RE: question for sending multiple requests to iTunes
RE: question for sending multiple requests to iTunes
- Subject: RE: question for sending multiple requests to iTunes
- From: "Philip Lukidis" <email@hidden>
- Date: Mon, 4 Sep 2006 13:00:22 -0400
- Thread-topic: question for sending multiple requests to iTunes
Title: RE: question for sending multiple requests to iTunes
Hello, thanks for your reply. I'm away from work for now, but I had also sent the request to the cocoa list, where someone was kind enouhg to reveal my error. I'm quite embarassed to admit that I missed the admonition in Apple's documentation to not use NSAppleScript objects in any thread but the main thread. That is something which I have quite clearly violated. When I get back to work tomorrow I shall test it out.
Your finding is interesting also, and I will read it as well.
thank you,
Philip Lukidis
-----Original Message-----
From: Le Stang Jean-Baptiste [mailto:email@hidden]
Sent: Sat 9/2/2006 4:05 AM
To: Philip Lukidis; Applescript Users
Subject: Re: question for sending multiple requests to iTunes
Maybe you are encountering the following issue described in this
document :
<http://developer.apple.com/documentation/mac/pdf/
Interapplication_Communication/Scripting_Components.pdf#search=%
22COmponent INstance MultiThreading AppleScript">
"Your application may maintain several connections to a single
component, or it may have connections to several components at the
same time. Because some scripting components (including the current
version of AppleScript) can execute only one script at a time per
component instance, a multithreaded application must provide a
separate component instance for each script that it compiles or
executes while it is simultaneously executing other scripts."
--
Jean-Baptiste LE STANG
On Sep 1, 2006, at 11:39 PM, Philip Lukidis wrote:
> Hello. I'm not if the problem which I'm am experiencing is a cocoa
> issue or an Applescript issue. Briefly, my application accesses
> iTunes via AppleScript, specifically by using cocoa NSAppleScript
> objects. Each script file is associated with its own NSAppleScript
> object, and access to it is protected with a pthread_mutex, so it's
> quite impossible for 2 threads to call the same script
> simultaneously. However, I'm finding that unless I synchronize
> access to these script objects globally in my process (i.e. one
> mutex for all calls), parallel calls to different scripts produce a
> resounding crash.
>
> Now, I could understand why there would be a crash if two threads
> tried to access the same script object in parallel, but I cannot
> understand why there would be a problem with two threads accessing
> different scripts simultaneously.
>
> Can anyone explain why this would be a problem?
>
> thanks,
>
> Philip Lukidis
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