Re: Adding a Timer to a Thread
Re: Adding a Timer to a Thread
- Subject: Re: Adding a Timer to a Thread
- From: Andreas Grosam <email@hidden>
- Date: Tue, 26 May 2009 21:53:48 +0200
On May 26, 2009, at 8:53 PM, Ken Thomases wrote:
On May 26, 2009, at 1:27 PM, Jean-Daniel Dupas wrote:
Le 26 mai 09 à 20:15, Andreas Grosam a écrit :
What would you suggest is the preferred way to add a timer to a
different running thread?
Normally, I would use:
NSRunLoop *runLoop = [NSRunLoop currentRunLoop];
[runLoop addTimer:aTimer forMode:NSDefaultRunLoopMode];
However, this requires that it will be invoked from the context of
the target thread. How do I get the runLoop for any other than the
current thread?
NSRunLoop is not thread safe, so you don't get it. Even is it was
possible, you would not be able to use it.
That said, CFRunLoop is thread safe.
You can retrieve it using -
performSelector:onThread:withObject:waitUntilDone:modes passing a
mutable object as argument (an MutableArray for example) which will
be used to store the return value (your CFRunLoop).
- (void)retrieveCurrentRunLoop:(NSMutableArray *)array {
[array addObject:(id)CFRunLoopGetCurrent()];
}
Bleah. If you're going to interact directly with another thread
using -performSelector:onThread:..., don't ask it for its run loop
and then manipulate that. Just tell it to install the timer on its
own run loop. In that case, you can use NSRunLoop just fine.
Regards,
Ken
Thank you for your replies.
Yes, I thought it could work as Ken suggested. Now I'm going to try
this:
- (void) runTimer:(NSTimer*)aTimer
{
if ([NSThread currentThread] == self.thread) {
[[NSRunLoop currentRunLoop] addTimer:aTimer
forMode:NSDefaultRunLoopMode];
}
else {
[self performSelector:@selector(runTimer:)
onThread:self.thread withObject:aTimer waitUntilDone:NO];
}
}
Regards
Andreas
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