103 lines
1.9 KiB
C
103 lines
1.9 KiB
C
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/*
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* Copyright (C) NGINX, Inc.
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*/
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#ifndef _NXT_PORT_QUEUE_H_INCLUDED_
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#define _NXT_PORT_QUEUE_H_INCLUDED_
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#include <nxt_nncq.h>
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/* Using Numeric Naive Circular Queue as a backend. */
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#define NXT_PORT_QUEUE_SIZE NXT_NNCQ_SIZE
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#define NXT_PORT_QUEUE_MSG_SIZE 31
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typedef struct {
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uint8_t size;
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uint8_t data[NXT_PORT_QUEUE_MSG_SIZE];
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} nxt_port_queue_item_t;
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typedef struct {
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nxt_nncq_atomic_t nitems;
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nxt_nncq_t free_items;
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nxt_nncq_t queue;
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nxt_port_queue_item_t items[NXT_PORT_QUEUE_SIZE];
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} nxt_port_queue_t;
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nxt_inline void
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nxt_port_queue_init(nxt_port_queue_t volatile *q)
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{
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nxt_nncq_atomic_t i;
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nxt_nncq_init(&q->free_items);
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nxt_nncq_init(&q->queue);
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for (i = 0; i < NXT_PORT_QUEUE_SIZE; i++) {
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nxt_nncq_enqueue(&q->free_items, i);
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}
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q->nitems = 0;
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}
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nxt_inline nxt_int_t
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nxt_port_queue_send(nxt_port_queue_t volatile *q, const void *p, uint8_t size,
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int *notify)
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{
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nxt_nncq_atomic_t i;
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nxt_port_queue_item_t *qi;
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i = nxt_nncq_dequeue(&q->free_items);
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if (i == nxt_nncq_empty(&q->free_items)) {
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*notify = 0;
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return NXT_AGAIN;
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}
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qi = (nxt_port_queue_item_t *) &q->items[i];
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qi->size = size;
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nxt_memcpy(qi->data, p, size);
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nxt_nncq_enqueue(&q->queue, i);
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i = nxt_atomic_fetch_add(&q->nitems, 1);
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*notify = (i == 0);
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return NXT_OK;
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}
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nxt_inline ssize_t
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nxt_port_queue_recv(nxt_port_queue_t volatile *q, void *p)
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{
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ssize_t res;
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nxt_nncq_atomic_t i;
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nxt_port_queue_item_t *qi;
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i = nxt_nncq_dequeue(&q->queue);
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if (i == nxt_nncq_empty(&q->queue)) {
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return -1;
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}
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qi = (nxt_port_queue_item_t *) &q->items[i];
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res = qi->size;
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nxt_memcpy(p, qi->data, qi->size);
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nxt_nncq_enqueue(&q->free_items, i);
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nxt_atomic_fetch_add(&q->nitems, -1);
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return res;
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}
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#endif /* _NXT_PORT_QUEUE_H_INCLUDED_ */
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