"

 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 monitorSema processesEnteredAccess

		owningProcessAccess'

	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'!

activeProcess

    ^ Processor activeProcess

!

copyProcessesEntered

    ^ processesEntered copy.

    "Created: / 20-11-2011 / 14:45:24 / Marcel Hlopko <hlopkmar@fel.cvut.cz>"

!

processesEntered

    "dont do anything to me, access needs to be sync'd"

    ^ processesEntered.

    "Created: / 20-11-2011 / 13:22:15 / Marcel Hlopko <hlopkmar@fel.cvut.cz>"

! !

!JavaMonitor methodsFor:'atomic'!

addProcess: aProcess

    processesEnteredAccess critical: [processesEntered add: aProcess].

    "Created: / 20-11-2011 / 20:30:07 / Marcel Hlopko <hlopkmar@fel.cvut.cz>"

!

clearOwningProcess

    owningProcessAccess critical: [ owningProcess := nil ].

    "Created: / 20-11-2011 / 20:34:27 / Marcel Hlopko <hlopkmar@fel.cvut.cz>"

!

owningProcess: aProcess

owningProcessAccess critical: [owningProcess := aProcess].

    "Created: / 20-11-2011 / 20:32:26 / Marcel Hlopko <hlopkmar@fel.cvut.cz>"

!

removeProcess: aProcess

processesEnteredAccess critical: [processesEntered remove: aProcess].

    "Created: / 20-11-2011 / 20:28:37 / Marcel Hlopko <hlopkmar@fel.cvut.cz>"

! !

!JavaMonitor methodsFor:'initialization'!

initialize

    owningProcess := nil.

    owningProcessAccess := Semaphore forMutualExclusion.

    processesEntered := OrderedCollection new.

    processesEnteredAccess := Semaphore forMutualExclusion.

    monitorSema := Semaphore new: 1.

    "Created: / 20-11-2011 / 13:28:28 / Marcel Hlopko <hlopkmar@fel.cvut.cz>"

! !

!JavaMonitor methodsFor:'public'!

acquire

    | thisProcess |

    thisProcess := self activeProcess.

    (self isOwnedBy: thisProcess) ifTrue: [ ^ self ].

    monitorSema wait.

    self owningProcess: thisProcess.

    "Created: / 20-11-2011 / 13:21:46 / Marcel Hlopko <hlopkmar@fel.cvut.cz>"

!

enter

    | thisProcess |

    thisProcess := self activeProcess.

    self addProcess: thisProcess.

    self acquire.

    "Created: / 20-11-2011 / 13:21:42 / Marcel Hlopko <hlopkmar@fel.cvut.cz>"

!

exit

    | thisProcess |

    thisProcess := self 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 := self activeProcess.

    self assert: thisProcess == owningProcess.

    self clearOwningProcess.

    monitorSema signal.

    "Created: / 20-11-2011 / 13:21:52 / Marcel Hlopko <hlopkmar@fel.cvut.cz>"

! !

!JavaMonitor methodsFor:'queries'!

isAcquired

    ^ owningProcessAccess critical: [owningProcess notNil].

    "Created: / 20-11-2011 / 13:22:26 / Marcel Hlopko <hlopkmar@fel.cvut.cz>"

!

isOwnedBy: aProcess 

    ^ owningProcessAccess critical: [ owningProcess == aProcess ].

    "Created: / 20-11-2011 / 13:23:14 / Marcel Hlopko <hlopkmar@fel.cvut.cz>"

! !

!JavaMonitor class methodsFor:'documentation'!

version_SVN

    ^ '$Id$'

! !