Re: [Boost-users] shared_array EXC_BAD_ACCESS

From: Christopher Hunt (huntc_at_[hidden])
Date: 2005-08-01 20:30:49

I forgot to mention one other (important) thing: I'm using libgmalloc  
(http://developer.apple.com/documentation/Darwin/Reference/ManPages/ 
man3/libgmalloc.3.html).

When I don't use this guard-malloc approach, all is well. :-P

-C

On 02/08/2005, at 10:52 AM, Christopher Hunt wrote:

> I have some more information and a work-around. I can now reproduce  
> this problem in my Obj-C program with the following code:
>
>     typedef checked_array_deleter<unsigned short> deleter;
>     detail::sp_counted_base_impl<unsigned short, deleter>* theP = new  
> detail::sp_counted_base_impl<unsigned short, deleter>(0, deleter());
>
> However if I define either BOOST_SP_USE_QUICK_ALLOCATOR or  
> BOOST_SP_USE_STD_ALLOCATOR then all is well. :-)
>
> Here's my new stack trace for when things don't go well:
>
> #0	0x90012d68 in pthread_mutex_init
> #1	0x00088484 in boost::detail::lightweight_mutex::lightweight_mutex()  
> at lwm_pthreads.hpp:47
> #2	0x00088084 in boost::detail::lightweight_mutex::lightweight_mutex()  
> at lwm_pthreads.hpp:49
> #3	0x00087c24 in boost::detail::sp_counted_base::sp_counted_base() at  
> shared_count.hpp:98
> #4	0x00086674 in boost::detail::sp_counted_base::sp_counted_base() at  
> shared_count.hpp:99
> #5	0x00097f64 in boost::detail::sp_counted_base_impl<unsigned short,  
> boost::checked_array_deleter<unsigned short>  
> >::sp_counted_base_impl(unsigned short,  
> boost::checked_array_deleter<unsigned short>) at shared_count.hpp:253
> #6	0x00097f0c in boost::detail::sp_counted_base_impl<unsigned short,  
> boost::checked_array_deleter<unsigned short>  
> >::sp_counted_base_impl(unsigned short,  
> boost::checked_array_deleter<unsigned short>) at shared_count.hpp:253
>
> This thus looks like something to do with allocators and  
> sp_counted_based_impl...
>
> I don't see that my Obj-C environment has set up anything interesting  
> by the way of allocators, and I did create a brand-new Obj-C project  
> to see if I could reproduce the problem - I couldn't... however I'm  
> thinking that this might well have something to do with Obj-C...
>
> Any ideas?
>
> Also, if I'm to define BOOST_SP_USE_QUICK_ALLOCATOR or  
> BOOST_SP_USE_STD_ALLOCATOR then which is best? I've been unable to  
> find documentation on the use of these defines.
>
> Thanks for your help.