From 07363a45fe4a7fe693acf438f0b56f927bdd3fbd Mon Sep 17 00:00:00 2001 From: Jakub Grajciar Date: Thu, 2 Apr 2020 10:02:17 +0200 Subject: gomemif: introduce gomemif golang native memif driver Type: feature Signed-off-by: Jakub Grajciar Change-Id: I693156a44011c80025245d25134f5bf5db6eba82 Signed-off-by: Jakub Grajciar --- extras/gomemif/memif/memif_unsafe.go | 55 ++++++++++++++++++++++++++++++++++++ 1 file changed, 55 insertions(+) create mode 100644 extras/gomemif/memif/memif_unsafe.go (limited to 'extras/gomemif/memif/memif_unsafe.go') diff --git a/extras/gomemif/memif/memif_unsafe.go b/extras/gomemif/memif/memif_unsafe.go new file mode 100644 index 00000000000..4469d26e982 --- /dev/null +++ b/extras/gomemif/memif/memif_unsafe.go @@ -0,0 +1,55 @@ +/* + *------------------------------------------------------------------ + * 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]))) +} -- cgit 1.2.3-korg