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/*
* Copyright (C) NGINX, Inc.
*/
#ifndef _NXT_APP_QUEUE_H_INCLUDED_
#define _NXT_APP_QUEUE_H_INCLUDED_
#include <nxt_app_nncq.h>
/* Using Numeric Naive Circular Queue as a backend. */
#define NXT_APP_QUEUE_SIZE NXT_APP_NNCQ_SIZE
#define NXT_APP_QUEUE_MSG_SIZE 31
typedef struct {
uint8_t size;
uint8_t data[NXT_APP_QUEUE_MSG_SIZE];
uint32_t tracking;
} nxt_app_queue_item_t;
typedef struct {
nxt_app_nncq_atomic_t notified;
nxt_app_nncq_t free_items;
nxt_app_nncq_t queue;
nxt_app_queue_item_t items[NXT_APP_QUEUE_SIZE];
} nxt_app_queue_t;
nxt_inline void
nxt_app_queue_init(nxt_app_queue_t volatile *q)
{
nxt_app_nncq_atomic_t i;
nxt_app_nncq_init(&q->free_items);
nxt_app_nncq_init(&q->queue);
for (i = 0; i < NXT_APP_QUEUE_SIZE; i++) {
nxt_app_nncq_enqueue(&q->free_items, i);
}
q->notified = 0;
}
nxt_inline nxt_int_t
nxt_app_queue_send(nxt_app_queue_t volatile *q, const void *p,
uint8_t size, uint32_t tracking, int *notify, uint32_t *cookie)
{
int n;
nxt_app_queue_item_t *qi;
nxt_app_nncq_atomic_t i;
i = nxt_app_nncq_dequeue(&q->free_items);
if (i == nxt_app_nncq_empty(&q->free_items)) {
return NXT_AGAIN;
}
qi = (nxt_app_queue_item_t *) &q->items[i];
qi->size = size;
nxt_memcpy(qi->data, p, size);
qi->tracking = tracking;
*cookie = i;
nxt_app_nncq_enqueue(&q->queue, i);
n = nxt_atomic_cmp_set(&q->notified, 0, 1);
if (notify != NULL) {
*notify = n;
}
return NXT_OK;
}
nxt_inline void
nxt_app_queue_notification_received(nxt_app_queue_t volatile *q)
{
q->notified = 0;
}
nxt_inline nxt_bool_t
nxt_app_queue_cancel(nxt_app_queue_t volatile *q, uint32_t cookie,
uint32_t tracking)
{
nxt_app_queue_item_t *qi;
qi = (nxt_app_queue_item_t *) &q->items[cookie];
return nxt_atomic_cmp_set(&qi->tracking, tracking, 0);
}
nxt_inline ssize_t
nxt_app_queue_recv(nxt_app_queue_t volatile *q, void *p, uint32_t *cookie)
{
ssize_t res;
nxt_app_queue_item_t *qi;
nxt_app_nncq_atomic_t i;
i = nxt_app_nncq_dequeue(&q->queue);
if (i == nxt_app_nncq_empty(&q->queue)) {
*cookie = 0;
return -1;
}
qi = (nxt_app_queue_item_t *) &q->items[i];
res = qi->size;
nxt_memcpy(p, qi->data, qi->size);
*cookie = i;
nxt_app_nncq_enqueue(&q->free_items, i);
return res;
}
#endif /* _NXT_APP_QUEUE_H_INCLUDED_ */
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