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Reply to Asynchronous Design Patterns with Blocks GCD
Sorry I can't point you to any sample code off the top of my head, but this sounds like a perfect application of NSOperationQueue and operation dependencies. You could add an operation for each download. You can set the max concurrent operations to limit the number of concurrent requests but still have parallelism. You could add your processing operation with an operation dependency on each of the download operations so it wouldn't start until all the downloads were completed.Posting sample code to show multi threading synchronization is fraught with peril anyway since every situation is different. But in general, if you are accessing a common data structure from multiple threads, you add a synchronization primitive around each and every access to that data structure (read or write), and try and ensure that you don't deadlock. Don't hold the lock while you're doing a long network operation, for example - do the network operation, then lock / update / unlock. I use Obj-C so I've been doing it
Topic: App & System Services SubTopic: Core OS Tags:
Jun ’15
Reply to Can you upgrade from a 10.10.4 beta?
You can. I did and the update process did work fine for me after the invitation code being unlocked for the German AppStore.But I found, 10.11 has way more bugs than 10.10.4 beta, so, for example, for me, Photos is not launching anymore and I got a problem with iCloud mail in Mail while all other accounts I got in there continue to work fine.
Topic: App & System Services SubTopic: Core OS Tags:
Jun ’15
MDM Signing Certificate - Renewed
We have MDM installed on hundreds of devices, the signing cert and MDM push cert expires Friday, they have been renewed but reading the MDM Docs, extract below, It states that we need to replace the MDM profile. Well since it's over the air, does that mean the users will need to go throught the enrolment process AGAIN?SSL Certificate TrustMDM only connects to servers that have valid SSL certificates. If your server's SSL certificate is rooted in your organization's root certificate, the device must trust the root certificate before MDM will connect to your server.You may include the root certificate and any intermediate certificates in the same profile that contains the MDM payload. Certificate payloads are installed before the MDM payload.Your MDM server should replace the profile that contains the MDM payload well before any of the certificates in that profile expire. Remember: if any certificate in the SSL trust chain expires, the device cannot connect to the server to receive its commands. When t
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5.1k
Jun ’15
Dev Account & Dev Support Problems?
I'm unable to log into my dev account, and I get an error message saying There may be a problem with your account. Please contact us.... But it seems all dev support links to contact Apple (such as Request assistance with sign in issues) aren't working... Is anyone else having this problem too?
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Jun ’15
Filesystem Lab notes
Question: On Yosemite, there is an issue where FileVault 2 will report Encrypted Paused during the encryption process, then never resume. It won't decrypt, and the only fix seemed to be deleting the CoreStorage volume.Is there a fix for this besides deleting the CoreStorage volume? For example, how to unpause and either resume encryption or decrypt?Answer:The Encryption Paused issue was addressed in 10.10.3. The root cause was a problem with resizing the CoreStorage volume. When the CoreStorage volume was unable to grow, the encryption was paused and could not resume until the resize issue was addressed.To fix this issue:1. Update your Mac to 10.10.3, or boot from an alternate drive which is running 10.10.3.2. Un-lock the encrypted drive if necessary3. Open Terminal4. Run the following command to get your Mac's disk identifier:diskutil list5. Once you have the disk identifier information, run the following command:sudo fsck_cs -y disk_identifier_goes_here6. fsck_cs should repair the CoreStor
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2.1k
Jun ’15
iBooks won't login to iCloud
When i open iBooks, it show me a windows to login with my icloud ID. When i press enter, the windows disappears and become gray, with the name window and a spinning wheel (not when it crash, but when it's thinking/connecting). Then it comes back with the same login screen and the text An unknow error occured. When i close this window, iBooks hang and i have to force close the program.Console info:09-06-15 19:32:01,755 storeaccountd[567]: ADI: { Connection = keep-alive; Content-Length = 20; Content-Type = application/x-dmap-tagged; Date = Tue, 09 Jun 2015 17:31:59 GMT; Strict-Transport-Security = max-age=31536000; apple-timing-app = 5 ms; server-cloud-daap-version = 1.0; x-apple-application-instance = 404602; x-apple-application-site = ST11; x-apple-jingle-correlation-key = P6GIJJU424NU6YWNKOWSGTFHTI; x-webobjects-loadaverage = 0;}09-06-15 19:32:01,000 kernel[0]: Sandbox: iBooks(1543) deny(1) mach-lookup com.apple.dock.appstore09-06-15 19:32:01,763 iBooks[1543]: Could not find image named 'NSImage'.09-06-15 19
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Jun ’15
Can't enroll in developer program
Today, the day after the new developer program was released by apple, I was trying to enroll, but after going through the review page, it said unable to precess your request. I'm not sure what to do since it was an unknown error and I need to enroll in the new program since my previous membership expired. Any help is appreciated, thank you.
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570
Jun ’15
SIM Required for Setup?
I'm unable to get through setup/activatation due to not having a SIM card installed. I'm using my old iPhone 5 and I don't have a SIM for it. In years past I was sure you were able to set up a device without a SIM. My device is provisioned and registered .Does anyone have tips for getting around this issue?
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Jun ’15
Reply to Mail and multiple exchange accounts
I have now also discovered that I am unable to send emails from my exchange/office 365 account. This is not a very good email client in its current form and will not be at all useful to anyone in the Enterprise (who will all use exchange/office 365).I suppose on the bright side it will free up a load of network bandwidth for Apple Music...
Topic: App & System Services SubTopic: Core OS Tags:
Jun ’15