Question

We are creating a Real-Time Process in VxWorks 6.x, and we would like to limit the amount of memory which can be allocated to the heap. How do we do this?

Answer 1

When creating a RTP via rtpSpawn(), you can specify an environment variable which controls how the heap behaves.
There are 3 environment variables:

 HEAP_INITIAL_SIZE - How much heap to allocate initially (defaults to 64K)   HEAP_MAX_SIZE     - Maximum heap to allocate (defaults to no limit) HEAP_INCR_SIZE    - memory increment when adding to RTP heap (defaults to 1 virtual page)  The following code shows how to use the environment variables:     char * envp[] = {'HEAP_INITIAL_SIZE=0x20000', 'HEAP_MAX_SIZE=0x100000', NULL);    rtpSpawn ('myrtp.vxe', NULL, envp, 100, 0x10000, 0, 0);