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v/vlib/sync/channel_push_or_1_test.v

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const n = 1000
const c = 100
fn f(ch chan int) {
for _ in 0 .. n {
_ := <-ch
}
ch.close()
}
fn test_push_or_unbuffered() {
ch := chan int{}
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spawn f(ch)
mut j := 0
for {
ch <- j or { break }
j++
}
assert j == n
}
fn test_push_or_buffered() {
ch := chan int{cap: c}
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spawn f(ch)
mut j := 0
for {
ch <- j or { break }
j++
}
// we don't know how many elements are in the buffer when the channel
// is closed, so check j against an interval
assert j >= n
assert j <= n + c
}
fn g(ch chan int, res chan int) {
mut j := 0
for {
ch <- j or { break }
j++
}
println('done $j')
res <- j
}
fn test_many_senders() {
ch := chan int{}
res := chan int{}
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spawn g(ch, res)
spawn g(ch, res)
spawn g(ch, res)
mut k := 0
for _ in 0 .. 3 * n {
k = <-ch
}
ch.close()
mut sum := <-res
sum += <-res
sum += <-res
assert sum == 3 * n
}