Hello,
As mentioned in an earlier email I would like to introduce an auto-deleted
temporary strings API. For now it is called eina_slstr for short-live
strings[1]. The strings will be collected by the main loop after each
iteration, or whenever the thread exits, or on a manual call to the clear
function (eg. from a looping thread).
Firstly, I can not reuse eina_tmpstr for this as it is used from multiple
threads. I tried. It made make check (eio_monitor) fail. So this requires a
whole new set of APIs.
// The goal is to be able to do something like:
ERR("This object %s is going crazy", object_string_get(obj));
// With something like:
const char *object_string_get(Eo *obj)
{
return eina_slstr_printf("%s@%p (%s)",
efl_class_name_get(obj), obj, efl_name_get(obj));
}
And not care about freeing the string. In an EO file we would just return a
"string" and the caller would need to then strdup() it to keep it alive.
A del() function is optional (there is none in my patch).
A working implementation is in my devs/jpeg/work branch.
For this, I could reuse the Eina_FreeQ introduced by raster but add a new
behaviour. For now it's purely used for debugging as a "safe" call to free
(although it is arguable whether it will not in fact make debugging harder
in some cases).
I'd like to introduce a POSTPONED mode where the freeq is not equivalent to
free() but rather queues up an item that will be collected at the next call
to the clear() function. Ecore main loop would clear automatically for the
main thread. Other threads would clear on exit automatically.
This kind of queue would need to be thread local. Failure to clear the
queue from a looping thread would lead to massive memory leaks.
(optional) Another idea would be to have a MAIN_LOOP mode where the item to
be deleted will be pushed to a thread-safe queue flushed from the main
loop. (note: this is just an idea, my patches don't include this).
Alternatively eina_slstr can be implemented without a freeq, and keep the
freeq exclusively for a "safe" replacement to free().
Thoughts?
[1] tmpstr would have been better... synonyms to short-lived include
temporary, ephemeral, transient, fleeting, volatile...
--
Jean-Philippe André
------------------------------------------------------------------------------
Developer Access Program for Intel Xeon Phi Processors
Access to Intel Xeon Phi processor-based developer platforms.
With one year of Intel Parallel Studio XE.
Training and support from Colfax.
Order your platform today. http://sdm.link/xeonphi
_______________________________________________
enlightenment-devel mailing list
enlightenment-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/enlightenment-devel
