On 05.07.2012, at 21:57, Charlie Dickman wrote:
> I have a demonstration app that is basically operating on a 0.15 second timer
> loop. The problem I am having is that even with a periodic timer going off it
> is very difficult to get menu events and mouse clicks in window controls
> through to be processed. I have tried setting up an additional flow of events
> using
> (NSEvent) +
> (void)startPeriodicEventsAfterDelay:(NSTimeInterval)delaySecondswithPeriod:(NSTimeInterval)periodSeconds
>
> as well as
>
> [[NSRunLoop currentRunLoop] runUntilDate: [NSDate
> dateWithTimeIntervalSinceNow: t != 0. ? t * 1.01 : .01]]
>
> (where t can be set arbitrarily but is typically called with a value of 0.15)
> but none of this improves response. Is there anything else to try?
It's not how long you give time to the event loop, it is how often. Also,
startPeriodicEventsAfterDelay: is intended for mouse tracking, not for
general-purpose timers. You're being very vague and fuzzy with your
terminology, so I hope you don't mind if I just spell out how I'd do a periodic
task, and then you can tell whether that's what you're doing and when you're
doing it differently:
-> Use an NSTimer to get your periodic processing time, not other calls.
-> Let the rest of the app run normally
-> Do the minimum amount of work needed in your timer. Timers run on
your main thread & run loop, so you have to do short bits of work so the OS can
"come up for breath" often enough. E.g. do your pre-loop setup, then put the
loop body in the timer (using instance variables for the counter & other stuff
you need to keep around between iterations), and then do 1 iteration per timer
fire.
-> Don't use blocking calls (like network access) on the main run loop,
use calls that do their work on another thread and then call you back when
they're done (e.g. NSURLConnection, not NSURL -initWithContentsOfURL:).
Or, if you can run your stuff on a secondary thread, queue up your little bits
of work in an NSOperationQueue or other GCD-backed queue that runs on another
thread.
Cheers,
-- Uli Kusterer
"The Witnesses of TeachText are everywhere..."
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