Re: How to set up a thread listening to performSelector: messages?
Re: How to set up a thread listening to performSelector: messages?
- Subject: Re: How to set up a thread listening to performSelector: messages?
- From: "Oleg Krupnov" <email@hidden>
- Date: Thu, 25 Sep 2008 18:53:43 +0300
I actually have tried this. My code looks like this (is it correct?):
@implementation Worker
- (void)threadMain:(id)data
{
runLoop = [NSRunLoop currentRunLoop];
[runLoop addPort:[NSMachPort port] forMode:NSDefaultRunLoopMode];
while(true)
{
[runLoop run];
}
}
- (void)processRequest:(id)sender
{
NSLog(@"hello");
}
@end
Then from the main thread I send:
[[worker runLoop] performSelector:@selector(processRequest:)
target:worker argument:request order:0 modes:[NSArray
arrayWithObject:NSDefaultRunLoopMode]];
This time the -[NSRunLoop run] method does not exit immediately.
However the problem is that processRequest is never called and the
-[NSRunLoop run] never exits.
What can be wrong? Should it work like this at all?
On Thu, Sep 25, 2008 at 6:46 PM, Ken Thomases <email@hidden> wrote:
> On Sep 25, 2008, at 10:30 AM, Oleg Krupnov wrote:
>
>> I want to create a secondary thread with its run loop running
>> (sleeping) until a performSelector is sent to it. Then it wakes up,
>> performs the selector, and go to sleep again. I imagine it to be
>> something like this:
>>
>> - (void)threadMain:(id)data
>> {
>> while(true)
>> {
>> [[NSRunLoop currentRunLoop] run];
>> }
>> }
>>
>> However, the -[NSRunLoop run] method exits immediately, because, in
>> accord with the the docs, there are no input sources or timers
>> attached to the run loop.
>>
>> So I need to set up an input source, right?. The docs say input
>> sources can be port-based or custom *OR* just performSelector calls. I
>> am interested only in the performSelector calls.
>>
>> So what should my code look like to set up such input source?
>
> You can just create an NSPort and add it to the run loop. It doesn't matter
> that you won't actually be using the port.
>
> Cheers,
> Ken
>
>
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