07363a45fe
golang native memif driver Type: feature Signed-off-by: Jakub Grajciar <jgrajcia@cisco.com> Change-Id: I693156a44011c80025245d25134f5bf5db6eba82 Signed-off-by: Jakub Grajciar <jgrajcia@cisco.com>
56 lines
2.3 KiB
Go
56 lines
2.3 KiB
Go
/*
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*------------------------------------------------------------------
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* Copyright (c) 2020 Cisco and/or its affiliates.
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*------------------------------------------------------------------
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*/
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package memif
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import (
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"unsafe"
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)
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// readHead reads ring head directly form the shared memory
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func (q *Queue) readHead() (head int) {
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return (int)(*(*uint16)(unsafe.Pointer(&q.i.regions[q.ring.region].data[q.ring.offset+ringHeadOffset])))
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// return atomicload16(&q.i.regions[q.region].data[q.offset + descHeadOffset])
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}
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// readTail reads ring tail directly form the shared memory
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func (q *Queue) readTail() (tail int) {
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return (int)(*(*uint16)(unsafe.Pointer(&q.i.regions[q.ring.region].data[q.ring.offset+ringTailOffset])))
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// return atomicload16(&q.i.regions[q.region].data[q.offset + descTailOffset])
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}
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// writeHead writes ring head directly to the shared memory
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func (q *Queue) writeHead(value int) {
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*(*uint16)(unsafe.Pointer(&q.i.regions[q.ring.region].data[q.ring.offset+ringHeadOffset])) = *(*uint16)(unsafe.Pointer(&value))
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//atomicstore16(&q.i.regions[q.region].data[q.offset + descHeadOffset], value)
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}
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// writeTail writes ring tail directly to the shared memory
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func (q *Queue) writeTail(value int) {
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*(*uint16)(unsafe.Pointer(&q.i.regions[q.ring.region].data[q.ring.offset+ringTailOffset])) = *(*uint16)(unsafe.Pointer(&value))
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//atomicstore16(&q.i.regions[q.region].data[q.offset + descTailOffset], value)
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}
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func (q *Queue) setDescLength(slot int, length int) {
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*(*uint16)(unsafe.Pointer(&q.i.regions[q.ring.region].data[q.ring.offset+ringSize+slot*descSize+descLengthOffset])) = *(*uint16)(unsafe.Pointer(&length))
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}
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// getFlags reads ring flags directly from the shared memory
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func (q *Queue) getFlags() int {
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return (int)(*(*uint16)(unsafe.Pointer(&q.i.regions[q.ring.region].data[q.ring.offset+ringFlagsOffset])))
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}
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