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v/vlib/sync/channel_fill_test.v

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import sync
const (
queue_len = 1000
queue_fill = 763
)
fn do_send(ch chan int, mut fin sync.Semaphore) {
for i in 0 .. queue_fill {
ch <- i
}
fin.post()
}
fn test_channel_len_cap() {
ch := chan int{cap: queue_len}
mut sem := sync.new_semaphore()
go do_send(ch, mut sem)
sem.wait()
assert ch.cap == queue_len
assert ch.len == queue_fill
}