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57 lines
1.2 KiB
57 lines
1.2 KiB
package bytespool
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import "sync"
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func createAllocFunc(size int32) func() interface{} {
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return func() interface{} {
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return make([]byte, size)
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}
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}
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// The following parameters controls the size of buffer pools.
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// There are numPools pools. Starting from 2k size, the size of each pool is sizeMulti of the previous one.
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// Package buf is guaranteed to not use buffers larger than the largest pool.
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// Other packets may use larger buffers.
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const (
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numPools = 4
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sizeMulti = 4
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)
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var (
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pool [numPools]sync.Pool
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poolSize [numPools]int32
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)
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func init() {
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size := int32(2048)
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for i := 0; i < numPools; i++ {
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pool[i] = sync.Pool{
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New: createAllocFunc(size),
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}
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poolSize[i] = size
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size *= sizeMulti
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}
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}
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// Alloc returns a byte slice with at least the given size. Minimum size of returned slice is 2048.
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func Alloc(size int32) []byte {
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for idx, ps := range poolSize {
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if size <= ps {
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return pool[idx].Get().([]byte)
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}
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}
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return make([]byte, size)
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}
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// Free puts a byte slice into the internal pool.
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func Free(b []byte) {
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size := int32(cap(b))
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b = b[0:cap(b)]
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for i := numPools - 1; i >= 0; i-- {
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if size >= poolSize[i] {
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pool[i].Put(b) // nolint: megacheck
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return
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}
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}
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}
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