JDK-8034801 : AIX: (ch) Fix synchronization issue in AixPollPort.java
- Type: Bug
- Component: core-libs
- Sub-Component: java.nio
- Priority: P4
- Status: Resolved
- Resolution: Fixed
- OS: aix
- Submitted: 2014-02-12
- Updated: 2014-07-29
- Resolved: 2014-02-14
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| JDK 8 | JDK 9 |
|---|---|
8u20Fixed  |
9 b04Fixed |
Description
On AIX we use the AIXPollPort class to wrap the native pollset functionality. AIXPollPort is based on the Linux EPollPort class. But on AIX there's an extra difficulty - we can not modify (with pollset_ctl()) and query (with pollset_poll()) a pollset concurrently (like this is possible on Linux with epoll_ctl() and epoll_wait()). We have therefore synchronized calls to pollset_ctl() and pollset_poll() by using an extra control queue which handles these calls sequentially. This implementation has an error which can lead to a deadlock if we have a pending pollset_ctl() event in the control queue while the corresponding pollset is already empty.