mirror of
https://gitee.com/johng/gf
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45 lines
1.0 KiB
Go
45 lines
1.0 KiB
Go
// Copyright 2018 gf Author(https://github.com/gogf/gf). All Rights Reserved.
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//
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// This Source Code Form is subject to the terms of the MIT License.
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// If a copy of the MIT was not distributed with this file,
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// You can obtain one at https://github.com/gogf/gf.
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package grand
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import (
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"crypto/rand"
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)
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const (
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// Buffer size for uint32 random number.
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gBUFFER_SIZE = 10000
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)
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var (
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// bufferChan is the buffer for random bytes,
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// every item storing 4 bytes.
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bufferChan = make(chan []byte, gBUFFER_SIZE)
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)
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func init() {
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go asyncProducingRandomBufferBytesLoop()
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}
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// asyncProducingRandomBufferBytes is a named goroutine, which uses a asynchronous goroutine
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// to produce the random bytes, and a buffer chan to store the random bytes.
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// So it has high performance to generate random numbers.
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func asyncProducingRandomBufferBytesLoop() {
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buffer := make([]byte, 1024)
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for {
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if n, err := rand.Read(buffer); err != nil {
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panic(err)
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} else {
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for i := 0; i < n-4; i += 4 {
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b := make([]byte, 4)
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copy(b, buffer[i:i+4])
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bufferChan <- b
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}
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}
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}
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}
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