That depends entirely on how the singleton behaves - if it behaves correctly
when called from multiple threads/queues, and from different contexts, it
should be fine. If the interface needs ordering across calls you'll need to
add a lock.
For example, if the interface is just
-(id)getLatestThing
you're probably in good shape.
If it's something like
-(void)setSomeState:(id)state
-(id)getResults
you'll need to lock, otherwise another thread could setSomeState to something
else between the two calls and you'll get undefined results. Not to mention
that just setting state might not be thread-safe (and since thread-safety
doesn't compose, you can't count on FramesProducer's internal locks helping you
anyway even if it doesn't crash).
On Dec 23, 2014, at 2:20 AM, Nisar Ahmed <nisar....@gmail.com> wrote:
> I am using QCRenderer to render a composition which has a custom plugin
> generating video from hardware device. I am also using same hardware device
> inside the host application using an static object using dispatch_once token
> so that this object is never created twice.
>
> Can I reuse that static object inside my plugin instead of creating a new
> instance? I have tried using same class inside my QCPlugin target but
> QCPlugin is initialising its own instance which is of course failing because
> hardware is already in use.
>
> +(id)sharedProducer
> {
> static FramesProducer *producer;
> static dispatch_once_t onceToken;
> dispatch_once(&onceToken, ^{
> producer = [[FramesProducer alloc] initWithDeviceIndex:1];
> NSLog(@"producer %@", producer);
> });
> return producer;
> }
>
> Thanks
> Nisar
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