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/*
*------------------------------------------------------------------
* Copyright (c) 2020 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*------------------------------------------------------------------
*/
package memif
import (
"unsafe"
)
// readHead reads ring head directly form the shared memory
func (q *Queue) readHead() (head int) {
return (int)(*(*uint16)(unsafe.Pointer(&q.i.regions[q.ring.region].data[q.ring.offset+ringHeadOffset])))
// return atomicload16(&q.i.regions[q.region].data[q.offset + descHeadOffset])
}
// readTail reads ring tail directly form the shared memory
func (q *Queue) readTail() (tail int) {
return (int)(*(*uint16)(unsafe.Pointer(&q.i.regions[q.ring.region].data[q.ring.offset+ringTailOffset])))
// return atomicload16(&q.i.regions[q.region].data[q.offset + descTailOffset])
}
// writeHead writes ring head directly to the shared memory
func (q *Queue) writeHead(value int) {
*(*uint16)(unsafe.Pointer(&q.i.regions[q.ring.region].data[q.ring.offset+ringHeadOffset])) = *(*uint16)(unsafe.Pointer(&value))
//atomicstore16(&q.i.regions[q.region].data[q.offset + descHeadOffset], value)
}
// writeTail writes ring tail directly to the shared memory
func (q *Queue) writeTail(value int) {
*(*uint16)(unsafe.Pointer(&q.i.regions[q.ring.region].data[q.ring.offset+ringTailOffset])) = *(*uint16)(unsafe.Pointer(&value))
//atomicstore16(&q.i.regions[q.region].data[q.offset + descTailOffset], value)
}
func (q *Queue) setDescLength(slot int, length int) {
*(*uint16)(unsafe.Pointer(&q.i.regions[q.ring.region].data[q.ring.offset+ringSize+slot*descSize+descLengthOffset])) = *(*uint16)(unsafe.Pointer(&length))
}
// getFlags reads ring flags directly from the shared memory
func (q *Queue) getFlags() int {
return (int)(*(*uint16)(unsafe.Pointer(&q.i.regions[q.ring.region].data[q.ring.offset+ringFlagsOffset])))
}
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