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v/vlib/sync/many_times_test.v

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import sync
struct Counter {
pub mut:
i int
}
fn (mut c Counter) add(i int) {
c.i = c.i + i
}
fn run(mut m sync.ManyTimes, mut co Counter, c chan bool) {
m.do(fn [mut co] () {
co.add(5)
})
c <- true
}
fn test_many_times_once() {
mut co := &Counter{}
mut m := sync.new_many_times(1)
c := chan bool{}
n := 10
// It is executed 10 times, but only once actually.
for i := 0; i < n; i++ {
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spawn run(mut m, mut co, c)
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}
for i := 0; i < n; i++ {
<-c
}
assert co.i == 5
}
fn test_many_times_fifth() {
mut co := &Counter{}
mut m := sync.new_many_times(5)
c := chan bool{}
n := 10
// It is executed 10 times, but only 5 times actually.
for i := 0; i < n; i++ {
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spawn run(mut m, mut co, c)
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}
for i := 0; i < n; i++ {
<-c
}
assert co.i == 25
}