- DOES YACREADER SYNC IN THE NACKGROUND FOR MAC
- DOES YACREADER SYNC IN THE NACKGROUND CODE
- DOES YACREADER SYNC IN THE NACKGROUND PC
DOES YACREADER SYNC IN THE NACKGROUND PC
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DOES YACREADER SYNC IN THE NACKGROUND FOR MAC
Let’s consider a more practical example of the latter scenario.CBR Reader for Mac Free Download: CBR Reader for Mac is one of the best apps that will let you read, browse, and manage all of your comic book collections. CBR Reader Mac PC app is an excellent way to read and manage all of your digital comics. It does this because there are certain things that must run on the main queue (such as UI updates), and if you’re dispatching it to the main queue, it will always honor that request, and not try to do any optimization to avoid context switches. Print(#function, "needless to say, this async will run on the main thread isMainThread =", Thread.isMainThread) Print(#function, "even though it’s sync, this will still run on the main thread isMainThread =", Thread.isMainThread) In this case, GCD will not do the aforementioned optimization, but rather will always run the task dispatched to the main queue on the main queue: // but this time, we'll dispatch from background queue _to_ the main queue
DOES YACREADER SYNC IN THE NACKGROUND CODE
So, GCD is smart enough to figure out “well, if this thread is going to not do anything while I’m waiting for the block of code to run, I might as well run it here if I can, and save the costly context switch to another thread.”īut in the following scenario, we’re doing something on some background queue and want to dispatch it back to the main queue. When you use sync, you’re telling GCD “hey, have this thread wait until the other thread runs this block of code”. Print(#function, "but this async will run on the background queue's thread isMainThread =", Thread.isMainThread) Print(#function, "this sync will run on the current thread, namely the main thread isMainThread =", Thread.isMainThread) We'll dispatch from main thread _to_ background queue So, here is the well known sync optimization where the dispatched block will run on the current thread: let backgroundQueue = DispatchQueue(label: "internalqueue", attributes. It’s not a question of whether you’re dispatching from the main queue, but rather if you’re dispatching to the main queue. I believe you’re misreading that comment in the header. Why does the sync method on a background dispatch queue cases the code to run on the main thread, but async doesn't? I can clearly read that the sync method on a queue shouldn't be ran on the main thread, but why does my code ignore that scenario? / submitted it, except when the queue is the main queue orĪgain: except when the queue is the main queue When reading the sync description in the Swift source, I read the following: /// As an optimization, `sync(execute:)` invokes the work item on the thread which I would expect to see the exact same debug information when I use sync instead of async. Below is an attached image of the threads when the assertion failed. This is what I would expect to happen with sync aswell. When I change sync for async, the assertion fails. Is my queue scheduled on the main thread (thread 1)? Strange, because normally I see the main thread label on thread 1. In the debugger I see that when constructing the x instance, that I am in my queue on thread 1 (by seeing the label). I would expect the code is not ran on the main thread. Surprising enough (for me), is that this code doesn't throw any error! I would expect the assertion would fail.
Let queue = DispatchQueue(label: "internalqueue", qos. Just started to learning about GCD and I am running into trouble because my code is still ran on the main thread while I created a background queue.
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