Hello,
Thank you Jens Alfke, Peter Burtis and Stephen Joseph Butler for
your excellent, quick and helpful replies.
Thank you Jens for the heads up about the threading and for
letting me know that things are done this way in Cocoa -- I just
didn't want to be out in left field.
Below. for future searchers, are three techniques for sleeping
0.1 seconds. Please excuse my naive use of the phrase 'current thread'.
These two techniques don't require splitting your method into
'before' and 'after' parts. Downside is that they will stop all
activity in the current thread:
NSDate *future = [NSDate dateWithTimeIntervalSinceNow: 0.1];
[NSThread sleepUntilDate:future];
usleep(100000) // sleep 1/10 second, 10K microseconds
This one is neat since it uses a 'behind the scenes' timer.
Downside is that it requires 'splitting' your method into
'before' and 'after' parts. However, it is best if you are
waiting for some process to finish that is running in the
current thread:
[self performSelector: methodName withObject: nil
afterDelay: 0.1]; // uses behind the scenes timer
Stephen's technique has neither downside. It works perfectly
but I confess I'm nervous about releasing it to my client:
call
NSDate *future = [NSDate dateWithTimeIntervalSinceNow: 0.1];
[[NSRunLoop currentRunLoop] runUntilDate: future];
from your method. Stephen warns that the host method needs to
be re-entrant or guard against multiple entries.
Thanks and best regards to all,
Steve
Original message
how do I delay, wait, pause for a tenth of a second?
I don't want to use NSTimer because I just want to resume where
I left off. I don't want to be in a tight loop because I need
the system to finish something. I just want to pause execution
for a short time. I think there was a wait() in OS9. I found
a wait() in wait.h but it wants an int * and made me nervous.
Specifically, when I send a fetch message to an
NSArrayController, it sometimes takes a fraction of a second
for its selection to become valid. Currently I fire an NSTimer
to call a 'part 2' method to finish what I am doing (scrolling
the selection into view), but it lacks niceness.
delay
wait
pause
sleep
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