logging fixes for last pre-ZBB JDK7-TL snapshot (6977677, 7016208, 7041595)

[Mandy Chung]

  Dan,

Great that you knocked down another hard-to-reproduce bug and your 
simple regression test.  The comments you add are really helpful.

Logger.java
    Looks good.   The removal of the synchronization required by 
Logger.getLogger
    fixes the deadlock issue.

LogManager.java
     Retrying in a while loop is one way to fix weak ref / gc timing issue.
     What about if you refactor the addLogger method to add a new private
     private method equivalent to addLogger (say add(Logger)) that will 
return
     logger if added successfully or null if not.

     The addLogger method will return add(logger) != logger.  The 
synchronization
     will be done in the new add method.

     Would this fix 7016208?    It seems to me that addLogger returning 
boolean
     is the cause for this bug.

Mandy

On 05/15/11 11:40, Daniel D. Daugherty wrote:
> Greetings,
>
> The final pre-ZBB JDK7-TL snapshot is happening @ 1700 PT on
> Monday, May 14, 2011. This snapshot is targeted for JDK7-B143
> or JDK7-B144 (I'm not sure which). Yes, we're still trying to
> figure out how to merge our JDK & HotSpot Express processes
> with Oracle processes. Please be patient while we iron out the
> wrinkles...
>
> I have three bug fixes for the java.util.logging area:
>
>    6977677 3/2 Deadlock on logging subsystem initialization
>    7016208 4/3 null sometimes returned by java.util.logging.Logger.
>                getLogger(String name) in -server -Xcomp
>    7041595 4/4 add lost test for 6487638
>
> 6977677 is a deadlock between java.util.logging.Logger.getLogger()
> and LogManager.<clinit> via a PlatformLogger. This fix involves:
>
>    src/share/classes/java/util/logging/Logger.java
>    test/java/util/logging/LoggingDeadlock4.java
>
> Mandy, I would like your review of the above bug fix.
>
> 7016208 is an unexpected null return from Logger.getLogger() due to
> the lack of a strong reference. This fix involves:
>
>    src/share/classes/java/util/logging/LogManager.java
>
> Tom R., I would like your review of the above bug fix.
>
> 7041595 is just pushing a Logging deadlock test that got lost a
> long time ago. This fix involves:
>
>    test/java/util/logging/LoggingDeadlock3.java
>    test/java/util/logging/LoggingDeadlock3.props
>
> Because I'm fixing a deadlock in 6977677, I wanted to make sure
> that this Logging deadlock test was back in the mix.
>
> Here is the webrev URL:
>
>    http://cr.openjdk.java.net/~dcubed/logging-batch-20110515-webrev/0/
>
> The comments that I added to the code changes should make the
> reason(s) for the code changes pretty self explanatory.
>
> These changes have been run through JPRT and pass the "jdk_util"
> tests on all platforms. I have also run SDK/JDK logging tests
> and the VM/NSK logging tests on the following configs:
>
>    Solaris X86 * {Client VM, Server VM} product * {-Xmixed, -Xcomp}
>    WinXP * {Client VM, Server VM} product * {-Xmixed, -Xcomp}
>
> Here is the summary from Solaris X86:
>
> Summary of Test Results (8 result dirs)
> =========================================
>    all executed: 2264  all passed: 2264  all ignored: 0  all failed: 0
>    time: 0 hour(s) 17 minute(s)
>
> Here is the partial summary (6 of 8) from WinXP:
>
> Summary of Test Results (6 result dirs)
> =========================================
>    all executed: 1160  all passed: 1160  all ignored: 0  all failed: 0
>    time: 1 hour(s) 0 minute(s)
>
> The last two VM/NSK test runs are still going; yes, WinXP is slower than
> Solaris X86...
>
> Thanks, in advance, for any reviews.
>
> Dan
>