site_archiver@lists.apple.com Delivered-To: darwin-dev@lists.apple.com Thread-index: AcZwfh5fEca789+oTz+r1u+MCYYykgACKNVg Thread-topic: question for CFRunLoopStop() Thanks for your help in this matter. Using this approach seems to work fine. Philip Lukidis -----Original Message----- From: Kevin Van Vechten [mailto:kevin@opendarwin.org] Sent: Friday, May 05, 2006 3:55 PM To: Philip Lukidis Cc: Darwin development list Subject: Re: question for CFRunLoopStop() The parent thread needs to retain the child's runloop to ensure it has a valid reference when the call to CFRunLoopStop is made. You'll need to do some synchronization around the hand-off of the runloop reference from child to parent to ensure correctness. If properly retained, the run loop reference should remain valid after the child thread exits. - Kevin On May 5, 2006, at 11:36 AM, Philip Lukidis wrote:
I forgot to mention the symptoms to my problem. The problem followed the scenario laid out in the case of the parent thread running down the child thread, which had a timer on its runloop. Sometimes the child "timer thread" had exited by the time the parent called CFRunLoopStop() was (so the parent was scribbling in random memory, as the runloop was deallocated). But I figured out the parent was provoking the child to exit by removing the timer from the runloop, so there was an actual race condition here.
Would it be better for the parent to remove the timer from the loop, or call CFRunLoopStop()?
thanks,
Philip Lukidis
-----Original Message----- From: darwin-dev-bounces+plukidis=guillemot.com@lists.apple.com [mailto:darwin-dev-bounces+plukidis=guillemot.com@lists.apple.com]On Behalf Of Philip Lukidis Sent: Friday, May 05, 2006 11:47 AM To: darwin-dev@lists.apple.com Subject: question for CFRunLoopStop()
Hello. I hope that I'm posting this to the correct list.
Concerning CF, I was wondering if the following scenario is correct: A "parent" thread creates a child thread via the pthread library. The child thread has only 1 runloop source on it (a timer in fact), and once the timer is applied onto the child runloop by the child itself, the child proceeds to call CFRunLoopRun() on itself. Now the parent is responsible for running down this child on demand. Can the parent rundown the child by: -invalidating the timer (via CFRunLoopTimerInvalidate()) -removing the timer (via CFRunLoopRemoveTimer()) -calling CFRunLoopIsWaiting() in a while loop until it returns true (which indicates that all callbacks have drained and that it is waiting again, but of course since the timer was invalidated it can never be called again). Of course I should NOT holding a resource which the callback might need in order to execute and exit. -calling CFRunLoopStop() -calling pthread_join() on the pthread
Can this also be extended to other runloop sources, by using CFRunLoopSourceInvalidate() instead of CFRunLoopTimerInvalidate(), and CFRunLoopRemoveSource() instead of CFRunLoopRemoveTimer()?
If these procedures are incorrect, why so, and what are the alternatives?
thanks,
Philip Lukidis _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/plukidis% 40guillemot.com
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