rem: void insert_into_hash_table(struct s_table *hash_table,  struct cell * p_cell)
add: void insert_into_hash_table( struct cell * p_cell)
context: void insert_into_hash_table(struct s_table *hash_table,  struct cell * p_cell){	LOCK_HASH(p_cell->hash_index);	insert_into_hash_table_unsafe( hash_table,  p_cell );	UNLOCK_HASH(p_cell->hash_index);}