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php

zend_mm_set_heap()

php.internals

Brian Shire

19 years ago

It seems like zend_mm_set_heap() isn't very useful outside
zend_alloc.c because the zend_mm_heap structure definition is within
the zend_alloc.c file rather than zend_alloc.h.  Could we move the AG
() and associated structures to the header file, or perhaps I missed
something?

- Shire
shire@facebook.com
shire@php.net

Dmitry Stogov

19 years ago

You probably missed.
This function can be used to substitute main PHP heap, so all emalloc()
function will work with new one.

Thanks. Dmitry.

Brian Shire

19 years ago

Thanks Dmitry,

I think what I was going for (in a very poorly worded way) was that
I'm unable to access any of the heap structure values outside of
zend_alloc.c because that's where the definition resides.

For example something like the following should generate a compile
time error outside zend_alloc.c:

zend_mm_heap *heap;
heap->overflow=0;

I've attached a rough patch of what I did to make this accessible
outside zend_alloc.c.

-shire

Dmitry Stogov

19 years ago

You are not allowed to touch zend_mm internals, but you don't need to do it.
Zend_alloc.c encapsulate all internals structures so it can be
changed/improved/fixed without binary compatibility break.
This is one of advantages of new memory manager.

BTW it allows replace storage backend (see zend_mm_startup_ex()), and usage
of several heaps with provided API (without access to internals).

Dmitry.