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refactor: agents to use the same task interface, increase channel siz…
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,73 @@ | ||
| /* | ||
| Copyright 2018 Banco Bilbao Vizcaya Argentaria, S.A. | ||
| 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 gossip | ||
|
|
||
| import ( | ||
| "runtime" | ||
| "sync/atomic" | ||
|
|
||
| "github.com/bbva/qed/protocol" | ||
| ) | ||
|
|
||
| const queueSize uint64 = 65535 | ||
|
|
||
| // Masking is faster than division | ||
| const indexMask uint64 = queueSize - 1 | ||
|
|
||
| type Queue struct { | ||
| // The padding members 1 to 5 below are here to ensure each item is on a separate cache line. | ||
| // This prevents false sharing and hence improves performance. | ||
| padding1 [8]uint64 | ||
| lastCommittedIndex uint64 | ||
| padding2 [8]uint64 | ||
| nextFreeIndex uint64 | ||
| padding3 [8]uint64 | ||
| readerIndex uint64 | ||
| padding4 [8]uint64 | ||
| contents [queueSize]*protocol.BatchSnapshots | ||
| padding5 [8]uint64 | ||
| } | ||
|
|
||
| func NewQueue() *Queue { | ||
| return &Queue{ | ||
| lastCommittedIndex: 0, | ||
| nextFreeIndex: 1, | ||
| readerIndex: 1, | ||
| } | ||
| } | ||
|
|
||
| func (self *Queue) Write(value *protocol.BatchSnapshots) { | ||
| var myIndex = atomic.AddUint64(&self.nextFreeIndex, 1) - 1 | ||
| //Wait for reader to catch up, so we don't clobber a slot which it is (or will be) reading | ||
| for myIndex > (self.readerIndex + queueSize - 2) { | ||
| runtime.Gosched() | ||
| } | ||
| //Write the item into it's slot | ||
| self.contents[myIndex&indexMask] = value | ||
| //Increment the lastCommittedIndex so the item is available for reading | ||
| for !atomic.CompareAndSwapUint64(&self.lastCommittedIndex, myIndex-1, myIndex) { | ||
| runtime.Gosched() | ||
| } | ||
| } | ||
|
|
||
| func (self *Queue) Read() *protocol.BatchSnapshots { | ||
| var myIndex = atomic.AddUint64(&self.readerIndex, 1) - 1 | ||
| //If reader has out-run writer, wait for a value to be committed | ||
| for myIndex > self.lastCommittedIndex { | ||
| runtime.Gosched() | ||
| } | ||
| return self.contents[myIndex&indexMask] | ||
| } |