79 lines
1.8 KiB
V
79 lines
1.8 KiB
V
// vtest flaky: true
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// vtest retry: 15
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// This test case runs concurrent 3 instances of `do_select` that
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// communicate with 6 other threads doing send and receive operations.
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// There are buffered and unbuffered channels - handled by one or two
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// concurrend threads on the other side
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fn do_select(ch1 chan int, ch2 chan int, chf1 chan f64, chf2 chan f64, sumch1 chan i64, sumch2 chan i64) {
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mut sum1 := i64(0)
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mut sum2 := i64(0)
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f1 := 17.0
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f2 := 7.0
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for _ in 0 .. 20000 + chf1.cap / 3 {
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select {
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chf1 <- f1 {}
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i := <-ch1 {
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sum1 += i
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}
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j := <-ch2 {
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sum2 += j
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}
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chf2 <- f2 {}
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}
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}
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sumch1 <- sum1
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sumch2 <- sum2
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}
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fn do_send_int(ch chan int, factor int) {
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for i in 0 .. 10000 {
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ch <- (i * factor)
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}
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}
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fn do_rec_f64(ch chan f64, sumch chan f64) {
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mut sum := 0.0
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for _ in 0 .. 10000 {
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sum += <-ch
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}
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sumch <- sum
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}
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fn test_select() {
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ch1 := chan int{cap: 3}
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ch2 := chan int{}
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// buffer length of chf1 mus be mutiple of 3 (# select threads)
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chf1 := chan f64{cap: 30}
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chf2 := chan f64{}
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chsum1 := chan i64{}
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chsum2 := chan i64{}
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chsumf1 := chan f64{}
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chsumf2 := chan f64{}
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go do_send_int(ch1, 3)
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go do_select(ch1, ch2, chf1, chf2, chsum1, chsum2)
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go do_rec_f64(chf1, chsumf1)
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go do_rec_f64(chf2, chsumf2)
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go do_rec_f64(chf2, chsumf2)
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go do_select(ch1, ch2, chf1, chf2, chsum1, chsum2)
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go do_send_int(ch2, 7)
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go do_send_int(ch2, 17)
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go do_select(ch1, ch2, chf1, chf2, chsum1, chsum2)
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sum1 := <-chsum1 + <-chsum1 + <-chsum1
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sum2 := <-chsum2 + <-chsum2 + <-chsum2
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mut sumf1 := <-chsumf1
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// empty channel buffer
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for _ in 0 .. chf1.cap {
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sumf1 += <-chf1
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}
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sumf2 := <-chsumf2 + <-chsumf2
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// Use Gauß' formula
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expected_sum := i64(10000) * (10000 - 1) / 2
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assert sum1 == 3 * expected_sum
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assert sum2 == (7 + 17) * expected_sum
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assert sumf1 == 17.0 * f64(10000 + chf1.cap)
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assert sumf2 == 7.0 * 20000
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}
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