I want to know what malloc() do in Linux.
Some books say malloc() will call brk() and mmap()
I have tried to find the the source code of malloc() in glibc.
But it seems the code I find in glibc is not for Linux, and it doesn't
call brk() and mmap().
Could any one give me the source code of malloc() for Linux?
Thank you.

[ Post a follow-up to this message ]

"Zheng Da" <zhengda1936@gmail.com> writes:

> I want to know what malloc() do in Linux.
> Some books say malloc() will call brk() and mmap()
> I have tried to find the the source code of malloc() in glibc.
> But it seems the code I find in glibc is not for Linux, and it doesn't
> call brk() and mmap().
> Could any one give me the source code of malloc() for Linux?

It's in glibc and it does call both brk/sbrk and mmap.

--
Måns Rullgård
mru@inprovide.com

[ Post a follow-up to this message ]

Måns Rullgård <mru@inprovide.com> writes:
 

What source file(s) are you looking at?
[vbcol=seagreen]
> It's in glibc ...

More precisely, it's in malloc/malloc.c; start with the
public_mALLOc() function.

Cheers,
--
In order to understand recursion you must first understand recursion.
Remove /-nsp/ for email.

[ Post a follow-up to this message ]

I find it now.
Thank you
I just search malloc in sourceinsight, so I didn't get the right one.
The public_mALLOc() seems very complex, must more complex than I thought

[ Post a follow-up to this message ]

On Sun, 19 Jun 2005 23:32:03 -0700, Zheng Da wrote:

> The public_mALLOc() seems very complex, must more complex than I thought

If you want an example of a very simple allocator look at the malloc
implementation in Plauger's _The Standard C Library_.

I've also written a simple circular linked list of cells type of allocator
[1] although it doesn't call sbrk or mmap because it sub-allocates memor
y
from a larger chunk privided by the user when the allocator is initialized.

Mike

[1] http://www.ioplex.com/~miallen/libmba/dl/src/suba.c

[ Post a follow-up to this message ]

Zheng Da wrote:
> I find it now.
> Thank you
> I just search malloc in sourceinsight, so I didn't get the right one.
> The public_mALLOc() seems very complex, must more complex than I thought

If you want to see a simple memory manager, see my article on memory
management:

http://www-128.ibm.com/developerwor...brary/l-memory/

It also goes through other aspects of memory management.  You can find
an assembly language version of the allocator in my book listed in my
signature.

Jon
----
Learn to program using Linux assembly language
http://www.cafeshops.com/bartlettpublish.8640017

[ Post a follow-up to this message ]