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.

        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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