Re: GCD and blocks cross development
Re: GCD and blocks cross development
On 10 Sep 2009, at 09:33, Jean-Daniel Dupas wrote:
My main concern would be block runtime linking issues. When you use
blocks, the compiler generate call to the block runtime (libSystem
on SL), but does it generate weak symbol or will the program crash
at launch time on 10.5.
Note that a simple test will give the answer, but I don't have both
OS right now.
This code (called from an obj-c method) runs on 10.6 but fails on 10.5
suggesting that cross development with GCD is not possible.
The crash report reports symbol not found __NSConcreteStackBlock in /
usr/lib/libSystem.B.dylib
This would seem to suggest that even if dispatch_get_global_queue() is
weakly linked the block symbols are not.
if (dispatch_get_global_queue(0, 0) != NULL) {
NSUInteger myInt = 1234;
NSLog(@"GCD dispatch...", nil);
dispatch_async(dispatch_get_global_queue(0, 0), ^{
NSString *myString = [NSString stringWithFormat:@"GCD dispatch:
%u", myInt];
dispatch_async(dispatch_get_main_queue(), ^{
NSLog(@"Main thread: %@", myString);
});
});
NSLog(@"GCD dispatch sent", nil);
} else {
NSLog(@"GCD dispatch unavailable", nil);
}
Le 10 sept. 2009 à 00:49, Steve Christensen a écrit :
My understanding is that GCD is only supported on 10.6 and later.
This means you'd need to have some sort of runtime check that would
perform your tasks without GCD if running on a pre-10.6 OS version.
On Sep 9, 2009, at 3:04 PM, email@hidden wrote:
Sorry, not quite sure which list to hit here/
The Grand Central Dispatch headers seem to include availability
macros.
Does that mean we can cross development for a deployment target of
10.5 with a 10.6 base SDK and use blocks and GCD?
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-- Jean-Daniel
Jonathan Mitchell
Developer
http://www.mugginsoft.com
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