提议：新增 ReleaseWaitAllWorkersExit()，用于等待所有worker都被释放后再返回

[cuishuang]

由于ants中var defaultAntsPool, _ = NewPool(DefaultAntsPoolSize)，会在使用到该库的项目初始化时，先于项目的main.go执行，从而会多出一个协程；

很多项目单测中集成了go.uber.org/goleak，用于检测goroutine泄露，从而会导致测试失败，如下图：

查看ants代码，发现有一个Release()方法，可以释放掉worker，但释放需要一定时间，只能休眠一个足够长的时间(经验值是1s左右)

建议新增一个 ReleaseWaitAllWorkersExit()方法，调用后，确保所有worker都释放后才返回

另外几个可能相关的issue：

https://github.com/panjf2000/ants/issues/212

https://github.com/panjf2000/ants/issues/225

---

related pr：https://github.com/panjf2000/ants/pull/245

[panjf2000]

现在已经有了：https://pkg.go.dev/github.com/panjf2000/ants/v2#Pool.ReleaseTimeout

[cuishuang]

现在已经有了：https://pkg.go.dev/github.com/panjf2000/ants/v2#Pool.ReleaseTimeout

恩，ReleaseWaitAllWorkersExit()就是参照的这个ReleaseTimeout；但ReleaseTimeout有两个问题：1是依然需要传入一个timeout的入参，无法做到准确的结束所有worker后就返回；2是没有在ants.go里封装一个可对外暴露的方法，defaultAntsPool无法直接调用

[lifei6671]

现在已经有了：https://pkg.go.dev/github.com/panjf2000/ants/v2#Pool.ReleaseTimeout

确实有这个需求，需要等待所有正在执行的协程都退出了，主进程才退出，目前只能猜测可能的退出时间.

[HaiboLee]

需求+1 比如需要等到所有协程执行结果后再往下执行 最好设置个通道 等所有协程执行结束后通知

[cuishuang]

需求+1 比如需要等到所有协程执行结果后再往下执行 最好设置个通道 等所有协程执行结束后通知

我都忘了咋回事了(捂脸)

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