Bless You! It still segfaults all over the place (which is
another story), but that particular call_user_function() now
works, thanks :) and happy easter egg searching ;)
- Markus
On Sun, Mar 31, 2002 at 01:11:27PM +0300, Zeev Suraski wrote :
> At 20:59 30/03/2002, Markus Fischer wrote:
> > Yes, exactly.
>
> Ok, in that case, by default this won't work 'very nicely' with PHP
> (because it's not very standard), but you should be able to get it to work
> relatively easily.
>
> The problem:
>
> All of PHP's resources (globals, memory management, resource lists,
> basically everything) are locked to a specific thread. If you use all of
> the standard macros (TSRMLS_FETCH(), TSRMLS_DC, etc.) then your code lives
> entirely within the thread in which it's running, and cannot access
> anything from other threads.
>
>
> The solution:
>
> If you need to manipulate resources of another thread, you can do so, but
> you have to do a bit of hacking on your own.
>
> 1. When you register the callback, you have to remember which thread you'd
> want to interface with when the callback is called. You can obtain the
> thread id by using tsrm_thread_id():
> THREAD_T thread_id = tsrm_thread_id();
>
> You have to store this information in a place which would be later
> accessible from the callback.
>
> 2. inside the callback, don't use TSRMLS_FETCH(). Instead, use the
> following line of code:
>
> void ***tsrm_ls = (void ***) ts_resource_ex(0, &thread_id);
>
> 3. It's important to remember that there are some things that you must not
> do inside your callback, due to mutual exclusion problems. For instance,
> doing any 'writes' to the resource lists, or even the memory manager - is
> likely to cause a crash due to race conditions with the thread that owns
> these resources. As long as you limit yourself to read-only data, it
> should be fine (even though I don't think we ever made sure that the data
> structures are safe for reading while another thread writes to them).
>
> That's about all I can tell you, other than good luck, and don't do it
> unless you really have to :)
>
> Zeev
>
>
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