Threaded Sudoku solver - Assignment question (NOT LOOKING FOR ANSWERS )

Hi All,
I'm going to be upfront and point out this is an assignment that i'm currently working on and i'm not receiving much in the way of feedback from the class forums.
This is currently a 4th year OO assignment for UNSW Australia.
What I am having trouble doing is figuring out where my program is deadlocking or dying. There have been a number of requirements set out by the assignment, basically no synchronization, no locking. We are able to use volatile, atomic, immutable and thread-local objects. The task is to find all solution for a given N x N sudoku problem using X number of threads. I have successfully built the solver (X = 0) without too much trouble and I thought i had managed to modify the recursive algorithm to suit but unfortunately I think I have come unstuck.
Any generalized tips would be appreciated when implementing threads that utilise checking flags to determine when the thread is finished processing.
Kind Regards,
Chris Gibbs

Honestly, I think that recursion (as you stated) would be the easiest way to have solved this problem. But as you stated, threads must be used to solve this problem as a requirement of the project...
You could easily launch a Thread each time instead of calling your recursive method... that could possibly result in a crap load of threads, but the idea would work.
Definitely take a look at the SwingWorker class here if you're able to use J2SE 6: [http://java.sun.com/javase/6/docs/api/javax/swing/SwingWorker.html|http://java.sun.com/javase/6/docs/api/javax/swing/SwingWorker.html]
I currently use it while gathering data from several websites at the same time. What I did was create and execute() X number of MySwingWorker objects to collect the data, while they are not complete (i.e. MySwingWorker.isDone() is false) I just Thread.sleep(...).
Give it a try. It may suit your needs.

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My problem is described in the title. I have made a test by enabling the following unit:
[Unit]
Description=/etc/rc.local Compatibility
[Service]
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Last edited by olive (2015-03-16 16:49:34)

olive, now you're making even less sense. I didn't say the sleep example was stupid and I didn't question your reasons for doing/wanting this.
I suggested you add "Before=display-manager.service" and you respond "I added Before=graphical.target and it didn't change anything."
I also tried to explain why systemd has no reason to delay the display-manager.service. You could have asked for further clarification, as berbae has now done. Let's try a longer explanation.
Service startup
Services can be started in different ways, as configured with Type=. This determines when a service is considered "started" (or when the service's start-up is considered finished). When a service reaches this state (some time after being started), units that are supposed to start After= this service will be started (and no sooner).
With simple systemd has no further information about the start-up process. It launches whatever you specify in ExecStart and this is the main process that continues to run till the service stops. systemd assumes this type of service is started immediately. All the other types have some way for the process to indicate to systemd (either directly or indirectly) when it has finished starting.
Actually oneshot is also a bit special and that is where RemainAfterExit comes in. For oneshot, systemd waits for the process to exit before it starts any follow-up units (and with multiple ExecStarts I assume it waits for all of them). So that automatically leads to the scheme in berbae's last post. However, with RemainAfterExit, the unit remains active even though the process has exited, so this makes it look more like "normal" service with
begin of unit/startup ---- end of startup ------ end of unit
This is the relevant behavior for this thread. First sleep starts, then after 1000 seconds, start-up finishes and follow-up units will be started. Then either the unit dies, or (with RemainAfterExit) it stays "active".
The man page describes how "end of startup" is determined for each Type.
Targets
Targets are meant to group units together, to provide synchronization points (and replace runlevels). When you start a target, all its units will be started (in parallel if possible). The man page says:
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Requires=, RequiresOverridable= with dependencies of type After= if the
units in question also have DefaultDependencies=true.
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Back to olive
graphical.target has these DefaultDependencies, so it is not started until all its units (like display-manager.service) and other After= dependencies (like multi-user.target) have finished starting. Your sleep service has to be started before multi-user.target starts (again due to default target dependencies). So first display-manager and the sleep service are started and after 1000 seconds, the sleep service finishes starting and then (assuming all other dependencies were quicker) multi-user.target is started and graphical.target as well (assuming display-manager didn't need 1000 seconds).
If you want display-manager.service after the sleep service, add a Before/After line to specify that (this was your original goal and my suggestion).
olive wrote wrote:However, units that are parts of the graphical target are still launched before the graphical target become active. I am still unable to completely delay the starts of the graphical target before a specific unit completes.
It should be clear now how this works. "units that are part of the graphical target" can only mean "units that are wanted/required by the graphical target" but that is basically all the units that are started when you boot your system, because multi-user.target is a part of graphical.target. And your sleep service is a part of multi-user.target, so in fact you're saying you want to delay starting the sleep service until the sleep service completes
What you probably intended was to delay all units that are a part of graphical.target but not of multi-user.target until after the sleep service. I can't think of an easy (or even good) way to do this and this post is already too long, so I'll table that for now.

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network: Connecting http://localhost:8000/reportes/winls/resource/resource.class with cookie "JSESSIONID=573b1fbfcd200059b8bbbfa92b95"
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network: Connecting http://localhost:8000/reportes/winls/resource/resource_en.class with proxy=DIRECT
network: Connecting http://localhost:8000/reportes/winls/resource/resource_en.class with cookie "JSESSIONID=573b1fbfcd200059b8bbbfa92b95"
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network: Connecting http://localhost:8000/reportes/winls/resource/resource_en.properties with proxy=DIRECT
network: Connecting http://localhost:8000/reportes/winls/resource/resource_en.properties with cookie "JSESSIONID=573b1fbfcd200059b8bbbfa92b95"
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network: Connecting http://localhost:8000/reportes/winls/resource/resource_en_US.class with proxy=DIRECT
network: Connecting http://localhost:8000/reportes/winls/resource/resource_en_US.class with cookie "JSESSIONID=573b1fbfcd200059b8bbbfa92b95"
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LISTEN companyPostDate
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java.lang.NullPointerException
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network: Connecting http://localhost:8000/reportes/org/postgresql/errors_en_US.class with cookie "JSESSIONID=573b1fbfcd200059b8bbbfa92b95"
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Your applet appears to be asking for https:// protocol security.
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Dependent the server configuration you may or may not require the port number on the end of the domain
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Edited by: nicephotog on Oct 28, 2008 4:09 AM

Item Category TAB is not looking for Special Stock.

Hello,
We have an issue while using item category TAB. For sales orders having item category TAB is allowing to create the Delivery note even though there is no stock received (GOODS RECEIPT) and assigned against this sales order stock.
Ideally the system should not allow to create the Delivery note. However it is allowing to create the Delivery note.
Checked the correspoding Schedule line that was determined : CB.
CB in VOV6 the correct settins were made as below.
The checks for
Sched.line cat.        CB    Indiv.Purchase Order
Movement Type         601   GD goods issue:delvy
Order Type                NB    Purchase requisition
Item Category             0     Standard
Acct Assgt Cat.         M     Ind. cust. w/o KD-CO
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Here we have the purchase requistion number on the schedule line tab, and in VBAP could see the it as a special stock item with the indicator E.
Ideally the flow is ONLY when the GOODS RECEIPT has done against this sales order stock, then the system should allow to create the deilvery.
Checked the copy control settings in VTLA and for TAB the Data transfer routine is 101.
Please help to understand why the system allows to create delivery when there is no GR made against this.
Thanks in advance.
Ram.

Hi Navaneeth,
Thanks for your response.
What i need is the SYSTEM SHOULD NOT allow me to create the Delivery. In this case it is allowing me to create the Delivery.
VOV7-TAB-> Special stock indicator is set as 'E'.
Inspite of it is set as E the system is allowing and ONLY at the time of PGI it is looking for special stock and pops up with the error message:
Sales order stock 6941 000010 does not exist
Message no. M7184
I expect the system should not allow to create the delivery at first chance.
Please help if it requires any other settings?
Best Regards,
Ram

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Hi,
I don't think I can offer a solution, but I do have a similar problem with my router (supplied with my Sky broadband set-up). It's a Netgear router with 4 outputs. Until a few minutes ago, it was lying on my desk horizontally, but after attaching 2 plastic legs, it now stands vertically. I'm hoping this solves the overheating, as it is left switched on constantly (which probably contributes to the fact that I too have to 're-boot' it from time to time when I lose my Broadband connection).
Hope this helps.

New iTunes search help!: I'd like to just start typing in the upper right search and have the list update like it did in older iTunes versions. Now it has little suggestions of WHAT IM NOT LOOKING FOR!

Remember the days when you were looking for that metallica song... you kind of knew the name... so you start typing it in the search, and that BIG WELL of music would whittle down with every character typed? the search covered titles, artists, genres, ANYTHING that was displaying. I know a lot of folks HATED this dynamic, but let's face it, it worked, and it worked WELL. And Apple's had us all get used to that dynamic for over a DECADE.
I get that times need to move foreward, but they went WAYYYYYYY too far with how the simple search box works now(upper right one) ... The columns of Title, Album, Artist, are still there, but they drastically change the layout and presentation with everything you search for... and newsflash, NOT EVERY SONG BELONGS TO A GENRE OR ALBUM OR ARTIST....
I'm the kind of guy that doesnt allow itunes to attempt to copy eveything into hundreds of folders. I already have it all pretty well organized...Lots of my music are soundbytes that I just had in the main widow of iTunes. Sure they'd be buried in the thousands of other songs, but with a click of a key I could get to it... now iTunes ONLY seems to try searching things that are in albums, genres, labeled so specifically that I would have to take a month off JUST to start catalogging my music the way iTunes wants... Even THEN only showing me a small number of choices in the search bar .... like "Do you want these 4 songs you DIDNT search in the invisible queue next?" "Did you mean all this other sh*t that you DIDNT search for?" **** I used to be able to find almost ANY song with like 3 keystrokes. if I type in "Zelda" ... (looking for that obscure live Zelda acoustic I recorded with my phone that I dont have the band name to) It suggests EVERYTHING else BUT that song... whereas before it would just list the 20 or so ANYTHINGS I have loaded into itunes with that string of letters in it.
Anyone else seem to have this issue? Is the OLD easy to search buried in the furthest preference trenches to TRY to weed out old dogs such as myself, who were able to master the crappy UI iTunes has neglected to give a **** about in the past?

Please try the action I supplied in my post.
If you untick the search Entire library
Then type in your search term it will give the list of songs in the main window

Looking for a bluetooth headphone for my Macbook Air and Ipad Mini, I am not looking for a headphone that needs a transmitter to be connected to the source rather a headphone that can be connected directly via bluetooth to the source device

I am desperately looking for a bluetooth headphone that would be compatible to my Macbook air and Ipad mini both. I am more of looking for a headphone that does not need a transmitter device to be connected to the source (in this case Macbook Air and Ipad Mini) and headphone acting as a receiver, rather need a headphone that would be connected directly via bluetooth to the source, it would be great if multiple apple devices be connected simultaneously. Please suggest some good headphones.

Hey sorry for the late reply, I was busy to figure out alternatives as harman kardon was a difficult affair to find and acquire, but the good news is I managed to get hold of alternative.
Sony I assume recently launched a Bluetooth headphone DR-BTN200 which is compatible to my MacBook Air , iPad mini and android phone galaxy s2 with ease, the sound quality is pretty good as compared to other brands of Bluetooth headphones I checked compatible or incompatible to apple devices alike, this is definitely what I was looking for, costed me 7990 INR, this is highly recommended for ppl who are confused, I carried my devices to the store and checked before I bought a pair and pretty much happy,
The best part of this is its battery backup, I have used this hours for 3-5 days but this has not drain even then, but I do keep this charging once in 2-3 days just to keep this ready otherwise it does not even ask for it neither the quality of sound drops after 2-3 days of use.
This is over the ear headphone which is very soft but it's get sweaty around the ear I guess that's bound to happen.
Do get back to me for any other details, would be glad to share with all :)

Security questions not changing for purchases to verify iPad when I changed them online already?

I forgot my previous security questions and answers so I changed them so I could make purchases with my new iPad 1. However, whenever I purchase something it asks me to answer my security questions but they are still the old ones I do not remember the answers for... What do I do?

Alternatives for Help Resetting Security Questions and/or Rescue Mail
     1. If you have a valid rescue email address, then use this procedure:
         Rescue email address and how to reset Apple ID security questions.
     2. Fill out and submit this form. Select the topic, Account Security. You must
         have a Rescue Email to use this option.
     3. This is the only option if you do not already have a valid Rescue Email.
         These are telephone numbers for contacting Apple Support in your country.
         Apple ID- Contacting Apple for help with Apple ID account security. Select
         the appropriate country and call. Ask to speak to the Account Security Team.
Note: If you have already forgotten your security questions, then you cannot
         set up a rescue email address in order to reset them. You must set up
         the rescue email address beforehand.
Your Apple ID: Manage My Apple ID.
                         Apple ID- All about Apple ID security questions.

Threaded Sudoku solver - Assignment question (NOT LOOKING FOR ANSWERS )

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