Re: Memory pools -- support for moving a sub-pool from one pool t o an other

[Ben Laurie <be...@algroup.co.uk>]

Sander Striker wrote:
>>We actually have two functions in our code:
>>moveTree(srcPool, dstPool) and moveItem(srcItem, dstPool). The moveItem()
>>takes an allocated buffer and binds it as a child of the dstPool. I
>>understand that this may have to be implemented by first allocating a buffer
>>--say dstItem-- of size srcItem in the dstPool and then doing a copy and
>>then freeing the srcItem. Does APR allow me to find out the size of the
>>srcItem if I just have the srcItem pointer.
> 
> No.  The memory returned by apr_palloc doesn't have any recorded size associated
> with it.  The only thing you might be able to deduce is the size of the containing
> block of memory.  But that may be a LOT larger than what you are looking for.
> Also, the concept of 'freeing the srcItem' isn't possible.  There is no
> apr_pfree function.

Of course, you could replace apr_palloc with a version that did record 
the size.

Cheers,

Ben.

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