datastructure for LIFO

[wenhuizhang]

Hi, to whom it may concern:

I don't understand why LIFO and FIFO are all initialized with a queue please?
It seems like operation changes when LIFO, it uses prepend, and when FIFO it uses append.
This makes the logic correct, however the names are little confusing.

zephyr/include/kernel.h

Line 1937 in 2251ea0

struct k_lifo {

struct k_lifo {
	struct k_queue _queue;
};

#define _K_LIFO_INITIALIZER(obj) \
	{ \
	._queue = _K_QUEUE_INITIALIZER(obj._queue) \
	}

#define K_LIFO_INITIALIZER DEPRECATED_MACRO _K_LIFO_INITIALIZER

[nashif]

@Vudentz can you please look into this, AFAIK you made changes in this area.

[Vudentz]

Well they both are using a queue as storage for the items, in fact both k_fifo and k_lifo could be replaced by k_queue, but initially lifo and fifo did not share a common storage so there was a lot of code duplication.