FreeRTOS and C++ STL compatability

sinakahnemouyi1 wrote on Tuesday, September 16, 2014:


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?


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.

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

void *malloc(size_t size)
void *result;

result = FRTOS1_pvPortMalloc(size);

return result;


void free (void* ptr){


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.