this allows environment variables to set the byte falue to fill a
freeq item added to the queue and then another item to actually fill
memory with just before the free function so memory content difference
will tell you if its inside the free queue or already freed from it
completely. if you set tyhe freed value to 0 this will not fill with a
value just before free and leave the value as-is determined by the
first fill pattern value.
this will make a freeq bypass that is enabled by using valgrind or env
var not affect a freeq that has manually changed its queue count max
or mem max. these now become explicit deferred freeers.
this adds eina_freeq api's for c land for deferring freeing of
pointers and can be used a s a simple copy & paste drop-in for free()
just to "do this later". the pointer will eveentually be freed as
eina_shutdown will free the main free queue and this will in turn free
everything in it. as long as the main lo0op keeps pumping things will
og on the queue and then be freed from it. free queues have limits so
if they get full they will clear out old pointers and free them so it
won't grow without bound. the default max is 1mb of data or 16384
items whichever limit is hit first and at that point the oldest item
will be freed to make room for the newest. the mainloop whenever it
finishes idle enterers will add an idler to spin and free while idle.
the sizes can be tuned and aruged about as to what defaults should be.
this also allows for better memory debugging too by being able to fill
freed memory with patterns if its small enough etc. etc.
@feature
Carsten Haitzler