Re: Thread-safe atomic property for array
Re: Thread-safe atomic property for array
- Subject: Re: Thread-safe atomic property for array
- From: "Clark S. Cox III" <email@hidden>
- Date: Sat, 15 Aug 2015 11:30:59 -0700
> On Aug 15, 2015, at 05:21, Sandy McGuffog <email@hidden> wrote:
>
> What guarantees that the current autorelease cycle doesn’t end in the middle of this code?
Because that’s how autorelease pools work.
> Actually, as I think about it, technically, the [[hostObject myArray] retain] should be wrapped in some kind of lock mechanism itself to make it atomic….
Nope. If, as has already been stated, myArray is an atomic property, that is already taken care of for you.
>> On Aug 15, 2015, at 2:10 PM, Mike Abdullah <email@hidden> wrote:
>>
>>> On 15 Aug 2015, at 13:07, Sandy McGuffog <email@hidden> wrote:
>>>
>>>> On Aug 15, 2015, at 1:14 PM, Mike Abdullah <email@hidden> wrote:
>>>>
>>>> NSArray *array = [hostObject myArray];
>>>> // run your checks, etc.
>>>> NSString *someString = [array objectAtIndex:2];
>>>
>>> Just to be safe:
>>>
>>> NSArray *array = [[hostObject myArray] retain];
>>> // run your checks, etc.
>>> NSString *someString = [array objectAtIndex:2];
>>> [array release];
>>>
>>> Or whatever other way of ensuring the array isn’t dealloced out from under you, depending on how you’re doing memory management
>>
>> No need. The OP has stated myArray is an atomic property. It’s guaranteed not to go away until the end of the current autorelease pool.
>>
>> If the above code did actually add some protection, it would mean the first line of code had a race condition in it where you might not be able to retain in time. You’d just be hiding the problem and making it less likely, rather than actually fixing it.
>
>
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