Re: NSThread limits?

[Sašo Kiselkov]

The problem you're experiencing is because GNUstep's runtime creates
threads with a detach state of PTHREAD_CREATE_JOINABLE, which don't
release the resources associated with the thread until another thread
calls a pthread_join() on the terminated thread in order to collect its
return status. Which is kind of a bug in GNUstep, because you have no
way of joining it manually.

Your best bet is creating the thread manually, not using the NSThread
API. I use the following code snippet to do the trick:

pthread_t thread;
pthread_attr_t attrs;

if ((code = pthread_attr_init (&attrs)))
  {
    // Error initializing thread attributes
  }

if ((code = pthread_attr_setdetachstate (&attrs, PTHREAD_CREATE_DETACHED)))
  {
    // Error setting thread attributes
  }

if ((code = pthread_create (&thread, &attrs, ThreadFuncCallback, NULL)))
  {
    // Error creating thread
  }

This has worked for me with thousands of threads being created and
terminated.

--
Saso

Marc Wan wrote:
> hello!
> 
>   I am looking to create a server that maintains a pool of a few
> hundred threads at a time, and being a fan of objective-c, i had hoped
> to be able to use GNUStep to do this on non-mac platforms.
> 
>   unfortunately, I don't seem to be able to fork more than about
> 150-160 threads using
> NSThread::detachNewThreadSelector:toTarget:withObject.  on my macs
> here, i can easily do 1000 (i didn't test higher).
> 
>   after this on Linux, I get:
> 
> : Uncaught exception NSInternalInconsistencyException, reason: Unable
> to detach thread (unknown error)
> 
> 
>   i had worried that this was a linux (ubuntu 6.10 LTS Server) issue,
> but /proc/sys/kernel/thread-max says that it'll handle over 143000
> threads ... some casual browsing of NSThread.m didn't immediately show
> any limitations.
> 
>   any idea why this might be happening?
> 
>   thanks,
>   mark.
> 
> 
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