The Resource Manager Reference says:
The Resource Manager keeps track of resources in memory and provides functions for the proper management of the resource chain.
Is there a way to inspect the resource chain from GDB- to print it's current state, etc.? If so, how?
Eric Schlegel answered the question on the Carbon-Dev mailing list in this message
It was:
(gdb) call (void)PrintResourceChain(0)
The parameter should be 0 or 1: 0 for walking the resource map data structures directly, 1 for using API to walk the resource chain.
He also notes that it may not be documented anywhere.