[7u4] Request for approval for CR 7118809: rcache deadlock

[Weijun Wang]

Hi All

This is a request to backport a jdk8 fix into jdk7u4.

CR: 7118809: rcache deadlock
Weblink: http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=7118809

Description:

CacheTable.put() operates on ReplayCache inside it, and 
ReplayCache.put() operates on CacheTable containing it, and both methods 
are synchronized and using thread-safe Hashtable. Therefore there might 
be a deadlock when both methods are calling into the other one in two 
threads at the same time.

The fix is to remove the "call-up" side so that ReplayCache will not 
call CacheTable methods. It's already included in jdk8 as:

    Mon Jan 16 10:10:56 2012 +0800
    changeset 4896: e8e08d46cc37
    Reviewed-by: valeriep

The patch for jdk7u4 is a little different at

    http://cr.openjdk.java.net/~weijun/7118809/7u4/webrev.00/

and it has been reviewed by Valerie Peng (valeriep).

I intend to push it to

    ssh://hg.openjdk.java.net/jdk7u/jdk7u-dev-gate/jdk

Thanks
Weijun