--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/JavaMonitor.st Sun Nov 20 15:28:53 2011 +0000
@@ -0,0 +1,194 @@
+"
+ COPYRIGHT (c) 1996-2011 by Claus Gittinger
+ COPYRIGHT (c) 2010-2011 by Jan Vrany, Jan Kurs and Marcel Hlopko
+ SWING Research Group, Czech Technical University in Prague
+
+ Parts of the code written by Claus Gittinger are under following
+ license:
+
+ 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.
+
+ Parts of the code written at SWING Reasearch Group [1] are MIT licensed:
+
+ Permission is hereby granted, free of charge, to any person
+ obtaining a copy of this software and associated documentation
+ files (the 'Software'), to deal in the Software without
+ restriction, including without limitation the rights to use,
+ copy, modify, merge, publish, distribute, sublicense, and/or sell
+ copies of the Software, and to permit persons to whom the
+ Software is furnished to do so, subject to the following
+ conditions:
+
+ The above copyright notice and this permission notice shall be
+ included in all copies or substantial portions of the Software.
+
+ THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
+ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ OTHER DEALINGS IN THE SOFTWARE.
+
+ [1] Code written at SWING Research Group contain a signature
+ of one of the above copright owners.
+"
+"{ Package: 'stx:libjava' }"
+
+Object subclass:#JavaMonitor
+ instanceVariableNames:'owningProcess processesEntered owningProcessAcquiresCount
+ monitorSema'
+ classVariableNames:''
+ poolDictionaries:''
+ category:'Languages-Java-Support'
+!
+
+!JavaMonitor class methodsFor:'documentation'!
+
+copyright
+"
+ COPYRIGHT (c) 1996-2011 by Claus Gittinger
+ COPYRIGHT (c) 2010-2011 by Jan Vrany, Jan Kurs and Marcel Hlopko
+ SWING Research Group, Czech Technical University in Prague
+
+ Parts of the code written by Claus Gittinger are under following
+ license:
+
+ 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.
+
+ Parts of the code written at SWING Reasearch Group [1] are MIT licensed:
+
+ Permission is hereby granted, free of charge, to any person
+ obtaining a copy of this software and associated documentation
+ files (the 'Software'), to deal in the Software without
+ restriction, including without limitation the rights to use,
+ copy, modify, merge, publish, distribute, sublicense, and/or sell
+ copies of the Software, and to permit persons to whom the
+ Software is furnished to do so, subject to the following
+ conditions:
+
+ The above copyright notice and this permission notice shall be
+ included in all copies or substantial portions of the Software.
+
+ THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
+ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ OTHER DEALINGS IN THE SOFTWARE.
+
+ [1] Code written at SWING Research Group contain a signature
+ of one of the above copright owners.
+
+"
+! !
+
+!JavaMonitor class methodsFor:'instance creation'!
+
+new
+^self basicNew initialize.
+
+ "Created: / 20-11-2011 / 14:30:36 / Marcel Hlopko <hlopkmar@fel.cvut.cz>"
+! !
+
+!JavaMonitor methodsFor:'accessing'!
+
+copyProcessesEntered
+ ^ processesEntered copy.
+
+ "Created: / 20-11-2011 / 14:45:24 / Marcel Hlopko <hlopkmar@fel.cvut.cz>"
+!
+
+processesEntered
+^ processesEntered.
+
+ "Created: / 20-11-2011 / 13:22:15 / Marcel Hlopko <hlopkmar@fel.cvut.cz>"
+! !
+
+!JavaMonitor methodsFor:'initialization'!
+
+initialize
+ owningProcess := nil.
+ processesEntered := IdentitySet new.
+ monitorSema := Semaphore new: 1.
+
+ "Created: / 20-11-2011 / 13:28:28 / Marcel Hlopko <hlopkmar@fel.cvut.cz>"
+! !
+
+!JavaMonitor methodsFor:'public'!
+
+acquire
+ | thisProcess |
+ thisProcess := Processor activeProcess.
+ owningProcess == thisProcess ifTrue: [
+ owningProcessAcquiresCount := owningProcessAcquiresCount + 1.
+ ^ self
+ ].
+ monitorSema wait.
+ owningProcess := thisProcess.
+ owningProcessAcquiresCount := 1.
+
+ "Created: / 20-11-2011 / 13:21:46 / Marcel Hlopko <hlopkmar@fel.cvut.cz>"
+!
+
+enter
+ | thisProcess |
+ thisProcess := Processor activeProcess.
+ processesEntered add: thisProcess.
+ self acquire.
+
+ "Created: / 20-11-2011 / 13:21:42 / Marcel Hlopko <hlopkmar@fel.cvut.cz>"
+!
+
+exit
+ |thisProcess|
+ thisProcess := Processor activeProcess.
+ (self isOwnedBy: thisProcess) ifTrue: [
+ self release.].
+ processesEntered remove: thisProcess.
+
+ "Created: / 20-11-2011 / 13:21:54 / Marcel Hlopko <hlopkmar@fel.cvut.cz>"
+!
+
+release
+ | thisProcess |
+ thisProcess := Processor activeProcess.
+ self assert: thisProcess == owningProcess.
+ owningProcess := nil.
+ monitorSema signal.
+
+ "Created: / 20-11-2011 / 13:21:52 / Marcel Hlopko <hlopkmar@fel.cvut.cz>"
+! !
+
+!JavaMonitor methodsFor:'queries'!
+
+isAcquired
+ ^owningProcess notNil.
+
+ "Created: / 20-11-2011 / 13:22:26 / Marcel Hlopko <hlopkmar@fel.cvut.cz>"
+!
+
+isOwnedBy: aProcess
+ ^owningProcess == aProcess.
+
+ "Created: / 20-11-2011 / 13:23:14 / Marcel Hlopko <hlopkmar@fel.cvut.cz>"
+! !
+
+!JavaMonitor class methodsFor:'documentation'!
+
+version_SVN
+ ^ '$Id$'
+! !