Move (macro)

For double ring,jump n nodes back or force.

o m_dring_move
nring
o m_ndring_move
ndring
For double ring,jump n nodes back or force.
Throws:
ELOOP Move made a complete loop
EMLINK null pointer found in ring link.
Parameters:
p_ring - (IN) a pointer to your structure node
hops - (IN) Number of jumps.
check - (IN) if true, a loop detection.
field - (IN) the ring structure field name in the node structure.
Returns:
0 the ring is empty, or the previous node in the ring.

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