Function ngx_queue_split 

pub unsafe fn ngx_queue_split(
    h: *mut ngx_queue_t,
    q: *mut ngx_queue_t,
    n: *mut ngx_queue_t,
)

Splits a queue at a node, returning the queue tail in a separate queue.

Safety

h must be a valid pointer to a head queue node. q must be a node in the queue h. n must be a valid pointer to [ngx_queue_t].