Re: Context in GCD source cancel handler?
Re: Context in GCD source cancel handler?
- Subject: Re: Context in GCD source cancel handler?
- From: Jonathon Kuo <email@hidden>
- Date: Thu, 6 Jan 2011 12:17:21 -0800
On Jan 5, 2011, at 12:41 PM, Dave Keck wrote:
>> Q: When a context object is set with dispatch_set_context(), is it retained? Or do I need to retain it first, set it, and then in the cancel handler release it?
>
> The 'context' argument is not retained. You can infer this primarily
> by the declaration of dispatch_set_context(), and also the mention
> that 'context' is "client defined" in dispatch/object.h; since the
> 'context' argument is an untyped pointer (void *),
> dispatch_set_context() cannot assume anything about the supplied
> 'context' argument, much less that it's a valid libdispatch object.
>
So I can supply anything here and GCD stores it _by value_, whether its a simple integer or even a object pointer?
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