Re: [ECOS] TCP/IP Stack for eCos

["Fernando D. Mato Mira" <matomira@iname.com>]

At 05:54 PM 4/27/99 +0700, you wrote:
>On Tue, 27 Apr 1999 11:07:53 -0700, Fred Fierling wrote:
>
>>A TCP stack that doesn't use malloc? Interesting. Do
>>you forbid malloc to avoid problems like memory
>>leaks, to guarantee response time, or why?
>
>Perhaps to help in provability? (Ie. guaranteeing the system is valid.)
>I expect you could still use buffer pools, instead of a single generic
>malloc that handles allocations for all types. In C++ you could use a
>class-specific operator new and a private heap for each type.

Deterministic response time. 

Some platforms that we use lack C++ compilers (eg, Analog Devices' SHARC DSP) .
In addiion to that, we could be restricted
to 544 Kbits of RAM (so the maximum program size would be 8K words of
48-bit instructions (leaving aside 8K 40-bit words for data)). That's a $10 DSP.
We just used the non-low-power version where we had the luxury of 1Mbit SRAM
inside. Among several other things, we had networking in it (custom, not IP).




Fernando D. Mato Mira                                                        
Real-Time SW Engineering & Networking
Advanced Systems Engineering Division                                                               
CSEM - Centre Suisse d'Electronique et de Microtechnique 
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