RTEMS C User's Guide
The Chains API maps to the Super Core Chains API. Chains are implemented as a double linked list of nodes anchored to a control node. The list starts at the control node and is terminated at the control node. A node has previous and next pointers. Being a double linked list nodes can be inserted and removed without the need to travse the chain.
Chains have a small memory footprint and can be used in interrupt service routines and are thread safe in a multi-threaded environment. The directives list which operations disable interrupts.
Chains are very useful in Board Support packages and applications.
RTEMS C User's Guide
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