SC_HASH
#define SC_LOOKUP(wc) &sc_table[SC_HASH(wc)]
#define SC_LOOKUP(wc) &sleepq_chains[SC_HASH(wc)]
LIST_FOREACH(sp, &sleepq_hash[SC_HASH(wmesg)], sp_link)
LIST_INSERT_HEAD(&sleepq_hash[SC_HASH(wmesg)], sp, sp_link);