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Re: pthread_cancel problem on MAC OSX

On Jan 12, 2004, at 1:39 PM, Timothy Standing wrote:
Yes, you're right: pthread_cancel() does nothing. The official word from Apple is that it will never work. You need to use another method to get your child threads to finish. Polling a global after a quanta of work in the child thread is one method.

Where is it stated that pthread_cancel() will never work? As a matter of fact, it does work today. It's just that most of the defined cancellation points are currently disabled. You have to add explicit calls to pthread_testcancel() to recognize a cancellation.

We do plan on addressing that issue (as far as I know, and I should know, as I have been involved in working on a solution on and off over the last year or so). The problem is all the other frameworks in Mac OS X. They are not pthread_cancel() safe [yet] - and we didn't want to enable all the defined cancellation points until we had a mechanism to make them work safely together. But we WILL be doing it at some point in the future (it's always just a matter of timing).

As for Girish's example, adding an explicit call to pthread_testcancel() in the sleep loop makes it work on Darwin (and would continue to work on other systems as well). But we understand that not all programs are as simple as that test case. ;-)
--Jim


Tim Standing
SoftRAID, LLC

On Jan 5, 2004, at 10:00 PM, email@hidden wrote:

Hi Darwin Devloper,

I am doing some assignments related to thread in user
space.After doing lots of R & D, I came to know that
"pthread_cancel()" is not working properly.The same
program is working fine on Linux.
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References: 
 >Re: pthread_cancel problem on MAC OSX (From: Timothy Standing <email@hidden>)



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