DseWiki: MarkusRechberger/C/Obstack

Veränderung (letzte Änderung) (keine anderen Diffs, Normalansicht)

Verändert: 1c1,32

Beschreibe hier die neue Seite.

== Obstack ==

[[Code]

> hmm what's the advantage of using the obstack_* functions? isn't
> malloc already enough? never saw it in an application actually so I'm
> just curious about it..
>
> thanks
> Markus
]

[[Code]
Actually I was asking myself the exact same thing after I read that the
GCC compiler uses this memory allocation strategy. If you google for
obstack you will find a lot of programs using the obstack libs.

From what I understand upon till now, and please correct me if I am wrong:
obstack is a data stack that is used to create pooled memory allocation.
Memory allocation and deallocation, is said to be much faster because it's
done a pool at a time. Error-handling pools can be preallocated so that
programs can make good recovery's if no more regular memory is available.
The lifespan of a memory pool can be crontrolled like the way the apache
webserver does e.g. `Apache Portable Runtime'.

For me personally I don't think I will use this strategy's because I
simply don't need it, but it is still interesting to look into it
because it requires me to actually think about how memory allocation works
and what the options are.

J.
]

Obstack

> hmm what's the advantage of using the obstack_* functions? isn't > malloc already enough? never saw it in an application actually so I'm > just curious about it.. > > thanks > Markus

Actually I was asking myself the exact same thing after I read that the GCC compiler uses this memory allocation strategy. If you google for obstack you will find a lot of programs using the obstack libs. From what I understand upon till now, and please correct me if I am wrong: obstack is a data stack that is used to create pooled memory allocation. Memory allocation and deallocation, is said to be much faster because it's done a pool at a time. Error-handling pools can be preallocated so that programs can make good recovery's if no more regular memory is available. The lifespan of a memory pool can be crontrolled like the way the apache webserver does e.g. `Apache Portable Runtime'. For me personally I don't think I will use this strategy's because I simply don't need it, but it is still interesting to look into it because it requires me to actually think about how memory allocation works and what the options are. J.