FreeRTOS and C++ STL compatability

Kernel
1

sinakahnemouyi1 wrote on Tuesday, September 16, 2014:

Hi,

I was wondering if FreeRTOS is compatible with C++ STL (containers such as list, vector). FreeRTOS tasks use thread safe allocators, however STLs use simple malloc, and free functions. Is there anyway to make this work?

Thanks

2

edwards3 wrote on Wednesday, September 17, 2014:

If you can redirect the compiler to a different malloc and free implementation (common with compilers, check the command options) then use heap_3.c and redirect malloc() to pvPortMalloc() and free() to vPortFree(). That will take care of the memory allocation, not sure about the rest.

3

sinakahnemouyi1 wrote on Thursday, September 18, 2014:

Thank you MEdwards. I am using Kinetis Design Studio which is an Eclipse based IDE and I was able to enable multiple definitions in the compiler by adding the following flag to the C/C++ linker:
-z muldefs

This allowed me to override the malloc and free functions for FreeRTOS and solved the problem. This can be done in the main.c file:

extern void malloc(size_t size);
extern void free (void ptr);

void *malloc(size_t size)
{
void *result;

result = FRTOS1_pvPortMalloc(size);

return result;

}

void free (void* ptr){
FRTOS1_vPortFree(ptr);
}

Best,
Sina

4

rtel wrote on Thursday, September 18, 2014:

Maybe just where you have types the code in here, but note the prototype of the malloc() function you posted is not correct. It needs to return a void *, not just a void. I imagine this is correct in your real code otherwise the compiler would complain.

Regards.