我怎么知道一个门厅是否完成，没有阻塞？(How do I find out if a goroutine is done, without blocking?)

我怎么知道一个门厅是否完成，没有阻塞？(How do I find out if a goroutine is done, without blocking?)

到目前为止，我见过的所有例子都涉及阻塞来获取结果（通过<-chan运算符）。

我目前的做法涉及将指针传递给结构：

type goresult struct { result resultType; finished bool; }

该门厅在完成时写入。 然后，只要方便，就可以finished检查。 你有更好的选择吗？

我真正想要的是一个Qt风格的信号插槽系统。 我有预感，解决方案看起来几乎微不足道（有很多未知的潜力），但我还不熟悉这门语言。

All the examples I've seen so far involve blocking to get the result (via the <-chan operator).

My current approach involves passing a pointer to a struct:

type goresult struct { result resultType; finished bool; }

which the goroutine writes upon completion. Then it's a simple matter of checking finished whenever convenient. Do you have better alternatives?

What I'm really aiming for is a Qt-style signal-slot system. I have a hunch the solution will look almost trivial (chans have lots of unexplored potential), but I'm not yet familiar enough with the language to figure it out.

最满意答案

你可以使用“逗号，好的”模式（参见他们的“ 有效的去 ”页面）：

foo := <- ch; // This blocks. foo, ok := <- ch; // This returns immediately.

You can use the "comma, ok" pattern (see their page on "effective go"):

foo := <- ch; // This blocks. foo, ok := <- ch; // This returns immediately.