Is this threadsafe ?

I have this code, just with to know , is it thread safe ?
public class TestThreadSafe {
     private static final Object object = new Object();
     public static Object getInstance()
          return object;
}

sachin.tomar wrote:
Thanks for the information.
I read some where that some JVM's work like, they initialize the instance before all the fields are initialized and in this case it does not remain safe any more.What? I don't think getInstance will be called before the class is fully loaded and initialized. I'm not sure that I remember it correctly (it was a couple of years ago that I read an article about it), but I think you are talking about the problem where you are lazily initializing the attribute.

Similar Messages

Is this threadSAFE ??? plz help

25 threads keeps entering a method to check some stuff.. it is not synchronized...
This is just a similar example..
public checkme(Somestuff abc) {
long time1 = System.currentTimeMillis(); // timers around method to check how much time it takes
callmetoCheck(abc);
long recordTime = System.currentTimeMillis() - time1; // would this time be accurate even if multiple threads are trying to access it..
recordcheckingTime(recordTime);
i have a method to accumulate all values of time taken to process callmetoCkeck() method... How can this be thread safe when different threads enter this method. is variable time1 thread safe ??
public synchronized void recordcheckingTime(long time){
accumulator += time;
plz help guys...my last 4 months work is in jeopardy...
Thank you..
Edited by: javanewbie83 on Sep 23, 2008 8:47 PM

time1 is local to each thread so it doesn't need to be thread safe.

Pls clarify me about threadsafe and servlet data member

is this threadsafe if my servlet has data member but only initiated by init() and rest of the methods do read only on this data member.
e.g.
public class myServlet extends HttpServlet {
    private String someString;
    public void init() throws ServletException {
        // codes inti someString;
    // rest of methods
    // bleh ...
}one more question: is that someString is so called servlet instance variable?

Hi,
you r going through a wrong way. Try this way
TABLES: PA9180.
git_pa9180 TYPE STANDARD TABLE OF pa9180.
start-of-selection.
SELECT * FROM PA9180 INTO TABLE GIT_PA9180
WHERE ENDDA BETWEEN G_PRE_DATE AND SY-DATUM
AND ZZCASE_NO LIKE 'E%'.
END-OF-SELECTION.
NOW LOOP AT THIS INTERNAL TABLE(GIT_PA9180) AND PROCESS IT FOR FURTHER RESULTS
Hope this solves ur problem.
Regards,
Ibrar

ThreadSafeLazyLoading of a Singleton Object

Hi,
Do anyone know the mechanism and necessity of this ThreadSafe Lazy loading of a singleton object?
Thanks.

I know the mechanism (I believe Enum is the popular choice these days).
The necessity is dubious. Most people don't need lazy loading singletons, they just think it's a part of the Singleton pattern.

How to make the server threadsafe (Please Help)

Hi to all,
I have urgent question, and any
reply will be welcome.
How i make my server that use rmi threadsafe,
i want that each request from clients,the
server will make a separate thread.
the ejb use jndi to do this, how can i do this in rmi
i want that a client will get a reference to a factory
object in the server, the factory object will create a
thread and will return the reference to the client.
Thanks,
dan

Hi Bill,
Thanks for your reply.
at the rmi specification it said that :
3.2 Thread Usage in Remote Method Invocations
A method dispatched by the RMI runtime to a remote object implementation may or may not execute in a separate thread. The RMI runtime makes no guarantees with respect to mapping remote object invocations to threads. Since remote method invocation on the same remote object may execute concurrently, a remote object implementation needs to make sure its implementation is thread-safe.
this is all what sun has to say about using
threads with rmi.
do you have any example for using rmi server
that handle concurrent access?
again,
lots of thanks for your help.
dan

Urgent: need threadsafe replacement for malloc

Hi,
I have a native library that is using GetDirectBufferAddress to create large chunks
within the java memory model that I can use to subdivide and alloc from
in the native code instead of using malloc. However, there are multiple threads
using these chunks so I need a locking mechanism.
The problem is that MonitorEntry/MonitorExit takes 250 nanoseconds, which is
a huge price to pay for allocation and free, total = 500. My question is can I
do whatever malloc does in the GNU library to make itself immune to jvm
thread context switches, especially on multiple cpu machines. Spin locks,
openmp mutexes? Does anyone know how malloc is made threadsafe to
be ok to use within a JNI library? And how I can get my hands on the
necessary code.
Thanks,
Andy

Greetings Folks,
Like the original poster I am trying to back up my HD info. Got the exact same error message and code:
"The operation cannot be completed because one or
more required items cannot be found.
(Error code -43).
Could not open the data fork of "<unable to get file path>" (-43)."
I was able to trace the error code down on Apple's Support site under the heading: Mac OS X, Mac OS X Server: "Error -43" When Using Windows File Sharing (SMB). Yay...except I have never used Windows file sharing and can't figure how this pertains to my problem.
I did type
in the "<unable to get file path>" into spotlight and
got several hits:
Documents:
core.html.html
windows.html.html
ssl_faq.html
PDF Documents:
About Xcode Tools.pdf
I deleted the "Documents" files (same ones as OP) that came up when I searched <unable to get file path> Was this an oops?
Anyway, the disc was only 50% complete. I got a
"closing session 1" window and that stayed active on
the desktop for a few minutes and then the dvd just
spit out. I put the dvd back in to see what was on it
and didn't even open for a minute or two, just heard
some clicking sounds from the drive and never got a
disc icon on the desktop to even look at what was on
the dvd. I gave it another try but sam thing
happened.
Same thing happened here. I would really like to back up my files. I have already trashed several DVDs in my unsuccessful attempts.
I don't see any replies to the OP--is there anyone with a few cogent thoughts on all this out there? The same thing has now happened to at least 2 Mac users, which makes it seem a lot less like it's all in my head.
Thank you many times over.
iMac G5 2GHz PPC Mac OS X (10.4.7) still miss my Indigo G3

PowerBuilder Classdefinition not threadsafe?

Hi,
I have an object that uses the Classdefinition variable to access the variablelist.
This functionality runs fine in single task environment (if I simple CREATE the object). But if I run it in a separate task (as SharedObject) the results are sometimes unexpected. For instance I sometimes get empty variable names or the function call or the whole application hangs.
May it be, that the access of Classdefinition is not threadsafe?
I have tested it with a simple test application (no PFC or others).

Additional information:
To avoid the problem I now use a mutex to serialize the access. It works almost good!
But now Powerbuilder crashes only sometimes at access of variablelist property:
Microsoft Visual C++ Runtime Library
Runtime Error!
Program: C:\Program Files (x86)\Sybase\PowerBuilder 12.0\PB120.EXE
R6025
- pure virtual function call
Any ideas what's the reason?

CheckThread static analysis tool, @ThreadSafe, @ThreadConfined

Hello,
I'm looking for feedback on CheckThread, a free and open source static analysis tool I created.
By using a @ThreadConfined and @ThreadSafe annotation on methods and classes, this tool can catch certain types of threading bugs at compile time.
To see examples, check out:
http://www.checkthread.org/examples.html
For example, when developing a Java Swing app, a Java developer must ensure that the Swing component is accessed only on the Event-Dispatch Thread after the component is realized. With large applications that are thousands of lines of code, simple thread confinement for Swing can be difficult to enforce and may result in wacky sporadic runtime behavior. CheckThread solves this problem using annotations and a static analysis Ant task - thread confinement problems are caught at compile time. An added benefit is that the threading model of Java code is well documented inline with the code.
All feedback welcome!
Thanks,
Joe

I recommend you to ask developers of FindBugs to add your feature to their project. FindBugs says that it already supports concurrency bugs finding (see jcip package), but that support is very poor (actually, it's not working). I'll try your program.

XMLNode.selectNodes() threadsafe?

Running a multi-threaded application that hits the XMLNode.selectNodes()
right at the same time doing a node.selectNodes("*") throws null pointer exceptions.
This does not happen in a single threaded mode. (See exception below). Also,
the same program produces inconsistent results running in a threaded mode using
the selectNodes extensively. It seems that the code is not threadsafe. I know that
the inputs to the call are not null, something in the xml parser code is having a problem.
java.lang.NullPointerException
at oracle.xml.parser.v2.XPathStep.getSelectedNodes(XPathStep.java:383)
at oracle.xml.parser.v2.PathExpr.getSelectedNodes(XSLNodeSetExpr.java:549)
at oracle.xml.parser.v2.XMLNode.selectNodes(XMLNode.java:694)
at oracle.xml.parser.v2.XMLNode.selectNodes(XMLNode.java:665)
at oracle.xml.parser.v2.XMLNode.selectNodes(XMLNode.java:723)
at org.oclc.util.xml.oracle.XPathUtil.selectNodes(XPathUtil.java:49)
at org.oclc.util.xml.XSLUtil.selectNodes(XSLUtil.java(Compiled Code))
at org.oclc.xwc.data.recordloader.AbstractOracleRecordLoader.generateTerms(AbstractOracleRecordLoader.java(Compiled Code))
at org.oclc.xwc.data.recordloader.LoadMDATA.loadRe[i]Long postings are being truncated to ~1 kB at this time.

Do you have any thread updating the DOM at the same time?

IFmsAuthServerContext threadsafeness?

I'm working on a authorize plugin for FMIS, and i'm wondering
if I need to be worried about threads etc when calling
IFmsAuthServerContext's onAuthorize/onNotify from other threads
inside my plugin (ie a thread pool, like the File plugin
example)?

No - it is not even slightly Thread safe. Completely
unsafe, in fact. You don't synchronize
anywhere.Hashtable has synchronisation.
>
The point behind something being Threadsafe is that as
one thread has finished executing one line, and before
it is executing the next, another Thread may have
changed the state of your object. eg.
if (dyn == null) {
//oh-no, another Thread has just loaded the dyn
n variable, if I read dyn now it wouldn't be nullI don't get this. The dyn is a local variable. Every thread has it's own dyn.
dynamicCache.put(intID, Boolean.FALSE);
//even worse, I've just over-written it, and now the
e other Thread is mysteriously getting back FALSEI assume that hashtable still has synchronization.
dyn.loadDynamicByID(id);
dynamicCache.put(intID, dyn);
//oh no, another Thread has just overwritten this
s because it isn't Thread-safe.
Don't mess aroundI'm not.
synchronized (dynamicCache) {
Dynamic dyn = dynamicCache.get(intID);
if (dyn == null)
dynamicCache.put(intID, loadDynamicByID(id));
}Don't try simple Double-checked-locking (DCL doesn't
work in the current Java memory model - see
http://www.javaworld.com) and Thread-local DCL is at
the moment still slower than full synchronization.The idea was to allow multible record loads at the time, but reach specially if the same record is loaded same time. The harddisk access is synchronized with Object hdAccess=new Object.
I might be wrong, but I still think that my code is threadsafe. Sorry for asking help and then arguing, but i do. Point to me that i'm wrong...

Is "Easy I/O for daq" library threadsafe ?

In my multithreaded application, a thread realizes data acquisition and another switches relays, on a multifunction daq board.
Is "Easy I/O for daq" library threadsafe ?

Hello Hopeula,
The library "Easy I/O for daq" uses the DLL NI-DAQ which is threadsafe.
Please see the link below for more information :
http://digital.ni.com/public.nsf/websearch/E1C8492854855FA98625689E0072E832?OpenDocument
I hope this help.
Regards,
Sanaa TAZI
National Instruments France
Sanaa T.
National Instruments France
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>> http://www.nidays.fr/images/081110_ban_nidays09_468X60.gif

Can I put more than one user under one Apple ID account. I want to let other family members use imessage on their own Apple device. Or is there another way to get this end result?

Can I put more than one user under one Apple ID account. I want to let other family members use imessage on their own Apple device. Or is there another way to get this end result?

You can seach the net for solutions like this one http://appletvvpn.com/how-to-connect-apple-tv-2-to-vpn/ another idea is to use a PC as the control and fit that with a wireless card and set up a ad hoc wireless network that the Apple TV uses.

HT204053 I have multiple family members using one apple id account and all of each others information is going onto each others phones/how do i stop this?

I have multiple family members using one apple id and all of our data is going onto each others phones/how do i stop this?

Each person needs to have their own separate Apple ID along with their own separate computer user account and iTunes Library.

Error Level 10: I have this error where a plugin broke that I had to remove because it was not finding it. How do i install it back so it functions?

8/29/2014 7:15am
It seems to me that if Microsoft's platform can not fix it with the troubleshooter that the troubleshooter sucks. It does not know when errors are thrown so your developer sucks on creating software for errors that are popping up in your software?
if a error is thrown in Windows 8 it should catch it upon a thrown error in programming? This hsould be a level 1 ticket. Since when I call you support for error in your product no one wants to address problems in your software and get mea tech to resolve
it?
The question now is how do I fix this and why is it causing me an internal error 500 for my web server install?
I may have other issues but I need access to my web server through my browser I used fsocketopen to troubleshoot it?
It gets back a internal 500 on Gecko process in firefox and on IE it just won't serve out the document in my web server abyss or apache? So the question is what service is broken so I can't serve my [web server] pages out? Let me go through all the event
logs that I have with errors below?
Under Applications:
1) Failure to load the application settings for package microsoft.windowscommunicationsapps_8wekyb3d8bbwe. Error Code: 10
2) LMS Service cannot connect to Intel(R) MEI driver. Error level 1
3) Failure to load the application settings for package microsoft.windowscommunicationsapps_8wekyb3d8bbwe. Error Code: 3
4) SearchIndexer (3476) Windows: The database engine attached a database (1, C:\ProgramData\Microsoft\Search\Data\Applications\Windows\Windows.edb). (Time=0 seconds)
5) Internal Timing Sequence: [1] 0.000, [2] 0.000, [3] 0.125, [4] 0.000, [5] 0.000, [6] 0.000, [7] 0.000, [8] 0.000, [9] 0.000, [10] 0.000, [11] 0.000, [12] 0.000.
Saved Cache: 1 0: Evenet Id level 326.
6) SearchIndexer (3476) Windows: The database engine started a new instance (0). (Time=0 seconds)
7) Internal Timing Sequence: [1] 0.000, [2] 0.000, [3] 0.000, [4] 0.000, [5] 0.000, [6] 0.000, [7] 0.000, [8] 0.000, [9] 0.000, [10] 0.000. eveent level 105
8) SearchIndexer (3476) Windows: The database engine (6.03.9600.0000) is starting a new instance (0). Error Level 102
Under Security:
1) We might want to check this out here User Account Management changed?
Under Setup: no errors.
Under System below:
1) Name resolution for the name win8.ipv6.microsoft.com. timed out after none of the configured DNS servers responded.Event level 1014
2) Intel(R) 82567LM-3 Gigabit Network Connection
Network link is disconnected.
3) The system has returned from a low power state.
Sleep Time: ‎2014‎-‎08‎-‎29T05:10:07.602701000Z
Wake Time: ‎2014‎-‎08‎-‎29T13:13:47.945773100Z
Wake Source: Device -USB Root Hub : Error level 1
4) The browser has forced an election on network \Device\NetBT_Tcpip_{58565081-3013-43B6-AE07-CC89C71F6036} because a master browser was stopped. Event Id 8033.
5) The driver \Driver\WudfRd failed to load for the device SWD\WPDBUSENUM\_??_USBSTOR#Disk&Ven_EPSON&Prod_Storage&Rev_1.00#7&2d369789&0&533536503532383375&0#{53f56307-b6bf-11d0-94f2-00a0c91efb8b}. Event error 219.
6) The driver \Driver\WudfRd failed to load for the device SWD\WPDBUSENUM\{3c83e4cf-28e9-11e4-827b-b8ac6f8aec21}#0000000000004000. Error Level Id 219.
7) The UMDF reflector was unable to complete startup because the WUDFPf service was not found. This service may be started later during boot, at which point Windows will attempt to start the device again. Error Id 10114.
8) Unable to bind to the underlying transport for [::]:80. The IP Listen-Only list may contain a reference to an interface which may not exist on this machine. The data field contains the error number. Event Id 15005.
9) The supersafer64 service failed to start due to the following error:
The system cannot find the file specified. Event ID 7000.
10) The SNMP Service encountered an error while accessing the registry key SYSTEM\CurrentControlSet\Services\SNMP\Parameters\TrapConfiguration. Error: 1500.
11) The SAS Core Service service failed to start due to the following error:
The system cannot find the file specified. 7000
12 The World Wide Web Publishing Service (WWW Service) did not register the URL prefix http://*:80/ for site 1. The site has been disabled. The data field contains the error number. 1004
13) The driver \Driver\WudfRd failed to load for the device SWD\WPDBUSENUM\_??_USBSTOR#Disk&Ven_EPSON&Prod_Storage&Rev_1.00#7&2d369789&0&533536503532383375&0#{53f56307-b6bf-11d0-94f2-00a0c91efb8b}. Error level 219
14) Name resolution for the name win8.ipv6.microsoft.com. timed out after none of the configured DNS servers responded. Error level 1014.
Now I need help with all these error since Windows 8 with maybe 15 applications is failing after no setup errors? What would cause these we need to find out? Since I can not use your product with so many developer errors? and to put out a products that doesn
work is pointless? So please call me and have some help me through the errors and tell your support to stop ignoring the errors that broke the products?
Sincerely, William Dunlap {removed} N. Academy blvd, 201, Colorado Springs, CO 80910 http:\\interfacesone.fnhost.org
{removed}. I need a tech to help me get my web server up?

So now you don't release the security breaches in windows 8. You mean to tell me that you can use Powershell - Using WMI to breach security in VB apps on the web by getting my file structures?
What is this all about?
1 Set VPN NIC Settings
    2 Get Network Data from servers
Set VPN NIC Settings
$error.clear | out-null
cls
$ErrorActionPreference = "SilentlyContinue"
if ( $Args.Count -ne 1 ) { "
Not enough arguments
Usage :
   script.ps1 server
"; exit }
$server = $Args[0].ToLower()
"We are working with $server"
$netAdapt = get-wmiobject -class Win32_NetworkAdapter -computer $server
if (!($netAdapt)) {
   "Failed to connect to the target server!"
   exit(5)
foreach ($card in $netAdapt) {
   IF (!([string]::IsNullOrEmpty($card.NetConnectionID))) {
       if ($card.NetConnectionID.CompareTo("VPN Virtual NIC") -eq 0) {
           $myID = $card.DeviceID
$NAC = [wmi]"\\$server\root\cimv2:Win32_NetworkAdapterConfiguration.index='$myid'"
$guid=$NAC.settingID
"Setting DNS Toggles"
$dnsToggle = $NAC.SetDynamicDNSRegistration(0,0)
if ($dnsToggle) {
       "Success"
   } else {
       "Failure"
$strShowNicKeyName = "SYSTEM\CurrentControlSet\Control\Network\{4D36E972-E325-11CE-BFC1-08002BE10318}\$guid\connection"
#$strShowNicKeyName
$reg = [Microsoft.Win32.RegistryKey]::OpenRemoteBaseKey('LocalMachine', $server)
$regKey= $reg.OpenSubKey("$strShowNicKeyName",$true)
$showIcon = $regKey.GetValue("ShowIcon")
if (!($showIcon -eq 1)) {
   "The icon is hidden.. Setting it now"
   $setIcon = $regKey.SetValue('ShowIcon',1,'DWORD')
   } else {
   "The icon is visible already."
"Script Ends"
Get Network Data from servers
$myfile = get-content servers.txt
echo "Server   IPs   Subnet   GW" | out-file "Results.txt" -Append
foreach ($server in $myfile) {
   Write-Host "Looking at $server"
   $colitems = Get-WmiObject win32_NetworkAdapterConfiguration -computer "$server" -Filter 'IPEnabled = "True"' | select ipaddress,ipsubnet,index,defaultipgateway
   foreach($objItem in $colItems) {
   Write-Host ""
   $myip = $objItem.IPAddress -join " "
   $mySubnet = $objItem.IPSubnet
   $myGW = $objItem.DefaultIPGateway
   $temp = $objItem.index
   $myid = Get-WmiObject win32_NetworkAdapter -computer "$server" -Filter "index = $temp" | select netconnectionid
   $myid = $myid -replace "@{netconnectionid=",""
   $myid = $myid -Replace "}",""
   echo "$server   $myip   $mySubnet   $myGW   $myid"
   echo "$server   $myip   $mySubnet   $myGW   $myid" | out-file "Results.txt" -Append
Is this possible on any machine with power shell and if so how is access done?
William Dunlap

I will give $100 to the person who can solve this problem once and for all.

I'm not even kidding, dude. We can do PayPay, I'll mail you a check, whatever you want. That is how frustrating this is, that is how badly I want it fixed, and that is how much overtime I've worked lately thanks to being shorthanded at my place of biz-nass. I'm an hombre of my word, so if you actually come up with a solution that works, the cheddar will be yours. Okay let's hit it.
It's the skipping thing. First 10-12 seconds of a song - every song - will play fine, then iTunes skips, stutters, and basically does the god **** hokey pokey and shakes it all about. It happens most notably with songs that I double-click to play, but I'm pretty much noticing it on any song now after a transition is made. I've been using iTunes for ages and this didn't happen until the upgrade to 7.3. I have poured over these forums for nearly a week, tried every solution offered (even offered one of my own that actually worked for maybe four days before the whole thing started up again) and NOTHING. To save us all some time, here's what I've tried:
- Downgrading. I'll admit I didn't do this correctly at first. I didn't remove everything according to the support guidelines, but I went down to version 6.05 and that did nothing to quell the skipping. I upgraded back up to 7.3 because hey, why not, and attempted the remaining trial fixes. I have since removed both iTunes and Quicktime, step my step according the the guidelines, and not only have I downgraded to my current running version of 7.2, I put both of the programs on my F drive (as opposed to the default C drive), my gigantic bonus internal drive where I typically keep nothing but my giganto music library. I thought putting the app on the same drive as the music might fix things. I thought wrong. Dead wrong. Dead diddly dum iddly wrong.
- Quicktime settings. My settings for Quicktime have always been in safe mode with the output size at 16 bits. So when I saw this "fix" I just rolled my eyes. I used to have that dealio back in the dizzle when iTunes would just get all static-y and skip when I'd open other programs or even just minimize it, so that fix worked for that, but it's nothing compared to this. In simpler terms, that fix is like Superman, and this skipping? The kryptonite. Actually that's probably not a great metaphor, but we've got a ways to go and this is going to get mucho boring if I don't throw some chuckles out there. Ready for fix three? Giddy up!
- Turn off cross-fade? It's never been on. I never really got the appeal of that, and also I think it resulted in some minor skipping back in the d. I also attempted similar fixes like turning off the equalizer, messing with the volume, closing last.fm, REMOVING an old album art retrieval program from back before iTunes got its **** together with album art, ANYTHING that might interfere with playback was turned off, removed, b-slapped, and sent crying home to its moms. Nada.
- Recreating my library. This was the fix I offered someone else, because it actually did the trick for a few days. After an entire night spent reimporting 73 gigs worth of music, it played fine, but I did lose a ton of album art, playcounts, etc, so you can imagine how ****** I was when this wound up not being a permanent fix. I was beyond ******. I was livid. But I was taught in the dojos of my youth to channel my anger into productivity, and instead of sculpting a lovely bonsai tree, I set out to fix this pup once and for all.
- That darn anti-virus! This was the final fix I tried, even though I wasn't using any of the culprit programs listed in the forums as causes of the skipping, and even those offering this as a solution confessed it was pretty hit or miss. But having tried everything else, having resorted to playing my music on MediaMonkey of all things, I figured I'd give it a shot. I used (reason for the past-tense forthcoming) AVG Anti-Virus, Lavasoft AdAware and something called Spyware Doctor that I think just came bundled with XP. I removed all of them. I had just done a virus scan recently to see if that's what was causing this, so I figured I'd be okay until I could redownload them after this fix wound up not working. And it didn't work, so there's that.
There may be a couple of fixes I've tried that I'm forgetting now, since I'm delirious after spending practically every night for the past week trying to fix this problem, while my girlf, Heather, sits and laughs at me while watching Clark and Michael on her MacBook. In fact, she's laughing at the $100 offer as I type this, but I assure you, if you offer a solution that works, the money is as good as yours. If you come up with a workable solution, I'll have to test and make sure it isn't temporary like the recreating my library thing, but I won't leave you hanging once I'm satisfied that it's fixed for good. I know it's unorthodox, perhaps illegal in some states, but I'm desperate here, peeps. The ball is in your court, and I beg you not to give up the rock.
Gateway E-2000 Windows XP

I think the problem lays with Last.fm. I had the same exact problem as you. In your processes screen, end the task "lastfmhelper.exe" Last.fm still scrobbles. The tracks don't skip, although I notice there is still a bit of a lag in the first part of the song - but if you can deal with that, no skipping. I think you will have to end that task everytime you boot up your computer, or uninstall last.fm completely until they fix it; it is a bug in their software, as opposed to iTunes.

Is this threadsafe ?

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