/******************************************************************************
**函数名称: ring_mpop
**功 能: 同时弹出多个数据
**输入参数:
** rq: 队列
** num: 弹出n个地址
**输出参数:
** addr: 指针数组
**返 回: 数据实际条数
**实现描述: 无锁编程
**注意事项:
**作 者: # Qifeng.zou # 2015.05.05 #
******************************************************************************/
int ring_mpop(ring_t *rq, void **addr, unsigned int num)
{
int succ;
unsigned int cons_head, cons_next, prod_tail, i;
/* > 申请队列空间 */
do {
cons_head = rq->cons.head;
prod_tail = rq->prod.tail;
if (num > prod_tail - cons_head) {
return 0; /* 无数据 */
}
cons_next = cons_head + num;
succ = atomic32_cmp_and_set(&rq->cons.head, cons_head, cons_next);
} while(0 == succ);
/* > 地址弹出队列 */
for (i=0; i<num; ++i) {
addr[i] = (void *)rq->data[(cons_head+i) & rq->mask];
}
/* > 判断是否其他线程也在进行处理, 是的话, 则等待对方完成处理 */
while (rq->cons.tail != cons_head) { NULL; }
rq->cons.tail = cons_next;
atomic32_sub(&rq->num, num); /* 计数 */
return num;
}
inline int pkt_fifo_get(pkt_fifo_t *fifo, pkt_node_t *node)
{
uint32_t out;
uint32_t size;
uint32_t count;
pkt_buf_t *pkt;
if (fifo == NULL || node == NULL) {
applog(APP_LOG_LEVEL_DEBUG, APP_VPU_LOG_MASK_WORKER, "pkt_fifo_get fifo: %p, node: %p", fifo, node);
return -1; //no data in fifo
}
out = fifo->out;
size = fifo->size;
count = atomic32_read(&fifo->count);
pkt = fifo->pkt;
if (count <= 0) {
return -2;
}
if (unlikely(out >= size)) {
applog(APP_LOG_LEVEL_DEBUG, APP_VPU_LOG_MASK_WORKER, "pkt_fifo_get out: %u, size: %u", out, size);
return -3;
}
node->pkt = pkt[out].pkt;
node->pkt_len = pkt[out].pkt_len;
atomic32_sub(&fifo->count, 1);
out = out + 1;
if (unlikely(out >= size)) {
out = 0;
}
fifo->out = out;
return 0;
}
