hi. thanks for your answers. i understand that the channel has to be
closed. what i do not understand is the error 'write after close'
if w (called from w0) was executed in another thread, than i had to wait
for the end of w by some mean of synchronization, before i close the
channel. but if w0 and w are executed in same thread they are executed
sequentielly inside the thread and close inside w0 is called when w has
returned. so it should be fine. in main then for v := range c { } would
end.
andreas graeper schrieb am Montag, 8. Juni 2026 um 11:42:37 UTC+2:
> hi. i try to walk through a tree putting elems into channel
> w(t,c) { if t!=nil { w(t.left,c) ; c<-t.elem ; w(t.right,c) }}
> w0(t,c) { w(t,c); close(c); }
> main(){
> go w0(t,c)
> for e := range c {}
> }
> if i drop 'close(c)' i get 'all threads dead' , otherwise 'write after
> close'
> it feels as if w is send to background too and i have to sync to the end
> of w before i close the channel ?
> thanks in advance, andi
>
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