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64 lines
1.8 KiB
64 lines
1.8 KiB
// Copyright 2020 PingCAP, Inc.
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//
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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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// See the License for the specific language governing permissions and
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// limitations under the License.
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package localpool
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import (
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"runtime"
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_ "unsafe" // required by go:linkname
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)
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// LocalPool is an thread local object pool.
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// It's similar to sync.Pool but has some difference
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// - It can define the size of the pool.
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// - It never get GCed.
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type LocalPool struct {
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sizePerProc int
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slots []*slot
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newFn func() interface{}
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resetFn func(obj interface{})
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}
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type slot struct {
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objs []interface{}
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getHit int
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getMiss int
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putHit int
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putMiss int
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}
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// NewLocalPool creates a pool.
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// The sizePerProc is pool size for each PROC, so total pool size is (GOMAXPROCS * sizePerProc)
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// It can only be used when the GOMAXPROCS never change after the pool created.
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// newFn is the function to create a new object.
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// resetFn is the function called before put back to the pool, it can be nil.
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func NewLocalPool(sizePerProc int, newFn func() interface{}, resetFn func(obj interface{})) *LocalPool {
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slots := make([]*slot, runtime.GOMAXPROCS(0))
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for i := 0; i < len(slots); i++ {
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slots[i] = &slot{
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objs: make([]interface{}, 0, sizePerProc),
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}
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}
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return &LocalPool{
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sizePerProc: sizePerProc,
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slots: slots,
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newFn: newFn,
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resetFn: resetFn,
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}
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}
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//go:linkname procPin runtime.procPin
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func procPin() int
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//go:linkname procUnpin runtime.procUnpin
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func procUnpin() int
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