On May 31, 2012, at 2:00 PM, Jean-Daniel Dupas <[email protected]> wrote:
> Le 31 mai 2012 à 18:00, Jens Alfke a écrit :
>
>> On May 31, 2012, at 8:47 AM, Antonio Nunes wrote:
>>
>>> static void *kMyVLFContext = &kMyVLFContext;
>> ...
>>> @synchronized(kMyVLFContext) {
>>
>> Huh? I thought the parameter to @synchronized(…) had to be an object
>> reference?
>
>
> The Objective-C reference agree with you.
>
> «The @synchronized() directive takes as its only argument any Objective-C
> object, including self.»
>
> http://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/ObjectiveC/Chapters/ocThreading.html%23//apple_ref/doc/uid/TP30001163-CH19-SW1
>
> I'm surprised the compiler does not complain when passing an arbitrary
> pointer.
That's because the compiler can't know it's invalid, due to the use of void *
as the var type (void * pretty much matches everything, including id, must like
id matches any object reference).
Suggestions:
1. remove the k prefix, by convention that is reserved for constants
2. don't use the same var name for a local variable as for a global variable
3. That should be something like:
static VLFContext* myVLFContext = nil;
...
if( !myVLFContext )
myVLFContext = [VLFContext alloc] init];
...
@synchronized( myVLFContext ) {
...
}
-lane
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