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ID Category Severity Reproducibility Date Submitted Last Update
0007546 [Squeak] Kernel major always 06-13-10 08:08 02-06-11 23:48
Reporter JoachimGeidel View Status public  
Assigned To leves
Priority normal Resolution fixed  
Status closed   Product Version 4.1
Summary 0007546: WeakRegistry deadlock during finalization
Description In Squeak 4.1, I encountered a deadlock problem related to Squeak's current
WeakRegistry implementation when the JVM is started. This problem
disappeared when I changed the finalizationProcess of WeakArray such that it
runs at systemBackgroundPriority instead of userBackgroundPriority. However, normal processes (with priority 40) could starve the finalization
process if it's priority were <= 40 (#systemBackgroundPriority is 20).

To reproduce, load JNIPort into Squeak 4.1, and start a JVM as described on http://www.squeaksource.com/JNIPort.html. [^] At the point where the deadlock occurs, the finalizationProcess sends #wait to the accessLock of WeakRegistry, then the Process which initializes the JVM waits on the same Semaphore until the process is interrupted by a user interrupt. After proceeding, the interrupted process proceeds, signals the accessLock, and only after this, the finalizationProcess finishes finalizeValues and signals the accessLock. Lowering the priority of the finalizationProcess works around this problem, but probably simply by completely stopping finalization until the JVM initialization has finished.
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- Notes
(0013818 - 28 - 28 - 28 - 28 - 28 - 28)
leves
06-19-10 20:41

Fixed in Collections-ul.365.
 

- Issue History
Date Modified Username Field Change
06-13-10 08:08 JoachimGeidel New Issue
06-19-10 20:41 leves Note Added: 0013818
06-19-10 20:42 leves Status new => resolved
06-19-10 20:42 leves Fixed in Version  => trunk
06-19-10 20:42 leves Resolution open => fixed
06-19-10 20:42 leves Assigned To  => leves
02-06-11 23:48 leves Status resolved => closed


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