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