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Re: How to know, which NSThread has terminated?

From: Philip Mötteli
Subject: Re: How to know, which NSThread has terminated?
Date: Sat, 29 May 2004 11:43:06 +0200

Am 29.05.2004 um 10:26 schrieb Shaun Wexler:
On May 29, 2004, at 12:18 AM, Philip Mötteli wrote:

I have no idea how to recognize this just created thread later, when it terminates. What I need is something like a handle. I mean objc_thread_detach() gives back an objc_thread_t too. I could put some flag into the tread dictionary, but it would be so much nicer to be able to just ask the thread for its handle or to keep the address of the NSThread instance.

Here's an idea: Send a notification to the main thread using -performSelectorOnMainThread: with the NSThread object (using NSThread's +currentThread class method to obtain an address) as the notification's embedded object. I don't see why that wouldn't work,

Good idea, but I create a lot of threads from different objects. How can I be sure, that not in the same moment (or slightly before or afterwards) another thread is forking a thread, so sending this notification? Or, as far as I know, performInMainThread would be executed, when the main thread enters the next time the runloop. So I could have forked several other threads, which' notifications would then be subsequently queued in the event queue.

Written in Mail.app:

extern NSMutableDictionary *managedThreads; // assume this exists

- (void)detachManagedThreadSelector:(SEL)selector toTarget:(id)target withObject:(id)identifier

- (void)managedThread:(id)invocation

That's what I actually already did. I pass a kind of a flag/identifier to a wrapper detach-method, using an NSInvocation as the action description. What I do though differently, is to keep the identifier in the thread dictionary. The moment I receive the exit notification, I should also receive the NSThread instance id and with that, I can evaluate the thread identifier stored in the thread dictionary. But it's all so unnecessarily complicated, that I thought, I must have missed something. Why doesn't NSThread' detach method just simply return the id of its instance?


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