golang 协程池 动态扩缩容

参考 github.com/panjf2000/ants

package main

import (
	"fmt"
	"sync"
	"sync/atomic"
	"time"

	_ "github.com/panjf2000/ants"
)

type pool struct {
   
   
	// 协程池最大容量
	cap int32
	// 当前运行的协程个数
	run   int32
	block bool

	// 空闲goroutinue
	idleWorkers []*worker
	// 最大空闲时间，超过就挥手
	idleTimeoutSec uint32

	lock  sync.Mutex
	cond  *sync.Cond
	close chan struct{
   
   }
	wg    sync.WaitGroup
}

func NewPool(cap int32) *pool {
   
   
	c := &pool{
   
   
		cap: cap,
		//idleWorkers: make([]*worker, 0, cap),
		close: make(chan struct{
   
   }),
	}
	c.cond = sync.NewCond(&c.lock)
	go c.checkIdleWork()
	return c
}

func (p *pool) checkIdleWork() {
   
   
	for {
   
   
		select {
   
   
		case <-time.After(time.Second * 5):
			{
   
   
				p.lock.Lock()
				defer p.lock.Unlock()

				var i = 0
				for ; i < len(p.idleWorkers) &&
					uint32(time.Now()