Fixes bad bug in Java thread handling that caused memory/resource leak.
Threads created for outsude Java system (for example those created when Thread#currentThread
is called from within ordinary Smalltalk process) were never removed from `Threads` map and thus
retained forever. This leaks not only memory but also resources (like files or sockets) if reachavle from
Thread instances.
This commit fixes this by adding an exit action whenever a new Thread is added to the
`Java.Threads` map.
"
COPYRIGHT (c) 1996-2011 by Claus Gittinger
New code and modifications done at SWING Research Group [1]:
COPYRIGHT (c) 2010-2011 by Jan Vrany, Jan Kurs and Marcel Hlopko
SWING Research Group, Czech Technical University in Prague
This software is furnished under a license and may be used
only in accordance with the terms of that license and with the
inclusion of the above copyright notice. This software may not
be provided or otherwise made available to, or used by, any
other person. No title to or ownership of the software is
hereby transferred.
[1] Code written at SWING Research Group contains a signature
of one of the above copright owners. For exact set of such code,
see the differences between this version and version stx:libjava
as of 1.9.2010
"
"{ Package: 'stx:libjava' }"
TestCase subclass:#JavaThreadingTests
instanceVariableNames:''
classVariableNames:''
poolDictionaries:''
category:'Languages-Java-Tests'
!
!JavaThreadingTests class methodsFor:'documentation'!
copyright
"
COPYRIGHT (c) 1996-2011 by Claus Gittinger
New code and modifications done at SWING Research Group [1]:
COPYRIGHT (c) 2010-2011 by Jan Vrany, Jan Kurs and Marcel Hlopko
SWING Research Group, Czech Technical University in Prague
This software is furnished under a license and may be used
only in accordance with the terms of that license and with the
inclusion of the above copyright notice. This software may not
be provided or otherwise made available to, or used by, any
other person. No title to or ownership of the software is
hereby transferred.
[1] Code written at SWING Research Group contains a signature
of one of the above copright owners. For exact set of such code,
see the differences between this version and version stx:libjava
as of 1.9.2010
"
! !
!JavaThreadingTests class methodsFor:'accessing'!
resources
^ Array
with: JavaInitializedResource
with: JavaLibrariesResource
with: JavaTestsResource
"Created: / 30-03-2012 / 13:38:08 / Jan Vrany <jan.vrany@fit.cvut.cz>"
! !
!JavaThreadingTests methodsFor:'tests'!
test_regression_01
"Make sure that java.lang.Thread (& corresponding Smalltalk Process) is removed from
Java:Threads map when thread finished (to avoid resource leak)"
| thread threadProcess activeProcess blocker |
blocker := Semaphore new.
[
thread := JAVA java lang Thread currentThread.
"/ Use Java classVarAt: hack to avoud need for access methods not otherwise
"/ required. They should be cleaned.
threadProcess := (Java classVarAt: #Threads) at: thread.
activeProcess := Processor activeProcess.
blocker signal.
] fork.
blocker wait.
self assert: thread notNil.
self assert: threadProcess notNil.
self assert: threadProcess == activeProcess.
"/ Give exist actions chance to run.
Delay waitForMilliseconds: 100.
self assert: ((Java classVarAt: #Threads) includesKey: thread) not.
"Created: / 08-08-2014 / 09:33:46 / Jan Vrany <jan.vrany@fit.cvut.cz>"
! !