Re: How to Delay, Wait, Pause...
Re: How to Delay, Wait, Pause...
- Subject: Re: How to Delay, Wait, Pause...
- From: Jens Alfke <email@hidden>
- Date: Sun, 25 May 2008 09:53:13 -0700
On 25 May '08, at 2:40 AM, Thomas Davie wrote:
I hate to say this, but any form of delay here is the *wrong* way to
do this. You already know you have a race condition, all you're
doing is making it so the race condition will work out in your favor
99.99% of the time. There are still exceptional cases where the OS
will be busy doing something and your 0.1 second sleep will not be
enough to sort it out. Instead of doing this, do your threading
properly, and get your locking right.
This is correct advice when it comes to interactions between multiple
threads; but Steve's problem involves only a single thread. The timing
here is measured in iterations of the thread's runloop, not in clock
time. As Dmitri put it:
From 10.4 on fetch: results are delayed until the next iteration of
the run loop
So I believe that any technique that cranks the runloop through at
least one iteration will solve the problem, and that includes any sort
of timer or perform-after-delay. (I often use performAfterDelay: 0.0,
though it looks nonsensical on first glance, to delay some action
until the very next runloop iteration.)
—Jens
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