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I have some code where I am using dispatch_semaphore_t to signal operation completion. When the semaphore is a member variable, it does not seem to behave correctly. I will show example code that works and an example that does not seem to work: @implementation someClass { dispatch_semaphore_t memberSem; dispatch_semaphore_t* semPtr; NSThread* worker; BOOL taskDone; } - (id)init { // Set up the worker thread and launch it - not shown here. memberSem= dispatch_semaphore_create(0); semPtr= NULL; taskDone= FALSE; } - (void)dealloc { // Clean up the worker thread as needed - not shown here. if(

I have a function which takes a block as parameter: typedef void (^ MyBlock)(int); -(void)doTask:(MyBlock)theBlock{ ... } I need to run above function on another thread, I want to use - performSelector:onThread:withObject:waitUntilDone: , my current code: NSThread *workerThread = [[NSThread alloc] init]; [workerThread start]; [self performSelector:@selector(doTask:) onThread:workerThread withObject:??? waitUntilDone:NO]; BUT, How can I pass MyBlock parameter with this approach? (Please don't suggest GCD, I am wondering how can I do with my current code, is it possible?) This answer assumes you

I am new to NSoperation . NSoperation is a singleshot object. How can we achieve multiple operations concurrently through NSoperation ? is it possible without NSoperationQueue ? Even if we use NSoperationQueue, it will perform operations FIFO format.How will it execute Concurrently? If you want to implement a concurrent operation —that is, one that runs asynchronously with respect to the calling thread—you must write additional code to start the operation asynchronously. For example, you might spawn a separate thread, call an asynchronous system function, or do anything else to ensure that the

I have object with .delegate property which i manipulate in method 'doJob'. I assign this property with 'self' and my function is being called when this object finishes his job. Till now everything is fine. Now i want to manipulate this object in a separate thread. I'm using [NSThread detachNewThreadSelector...] to run the 'doJob' function. In this case my delegate method not being called. I guess this is because 'self' points to new thread instead of main one. Ok. I'm passing self as argument to function while creating the thread and it still not working. What do i miss? my current code is as

When I do po [NSThread currentThread], I got {name = (null), num = 4} When I look to the left I see: Looks like it's Thread number 6, not 4. Also what properties do we need to call to get that thread numbers anyway? [NSThread currentThread].number? Doesn't exist though. Thread numbers are meaningless, pretty much. The thread instance, though, is a singleton per thread. You could use the NSThread's address, by coincidence. Better, still, would be to dip down to the mach_* API and grab the thread ID from that API. [NSThread currentThread] is about as unique of a number as you'll get. If the

I have an asynchronous server request in my iOS app: [self performSelectorInBackground:@selector(doSomething) withObject:nil]; How can I detect the end of this operation? Put a call at the end of the doSomething method?! - (void)doSomething { // Thread starts here // Do something // Thread ends here [self performSelectorOnMainThread:@selector(doSomethingDone) withObject:nil waitUntilDone:NO]; } Nathan Jones If you just want to know when it's finished (and don't want to pass much data back - at which point I would recommend a delegate) you could simply post a notification to the notification

Please look at this code: @interface myObject:NSObject -(void)function:(id)param; @end @implementation myObject -(void)function:(id)param { NSLog(@"BEFORE"); [[NSRunLoop currentRunLoop] runUntilDate:[NSDate dateWithTimeIntervalSinceNow:20]]; NSLog(@"AFTER"); } @end int main(int argc, char *argv[]) { myObject *object = [[myObject alloc] init]; [NSThread detachNewThreadSelector:@selector(function:) toTarget:object withObject:nil]; @autoreleasepool { return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class])); } } The function method is called but there's no 20 seconds pause