Notifications on main thread
Notifications on main thread
- Subject: Notifications on main thread
- From: Jonny Taylor <email@hidden>
- Date: Tue, 18 May 2010 15:34:21 +0100
Hi all,
I have been programming on the mac for many years but have only just started trying to get the hang of cocoa. I have a particular question about NSNotification that I hope somebody will be able to help with.
My code works with a firewire video camera, and receives callbacks from the camera driver when a new video frame is received. Whenever this occurs, the UI needs to be updated to display the latest video frame. The UI update must run on the main thread - the callback thread is not a suitable place to do the update. Furthermore I would like to use NSPostWhenIdle and coalescing - if several new frames arrive between updates then we only need to draw the most recent.
I am not sure how I should be achieving this.
- I can call enqueueNotification on the default queue, but this will never run since the callback thread is not running a CFRunLoop, and is not the thread I wanted it to run on anyway.
- I could try acquiring the NSNotificationQueue for the main thread, but there does not appear to be a standard way of doing that. I have seen this suggested as a strategy elsewhere, but I think I have also read that one is not meant to post to queues other than that of the current thread (not sure why...).
- I could try using NSDistributedNotificationCenter, but that seems overkill for what I want in terms of performance and its inherent limitations.
I feel there must be a simple way of doing what I want - can anybody advise?
Thanks in advance
Jonny
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