RE: [lwip-users] Using MEM_LIBC_MALLOC == 1 in an OS

[Edward Harris]

Thanks for that.

I do use heap_3.c, as I only have a small amount of RAM and so need to
allocate just one heap.

I suspect that I should add mem_free() mem_malloc() etc. macros to
lwipopts that map to the FreeRTOS protected versions (pvPortMalloc() and
vPortFree()).

Can anyone advise on SYS_LIGHTWEIGHT_PROT, please?

Thanks,

Edward Harris
Cyan Technology

-----Original Message-----
From: address@hidden
[mailto:address@hidden
On Behalf Of FreeRTOS.org Info
Sent: 26 February 2009 10:39
To: 'Mailing list for lwIP users'
Subject: RE: [lwip-users] Using MEM_LIBC_MALLOC == 1 in an OS

> -----Original Message-----
> From: address@hidden
> [mailto:address@hidden On Behalf 
> Of Edward Harris
> Sent: 26 February 2009 10:03
> To: Mailing list for lwIP users
> Subject: [lwip-users] Using MEM_LIBC_MALLOC == 1 in an OS
> 
> Hello all.
> 
> I have just spotted a possible issue in the LwIP port that I am 
> working with under an OS (FreeRTOS).
> 
> The issue is that I have set MEM_LIBC_MALLOC = 1, to use the standard 
> C
> malloc() and free(), however as I'm using an OS, should I redirect the
> mem_xxx() macros to the OS protected versions?
> 
> Also, can someone clarify the use of SYS_LIGHTWEIGHT_PROT, should I 
> have it set to 1?
> 


This does not answer the question directly, but in FreeRTOS if you
include heap_3.c in your project then the FreeRTOS heap calls just use
the standard malloc too - but protected by a critical region (actually a
scheduler lock so interrupts remain enabled).  It would then seem to
make sense for the lwIP calls to use the same functions.

Regards,
Richard.

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