From: "ara.t.howard" <ara.t.howard@...>
Date: 2008-09-18T03:41:37+09:00
Subject: Re: Threads preventing garbage collection?


On Sep 17, 2008, at 10:21 AM, Brian Candler wrote:

> Ara Howard wrote:
>> but that it expected?  you have a Foo which referes to a Thread which
>> has not died that is itself referred to by the global Thread.list
>>
>> cfp:~ > ruby -e' 41.times{ Thread.new{ sleep } }; p  
>> Thread.list.size '
>> 42
>
>   Foo ------------>
>                     thread
>   thread list ---->
>
> I don't think this should prevent garbage collection of Foo, if  
> nothing
> is holding a reference to Foo
> -- 
> Posted via http://www.ruby-forum.com/.
>

but threads *do* hold their context


void
rb_thread_schedule(void)
{
     thread_debug("rb_thread_schedule\n");
     if (!rb_thread_alone()) {
	rb_thread_t *th = GET_THREAD();

	thread_debug("rb_thread_schedule/switch start\n");

	 
rb_gc_save_machine_context 
(th);                                             //  <--  global state
	native_mutex_unlock(&th->vm->global_interpreter_lock);
	{
	    native_thread_yield();
	}
	native_mutex_lock(&th->vm->global_interpreter_lock);

	rb_thread_set_current(th);
	thread_debug("rb_thread_schedule/switch done\n");

	RUBY_VM_CHECK_INTS();
     }
}












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