Heap usage during static allocation of memory in C6727 dsp

anushree mahapatra

Hi all,

My program is doing static allocation of memory all throughout and no dynamic allocation. Thus, for what will the heap be used in my program? In the memory map it shows that the memory.obj file of run-time support library is allocated there. What does that mean? I dont see heap usage anywhere significant here. Thus my heap is at a minimum size of 500 currently. I am not using DSP/BIOS.

Help appreciated.

Thanks.

Anushree

over 14 years ago

0 Douglas Gwyn over 14 years ago

Expert 2210 points

If you invoke fopen, for example, it is likely that the run-time support library will allocate a buffer from the heap. Generally, if a library function does not maintain state, it is unlikely to use heap storage.

0 anushree mahapatra over 14 years ago in reply to Douglas Gwyn

Intellectual 360 points

Hi Douglas,

Could you specify what exactly do you mean by library function not maintaining state? By state i understand it does not have to store any data in memory which shall be reuqired by another function.

Anushree

0 RandyP over 14 years ago in reply to anushree mahapatra

TI__Guru* 84110 points

Anushree,

As I recall, printf uses the heap.

The memory.obj module is where the heap-support functions are written.

What happens if you set the heap size to 0? I would expect printf to fail, but maybe you do not use printf.

Regards,
RandyP

0 anushree mahapatra over 14 years ago in reply to RandyP

Intellectual 360 points

Hi Randy,

Yes I had noticed that heap was always taken up by memory.obj module on the map file. There were several fprintf statements written in the legacy code for debugging purposes and now the heap is completely uninitialised and does not get used at all. Still i have given heap as 100 as the minimum size to be used.

Thank you so much for the help.

Regards,

Anushree

0 RandyP over 14 years ago in reply to anushree mahapatra

TI__Guru* 84110 points

Anushree,

If your question is resolved, please mark the post that will be most helpful to another reader. Mark it by clicking the green button saying it was answered.

Regards,
RandyP

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Heap usage during static allocation of memory in C6727 dsp