2 *------------------------------------------------------------------
3 * Copyright (c) 2020 Cisco and/or its affiliates.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 *------------------------------------------------------------------
24 // readHead reads ring head directly form the shared memory
25 func (q *Queue) readHead() (head int) {
26 return (int)(*(*uint16)(unsafe.Pointer(&q.i.regions[q.ring.region].data[q.ring.offset+ringHeadOffset])))
27 // return atomicload16(&q.i.regions[q.region].data[q.offset + descHeadOffset])
30 // readTail reads ring tail directly form the shared memory
31 func (q *Queue) readTail() (tail int) {
32 return (int)(*(*uint16)(unsafe.Pointer(&q.i.regions[q.ring.region].data[q.ring.offset+ringTailOffset])))
33 // return atomicload16(&q.i.regions[q.region].data[q.offset + descTailOffset])
36 // writeHead writes ring head directly to the shared memory
37 func (q *Queue) writeHead(value int) {
38 *(*uint16)(unsafe.Pointer(&q.i.regions[q.ring.region].data[q.ring.offset+ringHeadOffset])) = *(*uint16)(unsafe.Pointer(&value))
39 //atomicstore16(&q.i.regions[q.region].data[q.offset + descHeadOffset], value)
42 // writeTail writes ring tail directly to the shared memory
43 func (q *Queue) writeTail(value int) {
44 *(*uint16)(unsafe.Pointer(&q.i.regions[q.ring.region].data[q.ring.offset+ringTailOffset])) = *(*uint16)(unsafe.Pointer(&value))
45 //atomicstore16(&q.i.regions[q.region].data[q.offset + descTailOffset], value)
48 func (q *Queue) setDescLength(slot int, length int) {
49 *(*uint16)(unsafe.Pointer(&q.i.regions[q.ring.region].data[q.ring.offset+ringSize+slot*descSize+descLengthOffset])) = *(*uint16)(unsafe.Pointer(&length))
52 // getFlags reads ring flags directly from the shared memory
53 func (q *Queue) getFlags() int {
54 return (int)(*(*uint16)(unsafe.Pointer(&q.i.regions[q.ring.region].data[q.ring.offset+ringFlagsOffset])))