I have to add that using dispatch_async on main queue within an NSApp will
automatically drain the autorelease pool.
AppKit drains the autorelease pool upon NSEvents dispatch.
On Mon, Apr 19, 2010 at 12:36 PM, Julien Jalon <jja...@gmail.com> wrote:
> I don't see anything wrong with the output being 1/2:
>
> -(void) test
> {
> testString = NULL;
>
> dispatch_async(dispatch_get_global_queue(0, 0), ^{
> dispatch_async(dispatch_get_main_queue(), ^{
>
> NSString* aString = [[NSMutableString alloc] init];
> * // retain count is 1*
>
> NSLog(@"retainCount: %d",[aString retainCount]);
>
> testString = [aString retain]; *// retain count is
> 2*
>
> [aString *auto*release]; *// retain count is still
> 2 - object will be released sometimes in the future*
>
>
> dispatch_async(dispatch_get_main_queue(), ^{
> NSLog(@"retainCount: %d",[testString
> retainCount]);* // you can't assume the future release has already been
> called*
> });
> });
> });
> }
>
> On Mon, Apr 19, 2010 at 11:35 AM, Henk Kampman <
> henk.kamp...@secondmove.com> wrote:
>
>> Have a look at the following code
>>
>> -(void) test
>> {
>> testString = NULL;
>>
>> dispatch_async(dispatch_get_global_queue(0, 0), ^{
>> dispatch_async(dispatch_get_main_queue(), ^{
>>
>> NSString* aString = [[NSMutableString alloc] init];
>> NSLog(@"retainCount: %d",[aString retainCount]);
>>
>> testString = [aString retain];
>>
>> [aString release];
>>
>> dispatch_async(dispatch_get_main_queue(), ^{
>> NSLog(@"retainCount: %d",[testString
>> retainCount]);
>> });
>> });
>> });
>> }
>>
>> As expected the output is:
>>
>> retainCount: 1
>> retainCount: 1
>>
>> However when I change [aString release] to [aString autorelease] the
>> output shows:
>>
>> retainCount: 1
>> retainCount: 2
>>
>> Why?
>>
>> BTW I first noticed this behavior when my application started leaking the
>> QTMovie objects I was creating in a block.
>>
>> -
>>
>> Henk_______________________________________________
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>
>
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