[go-nuts] Any good idea to stop the goroutine as soon as possible?

[E Z]

I'm using golang to implement a task schedule and process system.

I found that golang can't stop the goroutine externally,  we must wait for 
the goroutine to end itself. I can stop a goroutine through a channel, 
however, the only time to check the value of the channel is when the select 
is called, and this must wait until the execution of the business function 
ends, which can take a long time.

for example:

ticker := time.NewTicker(task.period)
defer ticker.Stop()
for {
    select {
        case <-task.channel:
            return
        case <-ticker.C:
            _ =  task.task.Run(task.logger)
     }
}

The above code is executing in a goroutine, if I want to cancel this 
goroutine, I can send a signal to task.channel, but the signal only can be 
retrieved after the task.task.Run is finished, it may be a long time, such 
as 5 mins. 

Is there any good idea to cancel the goroutine like the above code as soon 
as possible?

Thanks,
Ethan

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