Timeouts.md

# Timeouts and Deadlines

To abandon synchronous calls that run too long, use the select statement with time.After:
```
import "time"

c := make(chan error, 1)
go func() { c <- client.Call("Service.Method", args, &reply) } ()
select {
  case err := <-c:
    // use err and reply
  case <-time.After(timeoutNanoseconds):
    // call timed out
}
```

Note that the channel ` c ` has a buffer size of 1.  If it were an unbuffered channel and the client.Call method took more than ` timeoutNanoseconds `, the channel send would block forever and the goroutine would never be destroyed.

## References

time.After: http://golang.org/pkg/time/#After

select: http://golang.org/doc/go_spec.html#Select_statements

blog post: http://blog.golang.org/2010/09/go-concurrency-patterns-timing-out-and.html