[lwip-devel] [task #6863] Create option to use different size pools (using memp) instead of heap

[Simon Goldschmidt]

Follow-up Comment #1, task #6863 (project lwip):

I've finally managed to create a mem.c implementation that uses memp pools.
The challenge I faced (am still facing in fact) is the following:

Initially, I wanted to have configuration options like this:

#define MEM_USE_POOLS              1
#define MEM_POOL_COUNT             3
#define MEM_POOL_SIZE              64,500,1500
#define MEM_POOL_NUM               100,20,10

But does anyone know how I then can calculate the size of each pool using the
preprocessor??? To create the memp_memory, I would have to calculate 63*100,
500*20, 1500*10 using the preprocessor. Since I really don't know how to do
that, I changed the defines to this:

#define MEM_USE_POOLS              1
#define MEM_POOL_COUNT             3
#define MEM_POOL_SIZE_1            64
#define MEM_POOL_NUM_1             100
#define MEM_POOL_SIZE_2            500
#define MEM_POOL_NUM_2             20
#define MEM_POOL_SIZE_3            1500
#define MEM_POOL_NUM_3             10

By doing it that way, I get many lines like '#if MEM_POOL_COUNT > X' in the
memp code.

That's very bad code but it's still working and way faster than the normal
heap.

I'll check it in (as default off -> using the normal heap) these days if
noone comes up with a better solution!

(file #13016)
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Additional Item Attachment:

File name: mem_pools.patch                Size:7 KB


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