RTEMS C User's Guide
A partition is a physically contiguous memory area divided into fixed-size buffers that can be dynamically allocated and deallocated.
Partitions are managed and maintained as a list of buffers. Buffers are obtained from the front of the partition's free buffer chain and returned to the rear of the same chain. When a buffer is on the free buffer chain, RTEMS uses two pointers of memory from each buffer as the free buffer chain. When a buffer is allocated, the entire buffer is available for application use. Therefore, modifying memory that is outside of an allocated buffer could destroy the free buffer chain or the contents of an adjacent allocated buffer.
RTEMS C User's Guide
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