fix for this JIRA and code-fix for
> JIRA #3888 should be committed together since all this stuff intertwined.
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