Lines Matching refs:tail
86 rbuf->tail = 0;
127 if (rbuf->head != rbuf->tail) {
209 if (((pos + 1) & rbuf->lim) != rbuf->tail) {
242 if (rbuf->head != rbuf->tail) {
243 pos = rbuf->tail;
244 rbuf->tail = (pos + 1) & rbuf->lim;
274 int tail;
278 tail = rbuf->tail;
280 if (head == tail)
282 if (head > tail)
283 return (head - tail);
285 return ((rbuf->lim + 1 - tail + head));