Re: CPU utilization in Snow Leopard
Re: CPU utilization in Snow Leopard
- Subject: Re: CPU utilization in Snow Leopard
- From: Joar Wingfors <email@hidden>
- Date: Tue, 20 Oct 2009 09:00:32 -0700
On 19 okt 2009, at 23.37, Graham Cox wrote:
Since there's no autorelease pool inside your do...while loop, of
course it isn't going to get autoreleased then. Autorelease isn't
magic, someone has to tell it when it can release - that's you. Put
your pool inside the loop so it is created and destroyed each time.
In all fairness, this isn't your responsibility for the most part. For
high frequency / long lived loops it typically is though.
On 19 okt 2009, at 23.41, Graham Cox wrote:
-(void)newThread
{
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc]init];
//Some operations...
do //Keeps thread alive till date
{
[[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode
beforeDate:[NSDate dateWithTimeIntervalSinceNow: 0.1]];
} while (mShouldThreadAlive); //Waiting for other process to
complete
[pool release];
}
Mind you, having said what I just said, this is a bad approach
anyway. You should not "keep a thread alive" until it gets some
flag, that's just wasting CPU time doing nothing but spinning.
Instead the thread should sleep until it has something to do. If you
need to wait for another thread to finish, use a NSConditionLock to
do it properly. Also, if this code is representative, you are
spinning it after all the processing has finished, which is
pointless. Just let it terminate if it has nothing more to do.
It's unclear what the purpose of the loop at the end of this method is
intended to serve. From the code posted here I would agree with Graham
that it seems likely that a condition lock is more appropriate.
Do you need a run loop for some reason? Are you using it to
communicate with the thread?
j o a r
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