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v/vlib/sync/channel_3_test.v

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fn do_rec(ch chan int, resch chan i64) {
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mut sum := i64(0)
for _ in 0 .. 2000 {
sum += <-ch
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}
println(sum)
resch <- sum
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}
fn do_send(ch chan int) {
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for i in 0 .. 2000 {
ch <- i
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}
}
fn test_channel_multi_unbuffered() {
ch := chan int{}
resch := chan i64{}
go do_rec(ch, resch)
go do_rec(ch, resch)
go do_rec(ch, resch)
go do_rec(ch, resch)
go do_send(ch)
go do_send(ch)
go do_send(ch)
go do_send(ch)
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mut sum := i64(0)
for _ in 0 .. 4 {
sum += <-resch
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}
assert sum == i64(4) * 2000 * (2000 - 1) / 2
}