detachNewThreadSelector:target:withObject: retains both the target and the
object.
-BJ
On Wed, Jun 2, 2010 at 11:39 AM, Jerry Krinock <je...@ieee.org> wrote:
> I allocate an object Foo on the main thread. Then I spin off a secondary
> thread and give it a long task to do there, but immediately release the
> object, on the main thread. I expect that the -release invoke -dealloc
> immediately, on the main thread. To my amazement, the object is not
> deallocced until the task is finished, and to my further amazement, the
> dealloc method runs on the secondary thread.
>
> Someone please enlighten me. This is Mac OS 10.6.3, Objective-C garbage
> collection = unsupported.
>
> Jerry Krinock
>
>
> #import <Cocoa/Cocoa.h>
>
> @interface Foo : NSObject {
> }
> @end
>
> @implementation Foo
>
> - (void)sleep5 {
> NSLog(@"Sleeping for 5 on secondary thread") ;
> sleep(5) ;
> }
>
>
> - (void)dealloc {
> [super dealloc] ;
> NSLog(@"Did dealloc a Foo") ;
> }
>
> @end
>
>
> int main(int argc, char *argv[]) {
> NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init] ;
>
> Foo* foo = [[Foo alloc] init] ;
> [NSThread detachNewThreadSelector:@selector(sleep5)
> toTarget:foo
> withObject:nil] ;
> [foo release] ;
>
> sleep(10) ;
>
> NSLog(@"Terminating") ;
> [pool release] ;
> return 0 ;
> }
>
> RESULT:
>
> 10:23:00.879 LittleTool[83071:1103] Sleeping for 5 on secondary thread
> 10:23:05.884 LittleTool[83071:1103] Will dealloc a Foo
> 10:23:05.885 LittleTool[83071:1103] Did dealloc a Foo
> 10:23:10.879 LittleTool[83071:80f] Terminating
>
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