#ifndef MM_MSG_CACHE_H
#define MM_MSG_CACHE_H

/*
 * machinarium.
 *
 * cooperative multitasking engine.
 */

typedef struct mm_msgcache mm_msgcache_t;

struct mm_msgcache {
	mm_list_t list;
	uint64_t count;
	uint64_t count_allocated;
	uint64_t count_gc;
	uint64_t size;
	int gc_watermark;
};

void mm_msgcache_init(mm_msgcache_t *);
void mm_msgcache_free(mm_msgcache_t *);
void mm_msgcache_stat(mm_msgcache_t *, uint64_t *, uint64_t *, uint64_t *,
		      uint64_t *);

mm_msg_t *mm_msgcache_pop(mm_msgcache_t *);

void mm_msgcache_push(mm_msgcache_t *, mm_msg_t *);

static inline void mm_msgcache_set_gc_watermark(mm_msgcache_t *cache, int wm)
{
	cache->gc_watermark = wm;
}

static inline void mm_msg_ref(mm_msg_t *msg)
{
	msg->refs++;
}

static inline void mm_msg_unref(mm_msgcache_t *cache, mm_msg_t *msg)
{
	if (msg->refs > 0) {
		msg->refs--;
		return;
	}
	mm_msgcache_push(cache, msg);
}

#endif /* MM_MSG_CACHE_H */