Re: dispatch_source_create and deployment > 5.1
Re: dispatch_source_create and deployment > 5.1
- Subject: Re: dispatch_source_create and deployment > 5.1
- From: Jeff Evans <email@hidden>
- Date: Fri, 06 Feb 2015 11:00:24 -0800
David and others --
Is there any sample code somewhere that would should how to use create_dispatch_queue in apps built for ios 6 and greater?
I've been fooling around with this but cannot find anything that works except for this, which is for ios 5.1 and earlier:
m_dispatch_source = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0, m_dispatch_queue);
Judging from David's remark below about dispatch types becoming Obj-C objects at ios 6.0, it is probably the first argument that is causing this to crash if the app is built for ios >= 6.0. But in all the sample code I find, there is no mention of using anything other than DISPATCH_SOURCE_TYPE_TIMER as the first argument.
Thanks, Jeff
On Feb 3, 2015, at 10:57 AM, Jeff Evans wrote:
Sorry, I should have supplied that - it crashes inside create_dispatch_queue at -[OS_dispatch_source_xref_dispose] with "Thread 1: EXC_ARM_BREAKPOINT, subcode=0xdefe"
On Feb 3, 2015, at 10:48 AM, David Duncan wrote:
> On Feb 3, 2015, at 10:34 AM, Jeff Evans <email@hidden> wrote:
>
> All,
>
> I've been using an ios deployment target setting of 5.1, much against my will, because dispatch_source_create reliably crashes if I set the deployment target to 6.0 or higher. This gives people the impression that the app is compatible with ios 5.1, which it is not.
How is your app crashing?
IIRC, 6.0 was when dispatch types became Obj-C objects. I’m not certain what issues that may cause, but I don’t expect them to be insurmountable.
>
> The data type of the return value is dispatch_source_t. Someone has mentioned that create_dispatch_source returns an OS_dispatch_source instead of dispatch_source_t if deploying to ios >= 6.0. But OS_dispatch_source doesn't seem to be defined and I don't see how it can be used by dispatch_source_create.
>
> I've seen another mention of someone encountering this problem, but no one has responded to either. Are so few people using dispatch_source_create with deployments > ios 5.1? I have a feeling I'm making some dumb mistake here.
>
> Thanks, Jeff
>
>
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David Duncan
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