take a look at the 4-th parameter of rt_pipe_create() :
@param poolsize Specifies the size of a dedicated buffer pool for the
* pipe. Passing 0 means that all message allocations for this pipe are
* performed on the system heap.
The system heap is also used for other allocations and not only to serve a given heap. It's default size is 128 Kb (configurable through the config though).
Passing non-zero parameter causes a private heap of the given size to be created for this heap.
Note, it's a size in bytes, not a flag (in your example you use 1 for the second heap).
This value is rounded up to a page size.
if (poolsize < 2 * PAGE_SIZE)
poolsize = 2 * PAGE_SIZE;
poolsize = xnheap_rounded_size(poolsize, PAGE_SIZE);
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