nsrunloop

I am trying to monitor a stream of video output from a FireWire camera. I have created an Interface Builder interface with buttons and an NSImageView . While image monitoring is occurring within an endless loop, I want to: change some camera parameters on the fly (gain, gamma, etc.) tell the monitoring to stop so I can save an image to a file (set a flag that stops the while loop) Using the button features, I have been unable to loop the video frame monitor, while still looking for a button press (much like using the keypressed feature from C.) Two options present themselves: Initiate a new

Please consider the following pieces of code: In the first one i call a function which creates an animation. i do that with a certain time interval: start:; [self animationMethod]; [[NSRunLoop currentRunLoop] runUntilDate:[NSDate dateWithTimeIntervalSinceNow:3]]; //sleep(3); goto start; In the second one i create an animation - (void)animationMethod { CAKeyframeAnimation *myAnimation = [CAKeyframeAnimation animationWithKeyPath:@"position"]; CGMutablePathRef curvedPath = CGPathCreateMutable(); CGPathMoveToPoint(curvedPath, NULL, start.x, start.y); CGPathAddCurveToPoint(curvedPath, NULL, fcp.x,

I am trying to understand the concept of RunLoops. I have read Apple developer's guide on RunLoops and to some extent I have understood the concept of RunLoops. To make my concept more clearer I wrote a very simple code which uses RunLoops in it. The code can be seen below. - (void)viewDidLoad { [super viewDidLoad]; thread = [[NSThread alloc] initWithTarget:self selector:@selector(testMethod) object:nil]; [thread start]; } - (void)testMethod { NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init]; NSLog(@"Thread Entered"); NSMachPort* dummyPort = [[NSMachPort alloc] init]; [[NSRunLoop

How to wait inside the NSThread until some event occur in iOS? eg, We created a NSThread and started a thread loop. Inside the thread loop, there is condition to check whether the message queue has any messages. If there is a message, then it will call the corresponding method to do some operation, else it should wait until the message queue gets populated with a new message. Is there any API or methods available to wait until some event occur? For Example NSThread *thread = [NSThread alloc]....@selector(threadLoop) - (void)threadLoop { // Expecting some API or method that wait until some

The following things are what I know & understand: Global queue is a concurrent queue which can dispatch tasks to multiple threads. The order of executing task is not guaranteed. e.g.: dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT,0), { for (int i; i<10; i++) { doTask() } }) If I want to dispatch to serial queue, I can use dispatch_async(dispatch_queue_create("my.serial.queue", nil) { ... } each time only one task is dispatched to a thread & get executed. The order is FIFO. ===== What I am confused & not fully understand ======= The main thread has a NSRunLoop,

I've got a NSMenu attached to a NSStatusItem (a menu bar application). While downloading a file I want to display a NSProgressIndicator in an item of this menu. I've created a NSViewController subclass for this progress indicator with the following properties: @property NSUInteger current; // Bound to NSProgressIndicator value @property NSString *status; // Bound to a NSTextField value @property NSUInteger total; // Bound to NSProgressIndicator max value When needed I start the download of the file with the following code, which runs in NSRunLoopCommonModes so that the delegate methods are