dispatch

I am developing ui automation platform for android. For some reason sometimes (very rare) click events can be dropped When it happen I see in log I/InputDispatcher( 2707): Dropped event because input dispatch is disabled. Please advise what can be done to enable input dispatch. Thank you in advance There are certain conditions in which Input Dispatcher will drop the input events: DROP_REASON_BLOCKED : If current application is not responding and user is tapping on device, input event will be dropped DROP_REASON_STALE: Dropped event because it is stale DROP_REASON_APP_SWITCH: Dropped event

I wondered if Java7's new invokedynamic bytecode instruction could be used to implement multiple dispatch for the Java language. Would the new API under java.lang.invoke be helpful to perform such a thing? The scenario I was thinking about looked as follows. (This looks like an application case for the visitor design pattern, but there may be reasons that this is not a viable option.) class A {} class A1 extends A {} class A2 extends A {} class SomeHandler { private void doHandle(A1 a1) { ... } private void doHandle(A2 a2) { ... } private void doHandle(A a) { ... } public void handle(A a) {

I'm trying to speed up a variable-bitwidth integer compression scheme and I'm interested in generating and executing assembly code on-the-fly. Currently a lot of time is spent on mispredicted indirect branches, and generating code based on the series of bitwidths as found seems to be the only way avoid this penalty. The general technique is referred to as "subroutine threading" (or "call threading", although this has other definitions as well). The goal is to take advantage of the processors efficient call/ret prediction so as to avoid stalls. The approach is well described here: http:/

I´m trying to set up an iteration for downloading images. The whole process works, but taking a look in the console´s output, something seems to be wrong. func download() { let logos = [Logos]() let group = DispatchGroup() logos.forEach { logo in print("enter") group.enter() if logo?.data == nil { let id = logo?.id as! String if let checkedUrl = URL(string: "http://www.apple.com/euro/ios/ios8/a/generic/images/\(id).png") { print(checkedUrl) LogoRequest.init().downloadImage(url: checkedUrl) { (data) in logo?.data = data print("stored") group.leave() print("leave") } } } } print("loop finished")

I know there are a lot of contributions already for this topic. I tried different variations with DispatchGroup , but it seems I'm not able to make the whole loop stop until a certain task is finished. let names = ["peter", "susan", "john", "peter", "susan", "john"] var holding = [String: [Double]]() for i in 0...10 { for name in names { if holding[name] == nil { Alamofire.request("https://jsonplaceholder.typicode.com", parameters: parameters).responseJSON { responseData in // do stuff here holding[name] = result } } else { // do other stuff with existing "holding[name]" } // if if holding

I need help understanding this piece of code. What is the point of handler.guid ? Why is there a need for a hash table? What is the point of: if ( element["on" + type]) { handlers[0] = element["on" + type]; } What does the "this" refer to in handleEvent , the element or the the addEvent function? function addEvent(element, type, handler) { // assign each event handler a unique ID if (!handler.$$guid) handler.$$guid = addEvent.guid++; // create a hash table of event types for the element if (!element.events) element.events = {}; // create a hash table of event handlers for each element/event

Is this the right way? // convert const void *buffer = NULL; size_t size = 0; dispatch_data_t new_data_file = dispatch_data_create_map(data, &buffer, &size); if(new_data_file){ /* to avoid warning really - since dispatch_data_create_map demands we care about the return arg */} NSData *nsdata = [[NSData alloc] initWithBytes:buffer length:size]; // use the nsdata... code removed for general purpose // clean up [nsdata release]; free(buffer); // warning: passing const void * to parameter of type void * It is working fine. My main concern is memory leaks. Leaking data buffers is not fun. So is the

In Swift 3, the creation of a DispatchQueue instance: DispatchQueue(label: String, qos: DispatchQoS, attributes: DispatchQueue.Attributes, autoreleaseFrequency: DispatchQueue.AutoreleaseFrequency, target: DispatchQueue?) I see the sample codes from StackOverFlow, it can be nil, .global() or .main, what's the meaning of this target parameter? I guess .main means the queue will run on main thread, but what for .nil or .global() ? Code Different There's no documentation for Swift so I dropped back to the old documentation for GCD. The closest that I've found is for the function dispatch_set

As Apple's document says, dispatch_get_global_queue() is a concurrent queue, and dispatch_sync is something meaning serial.Then the tasks are processed async or sync? You're getting confused between what a queue is and what async vs sync means. A queue is an entity on which blocks can be run. These can be serial or concurrent. Serial means that if you put block on in the order A, B, C, D, then they will be executed A, then B, then C, then D. Concurrent means that these same blocks might be executed in a different order and possibly even more than one at the same time (assuming you have